2N6084 144MHz FM Power Amplifier



I built the PA board for this when I was a foundation licencee, but under the foundation licence, you must only use comercially made transmitters. Since getting my intermediate licence, I have put it in a box, and added an RF sensing switch so I can use it. It uses a 2N6084 RF transistor, and will produce 50w output max. It is a class C amplifier design, and therefore good for FM mode only. I have tried using the 2N6084 in class A, but amplifier gain was down to about 4dB and it seemed a but pointless!

Input Power
Output Power
2.5w
10w
4w
20w
7w
30w
10w
40w
13w
50w

Some people requested a schematic of the PA board, so I drew one up.
Click here for PA schematic.


Inside the box


RF Sensing circuit & DPDT relay switch


The power amplifier


Back of the box

Click for full schematic!
Schematic of the PA board. CLICK IT FOR LARGE VERSION!


Schematic of the RF switch