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FRB 6 Watt RF
Amplifier Kit |
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Assemble by soldering the
components to the pads indicated. Keep coil, resistor, and capacitor leads as
short as possible. The coils should be 3/16" to 1/4" above the
board and separate turns by one wire diameter. Bend leads to form a little
mounting foot for soldering to the circuit board. Tuning and power output are
affected by the distance between the coil turns, you can make fine
adjustments by either spreading or compressing the coil slightly. The area
surrounding the pads is ground. C2, C3, C4, C6, C7, C8, C9, C10, L2, and R1
are soldered at one end to ground as well as the shield braid on the coax
cables. Bolt Q1 to a small heat sink or the chassis with heat sink thermal
compound or gray thermal pad underneath the tab. With an input level of
200-500mw, you should see an output of 5-6 watts. Be sure to have a proper
dummy load (50 ohms) or tuned antenna connected to the output, doing
otherwise will likely destroy the transistor.
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