Stupid Question Time RE Amp Load Control.

[Multi-Volti Devices]

It can also happen if
A) Antenna impedance is odd...low, high, mostly reactive.

or

B) Tank circuit switch wafer has vaporized contact that switches in
fixed 'padding' capacitors, usually on low bands. I think minimum
loading is fully meshed plates/maximum capacitance, so any padding caps
present that are removed from the circuit due to bad switch contact (or
cold solder joint) would leave the circuit "capacitance-starved", and
your maximum output would be at fully meshed plate rotation.

I've seen the former on an old rig when vaively trying to use a 80 M
inverted Vee on 40, where the impedance was very high...open circuit
looks similar until capacitor arcs over.

I've seen the latter on SB-1000's at Heath service dept.

Murray

Dan Pividal N4VET wrote:
>
> Is it common for an amps load control not to increase output power to the ant
> if the tuner match is 1to1?
> I can dip the amp with the tune control but advancing the load control beyond
> 1 actually causes a decrease in output. Is this normal?
> If not what can cause this condition.
> Amp seems to work fine.
> Dan
>
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