[Drake] R-7 mixer test

[Lars E. Pettersson]

On 04/29/2005 11:21 PM, Bob Camp wrote:
> When you tune the radio to zero frequency the local oscillator comes 
> right through the mixer and into the first IF. The mixer isolation is 
> roughly 30 db and the LO is around +7 dbm or so. This gives you 
> something in the -20 dbm range as a "test" signal. As I recall it 
> pretty much pegs the S meter.

The R7 S-meter goes to S9+80 dB so it will not peg it. Just tested mine,
and it came quite close to S9+50 dB, which I think is quite right (if
you do the math you get +7 -30 - -73 (S9-signal) = 50 dB over S9.)

Also tested my TR7 and with that I got S9+30 dB. Think I have to check
the S-meter...

73 de Lars, sm6rpz
-- 
Lars E. Pettersson <lars at homer.se>
http://www.sm6rpz.se/