[Top] [All Lists]

[Yaesu] Oscillating FT

To: <yaesu@contesting.com>
Subject: [Yaesu] Oscillating FT
From: wsanders@wsanders.net (W Sanders)
Date: Thu, 14 Nov 2002 09:34:11 -0800
The oscillation might be coming from one of the transmitter stages. Make sure 
the final stage is not self-oscillating! My FT-101 self-oscillated once during 
a reneutralization attempt - it produced a loud "farting" noise when it was on 
  the 10M band, followed quickly by the smell of hot (but fortunately not 
burned-out) circuitry. Self oscillation is more likely to occur on higher 
bands and with the "twitchy" 6JS6C-based finals of the 101. I think later 
models switched to different tubes.

Also, reciever oscillations can be caused by the extra resistance and 
capacitance of cold solder connections or bad components - an old heathkit 
receiver I have oscillated like crazy until I hunted down the cold solder 
connections. Once resoldered, it worked fine.

-Wiley KF6IIU

<Prev in Thread] Current Thread [Next in Thread>
  • [Yaesu] Oscillating FT, W Sanders <=