[amsat-bb] Re: RS-38 or RS-28?

[Mike Rupprecht]

Andy,

CW telemetry is similar, but not identical

rs30 us160 ibs12 usun0 isun0 itxa8 itxb1 ttxa65 ttxb66 tnap80 tab66 msep0
mcon53 sma83 smb63 mrxa2 mrxb2
rs30 us159 isb12 usun1 isun0 itxa8 itxb0 ttxa65 ttxb66 tnap80 tab66 msep0
mcon53 sma86 smb71 mrxa2 mrxb2

rs28 ubs164 uaba166 uabb166 ibs3 iaba126 iabb126 ispa0 ispb126 taba133
tabb131 tsep136 mcon69 sma138 smb100 mra6 mrb30
rs28 ubs164 uaba172 uabb177 ibs2 iaba134 iabb134 ispa5 ispb133 taba132
tabb131 tsep136 mcon69 sma93  smb82  mra6 mrb30

73, Mike


-----Ursprüngliche Nachricht-----
Von: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] Im
Auftrag von andy thomas
Gesendet: Sonntag, 27. September 2009 12:50
An: amsat
Betreff: [amsat-bb] Re: RS-38 or RS-28?

All I can do is reproduce the exact text I have received. I'm told
convincingly that the cw sent is RS 28 and not 38 but I haven't been
listening for it myself. DK3WN's observations are the best that I know of.

I understand that DOKA can use two frequencies multiplexed for a higher
throughput : see my page on RS-30 at:

http://sites.google.com/site/andythomasorg/amateur-satellites/rs-30-yubilein
y

so I would expect that the two frequencies I have been given are centre
frequencies for two ranges, each capable of being chosen from the ground
station, depending on local qrm. 

I imagine that the main ground station is at Moscow state university with a
back up at Plis at Kaluga, who invented Doka. 

Other participating universities within the Russian Federation will also
have a DOKA groundstation (which may or may not be compatible), but the main
telemetry of the scientific payloads will be on 1.7 GHz, so I don't expect
you will hear DOKA if you are outside the footprint of >10 degrees elevation
from Moscow (it will be interesting if you do). 

Worldwide, I expect that the 435 MHz beacon when its frequency settles down
is now just a CW beacon of housekeeping data. And it is pretty likely that
the cw decode for the beacon is the same as rs-30 on my webpage.


73 de andy g0sfj




      

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