Re: International Space Station-Bounce on 1296 MHz
Hi Domenico,
your plan is really interesting, but I cannot support you with exact data at present.
Maybe the wav file recorded by my SDR can give you an impression of the QSO: https://docs.google.com/file/d/0B8ak4za2va9ZVld5ZXZaREE5bXc/edit?usp=sharing
I did not receive own echoes off the ISS, just the ones of PA3FXB, who was using a 3 m dish as well and 375 W at feed. We used plain CW and I heard Jan on my speaker with 2700 Hz Bandwidth.
As it was the very first shot, just to complete a QSO, no semi scientific records were made, hi. There were too many other things to mention about.
But it is a good idea to record all data as current elevation, azimuth, slant range, relative speed and doppler to a file. Since I do the complete station control including CW transmission by a homebrew program,
it is just a small piece of work to do, to realize that. These data could easily be synchronized with a wav file, like the one linked above, by using the switching between RX and TX.
Jan and I plan further tests, when ISS will appear again at more moderate times ;-)
We are thinking about FSK441 tests too, but not at present.
vy 73,
Andreas
Andreas Imse
DJ5AR / EI8HH
Hinter der Kirche 31
55129 Mainz
Germany
+49 6136 959025
www.dj5ar.de
Von: i8cvs [mailto:[email protected]] Gesendet: Donnerstag, 30. Mai 2013 01:13 An: Andreas Imse Betreff: Re: [amsat-bb] Re: International Space Station-Bounce on 1296 MHz Wichtigkeit: Hoch
Hi Andreas, DJ5AR
Using the RADAR equation I would like to perform a link calculation of your QSO with Jan PA3FXB through the International Space Station-Bounce on 1296 MHz
I already know that the gain of your 3 meter dish is 29 dB and your power at the feed point is 200 W but I need the additional estimated following informations:
1) The range and the elevation from the ISS and your QTH as soon you started receiving your own ECHO'es
signals.
2) The maximum range and the elevation from the ISS and your QTH when your received signals were the
strongest possible.
3) Were you receiving in analogic CW using 500 Hz filter and headphone or were you using digital WSJT software
such as FSK441 or others software (commonly used for rapidly moving meteor scatter QSO's). ?
When the ISS is at the AOS with elevation of 2 degrees the range is about 2000 km and when the elevation is about 35 degrees the range is about 700 km so that I plan to calculate the budged link for both distances 2000 km and 700 km and see what the results are in Signal to Noise ratio using only a analogic CW receiver and than calculate the advantages using a digital system.
Thanks for your answere.
73" de
i8CVS Domenico
----- Original Message -----
From: Andreas Imse mailto:[email protected]
Sent: Tuesday, May 28, 2013 9:23 AM
Subject: [amsat-bb] Re: International Space Station-Bounce on 1296 MHz
Hi Domenico,
I saw your posting and will give you a short reply.
We are both using 3 m dishes, 200 W here and 375 W on Jan´s side.
That was far enough for our tests.
As our QTHs are quite close (only 367 km), it is possible that QSOs over a larger distances might be possible with less power like in aircraft scatter.
If you are equipped for 1296 MHz and able to track the ISS with your antenna, we should have a try.
Doppler compensation can be done completely on my side.
By the way: I have been visiting Naples and Stromboli 3 years ago and remember passing Torre del Greco with the Circum Vesuviana.
vy 73,
Andreas
Andreas Imse
DJ5AR / EI8HH
Hinter der Kirche 31
55129 Mainz
Germany
+49 6136 959025
www.dj5ar.de
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Andreas Imse