MFJ-939I plug & play Icom
Plug & play HF automatic tuner 1.8–30 MHz, 2–200 W, 6–1,600 Ω, 20,000 memories, with cable for Icom radios
The MFJ-939I is a plug & play automatic tuner for HF (1.8–30 MHz) that matches coaxial and random wire antennas from 2 W QRP up to 200 W in SSB/CW. This version comes with the cable for Icom radios: no settings, just one cable to connect.
Product description
It matches impedances from 6 to 1,600 Ω (SWR up to 32:1). It measures the complex antenna 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 AdaptiveSearch and InstantRecall functions make tuning very fast, and the 20,000 memories are organised into 8 VirtualAntenna banks of 2,500, one for each antenna connected via a switch. An audible indicator reports SWR (< 1.5, 2, 2.5, 3) and gives an alarm above 3.
The L network uses 10 A / 1,000 V relays and silver mica capacitors. It is as small as a radio and made in the USA; if you change radio, just order the right cable (K versions for Kenwood and Y for Yaesu).
Key features
One cable, no settings.
Matches random wires too.
8 VirtualAntenna banks.
From QRP to 100 W.
Specifications
| Frequency | 1.8–30 MHz |
| Power | 2–200 W SSB/CW |
| Matching range | 6–1,600 Ω (SWR up to 32:1) |
| Combinations | 131,072 (256 L × 256 C) |
| Memories | 20,000 (8 banks × 2,500) |
| Components | 10 A / 1,000 V relays, silver mica capacitors |
| Connectors | SO-239, terminals for random wire and ground |
| Dimensions | 6.5 × 2.9 × 8.4" (approx. 165 × 73 × 213 mm) |
| Weight | 2.4 lb (approx. 1.1 kg) |
| Cable included | Icom |
HamRadioShop | Antenna tuners
