MFJ-939K plug & play for Kenwood
HF automatic tuner 1.8–30 MHz, 200 W SSB/CW, 6–1600 Ω, 20,000 memories, with cable for Kenwood
The MFJ-939K is a plug & play automatic tuner that tunes the antenna as you tune the radio: it covers 1.8–30 MHz from 2 W QRP up to 200 W SSB/CW and matches impedances from 6 to 1600 Ω (SWR up to 32:1). This version has the cable for Kenwood transceivers.
Product description
It measures the antenna's complex impedance (R, X), calculates the L network and immediately switches in the required components. With 256 capacitance and 256 inductance values it has 131,072 combinations. The adaptive search only explores safe solutions, and instant recall uses the 20,000 memories, divided into 8 banks of 2500 for as many antennas.
An audible SWR indicator signals values below 1.5, 2, 2.5 and 3 and sounds an alarm above 3. The L network uses 10 A/1000 V relays and silver-mica capacitors. It tunes coax-fed antennas and long wires.
Key features
A single cable to the Kenwood radio.
SWR up to 32:1.
8 banks for 8 antennas.
Compatibility and notes
Versions MFJ-939I and MFJ-939Y are available for Icom and Yaesu. If you change radio, just order the matching cable.
Specifications
| Frequency | 1.8–30 MHz |
| Power | 2–200 W SSB/CW |
| Matching range | 6–1600 Ω (SWR up to 32:1) |
| Memories | 20,000 (8 banks × 2500) |
| L/C combinations | 131,072 |
| Connectors | SO-239, terminals for long wire and ground |
| Dimensions | 6½ × 2⅞ × 8⅜" (about 165 × 73 × 213 mm) |
| Weight | 2.4 lb (about 1.1 kg) |
HamRadioShop | Automatic tuners
