Re: [Amps] Tuner Loss

[n8de@thepoint.net]

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@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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