On 4/16/2010 8:44 PM, k7fm wrote:
> Well, you can have a broadband input - well sort of.
>
> Assuming you have excess driver power, you could dissipate the extra
> power in a swamping resistor. Determine how much power is to be
> absorbed by the swamping resistor. Then, since you know the input
> load and load of the amplifier tubes, you will use an unun to match
> impedances and also provide a low impedance load for the final cathode.
>
> Then you will also not have to worry about overdriving the final tube
> and relying on ALC.
>
> 73, Colin K7FM
>
Colin: Drive power is 100 watts to a 4PR1000 with 5000v on the
anode. I (think) it will make near legal limit output
with a 200 ohm resistor and a 4:1 unun. Will such an input screw up
the IMD without a tuned circuit,
or is a QRP signal (<1500W) unlikely to be noticed on 160 or 75M? I
don't mind experimenting, but I HATE
loud, expensive noises!
Mike W5CHR
Memphis
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