Low-Power (3 to 30 MHz) transmitters constructed by hams are generally called QRP. For transmitters of a finely tuned antenna impedance is must.If not fit properly there will be little or no output.But if adjusted properly, there will be great to match results.A circuit antenna properly with the transmitter ID are below.
Transmitter output is given to the input of the tuner (connector BNC1). The output of the tuner (connector BNC2) antenna.Then must be connected to L1 and C1 adjusted for maximum transmission power.The transmission power can be checked with an SWR meter.
Transmitter output is given to the input of the tuner (connector BNC1). The output of the tuner (connector BNC2) antenna.Then must be connected to L1 and C1 adjusted for maximum transmission power.The transmission power can be checked with an SWR meter.
Notes.
- Assemble the circuit on a goos quality PCB or common board.
- If the matching is not satisfactory then change the values of L1,C1,C2&C3 to the next close value and tune again.
- Proper tuning requires some trial and error.
- The circuit can be enclosed in an aluminum casing for better performance.
