[ICOM] IC-746 Tuner Problem

[D C *Mac* Macdonald]

To all:
 
Thanks for the comments.  The failure to tune is
a very recent situation.  It has been working
just fine for several years.  It's either an
internal tuner failure (my suspicion) or an
antenna problem.  Since it is okay at 3.8999
and kaput at 3.9000 MHz, I'm pretty sure it
is a tuner problem.  I will try to identify
the relay mentioned in one of the replies.
 
I'm no longer able to climb to inspect the
antenna.
 

* * * * * * * * * * * *
* D C "Mac" Macdonald *
* Amateur Radio K2GKK *
* USAF & FAA, Retired *
** Oklahoma City, OK **
* * * * * * * * * * * *


* "An unarmed man can but flee *
* from evil. Evil can NEVER be *
* overcome by flight FROM it." *



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> Date: Thu, 4 Nov 2010 10:40:35 -0700
> From: k4lxv at bellsouth.net
> To: icom at mailman.qth.net
> Subject: Re: [ICOM] IC-746 Tuner Problem
>
> Mac; Most built in tuners can only match an SWR of 3:1 or lower. Try adding a few more feet of feed line if possible to hopefully present a load within the matching range.
> Larry K4LXV
>
> --- On Thu, 11/4/10, George J. Nixon Jr. wrote:
>
> From: George J. Nixon Jr. 
> Subject: [ICOM] IC-746 Tuner Problem
> To: "ICOM Reflector" 
> Date: Thursday, November 4, 2010, 1:01 AM
>
> Check the SWR!! Perhaps it is so high above 3.900MHz the automatic tuner can't handle it.
> = = = = = = = = = =
>
> --- On Wed, 11/3/10, D C *Mac* Macdonald wrote:
>
>
> From: D C *Mac* Macdonald 
> Subject: [ICOM] IC-746 Tuner Problem
> To: "Icom Forum" 
> Date: Wednesday, November 3, 2010, 10:35 PM
>
>
>
> For some reason, the onboard tuner has decided to
> quit tuning on 80 meters above 3.9 MHz.
>
> Any ideas where to look?
>