[amsat-bb] Re: S Band UP

John B. Stephensen kd6ozh at comcast.net
Fri Sep 15 02:23:20 PDT 2006

It depends on the dish size. If you look at the San Diego meeting notes in 
EaglePedia, you'll see that the proposal is a digital S/C trasponder to 
support 4800 bps with a 2-foot dish and 256 kbps with a 6-foot dish. This 
assumes a CP feed. Multiply by 1.4 for linear polarization. There is also a 
proposal for a low-speed mode B digital service that works with small fixed 
antennas. The 4.8 and 256 kbps services use wideband uplink and downlink 
signals so the microwave radio will likely be something that plugs into a 
USB port and does as much as possible in the PC.



----- Original Message ----- 
From: <sco at sco-inc.com>
To: <amsat-bb at amsat.org>
Sent: Friday, September 15, 2006 05:28 UTC
Subject: [amsat-bb] S Band UP

>I now have 2m, 70cm and 2.4ghz antennas for satellites. The radio is
> a Ft-847 with receive SSB preamps on V and U bands.
> I have a BBQ dish with a SSB 2.4 ghz downconverter. That will work
> fine with P3E (it did with AO-40). Could I still use the same dish
> for S Band uplink on Eagle? I would need some form of a upconverter
> (from 70cm to 2.4 ghz) plus a amp, to make that work?
> If I am using the S band for the uplink which band am I using for the
> downlink?  2m or 70cm?
> Les W4SCO
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