[ICOM] IC-706MKII low FM audio adjustment

[gfiber at comcast.net]

Dana,

I ment to say 706MKII. Thinking of that the mic circuit was the same as the original 706. In the original 706 we used to do a resistor change that would get the mic audio increased. It was surface mount resistor and was on the bottom of the mail unit. Look around at places like mods.dk and you should come across that " mod ".

Gary K8IZ
 -------------- Original message ----------------------
From: "Dana Luke" <danaluke at maine.rr.com>
> 3/24/2006
> 
> QST to anyone who might know how to adjust the FM audio level on an 
> IC-706MKII,
> 
> I have an IC-706MKII (not the G model) which seems to have low audio when on 
> FM using the stock HM-103 hand mike.  I've had the rig 6 years now but never 
> used it much on FM so it wasn't a problem but now I'd like to use it on FM 
> more.
> 
> When I have the mic gain set to 10 the audio is just barely acceptable if I 
> speak loudly into the mic.  On SSB I can run the unit at a mic gain of 6 or 
> so and it's OK.  I tried a different HM-103 mic with the same results so 
> it's not the mic.
> 
> Inside the unit there are two adjustment points, labeled FM MAX DEVIATION 
> (R274) and FM 3.5 kHz DEVIATION (R260).  I have a feeling that adjusting one 
> of these will fix the problem.  I don't want the rig to deviate more than 5 
> kHz and go out of the passband of the repeater receiver, and I'm not clear 
> as to which one of these adjustments will bring up the audio gain without 
> making my signal more than 5 kHz wide.
> 
> Can somebody please advise me as to which one to turn?  Thanks!
> 
> 73 de Dana KA1PK
> 
> 
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