This is the schematic for a FM transmitter with 2W output power that
can be used between 85 and 110 MHz. Build the transmitter in a RF-proof casing, use good connectors and cable and
be aware of all the other RF rules of building. Q1 and Q2 should be cooled with a heat sink. the 22pf variable
capacitor is for the frequency adjustment. The another trimmer must be adjusted to maximum output power with minimum
SWR and input current.
Component
|
Value
|
Q1,Q2
|
2N3866, 2SC1971 or 2N3553
|
L1
|
5 turns of 0.8 mm wireon 5 mm body with ferit core
|
L2
|
2-4 turns of ordinary Cu-PVC isolated wire over L1
|
Note : Local
laws in some states, provinces or countries may prohibit the operation of this transmitter. Check with the local
authorities
Reference : Max Transmitters
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|