[ICOM] IC-725 PLL Problem

[D C *Mac* Macdonald]

I tried to send a list of three on-line manual
sources, but the message was rejected by
qth.net.  I think maybe the server doesn't
like URL listings and considers them as spam.

I'll try again with the "h t t p : / / w w w.
omitted.  You will have to reinsert them
manually to actually go to the sites.

73  ---  Mac, K2GKK/5
Oklahoma City

   marcucci.it/english/download/index.htm

   icom.co.jp/world/support/download/Amateur.html

   qsl.net/icom/manuals.htm



----Original Message Follows----
From: Dave Noon <va3dn at execulink.com>
Reply-To: ICOM Reflector <icom at mailman.qth.net>
To: ICOM Reflector <icom at mailman.qth.net>
Subject: Re: [ICOM] IC-725 PLL Problem
Date: Thu, 11 Aug 2005 10:02:16 -0400

Hi Tim:

Thanks for your reply.

The PLL is unlocked on all frequencies. I read a note on a review board that 
some of the IC-725's had this problem because the unit was not correctly 
'burned in' at the factory. The fellow that wrote the note indicated that 
there was a fix - I wrote him a note but he did not send me a reply.

I will try and get a schematic, and then perhaps you can give me some tips 
on where to start.

I appreciate your taking the time to send me this information.

73  Dave  VA3DN

At 12:17 AM 8/11/05, you wrote:
>Hi Dave,
>
>  Depends if the unit is unlocked on all frequency's or if it is just
>partially unlocked. Most of Icom PLL units used a trimmer capacitor that
>after they have aged fail and need to be replaced with a higher quality
>ceramic trimmer. This failure usually causes a range of freq to either
>warble or lose tx and rx. The IC-725/726 also has the DDS Loop that drifts
>and there is a coil (L30)that has to be adjusted by spreading the turns of 
>a
>coil to the correct voltage at 14.12650MHZ.
>Let me know if this helps out or more detail on how it is unlocking.
>
>TNX.... Tim   wd0fkc
>Tim Moes  wd0fkc
>www-midwest-technical.com
>----- Original Message -----
>From: "Dave Noon" <va3dn at execulink.com>
>To: <icom at mailman.qth.net>
>Sent: Wednesday, August 10, 2005 7:25 PM
>Subject: [ICOM] IC-725 PLL Problem
>
>
> > Can anyone tell me how to fix the IC-725 "PLL Problem".
> >
> > Thanks
> >
> > Dave  VA3DN
> >
> >
> > Amateur Radio VA3DN
> > va3dn at execulink.com
> >
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> >
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>Icom FAQ: http://www.qsl.net/icom/

Amateur Radio VA3DN
va3dn at execulink.com


----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/