[R-390] 60 Hz Hum Output from R-390A IF Module
David Wise
David_Wise at Phoenix.com
Fri May 8 20:06:07 EDT 2009
What percentage modulation?
(Pardon me if the URM-25 is fixed-level, I'm not
familiar with it.)
Dave
-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Flowertime01 at wmconnect.com
Sent: Friday, May 08, 2009 4:30 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] 60 Hz Hum Output from R-390A IF Module
With modulation on you should get 1/2 watt out on the local audio pins of
the rear terminal board. And 100 Mili watts on the line audio as read with
the line level meter.
Turn the modulation off and you should get a 30 dB drop in the output on
the local audio pins. Use an AC volt meter with a dB scale and a 600 ohm load
resistor to measure the half watt of power and 30 dB down from that point
with the modulation off.
More information about the R-390
mailing list