Date   
Re: FT818

Ed G3VPF
 

Paul

 

The DC on the cable is not a problem, I do not have either a spectrum analyser or a power meter. I do have transverters at the other end of the garden that need some DC on the feeder during transmit in order to change from receive to transmit. The mod to the FT817 feeds a voltage onto the cable via a resistor and this is sensed in the transverter. The intent of my message was to find out if anyone has carried out this modification to the FT818. On the FT817 it is a simple mod, just add a resistor and a capacitor and a short length of wire. My FT817 is now falling apart, it was one of the first batch into the UK many years ago. I hope to replace it with an FT818 but was wondering if anyone has modified the newer rig in the same way.

 

Ed G3VPF

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of simonchettle
Sent: 07 April 2019 00:32
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] FT818

 

thanks Paul for the warning – I had not thought of spikes and as you say / imply a capacitor could look like a direct connection.

Simon

 

From: Paul Bicknell

Sent: Saturday, April 6, 2019 9:36 PM

Subject: Re: [UKMicrowaves] FT818

 

Hi Ed

 

We have just had a thread about power measurement and protecting test equipment such as spectrum analysers

 

Any DC on a coax or on a RF signal has  a high possibility of causing a disaster resulting in £100’s if not £1000’s of damage

 

So please be advised that even the DC on a LNB cable can kill a HP noise meter and this is after a blocking capacitor?

The problem is the spikes from connecting / switching  on and polarisation switching voltage go through the blocking capacitor

There is advise from HP on how to minimise the risk

 

Regards Paul B


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Ed G3VPF
Sent: 06 April 2019 18:02
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] FT818

 

Is anyone using the FT818 as a microwave IF? Is there a simple mod to put volts on the RF output on transmit like the FT817?

 

Ed G3VPF

 

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK

Re: moddified LNB wanted

militaryoperator
 

OK Paul, £11 ok. 

Not used to such complicated websites. 

Thanks. Ben.

-----Original Message-----
From: PAUL NICKALLS via Groups.Io <paulnick@...>
To: UKMicrowaves <UKMicrowaves@groups.io>
Sent: Sun, 7 Apr 2019 21:14
Subject: Re: [UKMicrowaves] moddified LNB wanted

That is the price for 250 - total £2194.88.
The cut tape price is £11.09.
The TR stands for Tape&Reel which has a minimum quantity of 250.
73
Paul.

Re: moddified LNB wanted

PAUL NICKALLS
 

That is the price for 250 - total £2194.88.
The cut tape price is £11.09.
The TR stands for Tape&Reel which has a minimum quantity of 250.
73
Paul.

On 07/04/2019 18:38, militaryoperator via Groups.Io wrote:
Digi-Key Part Number CW654TR-ND
D75F-025-0M
£8.78 each. 

I am not at Martlesham so will need it posting afterwards Paul. Thanks, Ben.

Military Wireless Museum
Kidderminster, UK.


-----Original Message-----
From: Paul Bicknell <paul@...>
To: UKMicrowaves <UKMicrowaves@groups.io>
Sent: Sun, 7 Apr 2019 15:45
Subject: Re: [UKMicrowaves] moddified LNB wanted

Hi Sorry could you just point me to the specification and price
 
As I am looking for a duel socket   LNB so I can modify the second socket and send up a local Oscillator reference
 
Attending Martlesham
 

From: UKMicrowaves@groups.io [mailto: UKMicrowaves@groups.io ] On Behalf Of militaryoperator via Groups.Io
Sent: 07 April 2019 09:21
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] moddified LNB wanted
 
 
Hi,
We are just about to place a DigiKey order if anyone want to add to it to save carriage.  We can deliver to Martlesham or drop it in the post.
Paul G8AQA
 
Paul. I sent message direct re ordering a chip, did not hear back, just wonder if you received it? 
 
Ben 
 
 
--------------------------------------------------
I'll take one of these if you would be so kind Paul. 
Ben G4BXD.
-------------------------------------
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.

--
Paul Bicknell G8KFW   South Coast UK


Virus-free. www.avg.com

Re: moddified LNB wanted

militaryoperator
 

Digi-Key Part NumberCW654TR-ND
D75F-025-0M
£8.78 each. 

I am not at Martlesham so will need it posting afterwards Paul. Thanks, Ben.

Military Wireless Museum
Kidderminster, UK.


-----Original Message-----
From: Paul Bicknell <paul@...>
To: UKMicrowaves <UKMicrowaves@groups.io>
Sent: Sun, 7 Apr 2019 15:45
Subject: Re: [UKMicrowaves] moddified LNB wanted

Hi Sorry could you just point me to the specification and price
 
As I am looking for a duel socket   LNB so I can modify the second socket and send up a local Oscillator reference
 
Attending Martlesham
 

From: UKMicrowaves@groups.io [mailto: UKMicrowaves@groups.io ] On Behalf Of militaryoperator via Groups.Io
Sent: 07 April 2019 09:21
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] moddified LNB wanted
 
 
Hi,
We are just about to place a DigiKey order if anyone want to add to it to save carriage.  We can deliver to Martlesham or drop it in the post.
Paul G8AQA
 
Paul. I sent message direct re ordering a chip, did not hear back, just wonder if you received it? 
 
Ben 
 
 
--------------------------------------------------
I'll take one of these if you would be so kind Paul. 
Ben G4BXD.
-------------------------------------
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.

--
Paul Bicknell G8KFW   South Coast UK

Re: Radome for Red Rocket LNB Dual Feed?

Barry Chambers
 

Adrian

The cow's face was looking at the brass shim "washer" from one end.

I forgot to mention that the large circular pads you can see on the LNB pcb are the connections to the LNB xtal which is on the back of the pcb. There is no need to disconnect the xtal. The 25MHz locking signal is fed to one of the xtal pads via a 1nF capacitor.

The Rocket LNB seems very sensitive - at least as good as the Octagon.

73

Barry, G8AGN
On 07/04/2019 14:42, Adrian G4UVZ via Groups.Io wrote:

Thanks Barry ..that looks very interesting..I follow all apart from the 'cows face'?

This might be apparent once the project is in progress!

My rocket is about 450KHz off freq but is very stable

A---Original message----
From : b.chambers@...
Date : 07/04/2019 - 14:23 (BST)
To : UKMicrowaves@groups.io
Subject : Re: [UKMicrowaves] Radome for Red Rocket LNB Dual Feed?

Adrian

I have a single Rocket LNB coupled up to the dual band feed via a 22mm compression pipe coupler. When you remove the red plastic end of the LNB, saw off the flange at the end of the pipe and slide the pipe into one end of the coupler. Since the LNB pipe outer diameter is about 21mm, it will need some packing to ensure a tight fit. I used a piece of thin brass sheet formed into a deformed circle whose ends were bent slightly to form sharp horns (image a cow's face) and this then grips the LNB pipe tightly, even before you fit the compression joint "olive" and locking nut.

My Rocket LNB has a 25MHz xtal and a PLL chip. As is, it the LNB is tuning about 500kHz low (poor quality xtal in the LNB). I am now locking mine using a LeoBodnar GPS oscillator set to its lowest  output level. The connections to the LNB are shown in the photos. The locking signal to the LNB should be fed via a low-pass filter. A suitable design is given on the BATC QO100 Wiki LNB page. The UKuG Chipbank stocks suitable variable inductors.

Hope this helps.

73

Barry, G8AGN
On 07/04/2019 08:03, Adrian G4UVZ via Groups.Io wrote:
Assuming that a way can be found to fit the plate feed to the Red Rocket LNB......maybe splitting the two elements in half and bolting together?
 
Has anyone considered '3D Printing' a Radome?  
 
Outside of my field of expertise ...not sure what the RF properties are of the various plastic filaments?   but the front window could be very thin?


Re: PCB

KENT BRITAIN
 

Plain sewing scissors will work well.
I typically use a paper cutter, Gives me nice straight edges.

Found a sheet of 20 mil in the Arlon pile.   Kind of, pretty sure, it just might, perhaps
Arlon, will bring it along.         20/2.54 = .79 mm

On Sunday, April 7, 2019, 10:13:43 AM CDT, Gordon REASON via Groups.Io <gordonj.reason@...> wrote:


3 inch roughly square Kent ...............

can it be cut into shape using Tin shears ????


I am in hope of making a poor mans wideband return loss bridge ...!

On 07 April 2019 at 16:07 KENT BRITAIN <WA5VJB@...> wrote:

 
Hi Gordon

How big a piece?      I don't have time to get any 4350 by then,
but I do have a stock of Arlon 25N which is virtually identical.

73 Kent G8EMY/W5

On Sunday, April 7, 2019, 9:48:25 AM CDT, Gordon REASON via Groups.Io <gordonj.reason@...> wrote:


I cannot make it to Martlesham ...........

I'm having uneccessary trouble , trying to get hold of some Rogers RO4350B  pcb material ....

The world has gone bonkers ........................


Double sided ,   0.8 mm 1.0 oz copper ..........just need a bit to try , would there be some at Martlesham by any chance ???

Thanks ..........


 


 

Re: PCB

Gordon REASON
 

3 inch roughly square Kent ...............

can it be cut into shape using Tin shears ????


I am in hope of making a poor mans wideband return loss bridge ...!

On 07 April 2019 at 16:07 KENT BRITAIN <WA5VJB@...> wrote:

 
Hi Gordon

How big a piece?      I don't have time to get any 4350 by then,
but I do have a stock of Arlon 25N which is virtually identical.

73 Kent G8EMY/W5

On Sunday, April 7, 2019, 9:48:25 AM CDT, Gordon REASON via Groups.Io <gordonj.reason@...> wrote:


I cannot make it to Martlesham ...........

I'm having uneccessary trouble , trying to get hold of some Rogers RO4350B  pcb material ....

The world has gone bonkers ........................


Double sided ,   0.8 mm 1.0 oz copper ..........just need a bit to try , would there be some at Martlesham by any chance ???

Thanks ..........


 


 

Re: PCB

KENT BRITAIN
 

Hi Gordon

How big a piece?      I don't have time to get any 4350 by then,
but I do have a stock of Arlon 25N which is virtually identical.

73 Kent G8EMY/W5

On Sunday, April 7, 2019, 9:48:25 AM CDT, Gordon REASON via Groups.Io <gordonj.reason@...> wrote:


I cannot make it to Martlesham ...........

I'm having uneccessary trouble , trying to get hold of some Rogers RO4350B  pcb material ....

The world has gone bonkers ........................


Double sided ,   0.8 mm 1.0 oz copper ..........just need a bit to try , would there be some at Martlesham by any chance ???

Thanks ..........

Re: Activity list for the UK Microwave Group Low Band Contest Sunday 7th April

Mike Webb
 

Sorry all couldnt get on still waiting for parts to arrive to attach tripod to trailer to go portable

See pic 23/13cm1.2m dish and septum feed for 13  and 2x67 for 23cm Hopefully for 2 weeks on tuesday


--
Mike GD6ICR IO74PF73TW

PCB

Gordon REASON
 

I cannot make it to Martlesham ...........

I'm having uneccessary trouble , trying to get hold of some Rogers RO4350B  pcb material ....

The world has gone bonkers ........................


Double sided ,   0.8 mm 1.0 oz copper ..........just need a bit to try , would there be some at Martlesham by any chance ???

Thanks ..........

Re: moddified LNB wanted

Paul G8KFW
 

Hi Sorry could you just point me to the specification and price

 

As I am looking for a duel socket   LNB so I can modify the second socket and send up a local Oscillator reference

 

Attending Martlesham

 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of militaryoperator via Groups.Io
Sent: 07 April 2019 09:21
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] moddified LNB wanted

 

 

Hi,
We are just about to place a DigiKey order if anyone want to add to it to save carriage.  We can deliver to Martlesham or drop it in the post.
Paul G8AQA

 

Paul. I sent message direct re ordering a chip, did not hear back, just wonder if you received it? 

 

Ben 

 

 

--------------------------------------------------

I'll take one of these if you would be so kind Paul. 

Ben G4BXD.

-------------------------------------

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK

Re: Martlesham

Richard <richard@...>
 

many thanks John

On Sun, 2019-04-07 at 14:29 +0100, John Lemay wrote:
Richard

There are services between Martlesham and the Orwell bridge, both
directions

John G4ZTR


-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On
Behalf Of Richard
Sent: 07 April 2019 14:00
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Martlesham

I'll be with my xyl on Sunday, who will be dropping me off at
Martlsham
and driving on to Rayleigh.
Are there services southbound on the A12 close to Martlesham as no
doubt she'll want a wee before driving south ?
or just easier to add her to the attending list at the event ?
tia

Re: Radome for Red Rocket LNB Dual Feed?

Colin G4EML
 

I did try 3D printing a radome from white ABS. It is difficult to print something that large very thin so it ended up about 3mm thick.  The end result was a little lossy on 10GHz. Caused a reduction in signal of about 2dB, probably OK for narrowband but  too much for wideband TV.  Currently covered with a plastic bag which is OK if it stays dry. Planning to use 125mm ducting tube to make an open ended rain shield. 



On 7 Apr 2019, at 14:23, Barry Chambers <b.chambers@...> wrote:

Adrian

I have a single Rocket LNB coupled up to the dual band feed via a 22mm compression pipe coupler. When you remove the red plastic end of the LNB, saw off the flange at the end of the pipe and slide the pipe into one end of the coupler. Since the LNB pipe outer diameter is about 21mm, it will need some packing to ensure a tight fit. I used a piece of thin brass sheet formed into a deformed circle whose ends were bent slightly to form sharp horns (image a cow's face) and this then grips the LNB pipe tightly, even before you fit the compression joint "olive" and locking nut.

My Rocket LNB has a 25MHz xtal and a PLL chip. As is, it the LNB is tuning about 500kHz low (poor quality xtal in the LNB). I am now locking mine using a LeoBodnar GPS oscillator set to its lowest  output level. The connections to the LNB are shown in the photos. The locking signal to the LNB should be fed via a low-pass filter. A suitable design is given on the BATC QO100 Wiki LNB page. The UKuG Chipbank stocks suitable variable inductors.

Hope this helps.

73

Barry, G8AGN
On 07/04/2019 08:03, Adrian G4UVZ via Groups.Io wrote:
Assuming that a way can be found to fit the plate feed to the Red Rocket LNB......maybe splitting the two elements in half and bolting together?
 
Has anyone considered '3D Printing' a Radome?  
 
Outside of my field of expertise ...not sure what the RF properties are of the various plastic filaments?   but the front window could be very thin?
<IMG_2783.JPG>
<IMG_2786.JPG>
<IMG_2766.JPG>

Re: Radome for Red Rocket LNB Dual Feed?

Adrian G4UVZ
 

Thanks Barry ..that looks very interesting..I follow all apart from the 'cows face'?

This might be apparent once the project is in progress!

My rocket is about 450KHz off freq but is very stable

A---Original message----
From : b.chambers@...
Date : 07/04/2019 - 14:23 (BST)
To : UKMicrowaves@groups.io
Subject : Re: [UKMicrowaves] Radome for Red Rocket LNB Dual Feed?

Adrian

I have a single Rocket LNB coupled up to the dual band feed via a 22mm compression pipe coupler. When you remove the red plastic end of the LNB, saw off the flange at the end of the pipe and slide the pipe into one end of the coupler. Since the LNB pipe outer diameter is about 21mm, it will need some packing to ensure a tight fit. I used a piece of thin brass sheet formed into a deformed circle whose ends were bent slightly to form sharp horns (image a cow's face) and this then grips the LNB pipe tightly, even before you fit the compression joint "olive" and locking nut.

My Rocket LNB has a 25MHz xtal and a PLL chip. As is, it the LNB is tuning about 500kHz low (poor quality xtal in the LNB). I am now locking mine using a LeoBodnar GPS oscillator set to its lowest  output level. The connections to the LNB are shown in the photos. The locking signal to the LNB should be fed via a low-pass filter. A suitable design is given on the BATC QO100 Wiki LNB page. The UKuG Chipbank stocks suitable variable inductors.

Hope this helps.

73

Barry, G8AGN
On 07/04/2019 08:03, Adrian G4UVZ via Groups.Io wrote:
Assuming that a way can be found to fit the plate feed to the Red Rocket LNB......maybe splitting the two elements in half and bolting together?
 
Has anyone considered '3D Printing' a Radome?  
 
Outside of my field of expertise ...not sure what the RF properties are of the various plastic filaments?   but the front window could be very thin?


Re: Martlesham

John Lemay
 

Richard

There are services between Martlesham and the Orwell bridge, both directions

John G4ZTR

-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Richard
Sent: 07 April 2019 14:00
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Martlesham

I'll be with my xyl on Sunday, who will be dropping me off at Martlsham
and driving on to Rayleigh.
Are there services southbound on the A12 close to Martlesham as no
doubt she'll want a wee before driving south ?
or just easier to add her to the attending list at the event ?
tia
--
Best wishes /73
Richard Bown

Email : richard@...

HTTP : http://www.g8jvm.com

######################################################################

Ham Call: G8JVM . QRV: 50-432 MHz + Microwave
Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W
QRV 6mtrs 200W, 4mtrs 150W, 2mtrs 300W, 70cms 200W,
Microwave 1296MHz 140W, 2320MHz 100W & 10368MHz 5W
OS: Linux Mint 19.1 x86_64 Tessa, on a Dell Inspiron N5030 laptop
######################################################################

Re: Radome for Red Rocket LNB Dual Feed?

Barry Chambers
 

Adrian

I have a single Rocket LNB coupled up to the dual band feed via a 22mm compression pipe coupler. When you remove the red plastic end of the LNB, saw off the flange at the end of the pipe and slide the pipe into one end of the coupler. Since the LNB pipe outer diameter is about 21mm, it will need some packing to ensure a tight fit. I used a piece of thin brass sheet formed into a deformed circle whose ends were bent slightly to form sharp horns (image a cow's face) and this then grips the LNB pipe tightly, even before you fit the compression joint "olive" and locking nut.

My Rocket LNB has a 25MHz xtal and a PLL chip. As is, it the LNB is tuning about 500kHz low (poor quality xtal in the LNB). I am now locking mine using a LeoBodnar GPS oscillator set to its lowest  output level. The connections to the LNB are shown in the photos. The locking signal to the LNB should be fed via a low-pass filter. A suitable design is given on the BATC QO100 Wiki LNB page. The UKuG Chipbank stocks suitable variable inductors.

Hope this helps.

73

Barry, G8AGN
On 07/04/2019 08:03, Adrian G4UVZ via Groups.Io wrote:

Assuming that a way can be found to fit the plate feed to the Red Rocket LNB......maybe splitting the two elements in half and bolting together?
 
Has anyone considered '3D Printing' a Radome?  
 
Outside of my field of expertise ...not sure what the RF properties are of the various plastic filaments?   but the front window could be very thin?

Martlesham

Richard <richard@...>
 

I'll be with my xyl on Sunday, who will be dropping me off at Martlsham
and driving on to Rayleigh.
Are there services southbound on the A12 close to Martlesham as no
doubt she'll want a wee before driving south ?
or just easier to add her to the attending list at the event ?
tia
--
Best wishes /73
Richard Bown

Email : richard@...

HTTP : http://www.g8jvm.com

######################################################################

Ham Call: G8JVM . QRV: 50-432 MHz + Microwave
Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W
QRV 6mtrs 200W, 4mtrs 150W, 2mtrs 300W, 70cms 200W,
Microwave 1296MHz 140W, 2320MHz 100W & 10368MHz 5W
OS: Linux Mint 19.1 x86_64 Tessa, on a Dell Inspiron N5030 laptop
######################################################################

Re: Anyone for 23cms tests ???

Graham - G3YJR
 

It looks like I may be available on 23cm this afternoon, so I hope to work you later.
Graham

Re: moddified LNB wanted

militaryoperator
 


Hi,
We are just about to place a DigiKey order if anyone want to add to it to save carriage.  We can deliver to Martlesham or drop it in the post.
Paul G8AQA

Paul. I sent message direct re ordering a chip, did not hear back, just wonder if you received it? 

Ben 


--------------------------------------------------
I'll take one of these if you would be so kind Paul. 
Ben G4BXD.
-------------------------------------

Radome for Red Rocket LNB Dual Feed?

Adrian G4UVZ
 

Assuming that a way can be found to fit the plate feed to the Red Rocket LNB......maybe splitting the two elements in half and bolting together?
 
Has anyone considered '3D Printing' a Radome?  
 
Outside of my field of expertise ...not sure what the RF properties are of the various plastic filaments?   but the front window could be very thin?