[amsat-bb] A tip for Gqrx users and report of the copy of FIREBIRD-II FU3/4 19k2 FSK.

M.Sc. Pavel Milanes Costa co7wt at frcuba.co.cu
Tue Oct 20 00:15:19 UTC 2015

This is the bookmark file I have talked about. [attached four you use, 
feel free to use it...]

I have made a request to Alexandru Csete the author of Gqrx and it has 
modified the source code of gqrx on github, now gqrx support up to 10 
visual levels before fold and rewrite... it's only in the source yet, so 
wait for it on the official PPA soon, if you know how to compile from 
the source give it a try, it's working great here...

Thanks to Alex Csete for Gqrx...


El 19/10/15 a las 10:47, John Grant escribió:
> Hi Pavel,
> I wonder if you could send through the bookmarks file for me to have a 
> try with, I'm just about to put up a rhcp 70cm antenna and use gqrx 
> frequently so this would be a good test.
> Thanks,
> John
> On 15/10/2015 04:24, M.Sc. Pavel Milanes Costa wrote:
>> I'm playing this night with my linux box and rtl-dsr + Gqrx + 
>> Gpredict to see the 70cm satellite sub-band...
>> And found a way to identify the sat from the spectrum at a glance in 
>> 70cm using the bookmarks of gqrx... very handy feature of this 
>> software... just linux here, not know if windows sdr soft has this 
>> feature...
>> After playing with satlist.csv (from 
>> http://www.ne.jp/asahi/hamradio/je9pel/satslist.htm) and parsing it 
>> to make it work with gqrx... I fire the Gqrx software, put up the 
>> antenna and watch for any suspicious signal... and the bookmarks on 
>> top of the signals are there, nice....
>> ... (a few minutes after) ...  haja !!!!
>> A packet like signal around 437.4 Mhz, zoom it.... wow, to wide for 
>> normal packet... let's widen the filter to fit... ~25 Khz is enough, 
>> hum... it's bigger than 9600 bauds... lets see what the bookmarks on 
>> the screenm says... FIREBIRD-II FU4 19k2 FSK within the +/- 10khz of 
>> doppler... bingo !!!
>> Let's run Gpredict to check.... right on the spot... and also 
>> FIREBIRD-II FU3 incoming on range... let's check... right...
>> So if you use linux and some SDR hardware with Gqrx, you can use the 
>> bookmark function to this purpose, you can actually click & zoom and 
>> then read of the screen to approximate which is the satellite who tx 
>> that signal... all at a glance...
>> If any of you want to play with this I can send you my bookmark file 
>> of the entire 70cm satellite sub-band, updated with the last info 
>> from http://www.ne.jp/asahi/hamradio/je9pel/satslist.htm just email 
>> me a private msg.
>> I was not trying to decode, just to prove the usefulness of this 
>> feature, I use the latest gqrx & gpredict from ubuntu PPA.
>> BTW, none of the FIREBIRD satellites are in the 
>> http://www.amsat.org/status/ page, so I can't update it's state.
>> 73 from Cuba, CO7WT
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