Date   

Re: UKuG G8ACE OCXO

Gary M1EGI
 

Hi Adrian,

eBay has a listing for what I hope you are looking for...

I have no connection with the seller!

Hope this helps.


73 Gary M1EGI


Re: UKuG G8ACE OCXO

ian hope (2E0IJH)
 

I've got a Q5 Digi-LO that's coming out of my 144mhz Transverter if that's any good for this sort of thing, http://q5signal.com/index.php?route=product/product&product_id=67, currently on 116mhz but has wide range if you read manual, Phase noise was not low enough for me on 144mhz.
 
Ian
M5IJH

 
 
Sent: Thursday, November 05, 2020 at 5:05 PM
From: "geoffrey pike via groups.io" <gi0gdp@...>
To: "UKMicrowaves@groups.io" <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] UKuG G8ACE OCXO
 
Is this the 108.xxxxx MHz OCXO?
cheers
Geoff
GI0GDP
 
On Thursday, 5 November 2020, 15:22:45 GMT, Adrian G4UVZ via groups.io <adrianwhatmore248@...> wrote:
 
 
Following the generocity of friends on this forum and Brian G4NNS's PIC programming skills I now have the MK1 GB3KBQ  beacon on test using the RDDS board.

I am using the original 27 MHz crystal  which means that the keying is not very crisp and I am not sure that it would support JT4G

So the next quest is the matching UKuG G8ACE OCXO ..I have aquired the PCB layout but if there were a pre-printed board or complete OCXO out there it would make things a lot easier!

The Ever optimistic G4UVZ


Re: UKuG G8ACE OCXO

geoffrey pike
 

Is this the 108.xxxxx MHz OCXO?
cheers
Geoff
GI0GDP

On Thursday, 5 November 2020, 15:22:45 GMT, Adrian G4UVZ via groups.io <adrianwhatmore248@...> wrote:


Following the generocity of friends on this forum and Brian G4NNS's PIC programming skills I now have the MK1 GB3KBQ  beacon on test using the RDDS board.

I am using the original 27 MHz crystal  which means that the keying is not very crisp and I am not sure that it would support JT4G

So the next quest is the matching UKuG G8ACE OCXO ..I have aquired the PCB layout but if there were a pre-printed board or complete OCXO out there it would make things a lot easier!

The Ever optimistic G4UVZ


UKuG G8ACE OCXO

Adrian G4UVZ
 

Following the generocity of friends on this forum and Brian G4NNS's PIC programming skills I now have the MK1 GB3KBQ  beacon on test using the RDDS board.

I am using the original 27 MHz crystal  which means that the keying is not very crisp and I am not sure that it would support JT4G

So the next quest is the matching UKuG G8ACE OCXO ..I have aquired the PCB layout but if there were a pre-printed board or complete OCXO out there it would make things a lot easier!

The Ever optimistic G4UVZ


Re: SG-Labs,

Ian White
 

A more modern spreadsheet version of Tcalc is downloadable here:
http://www.ifwtech.co.uk/g3sek/vhfdx/dg8-design-calcs.xls

The pre-loaded example is for 2m, but the same principles apply on microwaves too.

For further details, 'The VHF/UHF DX Book' is now a free download from
http://www.trpub.net/html/dx_book.htm


73 from Ian GM3SEK


On 05/11/2020 12:11, SAM JEWELL via groups.io wrote:
I have previously recommended running either GM3SEK's Tcalc or the old but still very useful Appcad programs to analyse what your system parameters should (could?) be. One word of caution. With AppCad, anyway, cascaded stage intercept numbers do not always stack up due to some cancellations. So I always leave a few dB uncertainty in the calculated dynamic range figure. Noise figures are generally pretty close.

The VLNA preamps are high gain (on70 and 23cm) and moderate on 13 and 9cm. Their output intercept is quite reasonable and may, in many cases, exceed the input intercept of many transverters and rigs such as the IC9700.
Use masthead gain with care. In most cases you do not need to have better than about 1dB noise figure in terrestrial systems, so you may be able to trade off some low noise performance agains loss in a prefilter. Do watch that some preamps have very poor input match and will therefore not terminate filters very well. This can lead to instability in the preamp and even excess loss in the misterminated filter.

73 de Sam, G4DDK





------ Original Message ------ From: "Robin Szemeti - G1YFG" <robin@...> To: UKMicrowaves@groups.io Sent: Thursday, 5 Nov, 20 At 11:39 Subject: Re: [UKMicrowaves] SG-Labs,
I had to put attenuators between my DDK preamp and the SSB electronics transvertor, as even with the cable loss and the preselector filter, there was still far too much gain. The excess gain was OK when the band was quiet, but a real problem during a contest.
On Thu, 5 Nov 2020 at 09:34, Martin Phillips G4CIO <martin@...> wrote:
Yes and no re the preamps.
If you're using the preamp with a low NF transverter or receiver (like the SG labs tvtr) you can get away with quite a lot of cable loss after the preamp. With a mediocre nf receiver you'll still need low loss coax to avoid degrading the nf by much.
10 dB should be enough gain in the SG labs tvrt with its low quoted nf unless the following rx is very poor indeed.
Martin/
On 4/11/20 10:19 PM, militaryoperator via groups.io wrote:
The only trouble with SG Lab tranverters is the low rx gain, 10db. The Kuhne ones have 20db.
The SGL amp for 23 and 13 has an LNA but again, only 10db.
I think Mr H really needs to improve that on his next designs.
There's also a problem with timing on the rf v ptt switching, if you run the pa off the ptt there's a double kick in the pa dropping and going back to rx.
I have the 23, 13 and 9 units and they are very good save for the above caveat.
Ben G4BXD

-- Robin Szemeti - G1YFG


Re: SG-Labs,

SAM JEWELL
 

I have previously recommended running either GM3SEK's Tcalc or the old but still very useful Appcad programs to analyse what your system parameters should (could?) be. One word of caution. With AppCad, anyway, cascaded stage intercept numbers do not always stack up due to some cancellations. So I always leave a few dB uncertainty in the calculated dynamic range figure. Noise figures are generally pretty close.

The VLNA preamps are high gain (on70 and 23cm) and moderate on 13 and 9cm. Their output intercept is quite reasonable and may, in many cases, exceed the input intercept of many transverters and rigs such as the IC9700.
Use masthead gain with care. In most cases you do not need to have better than about 1dB noise figure in terrestrial systems, so you may be able to trade off some low noise performance agains loss in a prefilter. Do watch that some preamps have very poor input match and will therefore not terminate filters very well. This can lead to instability in the preamp and even excess loss in the misterminated filter.

73 de Sam, G4DDK







------ Original Message ------
From: "Robin Szemeti - G1YFG" <robin@...>
To: UKMicrowaves@groups.io
Sent: Thursday, 5 Nov, 20 At 11:39
Subject: Re: [UKMicrowaves] SG-Labs,

I had to put attenuators between my DDK preamp and the SSB electronics transvertor, as even with the cable loss and the preselector filter, there was still far too much gain. The excess gain was OK when the band was quiet, but a real problem during a contest.

On Thu, 5 Nov 2020 at 09:34, Martin Phillips G4CIO <martin@...> wrote:
Yes and no re the preamps.

If you're using the preamp with a low NF transverter or receiver (like the SG labs tvtr) you can get away with quite a lot of cable loss after the preamp. With a mediocre nf receiver you'll still need low loss coax to avoid degrading the nf by much.

10 dB should be enough gain in the SG labs tvrt with its low quoted nf unless the following rx is very poor indeed.

Martin/

On 4/11/20 10:19 PM, militaryoperator via groups.io wrote:

The only trouble with SG Lab tranverters is the low rx gain, 10db. The Kuhne ones have 20db.

The SGL amp for 23 and 13 has an LNA but again, only 10db.

I think Mr H really needs to improve that on his next designs.

There's also a problem with timing on the rf v ptt switching, if you run the pa off the ptt there's a double kick in the pa dropping and going back to rx.

I have the 23, 13 and 9 units and they are very good save for the above caveat.

Ben G4BXD



--
Robin Szemeti - G1YFG


Re: SG-Labs,

militaryoperator
 

I was of course thinking about front end gain, before the rx mixer, not in the o/p gain of the trvrt to the transceiver. 

Even my poor old FT817's have enough life in them to be usable as an IF.

On 9Cm I have a DDK preamp with 26db of gain followed by about 13db of attenuation going into the SGL trvrt with the SGL rx gain turned down as well. 

Anyway, ETTO. 

Ben 

--------------------------------------
Curator, Owner and Display coordinator
Military Wireless Museum
Kidderminster, UK.

This message was meant for the recipient
Any likeness to persons living or dead is odd
---------------------------------------


-----Original Message-----
From: Robin Szemeti - G1YFG <robin@...>
To: UKMicrowaves@groups.io
Sent: Thu, 5 Nov 2020 11:39
Subject: Re: [UKMicrowaves] SG-Labs,

I had to put attenuators between my DDK preamp and the SSB electronics transvertor, as even with the cable loss and the preselector filter, there was still far too much gain.   The excess gain was OK when the band was quiet, but a real problem during a contest.

On Thu, 5 Nov 2020 at 09:34, Martin Phillips G4CIO <martin@...> wrote:
Yes and no re the preamps.

If you're using the preamp with a low NF transverter or receiver (like the SG labs tvtr) you can get away with quite a lot of cable loss after the preamp. With a mediocre nf receiver you'll still need low loss coax to avoid degrading the nf by much.

10 dB should be enough gain in the SG labs tvrt with its low quoted nf unless the following rx is very poor indeed.

Martin/

On 4/11/20 10:19 PM, militaryoperator via groups.io wrote:

The only trouble with SG Lab tranverters is the low rx gain, 10db. The Kuhne ones have 20db.

The SGL amp for 23 and 13 has an LNA but again, only 10db.

I think Mr H really needs to improve that on his next designs.

There's also a problem with timing on the rf v ptt switching, if you run the pa off the ptt there's a double kick in the pa dropping and going back to rx. 

I have the 23, 13 and 9 units and they are very good save for the above caveat. 

Ben G4BXD 


--
Robin Szemeti - G1YFG


Re: SG-Labs,

Robin Szemeti - G1YFG
 

I had to put attenuators between my DDK preamp and the SSB electronics transvertor, as even with the cable loss and the preselector filter, there was still far too much gain.   The excess gain was OK when the band was quiet, but a real problem during a contest.


On Thu, 5 Nov 2020 at 09:34, Martin Phillips G4CIO <martin@...> wrote:
Yes and no re the preamps.

If you're using the preamp with a low NF transverter or receiver (like the SG labs tvtr) you can get away with quite a lot of cable loss after the preamp. With a mediocre nf receiver you'll still need low loss coax to avoid degrading the nf by much.

10 dB should be enough gain in the SG labs tvrt with its low quoted nf unless the following rx is very poor indeed.

Martin/

On 4/11/20 10:19 PM, militaryoperator via groups.io wrote:

The only trouble with SG Lab tranverters is the low rx gain, 10db. The Kuhne ones have 20db.

The SGL amp for 23 and 13 has an LNA but again, only 10db.

I think Mr H really needs to improve that on his next designs.

There's also a problem with timing on the rf v ptt switching, if you run the pa off the ptt there's a double kick in the pa dropping and going back to rx. 

I have the 23, 13 and 9 units and they are very good save for the above caveat. 

Ben G4BXD 



--
Robin Szemeti - G1YFG


Re: Coax for dish feed (suggestions please).

Mark GM4ISM
 

Hi Mike, I'll be looking  for it, I would expect to hear it on RS at the 2W level, possibly not at 20mW.  Path looks excellent, only 236dB troposcatter loss.  You may be able to hear me on troposcatter on the beacon antenna if there are no local obstructions  Alan GM0USI/P copied me (no rain)  at 190km on the Isle of Skye a couple of weeks ago on a bare LNB,  troposcatter PL was 246dB to him!

Please confirm frequency. If you want to set up to listen, I can pop a carrier to you at 50W almost any time. If you run a 35cm+ dish in my direction, I think it will go every day.

On 05/11/2020 09:12, Mike Webb wrote:
Im in the same situation as Andy for 10ghz need a feeder with sma's about a metre long so I can get a beacon on the air and keep all tx indoors. Otherwise hope the waterproof boxes I have remain that way. Its feeding a 20 slot waveguidein a radome which I believe should give 160 deg horizontal coverage. Hope to get a carrier only one going this weekend about 20mW and then within the month one using FT290 and Demi Transverter at about 2W and see how long that lasts. Any special frequency preferred to GM/GI coverage - If it gets to any G's Id be amazed but reports would be appreciated replies to 10Ghz@...

--
Mike GD6ICR IO74PF73TW

Virus-free. www.avg.com


Re: SG-Labs,

Martin Phillips G4CIO
 

Yes and no re the preamps.

If you're using the preamp with a low NF transverter or receiver (like the SG labs tvtr) you can get away with quite a lot of cable loss after the preamp. With a mediocre nf receiver you'll still need low loss coax to avoid degrading the nf by much.

10 dB should be enough gain in the SG labs tvrt with its low quoted nf unless the following rx is very poor indeed.

Martin/

On 4/11/20 10:19 PM, militaryoperator via groups.io wrote:

The only trouble with SG Lab tranverters is the low rx gain, 10db. The Kuhne ones have 20db.

The SGL amp for 23 and 13 has an LNA but again, only 10db.

I think Mr H really needs to improve that on his next designs.

There's also a problem with timing on the rf v ptt switching, if you run the pa off the ptt there's a double kick in the pa dropping and going back to rx. 

I have the 23, 13 and 9 units and they are very good save for the above caveat. 

Ben G4BXD 



Re: Coax for dish feed (suggestions please).

Mike GD6ICR
 

Im in the same situation as Andy for 10ghz need a feeder with sma's about a metre long so I can get a beacon on the air and keep all tx indoors. Otherwise hope the waterproof boxes I have remain that way. Its feeding a 20 slot waveguidein a radome which I believe should give 160 deg horizontal coverage. Hope to get a carrier only one going this weekend about 20mW and then within the month one using FT290 and Demi Transverter at about 2W and see how long that lasts. Any special frequency preferred to GM/GI coverage - If it gets to any G's Id be amazed but reports would be appreciated replies to 10Ghz@...

--
Mike GD6ICR IO74PF73TW


Re: Real DX !

Tim, VK2XAX
 

And if you want more info on that dish and its siblings in Canberra, go here....

https://www.cdscc.nasa.gov/

If you want to see a really big X band assembly get installed in DS43 during its latest upgrade, check out their Youtube channel and the video here...

https://www.youtube.com/channel/UCRIAdUKk4Xb-IuebzkG8XXQ

cheers

Tim


--
VK2XAX : QF56if : ITU59 : CQ30 : BMARC : WIA


Re: SG-Labs,

ian hope (2E0IJH)
 

20db gain on 1296mhz is far too much, I concure with Coiin I have the transverter and matching Amp,so that has the built in preamp,using a Ft726 as IF my Rx gain is backed right down.
 
Ian
M5IJH

 
 
Sent: Thursday, November 05, 2020 at 12:26 AM
From: "Colin Ranson" <g8lbs@...>
To: "UKMicrowaves@groups.io" <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] SG-Labs,

Ben,  

 

I have the 23cm and 13cm transverters, I use an ICOM IC-706MK2g as the IF.     I would not want anymore than 10db gain and any more is not nesseccary, (unless you have a very deaf IF RX ?) in fact I have the ‘RX GAIN’ pot in the transverter backed off.  I have mast head pre-amps (in the loft under the mast) the 23cm one has 9db gain and the 13cm one 13db gain.   Absolutely more than enough.

 

Best regards

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: militaryoperator via groups.io
Sent: 04 November 2020 22:19
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] SG-Labs,

 

 

The only trouble with SG Lab tranverters is the low rx gain, 10db. The Kuhne ones have 20db.

 

The SGL amp for 23 and 13 has an LNA but again, only 10db.

 

I think Mr H really needs to improve that on his next designs.

 

There's also a problem with timing on the rf v ptt switching, if you run the pa off the ptt there's a double kick in the pa dropping and going back to rx. 

 

I have the 23, 13 and 9 units and they are very good save for the above caveat. 

 

Ben G4BXD 

 

 


Re: SG-Labs,

Colin Ranson
 

Ben,  

 

I have the 23cm and 13cm transverters, I use an ICOM IC-706MK2g as the IF.     I would not want anymore than 10db gain and any more is not nesseccary, (unless you have a very deaf IF RX ?) in fact I have the ‘RX GAIN’ pot in the transverter backed off.  I have mast head pre-amps (in the loft under the mast) the 23cm one has 9db gain and the 13cm one 13db gain.   Absolutely more than enough.

 

Best regards

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: militaryoperator via groups.io
Sent: 04 November 2020 22:19
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] SG-Labs,

 

 

The only trouble with SG Lab tranverters is the low rx gain, 10db. The Kuhne ones have 20db.

 

The SGL amp for 23 and 13 has an LNA but again, only 10db.

 

I think Mr H really needs to improve that on his next designs.

 

There's also a problem with timing on the rf v ptt switching, if you run the pa off the ptt there's a double kick in the pa dropping and going back to rx. 

 

I have the 23, 13 and 9 units and they are very good save for the above caveat. 

 

Ben G4BXD 

 


Re: Real DX !

Lou Blasco
 

Hi All,

There was a question on the UK microwavers FB page regarding this dish. I can't contribute there because I don't live in the UK but I think the operational details about the deep space network are very interesting. The page is interactive and you can find info about what the dishes are doing in real time as well as technical details about the communication link. Perhaps one of you here might like to share the link on the FB page?


Regards

Lou
VK3ALB


On Thu, Nov 5, 2020 at 12:07 AM Andy GD1MIP <gd1mip@...> wrote:
And to think I celebrated GD to G0HIK in Cumbria on 2.4 GHz. 


Andy GD1MIP 


Re: SG-Labs,

Dominique Dehays
 

Hi ,


there is another problem , the phase noise is not that good ( synthesizer typical). It is enougth during normal conditions , but during ducts , transmitted phase noise can be a problem even at a 400km distance , we experienced that during a contest last year.

73

Dom


Re: SG-Labs,

militaryoperator
 


The only trouble with SG Lab tranverters is the low rx gain, 10db. The Kuhne ones have 20db.

The SGL amp for 23 and 13 has an LNA but again, only 10db.

I think Mr H really needs to improve that on his next designs.

There's also a problem with timing on the rf v ptt switching, if you run the pa off the ptt there's a double kick in the pa dropping and going back to rx. 

I have the 23, 13 and 9 units and they are very good save for the above caveat. 

Ben G4BXD 


Re: Coax for dish feed (suggestions please).

Bob_G1ZJP
 

Hi Andy

 

If you can re-engineer your project I have some lengths of RG401 semi rigid, approx. 450mm,  with a chassis mount 4.3/10 connector on one end.

 

I can photo if of interest – mail me off list

 

Thanks for QSO last night.

 

73

Bob, G1ZJP / M1MHZ

 

 

From: Andy GD1MIP
Sent: 04 November 2020 09:50
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Coax for dish feed (suggestions please).

 

I am putting together two dishes for 13 & 9cm. 

My plan is a multiband Vivaldi feed with an SMA connector to an SMA on a transverter mounted on the rear of the dish, currently 3w max power, but may go up to 10w later.

So I need two  roughly 1 to 2m lengths of the  lowest loss coax I can afford. Succoflex 100 has been suggested. 

Are there any better options and suggestions of a source?

Thanks Andy GD1MIP 

 


Re: Coax for dish feed (suggestions please).

Clint Sharp <cjaysharp@...>
 

I saw that, it's scary expensive but it is an excellent spec cable.

I'd question the need for ultra low loss, phase stable lab grade cable specced to 26.5GHz for 9 and 13cm?


On Wed, 4 Nov 2020 at 14:54, Colin Ranson <g8lbs@...> wrote:

Andy,

 

Yikes ! 1m of 104 terminated in SMA’s is £511 +vat from Farnell !

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 

From: Andy GD1MIP
Sent: 04 November 2020 09:50
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Coax for dish feed (suggestions please).

 

I am putting together two dishes for 13 & 9cm. 

My plan is a multiband Vivaldi feed with an SMA connector to an SMA on a transverter mounted on the rear of the dish, currently 3w max power, but may go up to 10w later.

So I need two  roughly 1 to 2m lengths of the  lowest loss coax I can afford. Succoflex 100 has been suggested. 

Are there any better options and suggestions of a source?

Thanks Andy GD1MIP 

 



--
Clint. M0UAW IO83

No trees were harmed in the sending of this mail. However, a large number of electrons were greatly inconvenienced.


Re: SG-Labs,

Colin Ranson
 

Sam, he must be monitoring this ! got a reply soonest !

 

Colin.

 

 

Sent from Mail for Windows 10

 

From: SAM JEWELL via groups.io
Sent: 04 November 2020 15:40
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] SG-Labs,

 

Under a week for mine. Asked Friday and reply yesterday

 

Sam

 





------ Original Message ------
From: "Eddie G0EHV via groups.io" <g0ehv@...>
To: UKMicrowaves@groups.io
Sent: Wednesday, 4 Nov, 20 At 15:14
Subject: Re: [UKMicrowaves] SG-Labs,

Yes, he’s busy 😉

Launched into the ether from my iPad


On 4 Nov 2020, at 15:08, Colin Ranson <g8lbs@...> wrote:

Anyone know if its usual for SG-Labs not to answer a potential sales enquiry within a week ?

I need to place an order.

Best regards

Colin de ‘LBS.

Sent from Mail for Windows 10

 

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