[Amps] HF RF amplifier negative feedback

[R at contesting.com]

On Apr 27, 2006, at 11:40 AM, Ronald, Douglas S wrote:

> Amps fans,
>
> I have only subscribed to this reflector for a few months, however I
> have never seen any discussion on negative feedback in linears to 
> reduce
> distortion. I plan on feeding a few pf's from the 4CX10000D plate back
> to the driver cathodes in a capacative voltage divider configuration.

This should make it possible to secure output at some frequency in the 
VHF range without the need for a driver.

> (why a 4CX1000D?, because I have 4 of them with sockets) This topology
> should be frequency independent. I'm planning on a neutralized class A
> amplifier, and from10 to 20 dB of feedback. I wonder if anyone has
> successfully done this, and why it isn't done more frequently?

Because the need for oscillators is not frequent these days.

> There
> must be a can-of-worms here I'm not aware of...

With a 4cx10,000D, large worms.
>
> Thanks all,
> Doug Ronald
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Rich Measures, 805.386.3734, AG6K, www.somis.org