Saturday, July 23, 2011

Re: [HamBrewers] Indestructible RF Transistor

 

Yes used zener protection between SOURCE and DRAIN even on gate.

Yes used resistor in series with capacitor for negative feedback in between the GATE and SOURCE for stablization.

Also used  lowpassfilter/ PI network before gate.

But My experience is real bad using LDMOS which is in Video,
Personal experience, LDMOS cannot be used in SSB or AM, , baising them for linearity results in smoke and shortcircuit. LDMOS is only for FM & CW working.

Better turned to RDMOS.


VU3SXT 73's




On 22 July 2011 18:34, Raj <vu2zap@gmail.com> wrote:
 

Perfect one for us!

An IRF510/511 with a TWISTED & HARD wired resistor between the GATE and SOURCE to make sure it never comes off when over heated till solder melting point.. helps.

A zener type protection between SOURCE and DRAIN will help too..

Anyone tried these?


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