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RX3MS Helical Antennas

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ANTENTOP- 01- 2016 # 020

RX3MS Helical Antennas

 

 

Antenna was tuned with help of a tuner shown in Figure 4. The tuner could match all of three helical antennas with transceiver. Tuner matches with the transceiver with help of a triple variable capacitor 11- 75- pF It is a usual variable capacitor from an old tube receiver. However each second plate at the capacitor is deleted. Second capacitor C2 is air- dielectric capacitor with gap between plates 2-mm. Such ATU could afford RF-Power going through in 100- watts.

For L1 inductor it was used an old variometer with roller from ex-Soviet military transmitter. The ATU could be tuned by internal SWR- Meter of the transceiver or by a neon bulb. You just need to install proper capacitor to view glowing of the bulb. It is possible to tune the antenna system by FSM installed at the transmitting site.

 

All of the three antennas was tested at QRP Power and showed good result.

 

73! DE RX3MS

 

 

 

 

Figure 4 Antenna Tuner by RX3MS for his Helical antennas

 

 

 

 

 

 

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Last Updated:

April 2, 2016 22:48

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