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

Bill Ress bill at hsmicrowave.com
Mon Apr 13 14:07:18 PDT 2009

Hi William,

Very nice presentation. How much current does the transponder draw at 
+23 dBm Pout?

Regards...Bill - N6GHz

William Leijenaar wrote:
> Hi AMSATs,
> 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:
> http://www.youtube.com/watch?v=5j60SJroodg
> 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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