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Re: 122?
Robin Szemeti - G1YFG
The forum Andy mentioned is for a completely different project to the one I am interested in. The one I am interested in is by David Minchin, VK5KK and was featured on the front of a Dubus earlier in the year. It looks like this: I think David has boards and is ready to release, but I understand he is rather busy with work and I have pestered him a few times already, I don't want to pester him again.
On Thu, 29 Oct 2020 at 18:02, Paul G8KFW <paul@...> wrote:
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Robin Szemeti - G1YFG
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Re: 122?
Oh. I glanced at that article in Dubus, thought "it's the same as the other one" so didn't bother looking at it. Must go back and read it now. Andy
On Thu, 29 Oct 2020 at 18:02, Paul G8KFW <paul@...> wrote:
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Re: Commercially made Yagi for 2.3 & 3.4GHz
Stuart G1ZAR
The Directive Systems ones are centered on 3.456 GHz which is a way from our allocation. Would they need any tweaking for UK use?
Stuart G1ZAR
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Re: 122?
Paul G8KFW
Hi Andy
Could you explain G4JNT Yep, totally different project
Ad com back with information about the other 122 Ghz project
Best regards Paul
From:
UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Robin Szemeti - G1YFG
@G4JNT Yep, totally different project.
On Thu, 29 Oct 2020 at 15:10, Andy G4JNT <andy.g4jnt@...> wrote:
No virus found in this message. --
Paul Bicknell G8KFW South Coast UK
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Re: 10Ghz last night
John Lemay
David
Thanks for the nice report. I guess the 20dB difference in power at each end explains my failure to hear you. A couple of points come to mind:-
…… Starting the contacts with dots or a carrier works well if the signals are not expected to be strong
…… The above is even more helpful if SDR or an audio waterfall is in use because it will show signals that are not yet audible – it’s really tricky beaming up on something you cannot hear.
…… As you were receiving a strong signal from me, it may have been difficult to find the optimum dish heading – which you would need so that I might hear you. Some radios, where each bit of the S meter represent many dB are particularly unhelpful in this matter.
That’s three points – I’ll only invoice you for two !
Importantly, don’t be put off by one failure between us. Conditions will change and it’s only a matter of time.
John G4ZTR
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of david656179 via groups.io
I also extend my thanks to all who tried last night in what was my first 10 Ghz nb experience. I was QRP with just 100mW at the waveguide probe. G4ZTR was a massive signal with me but he did not hear me. I had good fortune to hook up with G4ODA before the contest and he kindly made me his first contact at the start of contest, he was also a massive signal. After may tries via KST and fails, G4CLA took time out to work me, he started with CW and then to SSB because I am yet to master it. He was loud but had heavy doppler and other distortions. Leicester, GB3LEX was a consistent signal on two clear bearings the 20 deg off one was much stronger however. Since visually this has clear take off for many miles and as others have said rain scatter disappeared before start of contest, it seemed to suggest a strong reflection more locally to the beacon site. I took the fact that since I could hear this beacon my RX was acceptable. GB3CAM as expected, was a massive signal and regardless of beam heading, could be heard all the time.
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Re: 122?
Robin Szemeti - G1YFG
@G4JNT Yep, totally different project.
On Thu, 29 Oct 2020 at 15:10, Andy G4JNT <andy.g4jnt@...> wrote:
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Robin Szemeti - G1YFG
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Re: 122?
Robin Szemeti - G1YFG
@Eric: nope I have not seen your direct mails :( I will go and check the spam.
On Thu, 29 Oct 2020 at 14:56, f1ghb <f1ghb@...> wrote:
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Robin Szemeti - G1YFG
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Re: 122?
toggle quoted messageShow quoted text
On Thu, 29 Oct 2020 at 14:53, Robin Szemeti - G1YFG <robin@...> wrote:
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Re: 122?
f1ghb
Hello Robin,
toggle quoted messageShow quoted text
Have you received my direct emails ? Best 73s Eric F1GHB
Le 29/10/2020 15:53, Robin Szemeti -
G1YFG a écrit :
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Re: 122?
Robin Szemeti - G1YFG
I had been holding out for David Minchin's 122GHz thing, but I am not sure what's become of that. It looked excellent in Dubus and I think would be my preferred solution for 122GHz, I think it is getting closer, but I think they keep tweaking it, so it's not got nearer a release yet. There is probably a group or forum for it, but I've not managed to locate it yet.
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Robin Szemeti - G1YFG
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Re: Commercially made Yagi for 2.3 & 3.4GHz
SAM JEWELL
I had a special three section boom made for my 112 element 'Blowtorch' QLP to enable shipping. I also provided my own trombone support. When I tried to bring the original back through Dallas Fort Worth airport I was told in no uncertain terms 'you're not bringing that on here' I got Kent to take the original back to DS and for DS to send me the new three piece boom, which ws then short enough to airfreight to the UK. I was able to bring the other parts of the antenna home with me! 73 de Sam
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Re: Commercially made Yagi for 2.3 & 3.4GHz
Neil Smith G4DBN
https://directivesystems.com/2304-mhz-above/9-cm-antennas-3456-mhz/
toggle quoted messageShow quoted text
They may do a decent discount on 9cm loop yagis now the US have lost the band, but heaven only knows what the shipping would be. Neil G4DBN
On 29/10/2020 14:04, Andy GD1MIP wrote:
Folks, I have now got transverters running for 13cm and 9cm. I have successfully used them with small PCB yagi's. My ultimate goal is to make a feed to a NOS 1.2m Andrew dish sitting in my shed, mount it on a trailer and go /P. A real winter project.
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Re: Commercially made Yagi for 2.3 & 3.4GHz
For 3.4GHz you may do better with a flat plate antenna. 30cm square, gain ~ 21dBi Not sure if you can get them for 2.3GHz Andy
On Thu, 29 Oct 2020 at 14:04, Andy GD1MIP <gd1mip@...> wrote: Folks, I have now got transverters running for 13cm and 9cm. I have successfully used them with small PCB yagi's. My ultimate goal is to make a feed to a NOS 1.2m Andrew dish sitting in my shed, mount it on a trailer and go /P. A real winter project.
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Re: 122?
John Quarmby
The following will appear in Scatterpoint shortly:
A UK Microwave Group Online Lecture streamed by the BATC Wednesday 11th November 2020 at 20:00 Chris Whitmarsh G0FDZ will be presenting his guide to the millimetre waves in this online talk. He will cover all aspects of the millimetre bands including users, propagation, antennas and feeders, basic equipment for each band to 241 GHz and beyond, and finish with mentioning the use of SDR for identifying weak signals. There should be something in the talk for everyone from beginner on the millimetre bands to expert. However, there is no heavy maths or theory to blow your mind! 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 9th December 2020 in your diary for the next talk in this series. 73 John G3XDY UKuG Secretary On 29/10/2020 09:58, militaryoperator via
groups.io wrote:
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Commercially made Yagi for 2.3 & 3.4GHz
Folks, I have now got transverters running for 13cm and 9cm. I have successfully used them with small PCB yagi's. My ultimate goal is to make a feed to a NOS 1.2m Andrew dish sitting in my shed, mount it on a trailer and go /P. A real winter project.
But for now a quick option would be premade yagi's centred around 2320.200MHz and 3400.100 MHz. Can anyone recommend a company producing yagi's of at least 30 elements? Thanks Andy GD1MIP
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Re: 2320 PA Modifications?
militaryoperator
I was right to think I had more power than I measured. Dumbkoff here just looked at his lead to power meter which still had attenuator attached. I thought I'd used a 20db with my good 30db one.....but........ its another 30db one.
So, seems I had 160W coming out of my amp, no wonder it was getting hot!
What do they say, measure twice, cut once?
I'll get the hang of this hobby soon.
Ben
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Re: 10Ghz last night
Keith GW3TKH
David, G4ALY from a scatterpoint around Lundy Is in the Bristol Channel....some years ago. 73 Keith GW3TKH
On Wednesday, 28 October 2020, 23:49:56 GMT, david656179 via groups.io <david.m.k@...> wrote:
I also extend my thanks to all who tried last night in what was my first 10 Ghz nb experience. I was QRP with just 100mW at the waveguide probe. G4ZTR was a massive signal with me but he did not hear me. I had good fortune to hook up with G4ODA before the contest and he kindly made me his first contact at the start of contest, he was also a massive signal. After may tries via KST and fails, G4CLA took time out to work me, he started with CW and then to SSB because I am yet to master it. He was loud but had heavy doppler and other distortions. Leicester, GB3LEX was a consistent signal on two clear bearings the 20 deg off one was much stronger however. Since visually this has clear take off for many miles and as others have said rain scatter disappeared before start of contest, it seemed to suggest a strong reflection more locally to the beacon site. I took the fact that since I could hear this beacon my RX was acceptable. GB3CAM as expected, was a massive signal and regardless of beam heading, could be heard all the time. The bulk of the stations that I should have been able to work were obstructed by a copse of evergreen trees that only five years ago would not have been a problem. I will have to find a new position on the ridge to avoid or I guess with the aid of aircraft or rain scatter could still work those directions. I am very interested to read that under some circumstances NBFM can produce better results. Meantime I am going to attempt a tune up of the PA's and more importantly improve the frequency stability, also stopping the frequency shift that was noted by G4ODA. And I think a bigger dish, however the old PW wideband penny feed dish is so easy from a mechanical point of view. So lots to do. It would be considered foolish of me to go portable alone on such a cold and windy night, I will and am suffering for it, but as somebody else commented, strangely I enjoyed the experience. Also I neither got stuck in the mud or put the car or myself into the ditch which is a bonus. 73 David G6KWA So thanks again everybody, see you again on 10 Ghz.
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Re: 10Ghz last night
militaryoperator
My 50cm dish was up at 60ft above ground,, 13cm Yagi at 75ft. QTH is 700ft asl. Clear in nearly all directions.
IC-9700, Kuhne transverter, DL2AM PA, 5w, Procomm dish/feed, GPS locked, Positional accuracy around 2 degrees. 73 David G4ASR --------------------------------
Sounds good David. I was hoping to have 4W on 3Cm as there were some pa's being offered, unfortunately, seller must be, how can I phrase it in PC terms?, "having problems".
Supposedly ex big wig in now-defunct ham radio company but did not even know his own PayPal account details. Come to think on it, might well have been a scam.
So the search goes on for a bit more power for 3.
Ben G4BXD
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122?
militaryoperator
There was mention of some zoom or such on using 122Ghz soon.
Where and when?
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
---------------------------------------
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Re: 10Ghz last night
Neil Smith G4DBN
Hi David, NBFM works well when there is a very high level of doppler spreading from rainscatter, which can make SSB almost incomprehensible. Obviously you need a fair bit of signal to get it to work and be close to fully quieting. Even if there is 800 Hz of rain doppler, which makes CW sound like VHF auroral signals, almost a growl or hiss instead of a tone, the FM demodulator can work very well despite all of the spreading.
toggle quoted messageShow quoted text
I have some trees (well, 120 trees) between me and most of IO90/91/92, so the only way I can work stations in those squares via rainscatter, or if there is excellent tropospheric ducting, via reflections off Drax power station chimney or the local windfarms. Hope to catch you in a future session. Neil G4DBN
On 28/10/2020 23:49, david656179 via groups.io wrote:
I also extend my thanks to all who tried last night in what was my first 10 Ghz nb experience. I was QRP with just 100mW at the waveguide probe. G4ZTR was a massive signal with me but he did not hear me. I had good fortune to hook up with G4ODA before the contest and he kindly made me his first contact at the start of contest, he was also a massive signal. After may tries via KST and fails, G4CLA took time out to work me, he started with CW and then to SSB because I am yet to master it. He was loud but had heavy doppler and other distortions. Leicester, GB3LEX was a consistent signal on two clear bearings the 20 deg off one was much stronger however. Since visually this has clear take off for many miles and as others have said rain scatter disappeared before start of contest, it seemed to suggest a strong reflection more locally to the beacon site. I took the fact that since I could hear this beacon my RX was acceptable. GB3CAM as expected, was a massive signal and regardless of beam heading, could be heard all the time.
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