Hmmmmmm. Several oddities with this.
1. Usually lower transmitter output is experienced when RCVR control is
selected, bringing the PreMixer signal over from the receiver.
2. If it was a cable problem, 80M is the least likely to have increased
losses as it is the lowest frequency PreMixer signal.
3. Why would transmitter alignment "fix" it, but only for a short while.?
Most obvious is a problem with the TRANSCEIVE switch contacts. Have
they been cleaned, DeoxIT'ed?
If we were talking 10M, I'd suspect the trimmer cap adjustment changing
since typically they are very near minimum capacitance and so have very
low tension on the adjuster screws. But ... On 80M, what alignment
adjustments would be "drifting" with time?
Possibly a leaky mica cap on the PreMixer on the 80M band position.
C142, C145, C156 or C185.
Only other thought would be marginal levels from the PTO, Band Osc or
PreMixer, falling off with time. Possibly a gassy V8?
Be sure and let us know what you find....!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Chuck Pool wrote:
Hi to all:
After aligning the T4X-C the power output is equal when switching
between R4-C or T4X-C control via the transcieve switch on the
transmitter.
Now, the output is lower when the transcieve switch is in the T4X-C
position. This is for 80 meters. I aligned the transmitter again
and output is same/normal when switching between receive or
transmitter control via the transcieve swithch on the T4X-C. Again,
later, the output falls when selecting the transmitter control via the
transceive swithch on the T4X-C.
I may tune up the transmitter again. However, I am gettig tired of
doing this.
Any ideas what is going on?
73,
Chuck
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