I was told at the factory that if the auto-tuner was controlled by being
connected to the Omni/Hercules combo, the EPROM was not being "used up";
that that only occurred when it had to find the low SWR setting on its own.
I bought an extra EPROM several years ago, but have not found the need to
replace it so far.
I use the tuner inline with the Omni/Hercules when setting up on a frequency
and then switch over to the Icom 756Pro/QRO amp combo AFTER the tuner has
"remembered" the correct settings.
I agree with the second part of your comments concerning the loss of memory
if the tuner is switched off and the band changed. It does indeed lose its
position memory.
Duane Budd
w5ben@arrl.net
Date: Tue, 24 Aug 2004 20:11:16 -0500
From: "Chuck (Jack) Hawley" <c-hawley@uiuc.edu>
Subject: RE: [TenTec] Re: Model 253 Autotuner
To: <tentec@contesting.com>
Message-ID: <LPBBIIAJGNDLJCFBBLGAKECFOGAA.c-hawley@uiuc.edu>
Content-Type: text/plain; charset="iso-8859-1"
The auto tuner seems to need a new eeprom after repeated auto tuning...say
about a year. The fix for this was to put a socket in for easy replacement
of the eeprom (Ten-Tec). This shows up as a loss of one or more of the
memory positions (the memory of the tuning at a particular antenna switch
setting and band setting...there are 32 memory locations
altogether...combinations of antenna switch position and band info input).
The second thing I noticed is that if you turn off the tuner, and change the
band input with the tuner off, turning the tuner on now will cause a loss of
where the roller inductor is as far as the memory is concerned. The stored
settings will be wrong until you do a "realignment" of the roller coil so
the micro knows where it is.
Neither idiosyncrasy is a big deal...would be nice not to have them.
I also wish I had a better sense of where the roller coil and capacitor
settings were for a particular tuning. I thought of putting a 10 led display
in...or maybe a 10 bit DAC and a meter...and something for the roller coil.
But, I still love this thing.
Chuck, KE9UW
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