MY QO100 SETUP

Daniel, EA4GPZ, has reported that he received the beacon on May 16, 2019.

https://destevez.net/2019/05/f…qo-100-station/#more-6594

SV1BDS

Hello George,

I had a successful reception of DL0SHF on June 2nd, 2020. The moon passed about 1.5 degrees below the beam of my 1.8m offset dish, so I adjusted the inclination of the antenna before the moon pass.

I used a GPS-controlled LNB and the RSP1A for reception. The DL0SHF signal was audible for a few minutes and I was able to decode the CW signal by ear. Due to the Doppler effect the RX-frequency was about 6 kHz above the transmitting frequency of the beacon.

All in all a very exciting and rewarding experience!. Good luck with your redeption.

Vy 73

Holger ‚Geri‘, DK8KW

Hello together,

can anybody tell the time for 16.10.2020 for my location jo31om to visit to DL0SHF beacon?

Thanks!

73 Wilhelm

Hi George,

many thanks for your answer. I will look mooncalc.org

73 Wilhelm

Hi George,
This amp seems to be quite new, so I don't have any experience. From the data sheet it seems to be quite linear up to 25dBm output in Class A. It's high gain and relatively low price is interesting of SDRs.
73 Gerhard

hello George

looking on the internet I found this nxp module could it work at 2.4ghz? I attach date shhet it seems to me twin mhl21336

73 de iw5bsf Roberto

Hallo,

which tool is useful to predict the max. elevation of the moon? As far as I know it will reach 28,6 degrees. Will it be possible to receive the DL0SHF without adjusting the dish to a lower elevation? Some former tests in my court with a prime focus dish were negativ. I am not sure to see the cold sky, it seems like much noise from different directions. Weak signal experts like to use SpectraVue for receiving such signals. The vertical resolution can be reduced and there is a signal history mode also. It must work with other systems too, the receiving result is generally defined by the LNB and dish size.
Thanks
73
Andreas

Is this linearity test on 10GHz ?

For the 2.4GHz patch on the POTY. Receiving a signal via a linear antenna, the RX signal should be constant as you rotate. To see -20dB you need to measure RX signals with first LHCP (optimum coupling to the LHC dish feed) then with a RHCP antenna at the same distance (max loss)

Thanks

David

Thanks for the detail George.

A good set of tests. - Particulary that a helix of only 3 turns can give good circularity.

I'll leave the question about plate spacing or bending for either Mike, Remco or Paul, but my feeling is the circularity is primarily determined by the location of the feed point on the patch element.

73 David

Quote from SV1BDS

The question was : when I adjust the POTY for optimum SWR moving plates does the circulation affected?

Yes. PLEASE DO NOT ADJUST LIKE THIS FOR MINIMUM VSWR. HOW MANY TIMES MUST I REPEAT THIS ? The same point comes up again and again and again. If you tune like that the chances are you will produce a linear antenna. HF DXCC types old antenna lore does not apply! POTY is a complex antenna.

Now to get those resonances right build accurately. Exactly 3.00 mm spacing. No deviations in sizes, correct connector type. To tune if required use a vector network analyser and look and what's happening on a Smith Chart. If that's too difficult, perhaps ask someone for help. Really it needs the proper tools. If you really can't find a VNWA find where it is matching. If it's high gently bend all four corners towards the reflector just a little. Do it evenly and symmetrically. See what happens. If it's really far off frequency the dimensions are not correct.

Here is mine - before and after.

Mike