Note
The Kenwood AT-50 is an automatic antenna tuner designed for flexible use in both mobile and fixed station environments. It is engineered to provide quick, reliable tuning across a wide range of frequencies, featuring specialized operating modes for both dedicated Kenwood transceivers and other radio equipment.
It was released as the matching automatic antenna tuner for the Kenwood TS-50S, which was marketed at the time as the world's smallest 100W HF ham radio transceiver. Both units were produced through the late 1990s.
Features
– Frequency Coverage: 1.8 MHz through 29 MHz.
– Automatic Mode: Enables "hands-off" operation when paired with the matching TS-50S transceiver, allowing the radio to control all tuning actions.
– Semi-Automatic Mode: Designed for use with other transceivers, this mode automatically senses low-level RF signals to begin tuning with minimal operator input.
– Local Automatic Mode: Allows for manual control from the front panel while still utilizing the unit's internal automatic tuning circuitry.
– Battery-Free Memory: Uses EEPROM to store all preset tuning positions, ensuring data is retained without the need for a backup battery.
– Thru Mode: Includes a setting to bypass the tuning circuit, sending the signal directly to the antenna.
Specifications
– Frequency Range: Amateur bands from 1.8 to 29.7 MHz.
– Power Limit: 100 W continuous wave (after tuning).
– Tuning Power: 6 to 20 W.
– Antenna Impedance Range: 20 to 150 ohms (approx. SWR of 2.5 or less).
– Input Impedance: 50 ohms unbalanced.
– Maximum VSWR: 1.3 or less after tuning.
– Tuning Time:
Initial: 30 seconds or less.
After Preset: 3 seconds or less.
– Operating Temperature: −20∘C to +60∘C.
Power Requirement: 13.8 V DC ±15%.
Current Consumption: 2 A or less.
