Paul -
Nope! Entirely different circuit..... The S-Meter in the T-R4C is also the ALC (transmit AVC)
indicator. It will read 'upscale' in transmit showing the ALC is operating. Adjust GAIN control
while speaking until meter kicks up slightly for maximum output.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Paul Gerhardt wrote:
S-Meter is now working better and RX sensitivity is better after poking and
tighting. I think the
relay or fuse lamp socket was not making good contact. Tightened a bunch of
screws.
S-Meter only goes to half scale in XMIT. I found this problem on and R4b and
found what I did on
it a few years ago so maybe it is a similar part on the TR-4c. S-Meter zero is
normal and it
reads about right now on signals .
Below is from the list Archives of what I did with he R4b. The archive is
really useful.
Received new Bias Filter Cap yesterday and installed it today. R4B is
now working again. Thanks to help from the list again. The
replacement used was a Sprauge Atom 10uf @500V which is a bit overkill
but was the closest I could find from either Digi Key or AES on the
day I ordered.
Bias and S-Meter alignment now work perfectly.
It was very interesting to note the difference in the 'magic eye'
readings for the leakage tests on the old vs. new cap when testing on
the old Heath C-3 meter. The eye would close down about half way on
the 150V leakage test on the old filter cap and did not move at all on
the new 500v cap. It sort of a tight fit and I had to ream out the
holes in the p/s board a bit with my knife in order to fit the larger
diameter leads on the new filter.
Muting now puts the meter up to 60 over and the 40 over at 15V sets up nicely.
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