Date   

Re: Another Octagon LNB question

Andy G4JNT
 

Mine switches at 15.6V (by coincidence, checked it just this afternoon)
The low voltage lower limit seems to be around 7.8V - so I guess 9V operation would be fine.  Which allows for a current limiter to be fitted in the DC feed, as I just burned put an SMT choke when briefly shorting the coax.



On Fri, 1 Feb 2019 at 19:01, g8zha via Groups.Io <g8zha-1=blueyonder.co.uk@groups.io> wrote:

What is the minimum voltage needed to switch the LNB polarisation? Do I need 18V or will 15V do? If it is 18V how high can this voltage go?

 

Regards, Rich


Another Octagon LNB question

G8ZHA
 

What is the minimum voltage needed to switch the LNB polarisation? Do I need 18V or will 15V do? If it is 18V how high can this voltage go?

 

Regards, Rich


OT: how your cat can buy to a Octagon dual LNB

Richard <richard@...>
 

Don't start a thread on this as certain people get very peeed off
If you have a cat, P@H have dropped their prices enough for ten 12packs
of certain pouches saves enough to buy an Octagon LNB, only for a short
time. so no excuse not the listen to Eshails2 :)
Dogs can buy you one as well :)

--
Best wishes /73
Richard Bown

Email : richard@g8jvm.com

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: 13cms interdigital filter

alwyn.seeds1
 

Dear John,

Your fellow Countryman PE1RKI sells a 23cm filter that would meet your needs.

Beautifully made and I measure < 0.2 dB passband loss on my samples.

Regards,

Alwyn
 
_____________________________________________________

Alwyn Seeds, Director
SynOptika Ltd.,
114 Beaufort Street,
London,
SW3 6BU,
England.

Tel.: +44 (0) 20 7376 4110


SynOptika Ltd., Registered in England and Wales: No. 04606737
Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom.
_____________________________________________________


Re: 13cms interdigital filter

Pete - GM4BYF
 

Start with the VK3UM software at http://vk3um.com/interdigital%20filter.html

See also http://www.w6pql.com/ with examples of 23cm and 13cm filters

73
Pete GM4BYF
On 01/02/19 17:36, John Lambo wrote:

Yes i am also interested in this.
I have try to make a filter for 23cm what i can use form 1250mhz upt to 1310mhz.
But no result i have a dip at 1280mhz at about 7 db with a 4 pole filter.
So if anyone have a good program to calculate a interdigital filter that wil be nice...

73  John  PA7JB



Op 1-2-2019 om 12:44 schreef Martin G8BHC:
Yes please, Ferdinand.
Perhaps I might republish in Scatterpoint (english translation)?
73
Martin RH G8BHC

On 1 Feb 2019, at 08:35, Ferdinand DC8EC <dc8ec@...> wrote:

Good morning all,

In 1980 I held a lecture at the VHF / UHF conference in Munich on the simple calculation of interdigital filters. Insertion losses of 0.3 dB are no problem. Another advantage is the coupling and decoupling at the 50 ohm point of the first and last resonator. If anyone is interested, I can publish the lecture (in German) at this point.


--
Martin RH G8BHC



--
vry 73
Pete GM4BYF


Re: 13cms interdigital filter

John Lambo
 

Yes i am also interested in this.
I have try to make a filter for 23cm what i can use form 1250mhz upt to 1310mhz.
But no result i have a dip at 1280mhz at about 7 db with a 4 pole filter.
So if anyone have a good program to calculate a interdigital filter that wil be nice...

73  John  PA7JB



Op 1-2-2019 om 12:44 schreef Martin G8BHC:

Yes please, Ferdinand.
Perhaps I might republish in Scatterpoint (english translation)?
73
Martin RH G8BHC

On 1 Feb 2019, at 08:35, Ferdinand DC8EC <dc8ec@...> wrote:

Good morning all,

In 1980 I held a lecture at the VHF / UHF conference in Munich on the simple calculation of interdigital filters. Insertion losses of 0.3 dB are no problem. Another advantage is the coupling and decoupling at the 50 ohm point of the first and last resonator. If anyone is interested, I can publish the lecture (in German) at this point.


--
Martin RH G8BHC



Re: Octagon LNB

Andy G4JNT
 

Ah, didn't read the data sheet properly.    Spotted now that it quotes "For lower frequencies, ensure SR > 130 V/μs."   (SR = slew rate)

For a 0/5V logic input that corresponds to a rise time <38ns which is no big deal using a 74ACxx driver



On Fri, 1 Feb 2019 at 17:05, Andy G4JNT via Groups.Io <andy.g4jnt=gmail.com@groups.io> wrote:
The ADF4113 is specified for Fmin of 200MHz.   How have you made it work with 27MHz input.

I'm guessing by using a square wave and the internal dividers are static logic, so if clocked properly will go down to DC

Even the lowest frequency variant of that family, the ADF4110, only goes down to 800MHz officially.  
May have missed a trick here;  I've quite recently been bemoaning the fact modern synth chips can't go particularly low in frequency



On Fri, 1 Feb 2019 at 16:49, brian.flynn via Groups.Io <brian.flynn=tiscali.co.uk@groups.io> wrote:
Hi Mike,
I have taken the 27 MHz xtal out of my octagon and made an external input using the second F-tyle socke as described by Bernie 'HJW.
I have a waterproof box externally which contains a 27 MHz VCXO based on a varactor tuned Colpitts osc which I have locked to 12.8 MHz ex-cellphone
TCXO.  The PLL uses an ADF4113 with a band width of about 10 Hz. I feed about +10 dbm into the  LNB.  The water proof box with the PLL conrtains a Bias Tee to draw the DC off the LNB feed to power the PLL  I am powering the LNB/dish from a cheapo freesat box which allows Polarisation switching and Hi/Lo band switching.
A byproduct of it is I now get Sat TV as the 60 CM dish I am using is wide enought to pick Astra as well!! The 10706 MHz beacon is about 25 db out of the noise.  There is still a slow drift with temperature but it is only a couple of kHz and I can live with that until I find a better TCXO.

73s
Brian GM8BJF


Re: Octagon LNB

Andy G4JNT
 

The ADF4113 is specified for Fmin of 200MHz.   How have you made it work with 27MHz input.

I'm guessing by using a square wave and the internal dividers are static logic, so if clocked properly will go down to DC

Even the lowest frequency variant of that family, the ADF4110, only goes down to 800MHz officially.  
May have missed a trick here;  I've quite recently been bemoaning the fact modern synth chips can't go particularly low in frequency



On Fri, 1 Feb 2019 at 16:49, brian.flynn via Groups.Io <brian.flynn=tiscali.co.uk@groups.io> wrote:
Hi Mike,
I have taken the 27 MHz xtal out of my octagon and made an external input using the second F-tyle socke as described by Bernie 'HJW.
I have a waterproof box externally which contains a 27 MHz VCXO based on a varactor tuned Colpitts osc which I have locked to 12.8 MHz ex-cellphone
TCXO.  The PLL uses an ADF4113 with a band width of about 10 Hz. I feed about +10 dbm into the  LNB.  The water proof box with the PLL conrtains a Bias Tee to draw the DC off the LNB feed to power the PLL  I am powering the LNB/dish from a cheapo freesat box which allows Polarisation switching and Hi/Lo band switching.
A byproduct of it is I now get Sat TV as the 60 CM dish I am using is wide enought to pick Astra as well!! The 10706 MHz beacon is about 25 db out of the noise.  There is still a slow drift with temperature but it is only a couple of kHz and I can live with that until I find a better TCXO.

73s
Brian GM8BJF


Re: Octagon LNB

Brian Flynn GM8BJF
 

Hi Mike,
I have taken the 27 MHz xtal out of my octagon and made an external input using the second F-tyle socke as described by Bernie 'HJW.
I have a waterproof box externally which contains a 27 MHz VCXO based on a varactor tuned Colpitts osc which I have locked to 12.8 MHz ex-cellphone
TCXO.  The PLL uses an ADF4113 with a band width of about 10 Hz. I feed about +10 dbm into the  LNB.  The water proof box with the PLL conrtains a Bias Tee to draw the DC off the LNB feed to power the PLL  I am powering the LNB/dish from a cheapo freesat box which allows Polarisation switching and Hi/Lo band switching.
A byproduct of it is I now get Sat TV as the 60 CM dish I am using is wide enought to pick Astra as well!! The 10706 MHz beacon is about 25 db out of the noise.  There is still a slow drift with temperature but it is only a couple of kHz and I can live with that until I find a better TCXO.

73s
Brian GM8BJF


Re: Waveguide switch replacement

Paul G8KFW
 

Hi Mike

Is that pool  I am in west Sussex

Paul B


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of John Fell
Sent: 01 February 2019 13:54
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Waveguide switch replacement

 

Approx location is IO80XS77JS .

 

73   John   G0API

 

On Fri, 1 Feb 2019 at 12:31, Paul Bicknell <paul@...> wrote:

Hi john

I think Mike and I have hade the same positive experience with using WG 22 at 24 Ghz 

Regarding spectrum analysers

Yes the 21 GHz    HP 8559 analysers work fine at 24GHz, as that is what I  used for the 24 ghz  FM  TV link I demonstrated at a BATC convention some 30 plus years ago

The old  HP 18 ghz  in the  140 main frame also works OK at 24 ghz using a WG 22 external mixer    

Regarding power measurements the WG 22  HP power sensors are useable at 24 Ghz  

Just as a side question what is your approximate location  

Paul B 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Mike Willis
Sent: 01 February 2019 11:52
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Waveguide switch replacement

WG22 is recommended for 26GHz-40GHz but it is still well above cut-off at 24GHz. I think the New Zealand relays  Iam using are WG22. I simply connected them together directly, by filing slots in the WG20 flange because the hole spacing is different. I used 3 fine screws to tune out the miss-match in the usual manner. It should work OK for narrow bandwidths. If you don't have a 24 GHz VSWR meter or VNA, just use a directional coupler and a sensitive detector (e.g. a spectrum analyser or a crystal detector). The old 22GHz HP8559 analysers work fine at 24GHz, they are un-calibrated but you are only looking for a null.
--
Mike G0MJW

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

_._,_._,_

 


--
Paul Bicknell G8KFW   South Coast UK


Re: Wanted HP 432 B digital power meter

Steve - WB0DBS
 

Paul,

No response from you regarding the keyboards and Hughes mmwave sweeper manual?

Steve
WB0DBS



On Jan 31, 2019, at 9:34 PM, Paul Bicknell <paul@...> wrote:

Hi all I am looking for a HP 432 B power meter this is the digital version of the 432 A analogue version

If you have one I will part exchange for an analogue unit  with appropriate adjustment

 

Also looking for components and wave guide above 100Ghz

Regards Paul B

 

 

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: Waveguide switch replacement

Chris Bartram G4DGU
 

Hello John

I described a fixed, no amateur twiddle-fiddle, transition which does exactly that - and can be made by hand - in Scatterpoint about a decade ago. I believe that one or two people have duplicated it with good results.  GW3TKF commented in conversation that his had achieved around 30dB RL. That concurs pretty well with my own measurements using a (Cornish made!) Flann coupler, and load. The load shows around -37dB RL btw with little sensitivity to load phase.

Like Mike I use one of the Relcom relays on 24 with WG20, and I have the transition on all three ports. I see about 0.3dB IL for the combination of the relay and transitions in both TX and RX. They are still in use, currently mainly for /P operation, but I hope to resume my interrupted work on 24EME later this year when the house is fully mangled!

73

Chris

G4DGU

On 01/02/2019 11:13, John Fell wrote:
I have a defective WG20 switch and a working WG22 switch , both 4 port Ledex activated at 20V d.c.
My question is , could I use the WG22 device on 24GHZ using suitable adaptors ?
If so has anyone got any data on suitable adaptors ?
--
Chris Bartram
Luxulyan, Bodmin, Cornwall

chris@chris-bartram.co.uk


Re: Waveguide switch replacement

John Fell
 

Thanks Mike - metalwork is my thing so it can transition outwards to 10mm heating pipe waveguide .

We have used both 27 and 25MHZ Octagon twins for EME at FRARS .

27MHZ have always worked using Leo B dual or Minis but the 25MHZ Xtals are low spec and usually outside injection lock range .Cure is to remove the Xtal at 25MHZ and take in the external reference via the unused F type to the Xtal track revealed under it , when it is lifted .
A good 25MHZ Xtal can then be used in its own housing in shack and injection locked from a Leo B - that provided similar low noise reference as the basic Xtal to the LNB Synth - or use a Morrion OCXO direct .

Polarity changes hinge around 16V .With F types coming out of LNB horizontally and below 16V supply , the polarity will be Horizontal .

73
John
G0API

On Fri, 1 Feb 2019 at 11:52, Mike Willis <willis.mj@...> wrote:
WG22 is recommended for 26GHz-40GHz but it is still well above cut-off at 24GHz. I think the New Zealand relays  Iam using are WG22. I simply connected them together directly, by filing slots in the WG20 flange because the hole spacing is different. I used 3 fine screws to tune out the miss-match in the usual manner. It should work OK for narrow bandwidths. If you don't have a 24 GHz VSWR meter or VNA, just use a directional coupler and a sensitive detector (e.g. a spectrum analyser or a crystal detector). The old 22GHz HP8559 analysers work fine at 24GHz, they are un-calibrated but you are only looking for a null.
--
Mike G0MJW


Re: Waveguide switch replacement

John Fell
 

Approx location is IO80XS77JS .

73
John
G0API

On Fri, 1 Feb 2019 at 12:31, Paul Bicknell <paul@...> wrote:

Hi john

I think Mike and I have hade the same positive experience with using WG 22 at 24 Ghz

 

Regarding spectrum analysers

Yes the 21 GHz    HP 8559 analysers work fine at 24GHz, as that is what I  used for the 24 ghz  FM  TV link I demonstrated at a BATC convention some 30 plus years ago

The old  HP 18 ghz  in the  140 main frame also works OK at 24 ghz using a WG 22 external mixer  

 

Regarding power measurements the WG 22  HP power sensors are useable at 24 Ghz

 

Just as a side question what is your approximate location  

Paul B

 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Mike Willis
Sent: 01 February 2019 11:52
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Waveguide switch replacement

 

WG22 is recommended for 26GHz-40GHz but it is still well above cut-off at 24GHz. I think the New Zealand relays  Iam using are WG22. I simply connected them together directly, by filing slots in the WG20 flange because the hole spacing is different. I used 3 fine screws to tune out the miss-match in the usual manner. It should work OK for narrow bandwidths. If you don't have a 24 GHz VSWR meter or VNA, just use a directional coupler and a sensitive detector (e.g. a spectrum analyser or a crystal detector). The old 22GHz HP8559 analysers work fine at 24GHz, they are un-calibrated but you are only looking for a null.
--
Mike G0MJW

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: Waveguide switch replacement

John Fell
 

Thanks Paul .
The bandwidth quoted on the Flann site indicated 26.4  -  40.1GHZ  , so good to know it above cutoff still at 24GHZ.

73
John
G0API

On Fri, 1 Feb 2019 at 11:44, Paul Bicknell <paul@...> wrote:

Hi john

Regarding WG 22 the normal band is 26.5 to 40 Ghz  the lower cut off is about 21.1 ghz

 

I regularly use  WG 22 components for testing at 24 Ghz and all works OK

Also other amateurs use  WG 22 for a dual band unit for  24  and 47 Ghz

 

Best of luck with the metal work for any transitions

Regards Paul B

 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of John Fell
Sent: 01 February 2019 11:14
To: ukmicrowaves@groups.io
Subject: [UKMicrowaves] Waveguide switch replacement

 

I have a defective WG20 switch and a working WG22 switch , both 4 port Ledex activated at 20V d.c. 

My question is , could I use the WG22 device on 24GHZ using suitable adaptors ?

If so has anyone got any data on suitable adaptors ?

 

73

John

G0API

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: Waveguide switch replacement

Paul G8KFW
 

Hi john

I think Mike and I have hade the same positive experience with using WG 22 at 24 Ghz

 

Regarding spectrum analysers

Yes the 21 GHz    HP 8559 analysers work fine at 24GHz, as that is what I  used for the 24 ghz  FM  TV link I demonstrated at a BATC convention some 30 plus years ago

The old  HP 18 ghz  in the  140 main frame also works OK at 24 ghz using a WG 22 external mixer  

 

Regarding power measurements the WG 22  HP power sensors are useable at 24 Ghz

 

Just as a side question what is your approximate location  

Paul B

 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Mike Willis
Sent: 01 February 2019 11:52
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Waveguide switch replacement

 

WG22 is recommended for 26GHz-40GHz but it is still well above cut-off at 24GHz. I think the New Zealand relays  Iam using are WG22. I simply connected them together directly, by filing slots in the WG20 flange because the hole spacing is different. I used 3 fine screws to tune out the miss-match in the usual manner. It should work OK for narrow bandwidths. If you don't have a 24 GHz VSWR meter or VNA, just use a directional coupler and a sensitive detector (e.g. a spectrum analyser or a crystal detector). The old 22GHz HP8559 analysers work fine at 24GHz, they are un-calibrated but you are only looking for a null.
--
Mike G0MJW

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: Odd effect whilst testing LNBs

Richard <richard@...>
 

Does this mean when a sat tumbles there shouldn't be any change in freq as no gravity
Richard

Sent from my Sony Xperia™ smartphone

---- Mike Willis wrote ----

Must be gravity then. Try with a small neutron star?
--
Mike G0MJW


Re: Octagon LNB

Mike Willis
 

Not had a lot of success with the TCXO. I do have a PCB for it though. It is accurate but keeps wandering off to either side and coming back.
--
Mike G0MJW


Re: Odd effect whilst testing LNBs

Mike Willis
 

Must be gravity then. Try with a small neutron star?
--
Mike G0MJW


Re: Waveguide switch replacement

Mike Willis
 

WG22 is recommended for 26GHz-40GHz but it is still well above cut-off at 24GHz. I think the New Zealand relays  Iam using are WG22. I simply connected them together directly, by filing slots in the WG20 flange because the hole spacing is different. I used 3 fine screws to tune out the miss-match in the usual manner. It should work OK for narrow bandwidths. If you don't have a 24 GHz VSWR meter or VNA, just use a directional coupler and a sensitive detector (e.g. a spectrum analyser or a crystal detector). The old 22GHz HP8559 analysers work fine at 24GHz, they are un-calibrated but you are only looking for a null.
--
Mike G0MJW

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