Thanks to all who offerred help.
I let the transmitter sit over the weekend and on Monday it was OK again.
Back to normal. I don't understand, but since it don't seem broke I think I
won't open it up.
73, DE WA9RYF
----- Original Message -----
From: "Richard Knoppow" <[email protected]>
To: "Howard Traxler" <[email protected]>
Sent: Monday, February 22, 2010 9:55 AM
Subject: Re: [Drakelist] Possible problem with T-4XC xmtr
----- Original Message -----
From: "Howard Traxler" <[email protected]>
To: <[email protected]>
Cc: "Howard K Traxler" <[email protected]>
Sent: Sunday, February 21, 2010 3:58 PM
Subject: [Drakelist] Possible problem with T-4XC xmtr
Hi all, don't know that this question went out on the list:
Friday I was tuning up my T-4XC on 80M. Heard a very loud POP came from
somewhere behind the front panel. No smell of smoke or oazone.
Never tune for more than 4 or 5 seconds at a time and never off-resonance
more than 1 or 2 seconds. Before this incident, the xmtr tuned up to 120
to
140 watts (according to my TW-1 talking watt meter); after, it now peaks
at
about 80W. I had a QSO afterwords, so I know it's working some. Antenna
match is about 1.3/1.
Do you think I did something real bad or maybe it's just a tube or a plate
choke or something? Where should I start to diagnose?
Thanks, anybody.
73, Howard, WA9RYF
This is sort of generalized trouble shooting advice. First make a
careful visual inspection. Sometimes parts fail without producing much
smoke or odor, however, there may be visible residue. Also wiggle the
resistors a bit to see if any are cracked.
The next step is to make socket resistance and voltage readings and
compare them to the values in the handbook charts. Keep in mind that in
equipment as old as this that the resistors will have drifted so the
values may not be exact without indicating a problem. However, if any are
more than perhaps 20% off its a pretty good sign of something wrong.
Of course check power supply values first and open up the power supply
and inspect it also. Even if the noise did not seem to come from the PS it
may have.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
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