> What's plug #52?
>
> > 73 Jason N1SU
>From the Ten-Tec archives...
To: <tentec@contesting.com>
Subject: [TenTec] Re: Omni VI+ QSK Thump and Click Mod
From: paulc@mediaone.net (Paul Christensen)
Date: Mon, 7 Sep 1998 08:28:01 -0400
There were far too many replies to answer each one individually.
The mod consists of unplugging connector 52 on the I.F./A.F. Board. =
That's it. Plug 52 should have only one wire attached to it. Those of =
you with more recent Omni Sixes should verify this as some of the =
circuit boards have been changed to SMD types. Once connector 52 is =
unplugged, use a nylon tie-wrap to keep it safely out of harm's way.
The theory behind the change: Plug 52 activates a 4066 CMOS quad =
bilateral switch which is configured as a sidetone wrap-around circuit. =
The audio click and thumps one hears is generated by the CMOS chip. =
These chips are used in the broadcast audio world and are known to cause =
the same effect when switching audio on complicated audio mixers and =
routers.
You will note after the change that you still have sidetone control and =
the ability to control its mix relative to incoming received audio =
through the front panel's "ST" button.
Use a set of headphones to listen to your QSK audio before the mod and =
make a mental note of what you're hearing. Then, using your headphones, =
critically listen to the QSK after the mod. There should be a marked =
difference.
Disclaimer:
This is not a Ten-Tec approved modification. I discovered this while =
making other modifications to my Omni Six Plus. Use care in making this =
change if you attempt to make it.
73,
-Paul, W9AC
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