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Re: vusat

On Tue, 18 Jun 2002, Nagesh wrote:

> The problem is with the vhf downlink (145MHz) and command uplink (149
> MHz) frequencies. Once the ham transponder is commanded, the vhf
> downlink will be on and it will block the command RX and no further
> commanding would be possible. Designers are finding it hard to develop
> filters with 4MHz separation and there is a problem of overlap. 

The HAM transponder should be on a fail-safe timer.  And a low voltage
drop-out circuit.  This way, after a certain amount of time or low
battery, the Transponder will always turn off.


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