Date   

Re: SGLabs 3.4GHz delivery latest

ian hope (2E0IJH)
 

9cm is somthing yet to dabble would be interested in your results, I have the 23 and 13cm SG labs units and the matching amps, but currently not active on them, until I replace the mast they were on, 
 
Ian
M5IJH

 
 
Sent: Sunday, December 06, 2020 at 7:18 PM
From: "SAM JEWELL via groups.io" <jewell@...>
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] SGLabs 3.4GHz delivery latest
Colin,
It will be interesting to see how well it works over our 10-12km NLOS path with low/moderate power.
As far as I know, there is yourself, plus G3XDY and G4FSG locally. I am not sure G3LQR is operational any longer.
G4BAO is around 70km from me and I have worked him on 9cm a number of times, previously.
To the south, G4OGI in Kent, is active on 9cm. I am sure there are many others who are, are were, active within 100km of us.
Much, much, greater ranges are possible, of course, but it always helps to have someone local to test with, first.
 
73 de Sam, G4DDK
 
 
 
 
 
 
 
On 6 Dec 2020, at 18:55, Colin Ranson <g8lbs@...> wrote:
 


Great stuff Sam !

 

Now engineering up a Hammond box here to match the other two SG-labs transverter and the Iceni.  It used to house a dual band Ukrainian transverter but the box was wasted on that ! I’ll pass that on to a local who can be bothered to use a proper mode.   Priority after that will be an ABS box tucked under the soffits on the shop side with amp/LNA in it

Beauty of 9cm is the smallness of antennas, I am going to try and re-engineer the 2.4GHz TP-Link feed for 9cm as one project, including getting the 73 ele QLY up. 

Father Xmas might bring me a suitable VNA soon as well.

 

Already mounted the supplied PCB antenna in the East facing window looking at you and John and Martleshambles.

 

Regards

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: SAM JEWELL via groups.io
Sent: 06 December 2020 17:35
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] SGLabs 3.4GHz delivery latest

 

DPD are telling me my transverter will be delivered tomorrow.

Now I have to decide whether to use this one on terrestrial or reuse the G2 Kuhne one, but with the new, external, LO to keep it from drifting.........drift was a real pain, previously.

Reusing the Kuhne does have the advantage that it has a 2m IF and is already suitably boxed with LNA power feed, sequencing, etc.

The disadvantage is that I have to reengineer the EME system for a 70cm IF, using the SGLabs one.

Decisions........

Whichever way I choose, I hope to have something operational around Christmas, even if only low powered, to work the locals........at least three within 10km. And a local beacon to listen to. Plenty of incentive.

I do have a suitable linear, LNA and high gain QLY! but I don't see these re-entering service for a while longer.

 

73 de Sam, G4DDK

 

 

 

 


 

 

 

 


Re: SGLabs 3.4GHz delivery latest

SAM JEWELL
 

Colin,
It will be interesting to see how well it works over our 10-12km NLOS path with low/moderate power.
As far as I know, there is yourself, plus G3XDY and G4FSG locally. I am not sure G3LQR is operational any longer.
G4BAO is around 70km from me and I have worked him on 9cm a number of times, previously.
To the south, G4OGI in Kent, is active on 9cm. I am sure there are many others who are, are were, active within 100km of us.
Much, much, greater ranges are possible, of course, but it always helps to have someone local to test with, first.

73 de Sam, G4DDK







On 6 Dec 2020, at 18:55, Colin Ranson <g8lbs@...> wrote:



Great stuff Sam !

 

Now engineering up a Hammond box here to match the other two SG-labs transverter and the Iceni.  It used to house a dual band Ukrainian transverter but the box was wasted on that ! I’ll pass that on to a local who can be bothered to use a proper mode.   Priority after that will be an ABS box tucked under the soffits on the shop side with amp/LNA in it

Beauty of 9cm is the smallness of antennas, I am going to try and re-engineer the 2.4GHz TP-Link feed for 9cm as one project, including getting the 73 ele QLY up. 

Father Xmas might bring me a suitable VNA soon as well.

 

Already mounted the supplied PCB antenna in the East facing window looking at you and John and Martleshambles.

 

Regards

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: SAM JEWELL via groups.io
Sent: 06 December 2020 17:35
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] SGLabs 3.4GHz delivery latest

 

DPD are telling me my transverter will be delivered tomorrow.

Now I have to decide whether to use this one on terrestrial or reuse the G2 Kuhne one, but with the new, external, LO to keep it from drifting.........drift was a real pain, previously.

Reusing the Kuhne does have the advantage that it has a 2m IF and is already suitably boxed with LNA power feed, sequencing, etc.

The disadvantage is that I have to reengineer the EME system for a 70cm IF, using the SGLabs one.

Decisions........

Whichever way I choose, I hope to have something operational around Christmas, even if only low powered, to work the locals........at least three within 10km. And a local beacon to listen to. Plenty of incentive.

I do have a suitable linear, LNA and high gain QLY! but I don't see these re-entering service for a while longer.

 

73 de Sam, G4DDK

 

 

 

 



 

 


Re: 3.4G feed horn dimensions ?

Eddie G0EHV
 

Try eBay, “c band LNB”

Regards,
Eddie 
G0EHV 

Launched into the ether from my iPad 

On 6 Dec 2020, at 18:56, Colin Ranson <g8lbs@...> wrote:

uW’ers

 

Where does one acquire on of these white Chapparral thingys ?

 

Colin de G8LBS  ..... ....pondering different antennas for 9cm.

 

Sent from Mail for Windows 10

 

From: John Fell
Sent: 06 December 2020 15:02
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 3.4G feed horn dimensions ?

 

Nick,

The standard tin length is good enough - the probe point to the end short of the waveguide ( Tin can) is more important .

No doubt Peter's data will be fine .

The Chaparral flange addition is to enforce a better distribution  illumination of the dish surface for higher F/d ratio .

 

The open ended can without any flange addition will work fine with a near prime (0.25 F/d ratio ) reflector , which requires near to 90 degree feed angle .

 

An alternative , easier to make , flange is a Super VE4MA .This works well with dishes in  the 0.55 to 0.8F/d range , such as the majority of domestic  Sat dishes .It is also possible to adjust the flange position although the data given on the W1GHZ website is close enough to fix the position .

 

73/Seasons Greetings 

 

John

G0API

 

On Sun, 6 Dec 2020 at 14:34, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> wrote:

The 9cm's SG-Labs arrived yesterday and I'm cant wait to get going.

I've found on the G3PHO site a "Soup Tin" feed horn.

I've copied it and the SWR is in the green straight away :)

But what length should I make the waveguide section, it is not mentioned in the article ?

And what does a Chaparral horn actually do ?

Nick G0HIK
 






<IMG_20201206_141909475.jpg><IMG_20201206_141924969.jpg>

 


Re: 3.4G feed horn dimensions ?

Colin Ranson
 

uW’ers

 

Where does one acquire on of these white Chapparral thingys ?

 

Colin de G8LBS  ..... ....pondering different antennas for 9cm.

 

Sent from Mail for Windows 10

 

From: John Fell
Sent: 06 December 2020 15:02
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 3.4G feed horn dimensions ?

 

Nick,

The standard tin length is good enough - the probe point to the end short of the waveguide ( Tin can) is more important .

No doubt Peter's data will be fine .

The Chaparral flange addition is to enforce a better distribution  illumination of the dish surface for higher F/d ratio .

 

The open ended can without any flange addition will work fine with a near prime (0.25 F/d ratio ) reflector , which requires near to 90 degree feed angle .

 

An alternative , easier to make , flange is a Super VE4MA .This works well with dishes in  the 0.55 to 0.8F/d range , such as the majority of domestic  Sat dishes .It is also possible to adjust the flange position although the data given on the W1GHZ website is close enough to fix the position .

 

73/Seasons Greetings 

 

John

G0API

 

On Sun, 6 Dec 2020 at 14:34, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> wrote:

The 9cm's SG-Labs arrived yesterday and I'm cant wait to get going.

I've found on the G3PHO site a "Soup Tin" feed horn.

I've copied it and the SWR is in the green straight away :)

But what length should I make the waveguide section, it is not mentioned in the article ?

And what does a Chaparral horn actually do ?

Nick G0HIK
 






 


Re: SGLabs 3.4GHz delivery latest

Colin Ranson
 

Great stuff Sam !

 

Now engineering up a Hammond box here to match the other two SG-labs transverter and the Iceni.  It used to house a dual band Ukrainian transverter but the box was wasted on that ! I’ll pass that on to a local who can be bothered to use a proper mode.   Priority after that will be an ABS box tucked under the soffits on the shop side with amp/LNA in it

Beauty of 9cm is the smallness of antennas, I am going to try and re-engineer the 2.4GHz TP-Link feed for 9cm as one project, including getting the 73 ele QLY up. 

Father Xmas might bring me a suitable VNA soon as well.

 

Already mounted the supplied PCB antenna in the East facing window looking at you and John and Martleshambles.

 

Regards

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: SAM JEWELL via groups.io
Sent: 06 December 2020 17:35
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] SGLabs 3.4GHz delivery latest

 

DPD are telling me my transverter will be delivered tomorrow.

Now I have to decide whether to use this one on terrestrial or reuse the G2 Kuhne one, but with the new, external, LO to keep it from drifting.........drift was a real pain, previously.

Reusing the Kuhne does have the advantage that it has a 2m IF and is already suitably boxed with LNA power feed, sequencing, etc.

The disadvantage is that I have to reengineer the EME system for a 70cm IF, using the SGLabs one.

Decisions........

Whichever way I choose, I hope to have something operational around Christmas, even if only low powered, to work the locals........at least three within 10km. And a local beacon to listen to. Plenty of incentive.

I do have a suitable linear, LNA and high gain QLY! but I don't see these re-entering service for a while longer.

 

73 de Sam, G4DDK

 

 

 

 



 

 


Re: Modifying a POTY dish feed

Andrew G8TZJ
 

On Thu, Nov 26, 2020 at 09:45 AM, Mike Willis wrote:
What you have drawn looks good. It might benefit from a tuning screw.

Mike G0MJW
I assume that the tuning screw needs to go on the opposite side of the waveguide to the pick-up probe, with the pick-up probe being made slightly short? Should the screw be a steel or brass type?

73 Andrew G8TZJ


SGLabs 3.4GHz delivery latest

SAM JEWELL
 

DPD are telling me my transverter will be delivered tomorrow.
Now I have to decide whether to use this one on terrestrial or reuse the G2 Kuhne one, but with the new, external, LO to keep it from drifting.........drift was a real pain, previously.
Reusing the Kuhne does have the advantage that it has a 2m IF and is already suitably boxed with LNA power feed, sequencing, etc.
The disadvantage is that I have to reengineer the EME system for a 70cm IF, using the SGLabs one.
Decisions........
Whichever way I choose, I hope to have something operational around Christmas, even if only low powered, to work the locals........at least three within 10km. And a local beacon to listen to. Plenty of incentive.
I do have a suitable linear, LNA and high gain QLY! but I don't see these re-entering service for a while longer.

73 de Sam, G4DDK








UKuG Talk on NanoVNAs by G8DKK - 20:00 Wednesday 9th December

John Quarmby
 

A Comparison of NanoVNAs – By Bryan Harber G8DKK

A UK Microwave Group Online Lecture streamed by the BATC

Wednesday 9th December 2020 at 20:00

Bryan will be comparing with other Vector Network Analysers and looking at VNA architecture and calibration kits. The talk will be streamed on this URL:

https://batc.org.uk/live/ukmicrowave

We look forward to welcoming all to the talk.

Please put the 13th January 2021 in your diary for the next talk in this series.


73

John G3XDY
Secretary, UKuG


Virus-free. www.avast.com


Re: 3.4G feed horn dimensions ?

Nick Gregory G0HIK
 

Nice Ben,

What is the diameter of your horn? And what function does the flare serve.

If I get this working, I'll be asking you for a sked soon :)

Nick G0HIK


Re: Mere 23cm beacon?

Robin Szemeti - G1YFG
 

Noted.   I may include a "beacons" layer in the mapping on my KST variant.   It would be nice if either of those sites provided beacon data in JSON format,  would save scraping it.

On Sun, 6 Dec 2020 at 15:50, Murray Niman <g6jyb@...> wrote:
For info the static maps on microwavers.org are what are licensed (though may not be great for operational state) and tie up closely with the official data/coordinates on ETCC ukrepeaters.net 

Whereas beaconspot very usefully filters current spot reports (but may not have precise source/keeper data; and can inadvertently omit/include a few extra systems)

Most UK beacons completed their 3yr NoV renewals earlier this year (or were removed if expired), so the RSGB-ETCC licensing info is in a pretty good state. Covid has been hampering site access for some though, so bear that in mind 

73

   Murray G6JYB


--
Robin Szemeti - G1YFG


Re: Mere 23cm beacon?

Murray Niman
 

For info the static maps on microwavers.org are what are licensed (though may not be great for operational state) and tie up closely with the official data/coordinates on ETCC ukrepeaters.net 

Whereas beaconspot very usefully filters current spot reports (but may not have precise source/keeper data; and can inadvertently omit/include a few extra systems)

Most UK beacons completed their 3yr NoV renewals earlier this year (or were removed if expired), so the RSGB-ETCC licensing info is in a pretty good state. Covid has been hampering site access for some though, so bear that in mind 

73

   Murray G6JYB


Re: 3.4G feed horn dimensions ?

Neil Smith G4DBN
 

A simple round horn has a wide pattern and large side/back lobes, so it doesn't illuminate a shallow dish very effectively. That means the horn is probably seeing hot ground, as well as lowering the efficiency of the dish/feed system.

Fitting a choke ring or rings suppresses the sidelobes and helps narrow the pattern somewhat. 

The section of guide ahead of the probe helps to ensure that higher modes are suppressed and that the wavefronts coming out of the tube are pretty much planar so you will get an in-phase reflection across the whole of the dish. Rule of thumb is at least half a waveguide wavelength between the probe and the open end, but you can model it in OpenEMS or something to be sure.

The VE4MA style chokes are much simpler to make (and smaller) than a Chaparral, and you can adjust the width, depth and offset from the open end of the tube to fine-tune the pattern and sidelobe suppression.  W1GHZ's site has a lot of analysis of how to match the choke topology to your dish f/d. On a prime-focus dish, you have to take into account the extra blockage caused by the choke. http://www.w1ghz.org/antbook/chap6-3.pdf and there are good articles in DUBUS.

Without a choke ring, if your dish has an f/d of less than 0.4, you won't lose much on transmit, but you might have a little extra noise on receive. If you are using an offset with f/.d 0.6-0.8 then it is probably worth fitting a choke. It won't make any noticeable difference to the match.

A VE4MA choke ring looks like this, although I usually TIG-weld the rings to the horn - this one needed to be removable for fitting:

Fitting a scalar choke like this one (similar to the Chaparral in concept, providing a high-impedance surface of 1/4-wave (ish) slots) does clean up the pattern very well, but the blockage is too high for a small PF dish under 1.5 m or a 1.2 m offset

Neil G4DBN

On 06/12/2020 14:34, Nick Gregory G0HIK via groups.io wrote:
The 9cm's SG-Labs arrived yesterday and I'm cant wait to get going.

I've found on the G3PHO site a "Soup Tin" feed horn.

I've copied it and the SWR is in the green straight away :)

But what length should I make the waveguide section, it is not mentioned in the article ?

And what does a Chaparral horn actually do ?

Nick G0HIK
 






-- 
Neil
http://g4dbn.uk


Re: 3.4G feed horn dimensions ?

militaryoperator
 


Mine Nick. 


Ben G4BXD.




Subject: [UKMicrowaves] 3.4G feed horn dimensions ?
The 9cm's SG-Labs arrived yesterday and I'm cant wait to get going.
I've found on the G3PHO site a "Soup Tin" feed horn.
I've copied it and the SWR is in the green straight away :)
But what length should I make the waveguide section, it is not mentioned in the article ?
And what does a Chaparral horn actually do ?
Nick G0HIK


 





Re: 3.4G feed horn dimensions ?

Nick Gregory G0HIK
 

Thanks John,

That is just the simple to understand information I needed.

I'll try it with just the open ended can first then.

Nick G0HIK


Re: 3.4G feed horn dimensions ?

John Fell
 

Nick,
The standard tin length is good enough - the probe point to the end short of the waveguide ( Tin can) is more important .
No doubt Peter's data will be fine .
The Chaparral flange addition is to enforce a better distribution  illumination of the dish surface for higher F/d ratio .

The open ended can without any flange addition will work fine with a near prime (0.25 F/d ratio ) reflector , which requires near to 90 degree feed angle .

An alternative , easier to make , flange is a Super VE4MA .This works well with dishes in  the 0.55 to 0.8F/d range , such as the majority of domestic  Sat dishes .It is also possible to adjust the flange position although the data given on the W1GHZ website is close enough to fix the position .

73/Seasons Greetings 

John
G0API

On Sun, 6 Dec 2020 at 14:34, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> wrote:
The 9cm's SG-Labs arrived yesterday and I'm cant wait to get going.

I've found on the G3PHO site a "Soup Tin" feed horn.

I've copied it and the SWR is in the green straight away :)

But what length should I make the waveguide section, it is not mentioned in the article ?

And what does a Chaparral horn actually do ?

Nick G0HIK
 







3.4G feed horn dimensions ?

Nick Gregory G0HIK
 

The 9cm's SG-Labs arrived yesterday and I'm cant wait to get going.

I've found on the G3PHO site a "Soup Tin" feed horn.

I've copied it and the SWR is in the green straight away :)

But what length should I make the waveguide section, it is not mentioned in the article ?

And what does a Chaparral horn actually do ?

Nick G0HIK
 







Re: 3.4G

DF6NA Rainer
 

Hi,

just look for these ANAREN 1H0566-3. They are good for 100W from 2-4GHz.

73, Rainer



Am 06.12.2020 um 11:09 schrieb Colin Ranson:

Stuart, Hi,

 

I have a few of these for 2.3-2.7GHz,  same manufacturer, but I did not think they would handle high power......   up to 70W as the ones you list.

 

Thanks for the attention

 

Regards

 

Colin.

 

Sent from Mail for Windows 10

 

From: Stuart G1ZAR
Sent: 06 December 2020 10:00
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 3.4G

 

Could you use one of the surface mount type couplers such as Anaran XC3500M  or similar higher power unit.
What would be involved in making a suitable PCB? or am I looking at the wrong item entirely?

regards.............Stuart

 



Re: Mere 23cm beacon?

Robin Szemeti - G1YFG
 

Its the only 23cm beacon I can hear normally!   Considering I am off the back of the dish ...

On Sun, 6 Dec 2020 at 10:05, Graham G3TCT <g3tct@...> wrote:
GB3USK is indeed off at the moment, don't panic!  It is solar powered. 
The combination of short days, 8/8 cloud and reduced battery capacity at
low temperatures means the months of December and January are
difficult.  It will re-appear from time to time during this period, but
rather unreliable.

Good to know it's useful when it's on though!  It was a good signal on
the Gerbrandy websdr last Sunday.

73
Graham






--
Robin Szemeti - G1YFG


Re: 3.4G

Colin Ranson
 

Stuart, Hi,

 

I have a few of these for 2.3-2.7GHz,  same manufacturer, but I did not think they would handle high power......   up to 70W as the ones you list.

 

Thanks for the attention

 

Regards

 

Colin.

 

Sent from Mail for Windows 10

 

From: Stuart G1ZAR
Sent: 06 December 2020 10:00
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 3.4G

 

Could you use one of the surface mount type couplers such as Anaran XC3500M  or similar higher power unit.
What would be involved in making a suitable PCB? or am I looking at the wrong item entirely?

regards.............Stuart

 


Re: Mere 23cm beacon?

Graham G3TCT
 

GB3USK is indeed off at the moment, don't panic! It is solar powered. The combination of short days, 8/8 cloud and reduced battery capacity at low temperatures means the months of December and January are difficult. It will re-appear from time to time during this period, but rather unreliable.

Good to know it's useful when it's on though! It was a good signal on the Gerbrandy websdr last Sunday.

73
Graham

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