Icom R-75 question
 

Been contemplating on getting a R-75 and have done a lot of reading about
the R-75's lousy AM audio, my question is...what is it that makes it so poor
on AM....bad choice of filters by Icom or lack of something?
By contrast, I have an Icom 718 that has real nice audio on AM and SSB.

Gil
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In article .net,
"gil" wrote:

Been contemplating on getting a R-75 and have done a lot of reading about
the R-75's lousy AM audio, my question is...what is it that makes it so poor
on AM....bad choice of filters by Icom or lack of something?
By contrast, I have an Icom 718 that has real nice audio on AM and SSB.

It looks to me that that the radio was designed to be a good SSB
receiver and the AM was an after thought. It can work well for AM as
long as you don't care about audio fidelity. This is not a broadcast
listeners radio.

--
Telamon
Ventura, California

"gil" wrote in message hlink.net...
Been contemplating on getting a R-75 and have done a lot of reading about
the R-75's lousy AM audio, my question is...what is it that makes it so poor
on AM....bad choice of filters by Icom or lack of something?
By contrast, I have an Icom 718 that has real nice audio on AM and SSB.
Wrong, the audio is not poor, check passport report ""Pretty good
audio with suitable outboard speaker".The internal speaker have a
humidity and dust plastic protection cover.

hi Telamon:

It looks to me that that the radio was designed to be
a good SSB receiver and the AM was an after thought.

i agree.

It can work well for AM as long as you don't care about
audio fidelity. This is not a broadcast listeners radio.

IMO stock AM/SAM sucks; however, $80 at Kiwa will fix it.

regards,
phil :)

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