Nice job Wes.
"And you sir, are a steely-eyed Triton man"
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-----Original Message-----
From: wes Bolin <k5apl41@gmail.com>
To: tentec <tentec@contesting.com>
Sent: Sun, Jul 19, 2015 06:42 PM
Subject: [TenTec] Triton IV Intermittent Failure
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<pre style="font-size: 9pt;"><tt>I just put up an antenna for 20M so I can
check into the nets and also
chase
a
little DX. As Murphy is alive and well, the 20M band had all kinds
of
noise/ pulses/FMing with a S7 to S9 noise level. BTW today its normal.
And
my Triton IV that I had been only listening with decided to attenuate
the
receive signals after a
few transmissions. After sitting awhile, it was normal
again. Until
transmitting.
I have a signal generator, and a scope, but
wanted to do a quick and easy
problem isolation. The Cal was attenuated too so
I knew the problem was
following the
front end of the receiver. My technique
was to heat circuitry with a hot
air gun from
Harbor Freight and see if I
could duplicate the intermittent failure. Sure
enough the
AGC-IF board was
the problem. I could heat Q6 and the receive signal would
drop. Spraying a
little bit of Cool Spray on the transistor cooled it down
and the
radio worked
normally. I replaced the MPS6514 with a 2N2222A and all
is
well.
Alternating heat and cold is a good way to find temperature
sensitive
intermittent problems. Maybe this will help with other
troubleshooting
problems. BTW I love these discrete
components.
Wes
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</tt></pre>
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