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Re: wanted dish feeds for the Es hail 2 satellite
David M0TGC
Hi
Isn’t there a way to tweak the resonance? AFAIK the critical
variables are the feed point position and the spacing between the plates.
Anyone??
David M0TGC
From: KENT
BRITAIN
Sent: Thursday, June 6, 2019 20:00
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] wanted dish feeds for the Es hail 2
satellite Hi Paul
I did make up a batch of 2.4 GHz CP patches and using
G4DDK's station had a QSO with PA1EW. Sam
should still have a supply of these patches.
If not, I do.
73 Kent WA5VJB/G8EMY/2E0VAA
On Thursday, June 6, 2019, 1:40:03 PM CDT, Paul Bicknell
<paul@...> wrote:
Hi all Is any one making dish feeds for the Es hail 2 satellite As we have just finished and tested 3 feeds of the circular design But unfortunately we must have made a mistake as all 3 tune up at 2.6 ghz Regards Paul -- Paul Bicknell G8KFWÂ Â South Coast UK
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Re: wanted dish feeds for the Es hail 2 satellite
KENT BRITAIN
Easily done, if you have the test equipment to measure it.
On Thursday, June 6, 2019, 4:04:06 PM CDT, David M0TGC <davidn@...> wrote:
Hi
Isn’t there a way to tweak the resonance? AFAIK the critical
variables are the feed point position and the spacing between the plates.
Anyone??
David M0TGC
From: KENT
BRITAIN
Sent: Thursday, June 6, 2019 20:00
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] wanted dish feeds for the Es hail 2
satellite Hi Paul
I did make up a batch of 2.4 GHz CP patches and using
G4DDK's station had a QSO with PA1EW. Sam
should still have a supply of these patches.
If not, I do.
73 Kent WA5VJB/G8EMY/2E0VAA
On Thursday, June 6, 2019, 1:40:03 PM CDT, Paul Bicknell
<paul@...> wrote:
Hi all Is any one making dish feeds for the Es hail 2 satellite As we have just finished and tested 3 feeds of the circular design But unfortunately we must have made a mistake as all 3 tune up at 2.6 ghz Regards Paul -- Paul Bicknell G8KFWÂ Â South Coast UK
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Re: wanted dish feeds for the Es hail 2 satellite
David M0TGC
How did you measure the resonance point(s)?
Rgds David M0TGC
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Re: Radar Interference on 23cm
Keith Le Boutillier
Hi Andy
Your information on the location and QinetiQ site makes sense if they are testing radar systems.
I mentioned Galileo as I believe that some tests are being undertaken that use a Frequency 1278.750 MHz and a Bandwidth 40.92 MHz which is also on my beam heading. Whilst no expert here whatever is causing this is starting to make 23cm unusable at times.
Thanks again for the info
73 Keith GU6EFB
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Andy G4JNT
DGPS wouldn't be using L-Band transmissions Your ref. to the Solent / Portsmouth area is pertinent. There will have been some intense EW and CEW activity recently
I live almost LOS to Portsdown Hill, overlooking Portsmouth, 18km, where QinetiQ have their land based test site, and a complete mockup of the type 45 with its Sampson radar. On normal working days, if I have a 1296 Rx running there is a huge blast of radar noise every few of seconds. This radar is now in service - is is a very powerful phased array one, scanning and able to track 1000 supersonic targetsat simultaneously (so I was told, I'm not a RADAR expert)
On Thu, 6 Jun 2019 at 20:49, Keith Le Boutillier via Groups.Io <gu6efb=cwgsy.net@groups.io> wrote:
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Re: Radar Interference on 23cm
The Galileo satellite system transmits DOWN at 1278MHz using spread spectrum, so unless you have a pointy antenna you will not hear that signal. That is the E6 signal someone referred to here earlier, and will not, itself ,have been causing QRM issues. Of course, it may be possible someone was doing testing in the presence of local interferers, jammers etc, and that was what, ISTR, the Kent station observed and blamed on E6 testing An illustration of its frequencies here: There are plenty of radar signals in the L - S band part of the spectrum, as well as cellphone signals and a few point to poin t links, so there's always the possibiity of intermod products, if you don't have good filtering-out of strong signals Andy
On Fri, 7 Jun 2019 at 09:03, Keith Le Boutillier via Groups.Io <gu6efb=cwgsy.net@groups.io> wrote:
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QO-100
David M0TGC
Hi
I am new to microwave and have just completed a set-up to work through QO-100. I have a few questions that I am sure this group can help me with. First the setup: Single 80cm dish with Patch antenna (home brew, as written up by Paul M0EYT). Octagon LNB, PLL but no external reference SDR-Play RSP1a using SDR-Console V3.09 Yaesu FT857D at 2w into SG-Labs tr2300 (430MHz to 2.4GHz). The LNB rifts quite a bit but the compensator built in to SDR-Console is coping, at least for SSB. I doubt data modes would work but have not tried so far. The QO-100 CW beacon gives s9 o s9+20 db, is that "normal" I have no idea if the Patch is resonant around 2.4GHz but my CW signal is strong and clear. How can I measure the resonance? The transverter has a forward/ref voltage output and I thought of using that with a pico pc oscilloscope but I am not sure if that would work. I have had a couple of qso's (using a 60cm dish) and reports given were 5/3 with good audio. However, when I listen to my own audio it sounds distorted, could the transmit be affecting the receive somehow? This sounds a bit rambling, apologies. Thanks David M0TGC
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Re: Laser cut QO-100 patch parts
Richard <richard@...>
David , did you get any interest shown on your previous mail ? I could be interested as I will have my new dish later next month 73 Richard
On Sat, 2019-05-25 at 06:38 -0700, Davidfpearson via Groups.Io wrote:
-- Best wishes /73 Richard Bown Email : richard@... HTTP : http://www.g8jvm.com ###################################################################### Ham Call: G8JVM . QRV: 50-432 MHz + Microwave Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W QRV 6mtrs 200W, 4mtrs 150W, 2mtrs 300W, 70cms 200W, Microwave 1296MHz 140W, 2320MHz 100W & 10368MHz 5W OS: Linux Mint 19.1 x86_64 Tessa, on a Dell Inspiron N5030 laptop ######################################################################
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Re: Laser cut QO-100 patch parts
David M0TGC
@David Pearson - Yes please.
Thanks David M0TGC
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Re: QO-100
Neil Smith G4DBN
Hi David, the patch should have a couple of dips in the return loss, but they will probably be outside of the range you can measure using the rig and transverter. I used a signal generator set to sweep mode and a directional coupler, and watched the output on my ancient spectrum analyser. A manual signal source with a reflected power indicator like in your transverter would also work, but you can get decent enough directional couplers for £20 or so The return loss of the patch I just made looked like this, the dips are about +-40MHz: If you have some sort of simple signal generator covering the 2-3GHz range, you could use a directional coupler made from a bit of PCB, with a Schottky diode detector and a meter to map out the response, but really, all that matters is that the SWR/return loss is acceptable, and that when you rotate the thing, your signal at the satellite doesn't change much. If the voltage on the reflected power detector is a lot lower than the forward power voltage, and the satellite hears you with a couple of watts, I wouldn't bother trying to optimise it any further. Neil G4DBN
On 07/06/2019 11:12, David M0TGC wrote:
Hi
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Re: Radar Interference on 23cm
Graham G3TCT
Hi all
I have also experienced severe interference on 23cm at times from here in Somerset. The interference is a crackly wide band noise which is only a little reduced by the noise blanker. It's quite different from the regular ping from a conventional ATC radar. My qrm can be regular every second or so, or it can disappear for 10s of seconds, or it can be continuous for 10 seconds or so. This made me think it was a phased array radar, but I haven't confirmed this. It peaks about 050degrees from here, but audible all the way from north through to east, the important directions!! It might be ground scatter (clutter) returns if it is a radar. One thing I tried was switching to AM and putting the audio through spectrumlab - this revealed a peak at 1kHz which was also audible. Like others, an extra filter at 1296 made no difference. 73 Graham
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Re: Laser cut QO-100 patch parts
David Pearson
Hi Richard, Only limited interest I’m afraid. There’s a price break at 10+ which brings the price down to a reasonable point but not much take up. Apologies to the three people who have written to me, work has been rather busy for me over the last few weeks Regards Dave
On 7 Jun 2019, at 11:26, Richard <richard@...> wrote:
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Re: Laser cut QO-100 patch parts
Richard <richard@...>
That's a shame Dave Those three plus another two gets half way, but that's the nature of this list unfortunately. I'm not in too much of a hurry, let me know if you get up to the 10 to get a price break. 73 Richard
On Fri, 2019-06-07 at 20:28 +0100, David Pearson via Groups.Io wrote:
-- Best wishes /73 Richard Bown Email : richard@... HTTP : http://www.g8jvm.com ###################################################################### Ham Call: G8JVM . QRV: 50-432 MHz + Microwave Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W QRV 6mtrs 200W, 4mtrs 150W, 2mtrs 300W, 70cms 200W, Microwave 1296MHz 140W, 2320MHz 100W & 10368MHz 5W OS: Linux Mint 19.1 x86_64 Tessa, on a Dell Inspiron N5030 laptop ######################################################################
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Re: Laser cut QO-100 patch parts
Conrad, PA5Y
I’ll have one if you can ship it to the Netherlands.
Conrad PA5Y
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
On Behalf Of David Pearson via Groups.Io
Sent: 07 June 2019 21:28 To: UKMicrowaves@groups.io Subject: Re: [UKMicrowaves] Laser cut QO-100 patch parts
Hi Richard,
Only limited interest I’m afraid. There’s a price break at 10+ which brings the price down to a reasonable point but not much take up.
Apologies to the three people who have written to me, work has been rather busy for me over the last few weeks
Regards Dave
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Re: Laser cut QO-100 patch parts
David M0TGC
If it helps the numbers I'll have two sets.
73's David
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Re: QO-100
David M0TGC
I have measured the forward and reflected voltages from the pins in the transverter and the swr is about 1.6 across the nb transponder so I should leave it as is. I'd like to get a bit more power but will wait and see. I have installed a 80cm dish now and get 5/6-7 reports.
I think my own signal distortion issue is nonsense, it is just that my transmissions and that of my responder are not on exactly the same frequency. I'll try a second tuner on the sdr and swap audio when I press PTT. Thanks for your help. David
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Re: Laser cut QO-100 patch parts
Chris G3WIE
I would also like two sets. Thanks for offering to do the hard work, I know what it's like...
73 Chris G3WIE
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Re: Laser cut QO-100 patch parts Oreder for 2
militaryoperator
Dave
I'll take 2 sets as well please. Sounds easier than all that messing with my Dremel again, hi.
Ben G4BXD
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Re: Laser cut QO-100 patch parts
David Pearson
Ok, it seems we have enough to do this. I’ll place order this morning. Please could I ask that you contact me directly so that we don’t clog up the form here and it also helps me collate email addresses. Just to be clear, this is for the two plates - reflector and driven element for 2.4GHz patch as described in AMSAT de article and quite a few other online blogs Material will be 0.9mm brass for both elements which I have found is structurally no problem for an N-type Best 73 Dave
On 8 Jun 2019, at 07:58, Chris G3WIE <g3wie@...> wrote:
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Re: Laser cut QO-100 patch parts
Mike Willis
I'm interested too as I need another one. Why not bring some along to the RAL RT next weekend?
-- Mike G0MJW
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Re: Laser cut QO-100 patch parts
toggle quoted messageShow quoted text
On Sat, 8 Jun 2019 at 08:43, David Pearson via Groups.Io <Davidfpearson=googlemail.com@groups.io> wrote:
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