I believe if you don't select a band, the tuner has another four memory
settings. That makes 32. I looked into this a few years ago...didn't recheck
this but I believe I used the non band selected four in the past. I used a
manual band switch on the desk to select one of eight positions (position 0
being no connection) and then the four antenna switch settings.
Chuck, KE9UW
> -----Original Message-----
> From: tentec-bounces@contesting.com
> [mailto:tentec-bounces@contesting.com]On Behalf Of Ken Brown
> Sent: Friday, August 27, 2004 19:31 PM
> To: tentec@contesting.com
> Subject: Re: [TenTec] Re: Model 253 Autotuner
>
>
> Peg Haese wrote:
>
> >Chuck, would you or anyone else care to say exactly what 253 tuner
> >refinements are necessary? I got one several months ago for the
> Omni V and
> >Herc II but have never hooked it up. I did get a cable from
> Riley's for the
> >trio.
> >
> >
> The Ten Tec 253 Auto Tuner has only 28 memory tune settings. These are
> arranged as 7 bands X 4 antennas. Depending upon how you choose to
> define the 7 band selections, seven may be enough for you. However, if
> you count all of the present day ham bands (not including the 5 MHz
> channels, they are channels and not a band.) your count will probably be
> greater than seven. Some people have worked around this limitation by
> either using the antenna switch to only select one of four memory banks,
> not using it as an antenna switch at all, or perhaps using it to select
> only two antennas, with 2 X 7 = 14 tune memories for each antenna.
>
> If you interface the 253 to a Ten-Tec Omni or Paragon, for automatic
> band selection, the bands will be: 1.8-2.5, 2.5-4.0, 4.0-6.5, 6.5-12.5,
> 12.5-15.0, 15.0-22.5 and 22.5-30.0 MHz. That is only one memorized
> tuning for 160 meters, only one for 80 and 75 meters combined, only one
> for 40 meters and 30 meters combined, only one for 17 meters and 15
> meters combined, and only one for 12 and 10 meters combined. Again, you
> could have as many as 4 memorized tunings for each of the above listed
> "bands" if you give up the antenna switch function, and just use that
> switch for a "memory bank" selector.
>
> I would like to have two or three memories for 160 meters, and two or
> three for 80/75 meters. It would be nice to have two on 40 meters also.
> I would be happy with just one for each of the other bands, as long as
> each band is a separate band, not 17/15 combined or 12/10 combined.
>
> Yes the 253 has an autotune function, so in theory you don't need any
> memories as long as you don't mind waiting for the process to complete
> and enduring the noise of the tuner going through it's paces to get
> tuned. You have to transmit to make the autotune function happen. I
> would like to switch bands, and have the tuner set up for each band,
> without having to transmit. That way I can listen to each band, with the
> antenna system tuned correctly, to decide whether I am interested in the
> way the propagation on a band is at any given time. The 253 can do that
> as long as you choose the seven bands you really want. If Ten-Tec had
> used those seven "band select" lines as seven bit parallel binary,
> instead of only one out of seven select, there could have been 128
> memories per antenna,(with the right memory chips in the 253). Maybe
> the band frequency divisions could have been entered through some
> commands in the "User Options Menu" of the Omni.
>
> DE N6KB
>
>
>
>
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