Use a 250 to 300 ohm 50-100 watt non-inductive grid swamping resistor and
make a 5 or 6 to one broadband torroid input matching XMFR. Can then be
driven with less that 100 watts. I believe AG6K has this stuff available on
his web site. Instructions to make the broadband torriod XMFR can be found
in the ARRL Handbook. This tube should be neutralized in this grid driven
configuration.
Good Luck,
Terry W6RU
----- Original Message -----
From: Bruce plantin <plantin@adtech1.oceaneering.com>
To: <amps@contesting.com>
Sent: Wednesday, June 09, 1999 12:26 PM
Subject: [AMPS] grid voltage swing
>
> Larger tubes such as a 4CX3000A require very little drive power, but the
required grid voltage swing is very high.
> What is the proper or most commonly used method of deriving this voltage
swing from the standard 50 ohm driving source? I have not looked at the data
sheet lately, but believe its over 200 V P-P for the 3x4.
> I have justed started looking at this reflector. Can anybody help?
>
> Regards,
> Bruce W3BP
>
>
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