[AMRadio] The Solution


Bill Ramsey ka8wtk at raex.com
Sun Jan 2 12:58:33 EST 2005


----- Original Message ----- 
From: "David Knepper" <cra at floodcity.net>
To: "Collins Mail List" <collins at mailman.qth.net>; "Discussion of AM Radio"
<amradio at mailman.qth.net>
Sent: Sunday, January 02, 2005 11:42 AM
Subject: [AMRadio] The Solution


> Today I found an open 20K/150 watt resistor (one of two screen dropping
> resistors) that was open.
>
> Since the 4-400A's did not have screen voltage the high voltage soared
which
> may have caused the plate current meter to show negative current - too
much
> voltage floating around inside the meter.
>
> I did install the same meter in the 30K-1 and it reads perfectly, which
> proves this theory that the excess voltage is causing some kind of corona
> charge inside the meter or something to that effect.
>
> The P.A. amplifier (4-400A's) had no screeen voltage, thus, no R.F.
output.
> No wonder the R.F. current meter was not showing any R.F. current!
>
> I will install a new 20K screen dropping resistor and see what happens.  I
> just bet that this will solve my problem.
>
> Anyone with a dunce cap, please send it to me.
>
> Thanks for all the suggestions that I received.  You guys are super-smart
> and were on the right track.
>
> More later  on this matter once I install the new resistor.  Let's hope
that
> this solves this vexing problem.
>
> Dave, W3ST
> Publisher of the Collins Journal
> Secretary to the Collins Radio Association
> www.collinsra.com
> Nets:  3805 Khz, Monday/Wednesdays 8 PM EDST
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>
>
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