"Andrew VK3BFA" wrote in message
ups.com...
and I forgot - the loading capacitor can be a 3 gang (typical) broadcast
band one - old valve radio ones are fine. Its low impedance, so you
dont need to worry too much about rf volts.
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When transmitter ouput is 100 W then @ 50 Ohms the V(peak) equals 100V
when output is 400 W then @ 50 Ohms the V(peak) equals 200 V
when output is 1500 W then @ 50 Ohms the V(peak) equals 386 V

So for 400 W output or perhaps a bit higher a good quality air spaced BC
variable capacitor should be OK

Frank GM0CSZ / KN6WH