[ICOM] 718 Speech Compressor Adjustment

[John]

Way to go Sherlock.
It's guys like you who make these kinds of lists.
I don't have that rig, but have the '706 MK2G.
Thanks.
John.


----- Original Message -----
From: "Rick Robinson" <w8zt at charter.net>
To: "Icom Reflector" <icom at mailman.qth.net>
Sent: Wednesday, November 01, 2006 8:17 PM
Subject: [ICOM] 718 Speech Compressor Adjustment


> I found it. It is R2220, a 220k trimmer located to the bottom right of
> IC 2201 on the main board when looking at the top side of the board
> layout in the  service manual. How do I know for sure? I looked at the
> service manuals for the 718 and the 706MK2G and they both use a single
> IC for the mic. speech comp, and vox. The IC is the very same one
> according to the parts lists. The compressor circuit is the exact same
> except for one very small difference. The 706MK2G uses a 200K trimmer
> for the comp gain and the 718 uses a 220K trimmer.  Now you can adjust
> to your O'scopes  delight.  My Halloween treat for the group.   Now I'm
> really pumped up about putting my "twins" back together as soon as I buy
> a 718. 73, Rick.  W8ZT
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