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K0CQ > QRP 17.09.02 21:25l 20 Lines 606 Bytes #999 (0) @ WW
BID : 11407_W0AK
Read: GUEST
Subj: for VK6JY @ VK6JY.#ALY.#WA.AUS.OC
Path: DB0ZKA<DB0KFB<DB0GAP<DB0BOX<DB0MRW<OK0PPL<RZ6HXA<IK1ZNW<HR2PAQ<WB7AWL<
N4ZKF<N0IA<N0IA<K1UOL<N7QDN<N7QDN<KA7AGH<<W0AK
Sent: 020916/1648Z @:W0AK.#CIA.IA.USA.NOAM #:11407 [Des Moines] $:11407_W0AK
From: K0CQ@W0AK.#CIA.IA.USA.NOAM
To : QRP@WW
Power MOSFETS at RF
The most popular have been the IRF511 because it has a much smaller input C
(and feedback C) than most of the power MOSFETS. There have been several
articles in QST and ARRL handbooks. Many power MOSFETS have input capacitances
of a nanofarad or greater which makes for a great RF short circuit. Or at
least a very high Q tuned circuit when trying to achieve a few volts of gate
drive.
73, Jerry, K0CQ @ W0AK.#CIA.IA.USA
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