[ICOM] AT 500 Tuners

[Michael P. Olbrisch]

Not totally correct.....

> -----Original Message-----
> From: icom-bounces at mailman.qth.net
> [mailto:icom-bounces at mailman.qth.net]On Behalf Of JerryM
> Sent: Saturday, December 18, 2004 3:41 AM
> To: icom at mailman.qth.net
> Subject: [ICOM] AT 500 Tuners
>
>
> Re the AT 500 tuner. If you use the existing SO-239's on the
> back of the tuner, you have 5 bandswitched ports for the 5 bands.

You have 4 switched outputs and ONE input.  Confirmed by a visual
inspection, as well as page one of the owners manual clearly stating that
output terminals = 4.

> IF you pull the serial number plate you will find a prepunched
> hole exactly 239 sized. You can install a 6th 239 there

It WILL be a 6th connector, but will only allow a 5th antenna - owners
manual page 7.

> and wire it to the common feed thus letting you use for instance
> a 160 mtr off center fed dipole on all bands from 160 to 6

I have not tried 6m, but the specs on page 1 state 1.8 to 30 MHz - 16.7 to
150 ohms resistive.  Try this at your own risk.  I cannot see any reason why
it won't switch the antenna in the "THROUGH" mode, but I would be cautious
about trying 6 in the "TUNED" mode.

> (bever tried 2)  with the tuner matching anywhere you want to go.

Let me know if it tunes 6m.  Replacement parts are getting hard to get for
these tuners, I don't want to risk mine.

Mike.  KD9KC
El Paso, TX.