Thought I would set up a thread for unusual station setups
Here is mine from today, receiving QO-100 rowboat style:
https://twitter.com/oh2aue/status/1165243013624422400
Michael, OH2AUE
Thought I would set up a thread for unusual station setups
Here is mine from today, receiving QO-100 rowboat style:
https://twitter.com/oh2aue/status/1165243013624422400
Michael, OH2AUE
OH2AUE/mm
I would say /am (aqua mobile) ; -)
Maybe this is now a kind of dish sailing boot.
I really want to correct the fake news on Doppler Correction with Geostationary Satellites.
Sometimes Doppler Correction is mandatory for pleasant copy:
https://twitter.com/oh2aue/status/1176124628043014144
(Copying the QO-100 CW beacon mobile, so far about 50km worth of experience)
In my junk box I have a Qualcom Euteltracs/Omnitracs microwave head with stepper motor driven pillbox antenna, vertical polarization and all. This might even make SSB communication possible...
Having laughed at IRC, I (re)viewed your movie twice, but I am not convinced. It's not the Bodnar (assuming you use(d) that) but I suspect the instability of the IC-402.
I think you need more samples with all LO's GPS locked and also accelerate en slow down etc ; -)
Anyway, creative and nice experiment! : -)
Not sure what you are referring to?
My frequency is is extremely stable.
What you hear in the audio pitch is Doppler due to my accelerating and decellerating?
The name of the video is "Compensating for QO-100 Doppler with Fuel Injection Rate"
Accelerating from zero to about 80 km/h will shift the received frequency up by almost 800 Hz
as I am clearly approaching the satellite. This is why copying SSB mobile is a bit touchy.
Very similar to my AO-13 mode B/L/S system. I also had a TS-670S as a 10m IF radio. See AO-13 mode L with a TS-711 and TS-811
I did my AO-40 operation from HB9 land (as HB9DRD) with various combinations of IC-910H, TS-700G and an IC-PCR1000 for beacon decoding while talking.
Happy days!
Here unusual RX setup.
RX dish 1,5m prime focus, cirkulator insert in the waveguide for circular polarisation ...
RX now H and V with ca. 3dB less at the same time on one RF line output of the LNB...
Both transponder noise level visible.
So I can watch and receive NB and WB at the same time ...
73 de Robert
Both transponder noise level visible.
But that's the WB DATV Beacon not the transponder noise
Hi Robert,
interesting setup, but why did you take the route to circular polarization ?
If you use a normal linear polarized LNB and tilt it 45 degrees then you receive also both transponders.
Of course you will also loose 3dB on each transponder going that path.
Kind regards
Matthias
Matthias, tnx for your hint ...
I have so far not found a reference from which it can be seen that at 45 degrees position of the polarization the loss is 3dB. At 90 degress it is 20 dB less, so you might think that at 45 degrees it is 10 dB less ..... so I didn´t try it ...
73s de Robert
Hi Ribert,
you are very welcome.
Actually you can simply use the cosinus function.
Theoretically the loss at 90 degree is infinite but in the real world it is somewhere around 20dB (because the TX and RX antennas are most likely not ideally linear polarized and you might have reflections etc.).
Kind regards
Matthias