[amsat-bb] Re: Improved Ultra Small Linear Transponder video

w7lrd@comcast.net w7lrd at comcast.net
Mon Apr 13 19:56:23 PDT 2009

Excellent presentation William!  We should hang one of these on every final stage of every rocket (kind of kidding).  The possibilities are very thought provoking.
73 Bob W7LRD

----- Original Message -----

From: William Leijenaar 

To: amsat-bb at amsat.org

Sent: Mon, 13 Apr 2009 20:52:40 +0000 (UTC)

Subject: [amsat-bb]  Improved Ultra Small Linear Transponder video


I put some new video on youtube about my thiny linear transponder.

Its a slighty improved version, with better distortion behaviour and some extra features, like a low voltage switch off circuit.

Some general details:

Its a Mode-UV transponder with 23dBm PEP output on 2m. It runs on 3.7Vdc, power switches off when voltage drops below 3.5Vdc.

Bandwidth is 30kHz, and total weight is around 22 grams. It has an onboard beacon that is fully programmable (message, frequency and power).

The RX and TX frequencies of the transponder are user programmable, and all oscillators are locked to an onboard TCXO.

This improved version has also the option for an external reference oscillator input, and has a tap at 70cm input and a tap on its 1st IF.

The taps are very usefull to interconnect to other transponders or connection to external telemetry modems. 

The video can be found at:


I am presenter and filmer at the same time.

Please forgive me about the shivering image hihi...

More information will follow...

73 de PE1RAH

William Leijenaar



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