|[AMRadio] watt meter|
Rev. Don Sanders
innatehealing at bigplanet.com
Thu Mar 2 11:15:23 EST 2006
My watt meters use 1N82 and 1N60's for diodes so a good germanium diode
should work. I just replaced the 1N82 in my Collins 302C after powering up
with antenna disconnected- won't do that again.
----- Original Message -----
From: "Brett gazdzinski" <brett.gazdzinski at verizonbusiness.com>
To: "'Discussion of AM Radio'" <amradio at mailman.qth.net>
Sent: Wednesday, March 01, 2006 6:36 PM
Subject: RE: [AMRadio] watt meter
> If I could find out the diode type, I could replace them,
> the inductor looks to be a match with another one
> It's a small potted thing, almost looks like a cross
> between a resistor and a small electrolytic cap.
> I don't know how you would calibrate it for average and pep,
> the average I could do off another working meter.
> I use the watt meter partly as a performance monitor, its right
> in front of the operating position, so if the swr goes wacko,
> or the audio screws up, the meter will show it.
> I have a regular scan of the plate current, grid current,
> watt meter, mod monitor when I first get on, then every once
> and a while do a re-scan.
> There is a hole in my scan now!
> > I have a Bird 4411 which uses one slug for 2-30 Mcy. The
> > meter has a switch
> > that will change the power scale from 10 watts to 10K watts.
> > It is not a true peak meter but there is a formula that
> > derives it in the
> > book. The 4411 is a 4410 with provisions for AC input, the
> > 4410 is 9V
> > battery powered only, I think. The drawback to these meters
> > is you usually
> > find the meter without the slug, and the meter is expensive.
> > I have seen
> > them at hamfests, but the slug is hard to find and very
> > expensive. It is
> > accurate to 5% of full scale.
> > As for the diodes most any matched diodes would probably
> > work. Seems as if
> > the Drake MN 2000 had 1N295 or some such. Someone with a
> > manual could
> > check. Get a handful of the NTE replacements and match them,
> > they are
> > inexpensive.
> > 73 Jim
> > W5JO
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