[Icom] IC-765 tuner problem

Sat, 11 Jan 2003 08:29:54 -0500

Gee,

The 765 tuner is not designed to deal with the HIGH Impedance that a
long wire can represent across the antenna port (and internal circuits).
That condition could (and probably did) result in HIGH Voltages across
the tuning components to which they are not designed for...... Hope that
you are lucky in not blowing some of the tuner's capacitors.

When using a long wire, turn the 765 tuner off and use an external tuner
designed to deal with such an antenna.

Ron ..... NU1U

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of [email protected]
Sent: Friday, January 10, 2003 01:46
To: [email protected]
Subject: Re: [Icom] IC-765 tuner problem

Hello,

I have tried the adjustment procedures found on the various mods sites.
However the problem is not one of tuner hunting.

I've been using a multi-band dipole and wanted to compare it
to a longwire with a tuner. The 765's tuner worked fine on the dipole.
When I switched to the longwire it started acting up. Once I get it to
actually tune with the longwire, it then behaves normally and quickly.
If I then switch back to the dipole the problem will again occur.

I recently aquired a dip meter and do realize that my antennas are not
perfectly tuned.

73,

Don

On Thu Jan  9 19:52:21 2003 [email protected] (Tony Hwang) wrote:
> 
> Hi,
> Worth going thru the tuner alignment but if you replace those two adj.
> pots with multi-turn ones
> it'll be much easier to adjust.  Pots in there are too jumpy. Do you 
> have a  noise bridge or dip meter?
> Handy items when working on antennas. What is your new antenna?
> 73,
> Tony, VE6CGX
> 
> Floyd Sense wrote:
> 
> >Check out the 765 tuner adjustment procedure under Icom 765 at this 
> >site: http://www.mods.dk/
> >
> >K8AC
> >Floyd Sense in Angier, NC
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