Anyone want to cast their eye over this Local Oscillator board before I send off for a board or 5?
Crystek VCO locked to a 10/20/40 MHz OCXO via a 4513 synth chip .. to generate a low spurii/low phase noise 2256 MHz or whatever signal (depending on choice of VCO)
The 10/20/40 MHz OCXO can be locked to an external 10 MHz reference by an ADF4001, and a few logic gates to decide if the 10MHz signal is present ...
A PGA105+ lifts and buffers the output, with a pad in front to allow for setting of output level.
I've made a half-hearted attempt at isolating the various power feeds to the ADF chips with 100nH chokes and pairs of decoupling caps etc, 4 layer board with a RF ground layer immediately beneath the top layer, power and control signals run around on the lower two layers.
LEDs indicate lock of each VCO stage and the presence of 10MHz ... anything else needed? I have a spare pin on the ATTINY45, I could load an alternate set of frequency control registers maybe?
The OCXO can draw 600mA at warmup, 200mA running, so the 12V->5V reg is going to take a bit of a pasting, but I really don't fancy doing a buck converter for obvious reasons.
I'll put the Eagle files up on GitHUB if anyone is interested. I am trying to remember if the 148x111 Eisch tinplate boxes are external or internal size ..
If anyone spots any obvious errors, or has some design note ideas let me know ...
-- Best regards,
Robin Szemeti, G1YFG
-- Robin Szemeti - G1YFG
|
|
And the GitHub repository, if anyone cares.
toggle quoted messageShow quoted text
Anyone want to cast their eye over this Local Oscillator board before I send off for a board or 5?
Crystek VCO locked to a 10/20/40 MHz OCXO via a 4513 synth chip .. to generate a low spurii/low phase noise 2256 MHz or whatever signal (depending on choice of VCO)
The 10/20/40 MHz OCXO can be locked to an external 10 MHz reference by an ADF4001, and a few logic gates to decide if the 10MHz signal is present ...
A PGA105+ lifts and buffers the output, with a pad in front to allow for setting of output level.
I've made a half-hearted attempt at isolating the various power feeds to the ADF chips with 100nH chokes and pairs of decoupling caps etc, 4 layer board with a RF ground layer immediately beneath the top layer, power and control signals run around on the lower two layers.
LEDs indicate lock of each VCO stage and the presence of 10MHz ... anything else needed? I have a spare pin on the ATTINY45, I could load an alternate set of frequency control registers maybe?
The OCXO can draw 600mA at warmup, 200mA running, so the 12V->5V reg is going to take a bit of a pasting, but I really don't fancy doing a buck converter for obvious reasons.
I'll put the Eagle files up on GitHUB if anyone is interested. I am trying to remember if the 148x111 Eisch tinplate boxes are external or internal size ..
If anyone spots any obvious errors, or has some design note ideas let me know ...
-- Best regards,
Robin Szemeti, G1YFG
-- Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
|
|

Andy G4JNT
I'd be happier with a few ohms or tens of ohms in the feed to the PGA105 output buffer. Never trusted those devices running from a zero source impedance, even if the data sheets says you can.
toggle quoted messageShow quoted text
Anyone want to cast their eye over this Local Oscillator board before I send off for a board or 5?
Crystek VCO locked to a 10/20/40 MHz OCXO via a 4513 synth chip .. to generate a low spurii/low phase noise 2256 MHz or whatever signal (depending on choice of VCO)
The 10/20/40 MHz OCXO can be locked to an external 10 MHz reference by an ADF4001, and a few logic gates to decide if the 10MHz signal is present ...
A PGA105+ lifts and buffers the output, with a pad in front to allow for setting of output level.
I've made a half-hearted attempt at isolating the various power feeds to the ADF chips with 100nH chokes and pairs of decoupling caps etc, 4 layer board with a RF ground layer immediately beneath the top layer, power and control signals run around on the lower two layers.
LEDs indicate lock of each VCO stage and the presence of 10MHz ... anything else needed? I have a spare pin on the ATTINY45, I could load an alternate set of frequency control registers maybe?
The OCXO can draw 600mA at warmup, 200mA running, so the 12V->5V reg is going to take a bit of a pasting, but I really don't fancy doing a buck converter for obvious reasons.
I'll put the Eagle files up on GitHUB if anyone is interested. I am trying to remember if the 148x111 Eisch tinplate boxes are external or internal size ..
If anyone spots any obvious errors, or has some design note ideas let me know ...
-- Best regards,
Robin Szemeti, G1YFG
-- Robin Szemeti - G1YFG
|
|
Hi Robin, Eisch sizes are external. you need to
subtract 2mm to be safe and don't forget the flange on two oposite corners.
Check your size is in the cataloge because I dont remember seeing 148 x 111mm ,
but that maybe because its one I have never been asked for. My printed cat is
Kat09 which may account for it. However the last one I downloaded was May 2017
and that only goes to 148 x 75mm. This seems to be the last for download
too.
Best Wishes
Alan
G3NYK
toggle quoted messageShow quoted text
----- Original Message -----
Sent: Friday, November 25, 2022 5:36
PM
Subject: [UKMicrowaves] Anyone want to
cast their eye over ...
Anyone want to cast their eye over this Local Oscillator board before I
send off for a board or 5?
Crystek VCO locked to a 10/20/40 MHz OCXO via a 4513 synth chip ..
to generate a low spurii/low phase noise 2256 MHz or whatever signal
(depending on choice of VCO)
The 10/20/40 MHz OCXO can be locked to an external 10 MHz reference by an
ADF4001, and a few logic gates to decide if the 10MHz signal is present ...
A PGA105+ lifts and buffers the output, with a pad in front to
allow for setting of output level.
I've made a half-hearted attempt at isolating the various power feeds to
the ADF chips with 100nH chokes and pairs of decoupling caps etc, 4 layer
board with a RF ground layer immediately beneath the top layer, power
and control signals run around on the lower two layers.
LEDs indicate lock of each VCO stage and the presence of 10MHz ...
anything else needed? I have a spare pin on the ATTINY45, I could load
an alternate set of frequency control registers maybe?
The OCXO can draw 600mA at warmup, 200mA running, so the 12V->5V reg
is going to take a bit of a pasting, but I really don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up on GitHUB if anyone is interested. I am
trying to remember if the 148x111 Eisch tinplate boxes are external or
internal size ..
If anyone spots any obvious errors, or has some design note ideas let me
know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
|
|
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the size down ... The current Eisch catalog is 2017
It shows the 148x111 box ... let me know if you are likely to place an order soon, or I'll just order direct, as I need 25 Anglian boxes as well.
toggle quoted messageShow quoted text
Hi Robin, Eisch sizes are external. you need to
subtract 2mm to be safe and don't forget the flange on two oposite corners.
Check your size is in the cataloge because I dont remember seeing 148 x 111mm ,
but that maybe because its one I have never been asked for. My printed cat is
Kat09 which may account for it. However the last one I downloaded was May 2017
and that only goes to 148 x 75mm. This seems to be the last for download
too.
Best Wishes
Alan
G3NYK
----- Original Message -----
Sent: Friday, November 25, 2022 5:36
PM
Subject: [UKMicrowaves] Anyone want to
cast their eye over ...
Anyone want to cast their eye over this Local Oscillator board before I
send off for a board or 5?
Crystek VCO locked to a 10/20/40 MHz OCXO via a 4513 synth chip ..
to generate a low spurii/low phase noise 2256 MHz or whatever signal
(depending on choice of VCO)
The 10/20/40 MHz OCXO can be locked to an external 10 MHz reference by an
ADF4001, and a few logic gates to decide if the 10MHz signal is present ...
A PGA105+ lifts and buffers the output, with a pad in front to
allow for setting of output level.
I've made a half-hearted attempt at isolating the various power feeds to
the ADF chips with 100nH chokes and pairs of decoupling caps etc, 4 layer
board with a RF ground layer immediately beneath the top layer, power
and control signals run around on the lower two layers.
LEDs indicate lock of each VCO stage and the presence of 10MHz ...
anything else needed? I have a spare pin on the ATTINY45, I could load
an alternate set of frequency control registers maybe?
The OCXO can draw 600mA at warmup, 200mA running, so the 12V->5V reg
is going to take a bit of a pasting, but I really don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up on GitHUB if anyone is interested. I am
trying to remember if the 148x111 Eisch tinplate boxes are external or
internal size ..
If anyone spots any obvious errors, or has some design note ideas let me
know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
|
|
Interestingly, I used the ADF4153 together with a HMC433 to repair a YIG PLL in my Systron Donner generator. 73's Maarten PA0MHE
|
|

Denis Stanton G0OLX
Rodin Could you order a couple more boxes for the Anglian for me please, will sort out payment and delivery when they arrive!!!! Denis
toggle quoted messageShow quoted text
On 25 Nov 2022, at 19:43, Maarten PA0MHE <maarten.heuvelman@...> wrote:
Interestingly, I used the ADF4153 together with a HMC433 to repair a YIG PLL in my Systron Donner generator. 73's Maarten PA0MHE
|
|
I'm beginning to doubt my own sanity ... why I am I bleating on about a 148 box when the board is very clearly 111x55? I think I need to go for a bit of a walk ...
toggle quoted messageShow quoted text
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the size down ... The current Eisch catalog is 2017
It shows the 148x111 box ... let me know if you are likely to place an order soon, or I'll just order direct, as I need 25 Anglian boxes as well.
Hi Robin, Eisch sizes are external. you need to
subtract 2mm to be safe and don't forget the flange on two oposite corners.
Check your size is in the cataloge because I dont remember seeing 148 x 111mm ,
but that maybe because its one I have never been asked for. My printed cat is
Kat09 which may account for it. However the last one I downloaded was May 2017
and that only goes to 148 x 75mm. This seems to be the last for download
too.
Best Wishes
Alan
G3NYK
----- Original Message -----
Sent: Friday, November 25, 2022 5:36
PM
Subject: [UKMicrowaves] Anyone want to
cast their eye over ...
Anyone want to cast their eye over this Local Oscillator board before I
send off for a board or 5?
Crystek VCO locked to a 10/20/40 MHz OCXO via a 4513 synth chip ..
to generate a low spurii/low phase noise 2256 MHz or whatever signal
(depending on choice of VCO)
The 10/20/40 MHz OCXO can be locked to an external 10 MHz reference by an
ADF4001, and a few logic gates to decide if the 10MHz signal is present ...
A PGA105+ lifts and buffers the output, with a pad in front to
allow for setting of output level.
I've made a half-hearted attempt at isolating the various power feeds to
the ADF chips with 100nH chokes and pairs of decoupling caps etc, 4 layer
board with a RF ground layer immediately beneath the top layer, power
and control signals run around on the lower two layers.
LEDs indicate lock of each VCO stage and the presence of 10MHz ...
anything else needed? I have a spare pin on the ATTINY45, I could load
an alternate set of frequency control registers maybe?
The OCXO can draw 600mA at warmup, 200mA running, so the 12V->5V reg
is going to take a bit of a pasting, but I really don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up on GitHUB if anyone is interested. I am
trying to remember if the 148x111 Eisch tinplate boxes are external or
internal size ..
If anyone spots any obvious errors, or has some design note ideas let me
know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
|
|
It is Alan Melia placing the order for boxen.
I'm going to try and mount the passives on 30 Anglian boards this week ... then at least I will think I have achieved *something* ... although I might have said this before and failed, maybe this time will be different?
toggle quoted messageShow quoted text
Rodin Could you order a couple more boxes for the Anglian for me please, will sort out payment and delivery when they arrive!!!! Denis G0OLX Interestingly, I used the ADF4153 together with a HMC433 to repair a YIG PLL in my Systron Donner generator. 73's Maarten PA0MHE
-- Robin Szemeti - G1YFG
|
|

Denis Stanton G0OLX
Robin Sorry Alan If you have a couple of Anglian boxes going spare, if not could your please order a pair for me. Many thanks Denis G0OLX PS
I could pick them up at the next Saturday morning breakfast meeting to save the postage !!!!
toggle quoted messageShow quoted text
On 25 Nov 2022, at 20:11, Robin Szemeti - G1YFG via groups.io <robin@...> wrote:
I'm beginning to doubt my own sanity ... why I am I bleating on about a 148 box when the board is very clearly 111x55? I think I need to go for a bit of a walk ...
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the size down ... The current Eisch catalog is 2017
It shows the 148x111 box ... let me know if you are likely to place an order soon, or I'll just order direct, as I need 25 Anglian boxes as well.
Hi Robin, Eisch sizes are external. you need to
subtract 2mm to be safe and don't forget the flange on two oposite corners.
Check your size is in the cataloge because I dont remember seeing 148 x 111mm ,
but that maybe because its one I have never been asked for. My printed cat is
Kat09 which may account for it. However the last one I downloaded was May 2017
and that only goes to 148 x 75mm. This seems to be the last for download
too.
Best Wishes
Alan
G3NYK
----- Original Message -----
Sent: Friday, November 25, 2022 5:36
PM
Subject: [UKMicrowaves] Anyone want to
cast their eye over ...
Anyone want to cast their eye over this Local Oscillator board before I
send off for a board or 5?
Crystek VCO locked to a 10/20/40 MHz OCXO via a 4513 synth chip ..
to generate a low spurii/low phase noise 2256 MHz or whatever signal
(depending on choice of VCO)
The 10/20/40 MHz OCXO can be locked to an external 10 MHz reference by an
ADF4001, and a few logic gates to decide if the 10MHz signal is present ...
A PGA105+ lifts and buffers the output, with a pad in front to
allow for setting of output level.
I've made a half-hearted attempt at isolating the various power feeds to
the ADF chips with 100nH chokes and pairs of decoupling caps etc, 4 layer
board with a RF ground layer immediately beneath the top layer, power
and control signals run around on the lower two layers.
LEDs indicate lock of each VCO stage and the presence of 10MHz ...
anything else needed? I have a spare pin on the ATTINY45, I could load
an alternate set of frequency control registers maybe?
The OCXO can draw 600mA at warmup, 200mA running, so the 12V->5V reg
is going to take a bit of a pasting, but I really don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up on GitHUB if anyone is interested. I am
trying to remember if the 148x111 Eisch tinplate boxes are external or
internal size ..
If anyone spots any obvious errors, or has some design note ideas let me
know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
|
|
Denis, If Alan can't help I have a couple that I don't need immediately (but will in due course). I can bring them to breakfast tomorrow.
If anyone is looking for Iceni 70cm transverter kits, I have some parts including PCBs, helical filters, mixers and semiconductors (MMICs, bipolars). I have a few 101MHz crystals. Probably no boxes, although the board fits nicely into one of the Hammond cases. Enquiries off reflector, please.
73 de Sam, G4DDK
Sent tomorrow from my iPad 10
toggle quoted messageShow quoted text
On 25 Nov 2022, at 20:18, Denis Stanton G0OLX <Stantondenis@...> wrote:
Robin Sorry Alan If you have a couple of Anglian boxes going spare, if not could your please order a pair for me. Many thanks Denis G0OLX PS
I could pick them up at the next Saturday morning breakfast meeting to save the postage !!!! On 25 Nov 2022, at 20:11, Robin Szemeti - G1YFG via groups.io <robin@...> wrote:
I'm beginning to doubt my own sanity ... why I am I bleating on about a 148 box when the board is very clearly 111x55? I think I need to go for a bit of a walk ...
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the size down ... The current Eisch catalog is 2017
It shows the 148x111 box ... let me know if you are likely to place an order soon, or I'll just order direct, as I need 25 Anglian boxes as well.
Hi Robin, Eisch sizes are external. you need to
subtract 2mm to be safe and don't forget the flange on two oposite corners.
Check your size is in the cataloge because I dont remember seeing 148 x 111mm ,
but that maybe because its one I have never been asked for. My printed cat is
Kat09 which may account for it. However the last one I downloaded was May 2017
and that only goes to 148 x 75mm. This seems to be the last for download
too.
Best Wishes
Alan
G3NYK
----- Original Message -----
Sent: Friday, November 25, 2022 5:36
PM
Subject: [UKMicrowaves] Anyone want to
cast their eye over ...
Anyone want to cast their eye over this Local Oscillator board before I
send off for a board or 5?
Crystek VCO locked to a 10/20/40 MHz OCXO via a 4513 synth chip ..
to generate a low spurii/low phase noise 2256 MHz or whatever signal
(depending on choice of VCO)
The 10/20/40 MHz OCXO can be locked to an external 10 MHz reference by an
ADF4001, and a few logic gates to decide if the 10MHz signal is present ...
A PGA105+ lifts and buffers the output, with a pad in front to
allow for setting of output level.
I've made a half-hearted attempt at isolating the various power feeds to
the ADF chips with 100nH chokes and pairs of decoupling caps etc, 4 layer
board with a RF ground layer immediately beneath the top layer, power
and control signals run around on the lower two layers.
LEDs indicate lock of each VCO stage and the presence of 10MHz ...
anything else needed? I have a spare pin on the ATTINY45, I could load
an alternate set of frequency control registers maybe?
The OCXO can draw 600mA at warmup, 200mA running, so the 12V->5V reg
is going to take a bit of a pasting, but I really don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up on GitHUB if anyone is interested. I am
trying to remember if the 148x111 Eisch tinplate boxes are external or
internal size ..
If anyone spots any obvious errors, or has some design note ideas let me
know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
|
|
Bit of a clean up ... Andy's suggestion incorporated, GitHub updated ...
toggle quoted messageShow quoted text
Denis, If Alan can't help I have a couple that I don't need immediately (but will in due course). I can bring them to breakfast tomorrow.
If anyone is looking for Iceni 70cm transverter kits, I have some parts including PCBs, helical filters, mixers and semiconductors (MMICs, bipolars). I have a few 101MHz crystals. Probably no boxes, although the board fits nicely into one of the Hammond cases. Enquiries off reflector, please.
73 de Sam, G4DDK
Sent tomorrow from my iPad 10 Robin Sorry Alan If you have a couple of Anglian boxes going spare, if not could your please order a pair for me. Many thanks Denis G0OLX PS
I could pick them up at the next Saturday morning breakfast meeting to save the postage !!!! I'm beginning to doubt my own sanity ... why I am I bleating on about a 148 box when the board is very clearly 111x55? I think I need to go for a bit of a walk ...
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the size down ... The current Eisch catalog is 2017
It shows the 148x111 box ... let me know if you are likely to place an order soon, or I'll just order direct, as I need 25 Anglian boxes as well.
Hi Robin, Eisch sizes are external. you need to
subtract 2mm to be safe and don't forget the flange on two oposite corners.
Check your size is in the cataloge because I dont remember seeing 148 x 111mm ,
but that maybe because its one I have never been asked for. My printed cat is
Kat09 which may account for it. However the last one I downloaded was May 2017
and that only goes to 148 x 75mm. This seems to be the last for download
too.
Best Wishes
Alan
G3NYK
----- Original Message -----
Sent: Friday, November 25, 2022 5:36
PM
Subject: [UKMicrowaves] Anyone want to
cast their eye over ...
Anyone want to cast their eye over this Local Oscillator board before I
send off for a board or 5?
Crystek VCO locked to a 10/20/40 MHz OCXO via a 4513 synth chip ..
to generate a low spurii/low phase noise 2256 MHz or whatever signal
(depending on choice of VCO)
The 10/20/40 MHz OCXO can be locked to an external 10 MHz reference by an
ADF4001, and a few logic gates to decide if the 10MHz signal is present ...
A PGA105+ lifts and buffers the output, with a pad in front to
allow for setting of output level.
I've made a half-hearted attempt at isolating the various power feeds to
the ADF chips with 100nH chokes and pairs of decoupling caps etc, 4 layer
board with a RF ground layer immediately beneath the top layer, power
and control signals run around on the lower two layers.
LEDs indicate lock of each VCO stage and the presence of 10MHz ...
anything else needed? I have a spare pin on the ATTINY45, I could load
an alternate set of frequency control registers maybe?
The OCXO can draw 600mA at warmup, 200mA running, so the 12V->5V reg
is going to take a bit of a pasting, but I really don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up on GitHUB if anyone is interested. I am
trying to remember if the 148x111 Eisch tinplate boxes are external or
internal size ..
If anyone spots any obvious errors, or has some design note ideas let me
know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
-- Robin Szemeti - G1YFG
|
|
Hi Robin
If I am reading it correctly schematic in your original post and
the layout don't seem to match up with regards to component labels
The 5V reg is IC9? but looks like its labelled IC6 on the
layout?
Regardless, if the regulator is being stressed, it may be
better to have its tab right next to the board edge. That way,
when the board is soldered into the case, the case will be able to
provide a better heatsink.
On several units I have, including a 3cm DB6NT G2 transverter, I
have soldered copper tabs to the outside of the tinplate box
adjacent to the regulators and taken them straight to the side of
the enclosure (die cast box). Tinplate boxes are not great
heatsinks either, especially inside a sealed box.
The internals of the G2 run a lot cooler because of this.
Mark GM4ISM
On 25/11/2022 23:20, Robin Szemeti -
G1YFG via groups.io wrote:
Bit of a clean up ... Andy's suggestion incorporated,
GitHub updated ...
Denis,
If Alan can't help I have a couple that I don't need
immediately (but will in due course).
I can bring them to breakfast tomorrow.
If anyone is looking for Iceni 70cm transverter kits, I
have some parts including PCBs, helical filters, mixers
and semiconductors (MMICs, bipolars). I have a few 101MHz
crystals.
Probably no boxes, although the board fits nicely into
one of the Hammond cases.
Enquiries off reflector, please.
73 de Sam, G4DDK
Sent tomorrow from my iPad 10
Robin
Sorry
Alan
If you have a couple of Anglian boxes going
spare, if not could your please order a pair for me.
Many thanks
Denis
G0OLX
PS
I could pick them up at the next Saturday morning
breakfast meeting to save the postage !!!!
I'm beginning to doubt my own
sanity ... why I am I bleating on about a 148
box when the board is very clearly 111x55? I
think I need to go for a bit of a walk ...
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the
size down ... The current Eisch catalog
is 2017
It shows the 148x111 box ... let me
know if you are likely to place an order
soon, or I'll just order direct, as I
need 25 Anglian boxes as well.
Hi
Robin, Eisch sizes are external.
you need to subtract 2mm to be
safe and don't forget the flange
on two oposite corners. Check your
size is in the cataloge because I
dont remember seeing 148 x 111mm ,
but that maybe because its one I
have never been asked for. My
printed cat is Kat09 which may
account for it. However the last
one I downloaded was May 2017 and
that only goes to 148 x 75mm. This
seems to be the last for download
too.
Best
Wishes
Alan
G3NYK
-----
Original Message -----
Sent:
Friday, November 25, 2022 5:36 PM
Subject:
[UKMicrowaves] Anyone want to cast
their eye over ...
Anyone want to cast their eye
over this Local Oscillator board
before I send off for a board or
5?
Crystek VCO locked to a
10/20/40 MHz OCXO via a 4513
synth chip .. to generate a low
spurii/low phase noise 2256 MHz
or whatever signal (depending on
choice of VCO)
The 10/20/40 MHz OCXO can be
locked to an external 10 MHz
reference by an ADF4001, and a
few logic gates to decide if the
10MHz signal is present ...
A PGA105+ lifts and buffers
the output, with a pad in front
to allow for setting of output
level.
I've made a half-hearted
attempt at isolating the various
power feeds to the ADF chips
with 100nH chokes and pairs of
decoupling caps etc, 4 layer
board with a RF ground layer
immediately beneath the top
layer, power and control signals
run around on the lower two
layers.
LEDs indicate lock of each
VCO stage and the presence of
10MHz ... anything else needed?
I have a spare pin on the
ATTINY45, I could load an
alternate set of frequency
control registers maybe?
The OCXO can draw 600mA at
warmup, 200mA running, so the
12V->5V reg is going to take
a bit of a pasting, but I really
don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up
on GitHUB if anyone is
interested. I am trying to
remember if the 148x111 Eisch
tinplate boxes are external or
internal size ..
If anyone spots any obvious
errors, or has some design note
ideas let me know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Mark GM4ISM
gm4ism@...
dc2light.co.uk
|
|

Denis Stanton G0OLX
Sam Thanks for the offer of the boxes Still unable to drive after the detached retina I will check if they are urgent otherwise it can wait until the new year Happy Christmas to you Maybe work you off the moon soon Best 73
toggle quoted messageShow quoted text
On 26 Nov 2022, at 00:02, Mark GM4ISM via groups.io <gm4ism@...> wrote:
Hi Robin
If I am reading it correctly schematic in your original post and
the layout don't seem to match up with regards to component labels
The 5V reg is IC9? but looks like its labelled IC6 on the
layout?
Regardless, if the regulator is being stressed, it may be
better to have its tab right next to the board edge. That way,
when the board is soldered into the case, the case will be able to
provide a better heatsink.
On several units I have, including a 3cm DB6NT G2 transverter, I
have soldered copper tabs to the outside of the tinplate box
adjacent to the regulators and taken them straight to the side of
the enclosure (die cast box). Tinplate boxes are not great
heatsinks either, especially inside a sealed box.
The internals of the G2 run a lot cooler because of this.
Mark GM4ISM
On 25/11/2022 23:20, Robin Szemeti -
G1YFG via groups.io wrote:
Bit of a clean up ... Andy's suggestion incorporated,
GitHub updated ...
Denis,
If Alan can't help I have a couple that I don't need
immediately (but will in due course).
I can bring them to breakfast tomorrow.
If anyone is looking for Iceni 70cm transverter kits, I
have some parts including PCBs, helical filters, mixers
and semiconductors (MMICs, bipolars). I have a few 101MHz
crystals.
Probably no boxes, although the board fits nicely into
one of the Hammond cases.
Enquiries off reflector, please.
73 de Sam, G4DDK
Sent tomorrow from my iPad 10
Robin
Sorry
Alan
If you have a couple of Anglian boxes going
spare, if not could your please order a pair for me.
Many thanks
Denis
G0OLX
PS
I could pick them up at the next Saturday morning
breakfast meeting to save the postage !!!!
I'm beginning to doubt my own
sanity ... why I am I bleating on about a 148
box when the board is very clearly 111x55? I
think I need to go for a bit of a walk ...
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the
size down ... The current Eisch catalog
is 2017
It shows the 148x111 box ... let me
know if you are likely to place an order
soon, or I'll just order direct, as I
need 25 Anglian boxes as well.
Hi
Robin, Eisch sizes are external.
you need to subtract 2mm to be
safe and don't forget the flange
on two oposite corners. Check your
size is in the cataloge because I
dont remember seeing 148 x 111mm ,
but that maybe because its one I
have never been asked for. My
printed cat is Kat09 which may
account for it. However the last
one I downloaded was May 2017 and
that only goes to 148 x 75mm. This
seems to be the last for download
too.
Best
Wishes
Alan
G3NYK
-----
Original Message -----
Sent:
Friday, November 25, 2022 5:36 PM
Subject:
[UKMicrowaves] Anyone want to cast
their eye over ...
Anyone want to cast their eye
over this Local Oscillator board
before I send off for a board or
5?
Crystek VCO locked to a
10/20/40 MHz OCXO via a 4513
synth chip .. to generate a low
spurii/low phase noise 2256 MHz
or whatever signal (depending on
choice of VCO)
The 10/20/40 MHz OCXO can be
locked to an external 10 MHz
reference by an ADF4001, and a
few logic gates to decide if the
10MHz signal is present ...
A PGA105+ lifts and buffers
the output, with a pad in front
to allow for setting of output
level.
I've made a half-hearted
attempt at isolating the various
power feeds to the ADF chips
with 100nH chokes and pairs of
decoupling caps etc, 4 layer
board with a RF ground layer
immediately beneath the top
layer, power and control signals
run around on the lower two
layers.
LEDs indicate lock of each
VCO stage and the presence of
10MHz ... anything else needed?
I have a spare pin on the
ATTINY45, I could load an
alternate set of frequency
control registers maybe?
The OCXO can draw 600mA at
warmup, 200mA running, so the
12V->5V reg is going to take
a bit of a pasting, but I really
don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up
on GitHUB if anyone is
interested. I am trying to
remember if the 148x111 Eisch
tinplate boxes are external or
internal size ..
If anyone spots any obvious
errors, or has some design note
ideas let me know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Mark GM4ISM
gm4ism@...
dc2light.co.uk
|
|
Hi Mark,
The "current" version is the one on GitHub, I push changes to there.
I did re-number, the matching schematic and layout below. Point about regulator noted, rotated and re-routed. Hopefully that will be sufficient, I did wonder about providing a separate feed to the 5V reg, from outside th box, which would enable the OCXO to be left powered up, which may be useful ... and a dropper resistor could help spread the heat. The input track is easily accessible, so it won't be an issue I think.
Current (hopefully matching versions) attached.
toggle quoted messageShow quoted text
Hi Robin
If I am reading it correctly schematic in your original post and
the layout don't seem to match up with regards to component labels
The 5V reg is IC9? but looks like its labelled IC6 on the
layout?
Regardless, if the regulator is being stressed, it may be
better to have its tab right next to the board edge. That way,
when the board is soldered into the case, the case will be able to
provide a better heatsink.
On several units I have, including a 3cm DB6NT G2 transverter, I
have soldered copper tabs to the outside of the tinplate box
adjacent to the regulators and taken them straight to the side of
the enclosure (die cast box). Tinplate boxes are not great
heatsinks either, especially inside a sealed box.
The internals of the G2 run a lot cooler because of this.
Mark GM4ISM
On 25/11/2022 23:20, Robin Szemeti -
G1YFG via groups.io wrote:
Bit of a clean up ... Andy's suggestion incorporated,
GitHub updated ...
Denis,
If Alan can't help I have a couple that I don't need
immediately (but will in due course).
I can bring them to breakfast tomorrow.
If anyone is looking for Iceni 70cm transverter kits, I
have some parts including PCBs, helical filters, mixers
and semiconductors (MMICs, bipolars). I have a few 101MHz
crystals.
Probably no boxes, although the board fits nicely into
one of the Hammond cases.
Enquiries off reflector, please.
73 de Sam, G4DDK
Sent tomorrow from my iPad 10
Robin
Sorry
Alan
If you have a couple of Anglian boxes going
spare, if not could your please order a pair for me.
Many thanks
Denis
G0OLX
PS
I could pick them up at the next Saturday morning
breakfast meeting to save the postage !!!!
I'm beginning to doubt my own
sanity ... why I am I bleating on about a 148
box when the board is very clearly 111x55? I
think I need to go for a bit of a walk ...
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the
size down ... The current Eisch catalog
is 2017
It shows the 148x111 box ... let me
know if you are likely to place an order
soon, or I'll just order direct, as I
need 25 Anglian boxes as well.
Hi
Robin, Eisch sizes are external.
you need to subtract 2mm to be
safe and don't forget the flange
on two oposite corners. Check your
size is in the cataloge because I
dont remember seeing 148 x 111mm ,
but that maybe because its one I
have never been asked for. My
printed cat is Kat09 which may
account for it. However the last
one I downloaded was May 2017 and
that only goes to 148 x 75mm. This
seems to be the last for download
too.
Best
Wishes
Alan
G3NYK
-----
Original Message -----
Sent:
Friday, November 25, 2022 5:36 PM
Subject:
[UKMicrowaves] Anyone want to cast
their eye over ...
Anyone want to cast their eye
over this Local Oscillator board
before I send off for a board or
5?
Crystek VCO locked to a
10/20/40 MHz OCXO via a 4513
synth chip .. to generate a low
spurii/low phase noise 2256 MHz
or whatever signal (depending on
choice of VCO)
The 10/20/40 MHz OCXO can be
locked to an external 10 MHz
reference by an ADF4001, and a
few logic gates to decide if the
10MHz signal is present ...
A PGA105+ lifts and buffers
the output, with a pad in front
to allow for setting of output
level.
I've made a half-hearted
attempt at isolating the various
power feeds to the ADF chips
with 100nH chokes and pairs of
decoupling caps etc, 4 layer
board with a RF ground layer
immediately beneath the top
layer, power and control signals
run around on the lower two
layers.
LEDs indicate lock of each
VCO stage and the presence of
10MHz ... anything else needed?
I have a spare pin on the
ATTINY45, I could load an
alternate set of frequency
control registers maybe?
The OCXO can draw 600mA at
warmup, 200mA running, so the
12V->5V reg is going to take
a bit of a pasting, but I really
don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up
on GitHUB if anyone is
interested. I am trying to
remember if the 148x111 Eisch
tinplate boxes are external or
internal size ..
If anyone spots any obvious
errors, or has some design note
ideas let me know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Mark GM4ISM
gm4ism@...
dc2light.co.uk
-- Robin Szemeti - G1YFG
|
|

Saro Satcom
Hi Robin,Don't forget to add the OCXO Ref Multiturn Trimpot Potentiometer.
73 Saro VU2OBR
toggle quoted messageShow quoted text
Hi Mark,
The "current" version is the one on GitHub, I push changes to there.
I did re-number, the matching schematic and layout below. Point about regulator noted, rotated and re-routed. Hopefully that will be sufficient, I did wonder about providing a separate feed to the 5V reg, from outside th box, which would enable the OCXO to be left powered up, which may be useful ... and a dropper resistor could help spread the heat. The input track is easily accessible, so it won't be an issue I think.
Current (hopefully matching versions) attached.
Hi Robin
If I am reading it correctly schematic in your original post and
the layout don't seem to match up with regards to component labels
The 5V reg is IC9? but looks like its labelled IC6 on the
layout?
Regardless, if the regulator is being stressed, it may be
better to have its tab right next to the board edge. That way,
when the board is soldered into the case, the case will be able to
provide a better heatsink.
On several units I have, including a 3cm DB6NT G2 transverter, I
have soldered copper tabs to the outside of the tinplate box
adjacent to the regulators and taken them straight to the side of
the enclosure (die cast box). Tinplate boxes are not great
heatsinks either, especially inside a sealed box.
The internals of the G2 run a lot cooler because of this.
Mark GM4ISM
On 25/11/2022 23:20, Robin Szemeti -
G1YFG via groups.io wrote:
Bit of a clean up ... Andy's suggestion incorporated,
GitHub updated ...
Denis,
If Alan can't help I have a couple that I don't need
immediately (but will in due course).
I can bring them to breakfast tomorrow.
If anyone is looking for Iceni 70cm transverter kits, I
have some parts including PCBs, helical filters, mixers
and semiconductors (MMICs, bipolars). I have a few 101MHz
crystals.
Probably no boxes, although the board fits nicely into
one of the Hammond cases.
Enquiries off reflector, please.
73 de Sam, G4DDK
Sent tomorrow from my iPad 10
Robin
Sorry
Alan
If you have a couple of Anglian boxes going
spare, if not could your please order a pair for me.
Many thanks
Denis
G0OLX
PS
I could pick them up at the next Saturday morning
breakfast meeting to save the postage !!!!
I'm beginning to doubt my own
sanity ... why I am I bleating on about a 148
box when the board is very clearly 111x55? I
think I need to go for a bit of a walk ...
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the
size down ... The current Eisch catalog
is 2017
It shows the 148x111 box ... let me
know if you are likely to place an order
soon, or I'll just order direct, as I
need 25 Anglian boxes as well.
Hi
Robin, Eisch sizes are external.
you need to subtract 2mm to be
safe and don't forget the flange
on two oposite corners. Check your
size is in the cataloge because I
dont remember seeing 148 x 111mm ,
but that maybe because its one I
have never been asked for. My
printed cat is Kat09 which may
account for it. However the last
one I downloaded was May 2017 and
that only goes to 148 x 75mm. This
seems to be the last for download
too.
Best
Wishes
Alan
G3NYK
-----
Original Message -----
Sent:
Friday, November 25, 2022 5:36 PM
Subject:
[UKMicrowaves] Anyone want to cast
their eye over ...
Anyone want to cast their eye
over this Local Oscillator board
before I send off for a board or
5?
Crystek VCO locked to a
10/20/40 MHz OCXO via a 4513
synth chip .. to generate a low
spurii/low phase noise 2256 MHz
or whatever signal (depending on
choice of VCO)
The 10/20/40 MHz OCXO can be
locked to an external 10 MHz
reference by an ADF4001, and a
few logic gates to decide if the
10MHz signal is present ...
A PGA105+ lifts and buffers
the output, with a pad in front
to allow for setting of output
level.
I've made a half-hearted
attempt at isolating the various
power feeds to the ADF chips
with 100nH chokes and pairs of
decoupling caps etc, 4 layer
board with a RF ground layer
immediately beneath the top
layer, power and control signals
run around on the lower two
layers.
LEDs indicate lock of each
VCO stage and the presence of
10MHz ... anything else needed?
I have a spare pin on the
ATTINY45, I could load an
alternate set of frequency
control registers maybe?
The OCXO can draw 600mA at
warmup, 200mA running, so the
12V->5V reg is going to take
a bit of a pasting, but I really
don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up
on GitHUB if anyone is
interested. I am trying to
remember if the 148x111 Eisch
tinplate boxes are external or
internal size ..
If anyone spots any obvious
errors, or has some design note
ideas let me know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Mark GM4ISM
gm4ism@...
dc2light.co.uk
-- Robin Szemeti - G1YFG
|
|

Andy G4JNT
You have added the 10R resistor in the input to the buffer. That serves no purpose,other than perhaps add a bit of stability. I stick a few ohms, or tens of, in series with the the L + DC feed, to give a bit more stabilisation in DC operating conditions.
toggle quoted messageShow quoted text
Hi Mark,
The "current" version is the one on GitHub, I push changes to there.
I did re-number, the matching schematic and layout below. Point about regulator noted, rotated and re-routed. Hopefully that will be sufficient, I did wonder about providing a separate feed to the 5V reg, from outside th box, which would enable the OCXO to be left powered up, which may be useful ... and a dropper resistor could help spread the heat. The input track is easily accessible, so it won't be an issue I think.
Current (hopefully matching versions) attached.
Hi Robin
If I am reading it correctly schematic in your original post and
the layout don't seem to match up with regards to component labels
The 5V reg is IC9? but looks like its labelled IC6 on the
layout?
Regardless, if the regulator is being stressed, it may be
better to have its tab right next to the board edge. That way,
when the board is soldered into the case, the case will be able to
provide a better heatsink.
On several units I have, including a 3cm DB6NT G2 transverter, I
have soldered copper tabs to the outside of the tinplate box
adjacent to the regulators and taken them straight to the side of
the enclosure (die cast box). Tinplate boxes are not great
heatsinks either, especially inside a sealed box.
The internals of the G2 run a lot cooler because of this.
Mark GM4ISM
On 25/11/2022 23:20, Robin Szemeti -
G1YFG via groups.io wrote:
Bit of a clean up ... Andy's suggestion incorporated,
GitHub updated ...
Denis,
If Alan can't help I have a couple that I don't need
immediately (but will in due course).
I can bring them to breakfast tomorrow.
If anyone is looking for Iceni 70cm transverter kits, I
have some parts including PCBs, helical filters, mixers
and semiconductors (MMICs, bipolars). I have a few 101MHz
crystals.
Probably no boxes, although the board fits nicely into
one of the Hammond cases.
Enquiries off reflector, please.
73 de Sam, G4DDK
Sent tomorrow from my iPad 10
Robin
Sorry
Alan
If you have a couple of Anglian boxes going
spare, if not could your please order a pair for me.
Many thanks
Denis
G0OLX
PS
I could pick them up at the next Saturday morning
breakfast meeting to save the postage !!!!
I'm beginning to doubt my own
sanity ... why I am I bleating on about a 148
box when the board is very clearly 111x55? I
think I need to go for a bit of a walk ...
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the
size down ... The current Eisch catalog
is 2017
It shows the 148x111 box ... let me
know if you are likely to place an order
soon, or I'll just order direct, as I
need 25 Anglian boxes as well.
Hi
Robin, Eisch sizes are external.
you need to subtract 2mm to be
safe and don't forget the flange
on two oposite corners. Check your
size is in the cataloge because I
dont remember seeing 148 x 111mm ,
but that maybe because its one I
have never been asked for. My
printed cat is Kat09 which may
account for it. However the last
one I downloaded was May 2017 and
that only goes to 148 x 75mm. This
seems to be the last for download
too.
Best
Wishes
Alan
G3NYK
-----
Original Message -----
Sent:
Friday, November 25, 2022 5:36 PM
Subject:
[UKMicrowaves] Anyone want to cast
their eye over ...
Anyone want to cast their eye
over this Local Oscillator board
before I send off for a board or
5?
Crystek VCO locked to a
10/20/40 MHz OCXO via a 4513
synth chip .. to generate a low
spurii/low phase noise 2256 MHz
or whatever signal (depending on
choice of VCO)
The 10/20/40 MHz OCXO can be
locked to an external 10 MHz
reference by an ADF4001, and a
few logic gates to decide if the
10MHz signal is present ...
A PGA105+ lifts and buffers
the output, with a pad in front
to allow for setting of output
level.
I've made a half-hearted
attempt at isolating the various
power feeds to the ADF chips
with 100nH chokes and pairs of
decoupling caps etc, 4 layer
board with a RF ground layer
immediately beneath the top
layer, power and control signals
run around on the lower two
layers.
LEDs indicate lock of each
VCO stage and the presence of
10MHz ... anything else needed?
I have a spare pin on the
ATTINY45, I could load an
alternate set of frequency
control registers maybe?
The OCXO can draw 600mA at
warmup, 200mA running, so the
12V->5V reg is going to take
a bit of a pasting, but I really
don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up
on GitHUB if anyone is
interested. I am trying to
remember if the 148x111 Eisch
tinplate boxes are external or
internal size ..
If anyone spots any obvious
errors, or has some design note
ideas let me know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Mark GM4ISM
gm4ism@...
dc2light.co.uk
-- Robin Szemeti - G1YFG
|
|
Methinks these Eisch boxes are really strapubox K25, available from
multiple sources,
and quite common here in Germany. For example:
< https://www.segor.de/#Q=K25&M=1 > , 3rd entry
73,
Gerhard DK4XP
Am 25.11.22 um 19:28 schrieb Robin
Szemeti - G1YFG via groups.io:
toggle quoted messageShow quoted text
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the size down ... The current
Eisch catalog is 2017
It shows the 148x111 box ... let me know if you are likely
to place an order soon, or I'll just order direct, as I need
25 Anglian boxes as well.
Hi Robin, Eisch sizes are
external. you need to subtract 2mm to be safe and don't
forget the flange on two oposite corners. Check your
size is in the cataloge because I dont remember seeing
148 x 111mm , but that maybe because its one I have
never been asked for. My printed cat is Kat09 which may
account for it. However the last one I downloaded was
May 2017 and that only goes to 148 x 75mm. This seems to
be the last for download too.
|
|
toggle quoted messageShow quoted text
Methinks these Eisch boxes are really strapubox K25, available
from multiple sources,
and quite common here in Germany. For example:
< https://www.segor.de/#Q=K25&M=1
> , 3rd entry
73,
Gerhard DK4XP
|
|
OK Denis, then these two boxes will probably go with the Iceni enquiries I have received overnight. I have also asked Alan to order me a few more boxes, as well, so one way or another you should be getting the boxes!
Good luck with the eye.
BTW, targeting getting the 3cm EME up for Julian and Co next weekend.
Sam Sent tomorrow from my time machine
toggle quoted messageShow quoted text
On 26 Nov 2022, at 00:24, Denis Stanton G0OLX <Stantondenis@...> wrote:
Sam Thanks for the offer of the boxes Still unable to drive after the detached retina I will check if they are urgent otherwise it can wait until the new year Happy Christmas to you Maybe work you off the moon soon Best 73 Denis G0OLX On 26 Nov 2022, at 00:02, Mark GM4ISM via groups.io <gm4ism@...> wrote:
Hi Robin
If I am reading it correctly schematic in your original post and
the layout don't seem to match up with regards to component labels
The 5V reg is IC9? but looks like its labelled IC6 on the
layout?
Regardless, if the regulator is being stressed, it may be
better to have its tab right next to the board edge. That way,
when the board is soldered into the case, the case will be able to
provide a better heatsink.
On several units I have, including a 3cm DB6NT G2 transverter, I
have soldered copper tabs to the outside of the tinplate box
adjacent to the regulators and taken them straight to the side of
the enclosure (die cast box). Tinplate boxes are not great
heatsinks either, especially inside a sealed box.
The internals of the G2 run a lot cooler because of this.
Mark GM4ISM
On 25/11/2022 23:20, Robin Szemeti -
G1YFG via groups.io wrote:
Bit of a clean up ... Andy's suggestion incorporated,
GitHub updated ...
Denis,
If Alan can't help I have a couple that I don't need
immediately (but will in due course).
I can bring them to breakfast tomorrow.
If anyone is looking for Iceni 70cm transverter kits, I
have some parts including PCBs, helical filters, mixers
and semiconductors (MMICs, bipolars). I have a few 101MHz
crystals.
Probably no boxes, although the board fits nicely into
one of the Hammond cases.
Enquiries off reflector, please.
73 de Sam, G4DDK
Sent tomorrow from my iPad 10
Robin
Sorry
Alan
If you have a couple of Anglian boxes going
spare, if not could your please order a pair for me.
Many thanks
Denis
G0OLX
PS
I could pick them up at the next Saturday morning
breakfast meeting to save the postage !!!!
I'm beginning to doubt my own
sanity ... why I am I bleating on about a 148
box when the board is very clearly 111x55? I
think I need to go for a bit of a walk ...
Noted Andy/JNT and added a 10R ...
Noted Alan/NYK ... I'll trim the
size down ... The current Eisch catalog
is 2017
It shows the 148x111 box ... let me
know if you are likely to place an order
soon, or I'll just order direct, as I
need 25 Anglian boxes as well.
Hi
Robin, Eisch sizes are external.
you need to subtract 2mm to be
safe and don't forget the flange
on two oposite corners. Check your
size is in the cataloge because I
dont remember seeing 148 x 111mm ,
but that maybe because its one I
have never been asked for. My
printed cat is Kat09 which may
account for it. However the last
one I downloaded was May 2017 and
that only goes to 148 x 75mm. This
seems to be the last for download
too.
Best
Wishes
Alan
G3NYK
-----
Original Message -----
Sent:
Friday, November 25, 2022 5:36 PM
Subject:
[UKMicrowaves] Anyone want to cast
their eye over ...
Anyone want to cast their eye
over this Local Oscillator board
before I send off for a board or
5?
Crystek VCO locked to a
10/20/40 MHz OCXO via a 4513
synth chip .. to generate a low
spurii/low phase noise 2256 MHz
or whatever signal (depending on
choice of VCO)
The 10/20/40 MHz OCXO can be
locked to an external 10 MHz
reference by an ADF4001, and a
few logic gates to decide if the
10MHz signal is present ...
A PGA105+ lifts and buffers
the output, with a pad in front
to allow for setting of output
level.
I've made a half-hearted
attempt at isolating the various
power feeds to the ADF chips
with 100nH chokes and pairs of
decoupling caps etc, 4 layer
board with a RF ground layer
immediately beneath the top
layer, power and control signals
run around on the lower two
layers.
LEDs indicate lock of each
VCO stage and the presence of
10MHz ... anything else needed?
I have a spare pin on the
ATTINY45, I could load an
alternate set of frequency
control registers maybe?
The OCXO can draw 600mA at
warmup, 200mA running, so the
12V->5V reg is going to take
a bit of a pasting, but I really
don't fancy doing a buck
converter for obvious reasons.
I'll put the Eagle files up
on GitHUB if anyone is
interested. I am trying to
remember if the 148x111 Eisch
tinplate boxes are external or
internal size ..
If anyone spots any obvious
errors, or has some design note
ideas let me know ...
--
Best regards,
Robin Szemeti, G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Robin Szemeti - G1YFG
--
Mark GM4ISM
gm4ism@...
dc2light.co.uk
|
|