[eagle] Re: P3E SDX Design Levels

John B. Stephensen kd6ozh at comcast.net
Wed Jul 11 12:14:16 PDT 2007

Is -15 dBm the full scale input voltage? What level are distortion products? 
The IF input levels for minimum power uplinks should be set so that ADC 
distortion products are in the noise.



----- Original Message ----- 
From: "Howard Long" <eagle at howardlong.com>
To: "'AMSAT Eagle'" <eagle at amsat.org>
Sent: Wednesday, July 11, 2007 01:58 UTC
Subject: [eagle] P3E SDX Design Levels

> Folks
> Following the Teamspeak meeting, the pertinent levels for P3E:
> V Tx Phase +10dBm @ 145.895MHz into 50 ohm
> V Tx Envelope 2Vp-p into 1kOhm baseband
> U/V AGC I/O: 2V full gain, 5V full compression (output capable of ~2.5mA
> drive)
> U band IF in -15dBm @ 10.7MHz into 50 ohm
> L band IF in -15dBm @ 10.7MHz into 50 ohm
> S band IF out -15dBm @ 10.7MHz into 50 ohm
> 73, Howard G6LVB
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