[Drake] R-7 mixer test

[Bob Camp]

Hi

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.

That's all what I remember from quite a while ago. I haven't had a R-7 
for years.

	Take Care
	
		Bob Camp
		KB8TQ


On Apr 29, 2005, at 3:50 PM, <ltaft at charter.net> wrote:

> I am working on my R-7 receiver and remember reading there is a simple 
> test for good mixer diodes by tuning the rcvr to 0 frequency where it 
> zerobeats itself.  BUT, I don't remember the details.  Help!
>
> 73, Larry  K2LT
> ltaft at charter.net
> drakerepair.com
> 800-687-9161
>
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