[hpsdr] Pentalop PA Consideration
a.groff
k0vm at mchsi.com
Wed Jan 14 07:55:42 PST 2009
I am in the process of patching Mercury and Pentalope into the 100 w PA
of a 1970's transceiver. In the process of setting up the driver levers
in PowerSDR>Setup>PASetting , I observed that, on the higher bands, I
started to to see the Mercury ADC OVERLOAD message...
I can measure -15dbm on 80M up to +10dbm on 10M coming from the PA
antenna change over relay back to the input of Mercury.
This may be typical (??) isolation of a antenna change over relay and it
may still be in the safe (??) range for the front end of Mercury, but PA
designers (Thor ? ) and integrators should pay at least a bit of
attention to this detail.
AL, K0VM
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