[ICOM] Icom 751

[Gary P. Fiber]

VCO trimmer caps.
Oh gosh I forget the cut off frequencies there are 4 ranges but 
everything sounds distorted. The service manual will tell you. I used to 
be able to rattle those off the top of my head :(
Even the ceramic caps can go bad. You might grab a voltmeter and poke 
into the VCO and look at the lock voltage or use a scope, it should be 
pretty steady state when locked though it does change as the dial is 
tuned so be sure to look at the specified frequency on the dial.

Gary K8IZ

On 4/8/2011 10:39 AM, Diane & Edward Swynar wrote:
> Hi Guys,
>
> Here's one that has me scratching my head some...
>
> A friend of mine loaned me his "...just plain ol' Icom 751" while he has a look at my ailing 751A. The rig works extremely well on 10-meters CW&  SSB, but when I tried it on 20-meters CW all of the signals have an "auroral" effect on them, if you know what I mean. Even the 100-KHz crystal calibtrator sounds sorta "gurgly"---but again, only on 20-meters. Ten is A-OK.
>
> Anyone have any idea what the issue might be,&  why it's so "band-specific"...?
>
> Thanks in advance&
>
> ~73~ de Eddy VE3CUI - VE3XZ
> ----
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-- 
Gary P. Fiber K8IZ

General Radio Telephone Operators License PG-19-6691,
with Shipboard Radar Endorsement.
Washington State Resident.

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