Date   

Re: QRO capable LNA for 1296 ?

Conrad, PA5Y
 

The Dow Key 402A definitely  does have sufficient isolation. They are excellent.

Regards

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of KENT BRITAIN via groups.io <WA5VJB@...>
Sent: 03 May 2021 11:14
To: ukmicrowaves@groups.io <ukmicrowaves@groups.io>; UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] QRO capable LNA for 1296 ?
 
I use two coax runs.    After the gain in the LNA, or the LNA and a buffer amp,
the loss in even RG58 on the rec side does not really add to the system Noise Figure.

Few relays have enough isolation at 23 cm to protect the preamp in the system you are considering.

So just a Single Pole, Double Throw coax relay near the feed.   And of course you can use
something bigger than RG58 on the Rec side.    A second SPDT that takes the preamp input
to a 50 Ohm load during TX is good engineering.
Kent G8EMY/WA5VJB


On Monday, May 3, 2021, 12:55:48 AM CDT, Tim, VK2XAX <vk2xax@...> wrote:


Hi all,

just wondering what people use as a masthead LNA on 1296 that has
switching capable of handling 400w or more ?

I was thinking of building something using a VHF Designs LNA and then
wrapping it in a large transfer relay but the $ involved in doing that
may equal or exceed a ready made device given good relays can be north
of $400USD anyway.

So what are people using ?

thanks

Tim


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







Re: QRO capable LNA for 1296 ?

Richard GD8EXI
 


Tim
I use a HCS3000 http://www.hamtech.hu/relay.html for 400watts on 1296MHz but it only has about 50dB isolation at that frequency, so may be not be enough for many preamps.

For a while I used a Tohtsu CZX3500 for 400 watts on 1296MHz and got away with it! They are rated at 600 watts CW at 1GHz so 400 watts SSB at 1.3GHz is not completely unreasonable. Their isolation is excellent >80dB being a double switch but of course the insertion loss is much higher than the HCS3000.

Richard
GD8EXI


On 03/05/2021, 06:55, "Tim, VK2XAX" <VK2XAX@...> wrote:

> Hi all,
>
> just wondering what people use as a masthead LNA on 1296 that has
> switching capable of handling 400w or more ?
>
> I was thinking of building something using a VHF Designs LNA and then
> wrapping it in a large transfer relay but the $ involved in doing that
> may equal or exceed a ready made device given good relays can be north
> of $400USD anyway.
>
> So what are people using ?
>
> thanks
>
> Tim
>


Re: 24 GHz May 2nd ?

Dominique Dehays
 

Hi all ,


24Ghz is a tougth band , a 59+ report on 3cm can well yield to 0 qso on 24.

73

Dom

Le 03/05/2021 à 11:05, Robin Szemeti - G1YFG a écrit :
The situation should improve ... there are a number of the Polish 2 watt systems in build ... 


On Sun, 2 May 2021 at 19:32, John Quarmby via groups.io <g3xdy=btinternet.com@groups.io> wrote:

I had 24GHz on the tower but it would be a stretch from here to IO82QL. No QSOs, one try with G4ODA right at the end (thanks Keith).

73

John G3XDY

On 02/05/2021 17:42, Martyn G3UKV wrote:
Not a single QSO on 24 GHz today from excellent site. (IO82QL83).
Tks G4OGA for try - but was there anyone else available with a sporting chance of a QSO ?
Monitored 'KST and 2 metres most of day.
73 Martyn G3UKV (as G3ZME/P)

Virus-free. www.avg.com

--
Robin Szemeti - G1YFG


Re: QRO capable LNA for 1296 ?

KENT BRITAIN
 

I use two coax runs.    After the gain in the LNA, or the LNA and a buffer amp,
the loss in even RG58 on the rec side does not really add to the system Noise Figure.

Few relays have enough isolation at 23 cm to protect the preamp in the system you are considering.

So just a Single Pole, Double Throw coax relay near the feed.   And of course you can use
something bigger than RG58 on the Rec side.    A second SPDT that takes the preamp input
to a 50 Ohm load during TX is good engineering.
Kent G8EMY/WA5VJB


On Monday, May 3, 2021, 12:55:48 AM CDT, Tim, VK2XAX <vk2xax@...> wrote:


Hi all,

just wondering what people use as a masthead LNA on 1296 that has
switching capable of handling 400w or more ?

I was thinking of building something using a VHF Designs LNA and then
wrapping it in a large transfer relay but the $ involved in doing that
may equal or exceed a ready made device given good relays can be north
of $400USD anyway.

So what are people using ?

thanks

Tim


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







Re: 24 GHz May 2nd ?

Robin Szemeti - G1YFG
 

The situation should improve ... there are a number of the Polish 2 watt systems in build ... 


On Sun, 2 May 2021 at 19:32, John Quarmby via groups.io <g3xdy=btinternet.com@groups.io> wrote:

I had 24GHz on the tower but it would be a stretch from here to IO82QL. No QSOs, one try with G4ODA right at the end (thanks Keith).

73

John G3XDY

On 02/05/2021 17:42, Martyn G3UKV wrote:
Not a single QSO on 24 GHz today from excellent site. (IO82QL83).
Tks G4OGA for try - but was there anyone else available with a sporting chance of a QSO ?
Monitored 'KST and 2 metres most of day.
73 Martyn G3UKV (as G3ZME/P)

Virus-free. www.avg.com


--
Robin Szemeti - G1YFG


Re: QRO capable LNA for 1296 ?

ian hope (2E0IJH)
 

Always hardwired our LNA with seperate power feeds, never felt happy with bias T's, We use a VHF design LNA on 23, 70cm and 2m, all same setup, mast Cx600N, with sepearte TX and RX lines to transverters, only difference with the 23cm one is the PA, LNA and transverter are mast mounted.
 
Ian
M5IJH

 
 
Sent: Monday, May 03, 2021 at 9:58 AM
From: "Conrad, PA5Y" <g0ruz@...>
To: "UKMicrowaves@groups.io" <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] QRO capable LNA for 1296 ?
I am using exactly what you describe Tim VHF-Design LNA and a Dow Key 402A relay. I had 4 years of sterling service until Saturday morning! Now it draws no current whatsoever. It is fed via a bias T (which checks ok) up some Ultraflex 7mm coax. Of course the RX return coax could be open circuit but I doubt it very much. More likely is that DC inductor has gone open circuit, the question is why? It could range from minor to catastrophic. I will lower the mast after Tuesday's UKAC
 
Hardly a glowing recommendation but 4 years for an LNA isn't so bad. Just really bad timing!
 
73
 
Conrad PA5Y
 
 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Tim, VK2XAX via groups.io <VK2XAX@...>
Sent: 03 May 2021 07:55
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: [UKMicrowaves] QRO capable LNA for 1296 ?
 
Hi all,

just wondering what people use as a masthead LNA on 1296 that has
switching capable of handling 400w or more ?

I was thinking of building something using a VHF Designs LNA and then
wrapping it in a large transfer relay but the $ involved in doing that
may equal or exceed a ready made device given good relays can be north
of $400USD anyway.

So what are people using ?

thanks

Tim


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






 


Re: QRO capable LNA for 1296 ?

Conrad, PA5Y
 

I am using exactly what you describe Tim VHF-Design LNA and a Dow Key 402A relay. I had 4 years of sterling service until Saturday morning! Now it draws no current whatsoever. It is fed via a bias T (which checks ok) up some Ultraflex 7mm coax. Of course the RX return coax could be open circuit but I doubt it very much. More likely is that DC inductor has gone open circuit, the question is why? It could range from minor to catastrophic. I will lower the mast after Tuesday's UKAC
 
Hardly a glowing recommendation but 4 years for an LNA isn't so bad. Just really bad timing!

73

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Tim, VK2XAX via groups.io <VK2XAX@...>
Sent: 03 May 2021 07:55
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: [UKMicrowaves] QRO capable LNA for 1296 ?
 
Hi all,

just wondering what people use as a masthead LNA on 1296 that has
switching capable of handling 400w or more ?

I was thinking of building something using a VHF Designs LNA and then
wrapping it in a large transfer relay but the $ involved in doing that
may equal or exceed a ready made device given good relays can be north
of $400USD anyway.

So what are people using ?

thanks

Tim


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







QRO capable LNA for 1296 ?

Tim, VK2XAX
 

Hi all,

just wondering what people use as a masthead LNA on 1296 that has switching capable of handling 400w or more ?

I was thinking of building something using a VHF Designs LNA and then wrapping it in a large transfer relay but the $ involved in doing that may equal or exceed a ready made device given good relays can be north of $400USD anyway.

So what are people using ?

thanks

Tim


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


Re: 24 GHz May 2nd ?

militaryoperator
 

Ooops - that's Keith G4ODA

On 02/05/2021 18:42, Martyn Vincent wrote:
Not a single QSO on 24 GHz today from excellent site. (IO82QL83).
Tks G4OGA for try - but was there anyone else available with a sporting chance of a QSO ?
Monitored 'KST and 2 metres most of day.
73 Martyn G3UKV (as G3ZME/P)



I couldn't even get a decent qso rate on 23 or 9 Martyn despite calling and calling. 

Should have stayed in bed, much warmer and interesting. 

Hey ho. 

Ben G4BXD 


Re: 24 GHz May 2nd ?

John Quarmby
 

I had 24GHz on the tower but it would be a stretch from here to IO82QL. No QSOs, one try with G4ODA right at the end (thanks Keith).

73

John G3XDY

On 02/05/2021 17:42, Martyn G3UKV wrote:
Not a single QSO on 24 GHz today from excellent site. (IO82QL83).
Tks G4OGA for try - but was there anyone else available with a sporting chance of a QSO ?
Monitored 'KST and 2 metres most of day.
73 Martyn G3UKV (as G3ZME/P)

Virus-free. www.avg.com


Re: 24 GHz May 2nd ?

Martyn G3UKV
 

Ooops - that's Keith G4ODA

On 02/05/2021 18:42, Martyn Vincent wrote:
Not a single QSO on 24 GHz today from excellent site. (IO82QL83).
Tks G4OGA for try - but was there anyone else available with a sporting chance of a QSO ?
Monitored 'KST and 2 metres most of day.
73 Martyn G3UKV (as G3ZME/P)


Virus-free. www.avg.com


24 GHz May 2nd ?

Martyn G3UKV
 

Not a single QSO on 24 GHz today from excellent site. (IO82QL83).
Tks G4OGA for try - but was there anyone else available with a sporting chance of a QSO ?
Monitored 'KST and 2 metres most of day.
73 Martyn G3UKV (as G3ZME/P)

Virus-free. www.avg.com


Re: Wavelab 23 GHz connector and PSU PCBs avaialble

Tom SP5XMU
 

Hi

Gently off-topic some more units available on Ebay:

23X1008XP https://www.ebay.pl/itm/154435741835

23X1008XN https://www.ebay.pl/itm/154435746146

as well more elements identified on 18GHz module 18X1008XN https://www.ebay.pl/itm/144026986427
--


vy73 de Tom SP5XMU / SN5R
https://twitter.com/sp5xmu


Re: Anyone else on 10GHz tomorrow?Activity List for - Sunday 2nd May

Paul G8AQA
 

Hi Mark,

Pity we couldn't make it today. Nothing heard at all.

Paul
G3Z/G8AQA

On 02/05/2021 08:44, Mark GM4ISM via groups.io wrote:

I hope to be QRV  at times on 3cm, possibly limited 13cm (small low antenna) from home

Should be on KST when QRV

50W to 35cm dish  on 3cm

5W to small panel antenna on 13cm.

Mark GM4ISM IO85AR56



On 01/05/2021 21:29, Gordon GI6ATZ via groups.io wrote:

I plan to be portable with 3cm tomorrow from IO74AI from about 10:00 til 12:00

2W to a 60cm dish

Gordon
GI6ATZ


Virus-free. www.avg.com


Re: Astra Satellite

Michael Scott
 

Thanks Colin, quite a bit of information there for me to digest!

73, Mike.

On 02/05/2021 12:53, Colin G4EML wrote:

Colin G4EML. 


On 2 May 2021, at 11:13, Michael Scott via groups.io <g3lyp@...> wrote:

Hi All

Sorry this is a bit off topic, but not entirely.

I am trying to refurbish an old 60 cm dish which I modified years ago for OSCAR 40 and want to restore it to original  for some QO-100 experiments. I want to use Astra as a signal source to reposition the LNB in the optimum position. I have an SDRPlay RX which works well for QO-100 and have set the frequency to various IF frequencies for Astra 2E from the Freesat listing from Google, but can't see anything on the SDRPlay waterfall or other display.

Does Astra have a beacon or other signal which I should be able to see and use to optimise the dish?

Thanks,

Mike, G3LYP.







Re: GB3CAM

Chris G0WUS
 

Rgr john I heard it there last night to nice and audible from Leicester city at the dizzy height of 85m asl HI

Chris G0WUS




Sent from my Galaxy


-------- Original message --------
From: John Lemay <john@...>
Date: 02/05/2021 8:02 am (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] GB3CAM

Nice to hear GB3CAM back on 10GHz !

Looks like 10368.757


John G4ZTR







Re: Astra Satellite

Colin G4EML
 


Colin G4EML. 


On 2 May 2021, at 11:13, Michael Scott via groups.io <g3lyp@...> wrote:

Hi All

Sorry this is a bit off topic, but not entirely.

I am trying to refurbish an old 60 cm dish which I modified years ago for OSCAR 40 and want to restore it to original  for some QO-100 experiments. I want to use Astra as a signal source to reposition the LNB in the optimum position. I have an SDRPlay RX which works well for QO-100 and have set the frequency to various IF frequencies for Astra 2E from the Freesat listing from Google, but can't see anything on the SDRPlay waterfall or other display.

Does Astra have a beacon or other signal which I should be able to see and use to optimise the dish?

Thanks,

Mike, G3LYP.







Astra Satellite

Michael Scott
 

Hi All

Sorry this is a bit off topic, but not entirely.

I am trying to refurbish an old 60 cm dish which I modified years ago for OSCAR 40 and want to restore it to original  for some QO-100 experiments. I want to use Astra as a signal source to reposition the LNB in the optimum position. I have an SDRPlay RX which works well for QO-100 and have set the frequency to various IF frequencies for Astra 2E from the Freesat listing from Google, but can't see anything on the SDRPlay waterfall or other display.

Does Astra have a beacon or other signal which I should be able to see and use to optimise the dish?

Thanks,

Mike, G3LYP.


Re: Anyone else on 10GHz tomorrow?Activity List for - Sunday 2nd May

Mark GM4ISM
 

I hope to be QRV  at times on 3cm, possibly limited 13cm (small low antenna) from home

Should be on KST when QRV

50W to 35cm dish  on 3cm

5W to small panel antenna on 13cm.

Mark GM4ISM IO85AR56



On 01/05/2021 21:29, Gordon GI6ATZ via groups.io wrote:

I plan to be portable with 3cm tomorrow from IO74AI from about 10:00 til 12:00

2W to a 60cm dish

Gordon
GI6ATZ


Virus-free. www.avg.com


GB3CAM

John Lemay
 

Nice to hear GB3CAM back on 10GHz !

Looks like 10368.757


John G4ZTR

1941 - 1960 of 64044