On Wed, 3 Jan 2007 21:38:14 -0000, "ray" wrote:

+++
+++"Telstar Electronics" wrote in message
egroups.com...
+++ These transistors cost $69.95 at RF Parts
+++ This is a fantastic deal...
+++
+++You forget they do not work in a CB! That is a MOSFET so a number of
+++changes would be required to the circuit. You also need to accommodate it
+++which might be difficult as the rest of the board was designed around a
+++TO220.
+++The frequency range is too high so no chance of much gain on 27MHz.
+++Go and do some research.
+++
**************

Go and do some research. Gain increases as frequency decreases. The
major problem of using this device at 27 MHz is keeping the gain low
enough so that the amp will be stable. Any amp using this part at
27MHz will have to have a lot of feedback to minimize gain.

Also FET large signal impedances are not all th at different from
bipolar devices. With RF power amps you are more interested in the
large signal characteristics of the device and not the small signal
characteristics. This device would make a decent preamp for 27MHz if
you can make it stable. Would have a excellent 3rd order intermod
characteristics also.


james