[amsat-bb] Re: IARU coordinated frequencies for LitSat-1

[M5AKA]

Given there is only 200 kHz of spectrum available for satellites in the 144 MHz band it is unrealistic to think that each satellite can have their own exclusive frequency, sharing is necessary. 

If you look at the launches planned for the end of the year you will see many other satellites with downlinks on 2m, there are 3 other satellites with linear transponder downlinks in 145 MHz planned for launch this year plus a number of others with beacon downlinks. Frequency sharing is a fact of life.

BTW there was a move in IARU Region 1 to get another 30 kHz of 144 MHz spectrum assigned to the satellite service. Has anyone in Regions 2 and 3 tried to get additional spectrum ? With the increasing number of satellites we need it.


http://ukamsat.files.wordpress.com/2013/04/vie13_c5_03_increased_amateur_satellite_service_144mhz_usage.pdf


73 Trevor M5AKA



________________________________
 From: Alan <wa4sca at gmail.com>
To: nx9b at comcast.net; amsat-bb at amsat.org 
Cc: CC <APBIDDLE at UNITED.NET> 
Sent: Thursday, 12 September 2013, 14:01
Subject: [amsat-bb] Re: IARU coordinated frequencies for LitSat-1
 

Jeff,

There is actually very little problem, and even an opportunity, in the frequencies.

FO-29 has a high inclination, while anything deployed from the ISS will be approximately 51 degrees.
The overlap of the orbits will be few and short, and may give some interesting double hop
opportunities.  

SO-50 is a bit more problematic.  It has a similar inclination to the ISS, and anything deployed from
it.  I didn't have time to do a careful calculation, but most of the time their footprints/mutual
visibility will not overlap, except for an occasional period of 3-5 orbits. 

Finally, anything deployed from the ISS will have a short lifetime, depending greatly on the altitude
of the ISS when it is launched.

You can play with a good tracking program such as SatPC32 in multitrack mode to get an idea of how the
orbits fit together.

73s,

Alan
WA4SCA






-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On Behalf Of nx9b at comcast.net
Sent: Wednesday, September 11, 2013 9:14 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] Re: IARU coordinated frequencies for LitSat-1



Did anyone else notice that the transponder downlink frequency is exactly on the center frequency of
FO-29's uplink or that the Packet downlink was on the SO-50 uplink (without the 67Hz tone)?? 

Seems like this wasn't very well 'coordin ated'. I hope those freq's were misprints. 
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