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[Yaesu] FT-1000 60 Hz Audio Hum

To: yaesu@contesting.com
Subject: [Yaesu] FT-1000 60 Hz Audio Hum
From: Marty Rosenzweig <marty@cmn.net>
Date: Sat, 24 Jul 2004 12:58:18 -0600
List-post: <mailto:yaesu@contesting.com>
I have a 1992 FT-1000 which, with the RF and AF gain CCW (off) and everything disconnected from the radio except a pair of Yaesu headphones, has a very noticeable 60 Hz hum (about 5 mv on the scope, both channels (ie., main and sub in "stereo"). The hum level doesn't vary with the AF gain control, the AF output (which isn't very useful) is clean and the hum disappears into the "normal" volume level but doesn't seem "right"! I've been living with the hum for a couple of years (maybe since '92!) and my memory is hazy but I think I listened to friend's 1000 and heard the same hum. The -9V buss measures 9.3V and the +9V is 8.65V but both look pretty clean.
Has anyone fixed this in the 1000 (Yaesu tech support had never heard of the problem and wasn't successful in isolating it for me...I don't have the service manual) or, at minimum, could a few owners of the FT 1000 (and 1000D) experiment with their radios and let me know if they hear a hum under the given operating conditions?
Since this may not be of general interest to the list, e-mail me directly and I'll report the results.



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