[SignalOne] Re: CX-7 Driver Board

[John Seboldt]

At 09:59 AM 1/11/03 -0800, you wrote:
>Well, worked on the CX-7A again today, checking bias, etc. All seemed OK.
>I had replaced the FET (Q1) on the driver board some time ago, with a
>3N201, which one of the Newsletters said was a good replacement. Out of
>desperation, I popped in an MPF-102 I had, not expecting it to work.
>
>Bingo! I got drive! In fact, a lot of drive. I backed down R-19 to about
>halfway. Checked the signal though, and it's "good" RF, not oscillating.

I wonder if your 3N201 was blown... or (isn't this a 2-gate device?) to put 
it in place of a single-gate MOSFET, you have to tie both gates together.

But interesting that the lowly JFET will work too.

Hurrah for the troubleshooter!

John K0JD
Milwaukee