Thanks for the information!

Yes, I have to push the Tune button on the 706 and the relays rattle
and then the red LED light on the 706 lights up. The built in SWR
meter shows a 3:1 SWR. I can change the frequency on the 706 and get a
lower SWR.

I have noticed that the tuner does not "Tune" for very long. No where
as long as the DX70 took and it seems like maybe the "tune" process is
being cut short. When I change bands, it takes just a half a second to
tune which seems way too fast.

Is this information give any more clues to what is going on?

Hmmm.

I had a possibly-similar problem when I tried to use an SGC autotuner
with my Kenwood TS-2000. The two don't get along very well - the SGC
often fails to achieve a match. This occurs when I use the Kenwood's
external-tuner feature (which sends a 10-watt signal), or if I
transmit CW or SSB. Sometimes the tuner wouldn't start to tune, other
times it would chatter indefinitely and never achieve a match.

The SGC tunes up the same antenna just fine with a Ten-Tec Scout
sending 5-10 watts.

I concluded that the problem was likely due to two factors:

- The Kenwood's fixed 10-watt tuning signal is at the low end of the
SGC's acceptable range.

- The Kenwood's finals have a power-limiting (or power-foldback)
high-SWR protection circuit. As the SGC tried different relay
settings with different match-component combinations, and the SWR
seen by the Kenwood varied, the Kenwood's power output jumped
around... it would reduce power on the higher SWR combinations.
This apparently "confused" the SGC - either dropping the power
below the level that its SWR bridge was designed to sense
accurately, or causing the match-search algorithm to interpret a
better match as a worse one.

The tuner worked fine with the Ten-Tec, which doesn't have a
power-foldback SWR protection circuit.

Now, as to the rapidity with which the tuner finds a "match" when you
change bands, this might possibly be "as designed". Some tuners have
frequency-based memory capability, and will re-tune to what they
consider the best-available match without going through a full
match-search.

Doing a fast-match to a 3:1 SWR does seem odd, though.

I have a hunch that the 706 may be running into the same sort of
problem that the Kenwood TS-2000 did - its active high-SWR-protection
circuit may be altering output power in a way which confuses the tuner.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
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