[amsat-bb] Re: P3E transponder and launch

John B. Stephensen kd6ozh at comcast.net
Fri Mar 23 14:29:47 PST 2007

Very similar SDR technology has been used in amateur HF transceivers for 
years with no complaints. SDR can be used to compensate for losses in the 
analog circuitry.



----- Original Message ----- 
From: "Patrick McGrane" <N2OEQ at aceweb.com>
To: <amsat-bb at amsat.org>
Sent: Friday, March 23, 2007 12:28 UTC
Subject: [amsat-bb] P3E transponder and launch

> Greetings from pat n2oeq
> I have been looking forward to the launch of P3E which I thought was going 
> to be this year.
> I am concerned about the germans use of the SDR technology over william 
> Liejanier's transponder design.
> I am of the belief that signal processing presents a loss in the path, 
> please correct me if I'm wrong.
> Williams Hamsat transponder is excellant and made me very interested in 
> P3E.
> Besides making the voice unnatural, are other modes allowed through the 
> SDR transponder?
> Does the Helaps system compensate for the loss?
> I'm of the Keep it simple discipline as once its up there nothing can be 
> done to fix it.
> If amsat-dl is monitoring , please update your website and provide a 
> direct Paypal donation utility.
> Thanks to amsat-na for the donation to P3E recently. 73, pat
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