----- Original Message -----
From: "K4GM- George" <[email protected]>
To: <[email protected]>
Sent: Monday, December 31, 2001 5:42 PM
Subject: [Drakelist] TR4CW/rit
Just got home from Dayton with a TR4CW/rit. Hooked it up
and find that the transmitter will put out 150w on cw.
All controls seem to act correctly. SO I think I am OK on
the transmitter side. The receiver needs some work. I can
hear signals but the s meter does not react. The
calibrator moves the s meter to S9. Keying my K3 kicks
the s meter to 20 over. Signals which are S9 on my K3
are just readable on the TR4CW w/o any s meter action. I
plan to DeOx first and then proceed from the antenna relay
looking for trouble. But before I go through the usual
suspects, does anyone know if there is a frequent
"violator" typically causing these symptoms? Although I
have experience troubleshooting the Drake C line, this is
the first time I have dealt with a Drake transceiver. All
help appreciated.
George K4GM
If the TR-4CW is like the TR-4 it has a fuse lamp in
series with the antenna on receive. This is a small lamp
inside the power amplifier cage at the right rear corner. If
its open the receiver will act as though no antenna is
connected, that is the calibrator will be at full strength
but other signals will be very low. You have to remove the
top cover from the PA compartment to check it. Measure it
with an ohm meter but you can double check by shorting the
terminals and seeing if the signal strength comes up to
normal. The lamp is a #12, a 6.3V, 150ma lamp, same rating
as a No.47 but with a miniature twin-post base. I was able
to get a few locally but you may have to get them from one
of the bulb sellers on the web.
I had a similar problem except that I managed to zap
the lamp myself. Garey (who else?) gave me the info on the
right lamp.
Note that while a jumper across the lamp terminals will
make the receiver work right the lamp is there for a reason
and should be replaced. It was probably there because the
TR-4 was intended for mobile use where exposure to very
strong signals is possible but should also prevent damage
from static build up or nearby lightning.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
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