Peter:
I would look in the area of the Low Pass Filter section or the Bandpass
filter section. A quick check of the low pass can be done on RX by
connecting the antenna to the rf out jack and then moving it to W1. If the
signal level increases then the problem is in the Low Pass Filter section.
A good test of the Bandpass filter is to look at the RF voltage on the base
of Q5 in the tune mode on a good band and then on a bad band and see if the
level is way down as compared to a good operating band. Check solder
connections on K5 and K6 and K11. All other sections of the radio are
functioning if it works on other bands, Also make sure that C33 is
installed in the correct holes. If I were a betting man I would bet on the
Low Pass Filter circuit that is common to those two bands.. (L23, L24,
C218-222)
Good Luck
73
Jim Younce K4ZM
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