Thanks - that explains it nicely.

"Dave Platt" wrote in message
...
In article , Airy R. Bean
wrote:
I forgot the SPC, but that appears to need a differential
capacitor that I haven't yet obtained (or made).
I don't think that's a specific characteristic of the SPC - it seems
to be true of T tuners in general. The T configuration does provide a
wide matching range, but in the case of very low-impedance or highly
reactive loads the "match" may result in extremely high circulating
currents through the coil, with the resulting high losses. A "T"
tuner with sufficient reactance in the components may let you
establish a "match" for a short-circuited load... but you'll end up
dissipating almost 100% of your power in the coil. The SPC probably
shares the same characteristic.