While such a tuner might be fun to work with, it would unfortunately
have a very short life due to burnout of the relay contacts when
tuning at full power. There are also very high voltages created for
various combinations of L and C while tuning is going on, which would
undoubtedly shorten the life of the other components.
For such a tuner to work, it would need the ability to have the
exciter drop to low power while tuning, then return to full power
when the tuning task is done. This is far worse than telling the
tuner before transmission occurs the frequency for operation.
Note that this same situation exists whether the tuner needs to tune
for each transmission or it has frequency memories. Quite simply, the
problem is switching the relays at full power.
My belief is that the best way to handle the situation is to
communicate the operating frequency to the tuner so it can use its
memories, or to send the actual relay settings whenever they need to
change. Of course, this should be done during receive, when no power
is applied. This is the method used in the K2 tuners, and I am sure
Wayne is also doing it in the K3 ATU.
It's awfully hard to do in a remote tuner, although perhaps the best
example is the method used in tuning the Steppir (which uses
frequency data from the radio).
On Sep 7, 2007, at 9:08 AM, Edward Dickinson, III wrote:
...remote tuners is for a tuner that tunes itself for a match and
which does
not require to be given band data from the rig. ...
73,
Geoff
GM4ESD
-----------------------
Hi Greg.
I support your notion.
Regards,
Dick - KA5KKT/4
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