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LF: Advice will be gratefully received

To: "LF Group (E-mail)" <[email protected]>
Subject: LF: Advice will be gratefully received
From: "OSBORN, Chris" <[email protected]>
Date: Wed, 28 Sep 2005 10:43:34 +0100
Delivery-date: Wed, 28 Sep 2005 10:45:03 +0100
Envelope-to: [email protected]
Reply-to: [email protected]
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        The PA FET's in my new home brew transmitter keep exploding !

        I'm using push-pull  IRF520's rated at 100 V Vds and my supply is 30
volts.
        I am careful not to exceed the V gs.

        The gates are driven with a toroidal transformer and the whole
circuit is just a scaled up version of my original TX, which works fine.
        It generates healthy power into a 50 ohm dummy load but on
connection to the aerial circuit - bang !
        The aerial system is identical to that used with the old TX !

        Has anyone any ideas on what's causing the problem and how to cure
it ?

        I'm running out of FET's and my nerves are somewhat frayed (shell
shock!)

        73 Chris G3XIZ

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