[ICOM] Raspy CW note on IC751A

[EP Swynar]

Hey Guys,

Is this happening on INCOMING signals, or on transmitted signals...?

I have an interest in this because I, too, have a 751A...luckily I've not
had such a problem (yet!).

The closest I ever came was when receiving strong AM phone signals: the
audio was all distorted, when I realized that the REAL culprit was the fact
that my noise blanker was left on!

~73~ Eddy VE3CUI - VE3XZ

**************************
----- Original Message ----- 
From: "Don Moman VE6JY" <ve6jy at digitalweb.net>
To: "'ICOM Reflector'" <icom at mailman.qth.net>
Sent: Tuesday, June 12, 2007 12:14 PM
Subject: RE: [ICOM] Raspy CW note on IC751A


> You really need to see if it does it on all bands.... Mine does,
> therefore I'm suspecting the regulator and the filtering around it and
> not the VCO trimmers.  Of course, while you are in there, the trimmers
> should be changed out anyway.
>
> 73 Don
> VE6JY
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net]
> On Behalf Of Adam Farson
> Sent: June 11, 2007 7:23 PM
> To: 'ICOM Reflector'
> Subject: RE: [ICOM] Raspy CW note on IC751A
>
>
> Hi Gary,
>
> Yes, it sounds like the notorious VCO trimmer problem. The 4 plastic HPL
> VCO trimmers will need to be replaced with ceramic parts.
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net]
> On Behalf Of Gary Nichols
> Sent: Monday, June 11, 2007 11:27
> To: Icom at Mailman.Qth.Net
> Subject: [ICOM] Raspy CW note on IC751A
>
> Good afternoon all, I recently purchased a used IC751A on Ebay and added
> the narrow CW 455khz 250 hz filter to this radio.  I find the CW note on
> RX is very raspy sounding while the same station on my 746pro is quite
> pure sounding.  Any suggestions before I start pouring through manuals
> and reported fixes on the internet?  I am seeing this on the 40 meter
> band but due to few signals anywhere else don't know if all bands are
> affected or not.  Could this be symptoms of defective trimmer capacitors
> I have read about elsewhere?
>
> Thanks in advance.de gary, kd9sv
>
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