Curt -
The four slugs in either the receiver or transmitter should never be
adjusted _UNLESS_ someone has already been 'fixing' them and you are
SURE they are misadjusted.
Receiver -
I don't recommend Section VIII, C, 8 & 9. Again, this does not need
adjustment _UNLESS_ (see above!). The adjustment is a 'little'
tricky, and it's easier to mess up than improve, without 'help'.
Section E, use the dimensions and frequencies in para 7. The 10M slug
adjustment of the RF TUNE can be 'fudged' a little if the caps are at
minimum capacity to get the alignment screws a little more tension.
It's a good idea to put a dab of nail polish on the adjuster when they
are this loose, otherwise your adjustment will change when you turn the
receiver back over!
Transmitter -
Section VIII, A I just use the transmitter CO as the source rather than
messing with the external generator via the INJ jack. Keep the
_dipped_ plate current at 200 mA or lower to keep the adjustment
peaking from being masked by the ALC. Use the dimensions and
frequencies as per 16, again ensuring sufficient tension on the trimmer
to hold adjustment.
If you plan on using TRANSCEIVE with RCVR or XMTR control, it's best to
peak the INJ trimmers on each band in both receiver and transmitter WITH
the two cabled together.
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>
Curt wrote:
Am considering alignment of an R-4A ( except for the preselector
procedure ) and T-4X ( except for T4, T5, T6, & T7 slug adjustment )
per the manual instructions. But, recall reading on this list that
certain of the instructions should NOT be performed.
Any other items other than the two I've mentioned that are to be avoided?
The only problems with the R4A is audio distortion with RF gain near
maximum, and the S-meter reading changing with AF gain setting. Only
issue with the T-4X is 20M output is about half that for 80, 40, & 15M
( haven't checked 10M ). I own the tools listed in the instructions
and want to avoid shipping these rigs.
73, Curt KB5JO
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