Automatic Tuner - SG 230
"In the former Yugoslavia, we had about 100 of these tuners. One morning, the radio operator called me saying that the SWR instrument had a water leak. She had put the saucer of her coffee underneath so as not to let a lake create on the table ...
Curious to see why! Effectively the coaxial cable had become a water pipe. Going up on the roof, in winter, seeing nothing abnormal, I opened the lid of the tuner. The electronics were a block of ice that melted in the sun, and water flowed inside the coaxial cable that went to the radio station."
Curious to see why! Effectively the coaxial cable had become a water pipe. Going up on the roof, in winter, seeing nothing abnormal, I opened the lid of the tuner. The electronics were a block of ice that melted in the sun, and water flowed inside the coaxial cable that went to the radio station."
Peter Kunz - HB9MCL
SG 230 automatic antenna tuner
Automatically matches the antenna impedance to that of the transmitter in order to transmit with maximum efficiency. Tunes in any piece of wire used as an antenna.
Technical sheet:
It was necessary to install this box as close as possible to the antenna, without forgetting to provide it with a good earth connection. Many of these tuners worked in a delta-loop configuration. On the other hand an antenna with one end to the mass gave protection against lightning. At the radio station, a tuning control device was needed (SWR-meter).
Automatically matches the antenna impedance to that of the transmitter in order to transmit with maximum efficiency. Tunes in any piece of wire used as an antenna.
Technical sheet:
- Automatic tuning of antennas from 2 to 30 MHz with a SWR (standing wave ratio) less than 1.5
- No control cable needed, everything is in the box
- Automatic measurement of the tuning frequency
- 24 mechanical relays switch a series of filters in Pi in order to achieve the tuning
- Memorization of the position of the relays in a non-volatile memory
- 12Vdc power supply, max 1A
- Different operating configurations possible
- Good waterproofness given the outside exposure.
It was necessary to install this box as close as possible to the antenna, without forgetting to provide it with a good earth connection. Many of these tuners worked in a delta-loop configuration. On the other hand an antenna with one end to the mass gave protection against lightning. At the radio station, a tuning control device was needed (SWR-meter).