Tom -
Invalid test..... There is NO crystal on 80 or 20M, therefore no
voltage at the TP. You must compare with the 15 and 10M positions.
There may be an alignment or other problem, but first we have to know if
the oscillator is working on 40M the same way it does on 15 and 10M.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Tom McDaris wrote:
Garey:
I tried the volt meter at TP to crystal socket and got nothing on
the 40 crystal socket. I then tried it on 80 and got the same. 80
works fine so no cigar here. I cleaned the 40 mtr crystal pins and
socket. On 40, when you put it on CAL and turn the RF tune the tone
gets louder as you go clockwise and is loudest at the stop. It is as
if it could go higher if the stop wasn't there. Could this just be an
alignment issue? Thanks for your comments. Tom AB8BW
----- Original Message ----- From: "Garey Barrell" <[email protected]>
To: <[email protected]>
Sent: Sunday, March 21, 2010 11:17 PM
Subject: Re: [Drakelist] No output on 40 meters of TR4-C
Tom -
Sounds like you may have a bad crystal. They DO go bad.
Easiest is to connect a DMM or VTVM to the test point on top of the
chassis just behind the S-Meter. You should measure a volt or so of
negative voltage, and it should be about the same on the 40, 15 and
10M BAND switch positions.
You could try listening on a separate receiver that covers 21.5 MHZ
if available. You might need to run a wire from the receiver antenna
lead near the tube V1, right behind the S-Meter.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Tom McDaris wrote:
I have a TR4-C with good output everywhere but 40 meters. On 40 I
get nothing. ZIP! I get idle current but when you try the tune-up,
nothing happens. I have cleaned the band switch with alcohol &
Q-tip. I cleaned the crystal pins with alcohol. I tried the
alignment procedure in the TR-4 manual. Nothing. Any suggestions
would be appreciated. 73 AB8BW
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