[Amps] SB 200 problem

[Al Kozakiewicz]

No, at least not if you want any kind of accuracy.  Germanium diodes have a nominal forward biased voltage drop of about 0.3 volts - silicon is 0.7.

Al
AB2ZY

________________________________________
From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf Of RAY FRIESS [rayfrijr at msn.com]
Sent: Friday, May 04, 2012 10:57 AM
To: gzook at yahoo.com; amps at contesting.com; boatanchors
Subject: Re: [Amps] SB 200 problem

If it turns out to be a bad diode, and I cant gind a germanium, can I use a regular power supply type diode to replace it? Date: Fri, 4 May 2012 07:55:45 -0700
From: gzook at yahoo.com
Subject: Re: [Amps] SB 200 problem
To: rayfrijr at msn.com; amps at contesting.com; boatanchors at mailman.qth.net

Check the germanium diode that provides the voltage for the "forward" or, in this case, the power output, indication.  There are 2-diodes, 1 for forward and 1 for reverse (SWR position).  It sounds like the forward diode is bad.  Very common!
Also, clean the meter switch. Glen, K9STH

Website:  http://k9sth.com
        From: RAY FRIESS <rayfrijr at msn.com>
 To: amps at contesting.com; boatanchors
 <boatanchors at mailman.qth.net>; FLBOATANCHORS <flboatanchors at yahoogroups.com>
 Sent: Friday, May 4, 2012 9:30 AM
 Subject: [Amps] SB 200 problem






I have a Heath SB 200 amp that is working fine with one exception.   The meter is not functioning in the power out position.It reads fine for high voltage, grid, and SWR functions, just not for power output.   I have to use an external wattmeter to tuneupand check power output. I thought it might be just my amp until the other day when I was at a ham friends of mine, and he told me he had the same problemwith his SB 200. Anyone else had this problem and know what to do to fix it?


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