Date   
Re: Up onverter

Colin G4EML
 

Small add on board with PIC of my own design.  

I think there is also a design by Andy on g4jnt.com



On 11 Sep 2019, at 15:51, militaryoperator via Groups.Io <Military1944@...> wrote:

Subject: Re: [UKMicrowaves] Up onverter

Ben, 
I have seen several Chinese ADF boards where the voltage regulator oscillates and causes lots of sprogs. Try adding a large capacitor (at least 100uF) on the input and output of the regulator chip to ground. 
I get a very clean signal from mine after doing that mod. 

Colin. 

OK Colin, thanks. On the bare boards without controllers, how do you program them? 

Ben.

Re: Up onverter

militaryoperator
 

Subject: Re: [UKMicrowaves] Up onverter

Ben, 
I have seen several Chinese ADF boards where the voltage regulator oscillates and causes lots of sprogs. Try adding a large capacitor (at least 100uF) on the input and output of the regulator chip to ground. 
I get a very clean signal from mine after doing that mod. 

Colin. 

OK Colin, thanks. On the bare boards without controllers, how do you program them? 

Ben.

Re: 13cm beacons

Dave G4RGK .
 

I checked it again at 12z today, I cant hear it either.

73 Dave G4RGK


On 11/09/2019 11:47, G4LDR via Groups.Io wrote:
Hello Martyn,

Just checked the Farnham beacon, GB3FNM on 2320.920MHz and I can't hear it, normally 599+++ here. Not hearing the Leicester Beacon GB3LES on 2320.955MHz but don't monitor it very often. I'm hearing GB3SCS at 599 so 13cm RX is working here. I am hearing GB3LEX on 10368.955 at 419 at the moment.

73 Neil G4LDR

Farnham 3.4GHz Beacon Test

Dave G1EHF
 

Noel G8GTZ recently suggested 'pigging backing' a narrow band beacon on the GB3HV TV repeater at Farnham. Consequently, I have knocked together a beacon driver at the TV repeater IF. We installed the kit this morning and it is running as an experimental personal beacon under my callsign G1EHF/A. It is producing about 2W into the antenna (10dB below the TV repeater output). The driver was aimed at 3400.790MHz, however the TV repeater up-converter LO is off-frequency and drifts with temperature. The beacon was on 3400.740MHz when we left at lunchtime. We would appreciate reports but please remember this is experimental and would need improvements before being possibly licensed as a full time beacon. We have remote shut-down if any problems are reported.

Re: Up onverter

Colin G4EML
 

Ben, 
I have seen several Chinese ADF boards where the voltage regulator oscillates and causes lots of sprogs. Try adding a large capacitor (at least 100uF) on the input and output of the regulator chip to ground. 
I get a very clean signal from mine after doing that mod. 

Colin. 



On 11 Sep 2019, at 13:06, militaryoperator via Groups.Io <Military1944@...> wrote:

Having built my first SMD unit, the G4EML upconverter I was gobsmacked to find it works!!!

Feeding with 432 from the sig gen and 1968 from a ADF4353 osc board I find the ADF board o/p is very poor, lots of sprogs etc so lots of sprogs at 2.4GHz. I switched to the LeoBod osc set at 656Mhz and using the 3rd harmonic the o/p at 2.4GHz is very good. One small extra blip 400khz higher for some reason. 

But, the LeoBod is a rather expensive way of getting a lo sig so, is there a less expensive way of getting 1968MHz??


Ben.


Re: Up onverter

militaryoperator
 

Having built my first SMD unit, the G4EML upconverter I was gobsmacked to find it works!!!

Feeding with 432 from the sig gen and 1968 from a ADF4353 osc board I find the ADF board o/p is very poor, lots of sprogs etc so lots of sprogs at 2.4GHz. I switched to the LeoBod osc set at 656Mhz and using the 3rd harmonic the o/p at 2.4GHz is very good. One small extra blip 400khz higher for some reason. 

But, the LeoBod is a rather expensive way of getting a lo sig so, is there a less expensive way of getting 1968MHz??


Ben.


Re: Millimetre Contest 15th September

John Worsnop
 

I'll be available for 24GHz tests and will be looking for rainscatter or similar enhancements

G4BAO JO02cg33
24GHz 2W 60cm offset @8m agl

Skeds requests by landline (see online Phone book) KST or Zello chat

1.3 and 10GHz available for talkback

73
John



Re: 13cm beacons

G4LDR
 

Hello Martyn,

Just checked the Farnham beacon, GB3FNM on 2320.920MHz and I can't hear it, normally 599+++ here. Not hearing the Leicester Beacon GB3LES on 2320.955MHz but don't monitor it very often. I'm hearing GB3SCS at 599 so 13cm RX is working here. I am hearing GB3LEX on 10368.955 at 419 at the moment.

73 Neil G4LDR

Activation of Barr Beacon near Walsall

Iain Young
 

Hi Guys,

I (along with G0KFS and G6KOY and 2E0CVP) intend to activate
IO92bn06/IO92bn07/IO92bn08 (Barr Beacon, nr Walsall) this coming Sunday
(15th September). The activity is most likely going to be from IO92bn07.

This trip will primarily be a bit of beacon spotting with my portable
microwave SDR setup on 23cms, 13cms, and 9cms), however I will have
23cms FM capability so will put some calls out on 1297.500 MHz.

We are also hoping to be all mode on 23cms, so if so we able (it's
depending on Operator and kit availability), we'll be on/around
1296.200MHz

Timing wise, activation will probably be around 1200 UTC until around
1500 UTC, or until we get bored/cold/decide beer is more fun!

Future trips are likely to include at least a portable beacon (But
code and hardware is not quite ready for that yet). QSO capability
needs a bit more hardware integration with the Pi.


73s

Iain

Re: 13cm beacons

Martyn G3UKV
 

Thanks Denis and others for your replies. Much appreciated.
My term's report : "Must try harder..." Dish pointing slightly down. Now corrected, so we'll see.
Cheers
Martyn G3UKV

On 10/09/2019 17:35, G3UVR Denis via Groups.Io wrote:
Hi Martyn.

Just checked 13cm cant hear either of those beacons they are always just below my noise floor unless some path enhancement.

73 de Denis G3UVR

Millimetre Contest 15th September

Roger Ray
 

The third round of the 24/47/76GHz contest takes place this weekend.
Planned activity as follows:
G8CUB/P
09.00z - 12.30z Hackpen IO91CL35
13.15 - 15.30z IO91DL64 (subject to change)
24GHz 3W
47GHz 50mW
76GHz 50mW

Talkback: 144.390
KST
Mob: 07900 261121

Roger

Re: 13cm beacons

Dave G4RGK .
 

GB3FNM was 599 in the Chilterns yesterday afternoon when I checked it.

73 Dave G4RGK

On 11/09/2019 08:42, Barry Lewis via Groups.Io wrote:
Martyn,
I can't check on FNM until next Sunday although I have no reason to think it's not running.
73 Barry G4SJH

Re: 13cm beacons

Barry Lewis
 

Martyn,
I can't check on FNM until next Sunday although I have no reason to think it's not running.
73 Barry G4SJH

Re: Increasing output of pll synth

Dave G8GKQ
 

Hi Stuart

 

My eBay ADF5355 board gave me nearer +2 dBm out at 12 GHz.  I used the input stages from an old LNB to boost it to about +12 dBm.  Not sure if another stage would have added much more.

 

Dave, G8GKQ

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Stuart G1ZAR
Sent: 10 September 2019 08:27
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Increasing output of pll synth

 

I am looking at using one of the pll synth boards as the LO for a 24GHz transverter.
The ADF5355 board I am looking at gives +12dBm out at 12GHz
My transverter requires 14 - 17dBm
Are there any cheap / simple amplifier modules available to increase the output level?

thanks............Stuart

Re: 13cm beacons

G3UVR Denis
 

Hi Martyn.

Just checked 13cm cant hear either of those beacons they are always just below my noise floor unless some path enhancement.

73 de Denis G3UVR

Increasing output of pll synth

Stuart G1ZAR
 

I am looking at using one of the pll synth boards as the LO for a 24GHz transverter.
The ADF5355 board I am looking at gives +12dBm out at 12GHz
My transverter requires 14 - 17dBm
Are there any cheap / simple amplifier modules available to increase the output level?

thanks............Stuart

13cm beacons

Martyn G3UKV
 

Good morning
I have currently got my 13cm dish etc on the mast, but at various times that I have monitored the band, have been unable to hear either GB3LES (2320.955) or GB3FNM (2320.920)  for the last month or so. Beaconspot says they are both 'operational', but I notice no 'spots' for either since late June. Both are usually marginal here, but visible on an SDR from time to time.
Can anyone please confirm that they are currently QRV, or not ?
Thanks
Martyn G3UKV (IO82RR)

Crawley uWave RT 22nd Sept 2019

Alun Cross
 

The Crawley Roundtable hosted once again at the premises of the Crawley Amateur Radio Club.


Again this year following we will be holding a heat for the UK Microwave Group annual Project contest. Please do bring along your constructed equipment or project and enter. Entries do not necessarily need to have been finished during the last year. Please note that the contest will also accept software entries as well as hardware.

CARC award the G3GRO trophy to the winner of this round. The winner will also go on to be considered, together with entries from all the other round tables over a year both before and after this event for the G3VVB trophy.


Below is the provisional timetable:

10:00:    Venue opens

10:00:    ‘Bring and buy’, general socialising

12:00     UKuW Group Project contest round/G3GRO trophy judging commences

12:15     Lunch (hot dogs and burger rolls etc and tea/coffee available)

13:15     Welcome by Alun G4WGE/Denis G0OLX and results of the Project contest heat

13:30     A 24 GHz beacon source using IQ upconversion, Andy Talbot, G4JNT

                Using the LimeSDR on the Microwave Bands, Dave Crump, G8GKQ

                Break – Tea and coffee available

                RFZero Signal Source, Denis Stanton, G0OLX

16:30     End of meeting

The venue is the Crawley Amateur Radio Club’s hut and directions can be found at:

http://carc.org.uk/find-us/

See you there

73

Alun/G4WGE, Denis/G0OLX


Re: 100W 2.4 GHz PA for QO-100 available on eBay

Paul G8KFW
 

Hi its  over £300  now

 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Dave G8GKQ
Sent: 09 September 2019 11:43
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] 100W 2.4 GHz PA for QO-100 available on eBay

 

Hi All

 

There is a silent key sale of one of the Axis-NT dual 100W-capable 2.4 GHz PAs on eBay that closes today.  Ideal for TV (or SSB with a very small dish) on QO-100.

 

As I understand it, the PA is fully modified for “low power” operation (I get >60W of DATV from mine in this configuration) and just needs 0 dBm drive and 48v at about 6A. 

 

It would need the internal power supply replacing with an external 28v unit to achieve the full 100W each side.

 

https://www.ebay.co.uk/itm/Oscar100-DATV-2-4GHz-Polish-100-watt-power-amplifier-Eshail2/223648393954

 

Dave, G8GKQ

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

Chipbank at Crawley

Michael Scott
 

Hi All
 
This is just to clarify the statement in the Crawley RT programme. I plan to attend the meeting but I will not be bringing the Chipbank stock with me. There really isn’t room now that the stock has expanded somewhat, and it would be unfair on others bringing stuff to the bring and buy to take up so much room.
 
If you want anything, I can make up an order for delivery at Crawley, but please let me know in good time, preferably by the end of this week.
 
Thanks and 73,
 
Mike, G3LYP.