Date   

Re: Tentative group purchase of PCBs for F6BVA QO-100 3/13cm system

Conrad, PA5Y
 

Neil, I have a set of boards but would be interested in a set of components and cases. Maybe I will then get around to building the thing!

Conrad


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Neil Smith G4DBN via groups.io <neil@...>
Sent: 12 March 2021 13:08
To: BVA-transverters-uk@groups.io <BVA-transverters-uk@groups.io>; RSGB-Workshop@groups.io <RSGB-Workshop@groups.io>; UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: [UKMicrowaves] Tentative group purchase of PCBs for F6BVA QO-100 3/13cm system
 
Our good friends in France are looking into the possibility of a group
purchase of PCBs for Michel's QO-100 system, which is a receive
converter for 3cm and transmit converter to 13cm from 2m/70cm/23cm,
avoiding the need for an SDR and LNB on receive if you prefer to use a
normal VHF radio on QO100.

I'm going to order a couple of boards for myself. Is anyone else
interested?  I would be happy to facilitate the group purchase of
boards, cases and components as for the 3cm-UHF transverters.

Have a read of the project description.  Note that it needs a local osc
(an SV1AFN 4351/controller is fine for this) and is designed to power a
PA using an MW7ic2725, for which a PCB will be produced as part of the
group purchase.  I already have some MW7ic2725s for myself.  They are
available on ebay and other dodgy sites. Richardson RFPD have some in
stock at $53 but then there is VAT and carriage and other malarkey.

Here is the description:

https://f6bva.pagesperso-orange.fr/Technique/Satellite/Station%20V3%20QO100%20complete.pdf

Google Translate is your friend if you don't read French. Just remember
that FI = IF, CI = PCB, OL = LO. If you need anything else decoding,
please send me an email to neil@...

Please reply to me privately to neil@... with email title QO100 so
I can gauge the likely demand.  Price is likely to be around £40 for the
PCBs. I haven't costed component sets, but there isn't anything unusual
in there. If there is any interest, I'll work out a more accurate cost
and ask for firm commitments to place an order for the PCBs via
Pierre-François.

Everything depends on there being sufficient demand for a PCB order,
this is *very* tentative at present.

Neil G4DBN









Re: Wavelab 2W 24Ghz TRV

Colin Ranson
 

Robin,   the only light these days at the end of the tunnel is a burglars torch ! or so it seems.

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: Robin Szemeti - G1YFG
Sent: 12 March 2021 00:23
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Wavelab 2W 24Ghz TRV

 

I'm way WAY behind on amatuery stuff at the moment, far too much "other" work came along, there is howwver some light at the end of the tunnel ... I'm just worried it might be some git with a torch bringing more work.

 

I was actually thinking a nice idea would be a single board, with the PSU and connectors built into the same PCB, avoiding the interconnects which are the prime source of failure.

 

I had a 5.7GHz amp turn up about 2 weeks ago, not found time to test it yet ... missed the recent UKAC contests as well.  I hope to be able to turn my attention back to radio this weekend, with a little luck!

 

On Thu, 11 Mar 2021 at 23:51, Neil Smith G4DBN <neil@...> wrote:

I didn't spot any Gerbers for those, but I guess Staszek will know if they are available. I'd like two of the power PCBs if you can get the files in time to go with your order, otherwise I'll be putting in another order at the weekend. I was trying to place an order on Farnell for some parts, but their website is down for maintenance. RS don't seem to do small quantities of those 20021111-00020T4LF Amphenol headers. Digikey have them, but I'd hope Farnell might as well.

Neil

On 11/03/2021 23:29, Robin Szemeti - G1YFG wrote:

I'll have one please ... I have a large (about 300 pieces) order for all sorts of boards, going into JLC tomorrow.  I'll see if the regulator board is
available as gerbers too, happy to order some.

 

On Thu, 11 Mar 2021 at 21:35, Neil Smith G4DBN <neil@...> wrote:

I've ordered ten PCB sets for the interfaces to the Wavelab units from
JLC if anyone else in the UK needs some. £2.30 each with ENIG.

Thanks to Staszek for pointing us to the Gerbers.

Neil G4DBN

 


--
Robin Szemeti - G1YFG

 


Tentative group purchase of PCBs for F6BVA QO-100 3/13cm system

Neil Smith G4DBN
 

Our good friends in France are looking into the possibility of a group purchase of PCBs for Michel's QO-100 system, which is a receive converter for 3cm and transmit converter to 13cm from 2m/70cm/23cm, avoiding the need for an SDR and LNB on receive if you prefer to use a normal VHF radio on QO100.

I'm going to order a couple of boards for myself. Is anyone else interested?  I would be happy to facilitate the group purchase of boards, cases and components as for the 3cm-UHF transverters.

Have a read of the project description.  Note that it needs a local osc (an SV1AFN 4351/controller is fine for this) and is designed to power a PA using an MW7ic2725, for which a PCB will be produced as part of the group purchase.  I already have some MW7ic2725s for myself.  They are available on ebay and other dodgy sites. Richardson RFPD have some in stock at $53 but then there is VAT and carriage and other malarkey.

Here is the description:

https://f6bva.pagesperso-orange.fr/Technique/Satellite/Station%20V3%20QO100%20complete.pdf

Google Translate is your friend if you don't read French. Just remember that FI = IF, CI = PCB, OL = LO. If you need anything else decoding, please send me an email to neil@g4dbn.uk

Please reply to me privately to neil@g4dbn.uk with email title QO100 so I can gauge the likely demand.  Price is likely to be around £40 for the PCBs. I haven't costed component sets, but there isn't anything unusual in there. If there is any interest, I'll work out a more accurate cost and ask for firm commitments to place an order for the PCBs via Pierre-François.

Everything depends on there being sufficient demand for a PCB order, this is *very* tentative at present.

Neil G4DBN


Re: Wavelab 2W 24Ghz TRV

Robin Szemeti - G1YFG
 

I'm way WAY behind on amatuery stuff at the moment, far too much "other" work came along, there is howwver some light at the end of the tunnel ... I'm just worried it might be some git with a torch bringing more work.

I was actually thinking a nice idea would be a single board, with the PSU and connectors built into the same PCB, avoiding the interconnects which are the prime source of failure.

I had a 5.7GHz amp turn up about 2 weeks ago, not found time to test it yet ... missed the recent UKAC contests as well.  I hope to be able to turn my attention back to radio this weekend, with a little luck!


On Thu, 11 Mar 2021 at 23:51, Neil Smith G4DBN <neil@...> wrote:

I didn't spot any Gerbers for those, but I guess Staszek will know if they are available. I'd like two of the power PCBs if you can get the files in time to go with your order, otherwise I'll be putting in another order at the weekend. I was trying to place an order on Farnell for some parts, but their website is down for maintenance. RS don't seem to do small quantities of those 20021111-00020T4LF Amphenol headers. Digikey have them, but I'd hope Farnell might as well.

Neil

On 11/03/2021 23:29, Robin Szemeti - G1YFG wrote:
I'll have one please ... I have a large (about 300 pieces) order for all sorts of boards, going into JLC tomorrow.  I'll see if the regulator board is
available as gerbers too, happy to order some.

On Thu, 11 Mar 2021 at 21:35, Neil Smith G4DBN <neil@...> wrote:
I've ordered ten PCB sets for the interfaces to the Wavelab units from
JLC if anyone else in the UK needs some. £2.30 each with ENIG.

Thanks to Staszek for pointing us to the Gerbers.

Neil G4DBN


--
Robin Szemeti - G1YFG


Re: Wavelab 2W 24Ghz TRV

Neil Smith G4DBN
 

I didn't spot any Gerbers for those, but I guess Staszek will know if they are available. I'd like two of the power PCBs if you can get the files in time to go with your order, otherwise I'll be putting in another order at the weekend. I was trying to place an order on Farnell for some parts, but their website is down for maintenance. RS don't seem to do small quantities of those 20021111-00020T4LF Amphenol headers. Digikey have them, but I'd hope Farnell might as well.

Neil

On 11/03/2021 23:29, Robin Szemeti - G1YFG wrote:
I'll have one please ... I have a large (about 300 pieces) order for all sorts of boards, going into JLC tomorrow.  I'll see if the regulator board is
available as gerbers too, happy to order some.

On Thu, 11 Mar 2021 at 21:35, Neil Smith G4DBN <neil@...> wrote:
I've ordered ten PCB sets for the interfaces to the Wavelab units from
JLC if anyone else in the UK needs some. £2.30 each with ENIG.

Thanks to Staszek for pointing us to the Gerbers.

Neil G4DBN


Re: Wavelab 2W 24Ghz TRV

Robin Szemeti - G1YFG
 

I'll have one please ... I have a large (about 300 pieces) order for all sorts of boards, going into JLC tomorrow.  I'll see if the regulator board is
available as gerbers too, happy to order some.

On Thu, 11 Mar 2021 at 21:35, Neil Smith G4DBN <neil@...> wrote:
I've ordered ten PCB sets for the interfaces to the Wavelab units from
JLC if anyone else in the UK needs some. £2.30 each with ENIG.

Thanks to Staszek for pointing us to the Gerbers.

Neil G4DBN








--
Robin Szemeti - G1YFG


Re: Wavelab 2W 24Ghz TRV

Neil Smith G4DBN
 

I've ordered ten PCB sets for the interfaces to the Wavelab units from JLC if anyone else in the UK needs some. £2.30 each with ENIG.

Thanks to Staszek for pointing us to the Gerbers.

Neil G4DBN


Re: Wavelab 2W 24Ghz TRV

Neil Smith G4DBN
 

Yes, I always forget that!

Thanks, Neil

On 11/03/2021 20:42, Stanislaw Ziemczonek wrote:
 Neil ,
you sent image 191 kB, we got 33.9 kB low resolution.
Ukmicrowave reduces your attachments 6 times, the same happened with my attachments.
here are files high resolution:
http://mikrofale.cafe/showthread.php?tid=197&pid=672#pid672


Re: Wavelab 2W 24Ghz TRV

Stanislaw Ziemczonek
 

 Neil ,
you sent image 191 kB, we got 33.9 kB low resolution.
Ukmicrowave reduces your attachments 6 times, the same happened with my attachments.
here are files high resolution:
http://mikrofale.cafe/showthread.php?tid=197&pid=672#pid672
73's de Staszek SP6GWB

Hi Steve, higher-res image attached.

Neil G4DBN

On 11/03/2021 19:55, Steve G4KNZ wrote:

The circuit diagram above is quite low resolution and difficult to read, if there is any chance of a higher resolution one?








Re: Dish for 10GHz.

Nigel G8IFN
 

The Satgear 40cm dish is available on ebay without LNB for £28.75
Satgear 40cm Circular Satellite Dish - Dark Grey 5060308357645 | eBay
--
Nigel G8IFN - JO01LS


Re: Wavelab 2W 24Ghz TRV

Steve G4KNZ
 

The circuit diagram above is quite low resolution and difficult to read, if there is any chance of a higher resolution one?

I've seen the annotated photo, also noted not to attempt to open the housing, and the warning about the -5V.

I'm guessing the connection board from SP1GQC is the one referred to in the eBay.pl listing as being developed?
In which case, perhaps there will also be an eBay listing to order one!

73 Steve G4KNZ.


Re: Wavelab 2W 24Ghz TRV

Marek SP4ELF
 

Hello all
Pawel SQ1GQC posted links to the files on the Polish discussion forum ( http://mikrofale.cafe/showthread.php?tid=197&pid=672#pid672 ).
You can order them yourself for example in JLCPCB. Use 1mm thick laminate. Link to gerber files:
( http://procontrol.home.pl/pawel/Wavelab/Wavelab24GHz_boards.zip )

73 Marek SP4ELF


Re: Wavelab 2W 24Ghz TRV

Stanislaw Ziemczonek
 

 Steve ,
I am attaching a connection diagram by Paweł SP1GQC to each of the three connectors for his board design.

I also warn you against opening the TRV housing, which tends to oscillate on Tx after this operation,
as well as the sequence of voltage switching:
+5 V
an oscillator circuit and  -5V
+5 V
the rest of the oscillator path and part of the tx path
+6 V for PA
as it is described in the picture https://salwach.pl/img/SQ6QV/24g_trv.jpg

73's de Staszek SP6GWB

I agree, these boards from Pawel SP1GQC look excellent, I just need to know how I can order a set?


Re: Wavelab 2W 24Ghz TRV

Steve G4KNZ
 

I agree, these boards from Pawel SP1GQC look excellent, I just need to know how I can order a set?


Re: Wavelab 2W 24Ghz TRV

Neil Smith G4DBN
 

Those boards are an excellent solution Staszek.

73 Neil

On 11/03/2021 16:20, Stanislaw Ziemczonek wrote:
 Steve  ,
I use it:
https://www.tme.eu/pl/details/20021111-00020t4lf/listwy-i-gniazda-kolkowe/amphenol/
I will probably order a PCB suitable for each 2x10 pin socket, whose design was made by Pawel SP1GQC,
as in the attachment to the e-mail.
73's de Staszek SP6GWB
I ordered one, which arrived today (just arrived, no fee or VAT to pay at least so far).
The PCB connectors appear to be 20-way (2x10way) 1.27mm pitch female, does anyone happen to know the correct or an appropriate part to mate with these?

Steve G4KNZ

-- 
Neil
http://g4dbn.uk


Re: Wavelab 2W 24Ghz TRV

Stanislaw Ziemczonek
 

 Steve  ,
I use it:
https://www.tme.eu/pl/details/20021111-00020t4lf/listwy-i-gniazda-kolkowe/amphenol/
I will probably order a PCB suitable for each 2x10 pin socket, whose design was made by Pawel SP1GQC,
as in the attachment to the e-mail.
73's de Staszek SP6GWB

I ordered one, which arrived today (just arrived, no fee or VAT to pay at least so far).
The PCB connectors appear to be 20-way (2x10way) 1.27mm pitch female, does anyone happen to know the correct or an appropriate part to mate with these?

Steve G4KNZ


Re: Dish for 10GHz.

Neil Smith G4DBN
 

Satgear.co.uk do a 40cm dish, you get an LNB with it, not sure if you can get the dish alone. Gibertini 60cm dishes from Hisat are always good. Illuminating a Sky oval 60 x 45 dish isn't quite as easy a normal offset, but they are very cheap. 40cm is going to get you around 30 dBi, a 60cm around 34 dBi. A smaller dish that you can use when it is windy is going to outperform a big one that you can't get up in the clear.

My 95cm dish is scary at 13 metres on a breezy day, but probably gets me 37 dBi.

40cm is getting close to the lower limit at 10 GHz, but diffraction losses won't be noticeable at that diameter.

Neil G4DBN

On 11/03/2021 14:48, Colin Ranson wrote:

Now that the 3cm transverters will soon be available, and many thanks to Neil for his hard work, I guess we will all have to start thinking antennas. Some of us will no doubt already be there, but I have to start thinking of options.  I intend to start small, with a 125mW amplifier/LNA/relays in a plastic box under the feed horn support arm with the transverter in the loft/shack.  And also by small I mean the dish – how rare are 40cm round offset dishes it seems ? and how much gain can I expect from a 40cm dish alone ? The ones I’ve seen are hugely expensive.  The feed is still under consideration as is a standard Zone one elliptical. I really need to keep it small as there is already a Sky dish on the building as well as a QO-100 1m dish round the other side. I am hoping it will share a bit of space under my 9cm QLY.

 

Thoughts appreciated please.

 

73’s and thanks

 

Colin de G8LBS.

 



Dish for 10GHz.

Colin Ranson
 

Now that the 3cm transverters will soon be available, and many thanks to Neil for his hard work, I guess we will all have to start thinking antennas. Some of us will no doubt already be there, but I have to start thinking of options.  I intend to start small, with a 125mW amplifier/LNA/relays in a plastic box under the feed horn support arm with the transverter in the loft/shack.  And also by small I mean the dish – how rare are 40cm round offset dishes it seems ? and how much gain can I expect from a 40cm dish alone ? The ones I’ve seen are hugely expensive.  The feed is still under consideration as is a standard Zone one elliptical. I really need to keep it small as there is already a Sky dish on the building as well as a QO-100 1m dish round the other side. I am hoping it will share a bit of space under my 9cm QLY.

 

Thoughts appreciated please.

 

73’s and thanks

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 


Re: Calculating the impedance of a dielectric rod in free space to get a match to 377 ohms?

Neil Smith G4DBN
 

Certainly adding a choke ring lets me clean up the sidelobes radically, as does converting the design to a non-lensed Pickett-Potter or W2IMU, but my primary intent was to make a lens horn that can be mounted very close to a 5.6 GHz horn on the same dish, so keeping the outside diameter under 25mm would be good.

I think I've found another paper about characteristic impedance of an unenclosed dielectric guide, although it is densely mathematical, so I need a good night's sleep before reading it. If it makes any sense to me, I'll add a link to it on the UKuG wiki and write a covering page.

Neil

On 11/03/2021 13:22, Mike Willis wrote:
Try a pie tin (aka Chaparral ring) as it will help reduce sidelobes
--


Re: Calculating the impedance of a dielectric rod in free space to get a match to 377 ohms?

Mike Willis
 

Try a pie tin (aka Chaparral ring) as it will help reduce sidelobes 
--
Mike G0MJW

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