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Re: AM Audio Processors
To: CRTech <crtech@crtech.org>
Subject: Re: AM Audio Processors
From: RADIO DOCTOR <lylehenry@fastmail.fm>
Date: Sun, 22 Jul 2018 16:12:01 -0700 (Pacific Daylight Time)
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References: <CAB42DVoxm0Ti9XQfxze3Qqh3TScvtL3bMLWiJ-M9P4WBcW1UAQ@mail.gmail.com> <1408412207.3618221.1531345986177.JavaMail.zimbra@bevcomm.net> <1023527894.3006318.1531346206610@mail.yahoo.com> <alpine.WNT.2.10.1807111517450.3956@Lyle-Dell-D630> <CAOkhgWp0zAkOfhKcOfJudKwETmRVFZVPTtafE2zAS6d=kUOT2g@mail.gmail.com>
User-agent: Alpine 2.10 (WNT 1266 2009-07-14)
Thanks for your thoughts, Willie. Two nights ago my friend in New Mexico put a Compellor at the studio ahead of the Marti mono STL and moved the Orban 9200 to the transmitter site. Huge improvement. Says it sounds so much louder; the modulation is much more dense with no negative peak spatter and positive peaks tight at 125%. Wish he'd found the Compellor while I was still there so we could have made the change then. I would have heard it further as I drove west. As I expected, the STL did not like dealing with the processed audio.

On Fri, 20 Jul 2018, Willie Barnett wrote:

Just a handful of thoughts from a "former" AM guy of 20 years. :) (It's
still in my blood, tho!)

I wouldn't decrease the high end bandwidth like that. It helps with speech
clarity to keep those highs out to 9KHz or so. There really isn't much
"power" in the highs, either. Depending upon the radio, those highs will
help with intelligibility.

You COULD reduce the low end a few DB, tho. THAT is where POWER is really
wasted, considering that the VAST MAJORITY of AM listening isn't done on
hi-fi systems with big woofers. ;) Anything below ~50Hz, for example, is
really unnecessary for talk formats. A slope-off, rather than a brickwall,
is good. Too much bass makes talk sound too muddy.


On Wed, Jul 11, 2018 at 6:29 PM, RADIO DOCTOR <lylehenry@fastmail.fm> wrote:

I'm also wondering if it would make sense to cut the audio bandwidth in
half from the 9200, say 4.5kHZ instead of 9-ish to stop wasting modulation
on frequencies that almost no receivers except the modulation monitor can

FMeXtra digital SCA systems - encoders and receivers
SCA/FM/FMeXtra radios: fixed & tunable-wood cases-nice sound
Sidekick SCA generators - 67/92kHz-checked and calibrated
  Lyle Henry, CPBE  THE RADIO DOCTOR  K9DKW  Los Angeles, CA
SCA Consultant:  Brazil, China, India, Mexico, Taiwan, SE Asia
       323-660-4690 Home/Office     213-880-4690 Mobile

References: AM Audio Processors
(Tom Van Gorkom <tomvangorkom@gmail.com>, 11 Jul 2018 19:16:24 -0000)
Re: AM Audio Processors
(Mark Carol Bohnett <mbohnett43@bevcomm.net>, 11 Jul 2018 21:53:21 -0000)
Re: AM Audio Processors
(JIm Turvaville <jimturbo61@yahoo.com>, 11 Jul 2018 21:56:54 -0000)
Re: AM Audio Processors
(RADIO DOCTOR <lylehenry@fastmail.fm>, 11 Jul 2018 22:30:07 -0000)
Re: AM Audio Processors
(Willie Barnett <wbradiolists@gmail.com>, 20 Jul 2018 15:22:45 -0000)
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