Hi Rob,
The gate voltage/pot bias method is a nice way to vary the bias; I've used that method for many years on the various active whips I've built, both for hobby and at the company before I retired. I used to do a lot of IMD tests at work; now I do it for fun. :)
I haven't tried either circuit in a balanced/differential arrangement though.
73,
Steve
toggle quoted message
Show quoted text
----- Original Message -----
From: "Rob Moore" <rmoore5@...>
To: <loopantennas@...>
Sent: Tuesday, June 05, 2007 9:10 PM
Subject: [loopantennas] Re: Active antenna design
Thanks Steve,
I didn't have the article open at the time and had forgotten about
the pot that Dallas had. It amounts to sort of the same thing -
varying the DC bias on the gate - but keeps the impedance relatively
constant.
I'm aware of IP2 and IP3 although I've never measured them. One of
these days I'll set up the proper equipment to do that. Have you
ever tried either of these circuits in a balanced/differential
configuration?
Rob
