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From: leadfoot%leftlane@Sun.COM (Mark Curtis)
Newsgroups: sci.electronics,rec.ham-radio
Subject: Re: Optimod: how does it work ?
Keywords: radio modulation
Message-ID: <84132@sun.uucp>
Date: 6 Jan 89 02:17:40 GMT
References: <1561@kulcs.kulcs.uucp> <1310@unccvax.UUCP>
Sender: news@sun.uucp
Reply-To: leadfoot@sun.UUCP (Mark Curtis)
Organization: Sun Microsystems, Mountain View
Lines: 15

WABX in Detroit, which is no longer on the air, used an Optimod unit
around '79 or so, I found out in a strange way.  My cousin (WD8CBO) worked
at a FM station in Flint Michigan and gave me a tour which included their
new toy, the Optimod.  Several weeks later I noticed that my woofers were
dancing around while listening to WABX.  They normally did that while
using a turntable, but not the tuner.  I called the station and asked the
chief engineer about it.  When I asked if they had "adjusted" their
optimod he was shocked I even knew what an optimod was and wanted to know
where I got my info from.  He had taken a sub-sonic filter out of their
optimod because he felt it "muddied up" the bass.  Both of us were
surprised that this low freq stuff was being received so well.  My
speakers don't have covers so it was very noticable.  About a week later
the problem was gone.  I don't know what he did, but it worked.

Mark