Hi Paul, there is no reason the tuner "has" to be inside the amplifier is
there? If so, maybe a tuner can be scavenged for the application.
When you pick a tuner, it needs to be a unit that retains the relay
settings when turned off. Otherwise, it will be hunting as the amplifier input
Z
varies with speech waveforms etc.
There have been LDG models in the past used for QRP/portable work that
operated this way to help conserve battery power. Their specs should cover this
issue.
73,
Gerald K5GW
In a message dated 10/9/2010 6:24:58 A.M. Central Daylight Time,
paul@n1bug.com writes:
Lee Buller wrote:
> But, I picked up the ARRL Handbook this morning on the way to the
"reading room"
> and saw a project that used a commercial auto tuner to do the job of the
input
> matching. It is an LDG autotuner they sell without a box.
This isn't in any of the Handbooks I happen to own. I tried looking
on LDG's web site but found no autotuner without a box. Maybe it is
a special order item? Does anyone have more info on this?
I am looking for some way to get better SWR on my homebrew amp
input, and make it more consistent across all bands. It is a
homebrew cathode driven 4CX1500B and I have no real idea what the
tube input impedance is. I opearate 99.9% CW so an autotuner might
be an attractive option *if* I can fit it in the box.
73,
Paul N1BUG
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