With cap mods to stabalize both a.g.c and sync performance, ICOM's R-75 is a
competent-n-competitive communications receiver! Stock audio has a resonant
midrange peak, but acceptable bass-n-treble accentuations can be cap modded as
well through outboard amplification and/or speakers. Last night, whilst
listening to West Coast A.M.I. Net, on 3.870 mhz, reception in a.m. wide mode
was being obliterated by some Texas sidebanders(as determined by
A.M.I.-n-Collins Net operators). However, by switching to standard(non wide or
narrow) a.m. mode(set to 15 khz width for 90 mhz i.f. filter, and 6 khz width
for 455 khz i.f. filter), and de-tuning to 3.869.75 mhz via sync am., was able
to eliminate that s.s.b. chatter splatter ! Seems these same characters were
lousing up reception on the Collins A.M.I. Net(on-the-air the first Wednesday
of the month, usually on 3.880 mhz)earlier in the evening as well. Proper i.f.
filter widths, combined with cap mods, will provide admirable operation of that
much maligned R-75 sync! WA6020SWL