[Amps] Tuner Loss
n8de at thepoint.net
n8de at thepoint.net
Thu Mar 10 08:27:27 PST 2011
Paul is absolutely on point!
The major reasons for excessive heat in a tuner include (but are not
limited to):
Wire used for loading/tuning coil is too small gauge
Slider/roller on roller coil is NOT tight against the coil due to poor design
Roller coil contact is of poor material which 'burns' under load
Coil core (if not air) is lossy under load
Interconnecting wires within the tuner are too small guage
LOUSY SOLDERING within the tuner
The list can be added to, but these are the primary reasons.
73
Don
N8DE
Quoting Paul Christensen <w9ac at arrl.net>:
>> All tuners have losses. Losses create heat. You can't change physics.
>
> But you can do a reasonably good job of avoiding the problems associated
> with physics if the underlying physics is understood. All tuners have loss.
> Some designs have less loss than others. A well-built ATU that can
> accommodate 1KW of power across a generous range of load impedances does not
> require a cooling fan. If an ATU product uses a cooling fan, it's time to
> start asking tough questions of the manufacturer.
>
> Paul, W9AC
>
>
>
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