Whatever happened to "silent tuning?" I know it's not entirely silent, but
monitoring across a dummy load with a bridge circuit means the auto
tuner/matcher can sniff the incoming rf and adjust for best match/tune and
then switch to full connection. On most HF bands, say >20m, there might be
only one optimum point in the middle of each sub-band, so re-tuning/matching
would not delay things by much.
David
G3UNA
----- Original Message -----
From: "Jack Brindle" <[EMAIL PROTECTED]>
To: "Elecraft Discussion List" <elecraft@mailman.qth.net>
Sent: Sunday, September 09, 2007 4:15 AM
Subject: Re: [Elecraft] Balanced AT
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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- Jack Brindle, W6FB
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