ZM-2 ATU (Antenna Tuning Unit)
The ZM-2 is a state of the art Antenna Tuning Unit. It is not just another standard tuner circuit repackaged. The ZM-2 has no inductance switching to mess with, just two variable capacitors to tune. And most times that is 1 to 1 SWR where other tuners only get close.
What Is Included In The Kit?
Everything but the elbow grease, solder, and tools! All parts are furnished including a front panel label as shown and either BNC or UHF (SO239) connectors. We include large knobs to help tuning because the ZM-2 tunes so sharp.
Is It Hard To Build?
An evening project for many, maybe two evenings for others. Easy pictorial assembly instructions. Check out build photos in the gallery. There is one large toroid to wind, and one small one to wind, but they are probably some of the easiest ones you’ll ever do.
Just What Will It Tune?
The ZM-2 tunes wire antennas: Random, Long, Short, “that’s all I had”… It tunes BALANCED fed antennas such as Loops, Deltas, Dipoles, Verticals, V’s! From field reports it has tuned: House Gutters, Window Frames, Swing Sets, Bedsprings, etc. It tunes out mismatch in COAX fed antennas to make the radio happy.
Is It An AutoTuner?
No, the ZM-2 is not an autotuner. But it still tunes fast! Approximate tune time on a strange new antenna is less than a minute
What Bands Will It Tune?
The ZM-2 will tune all bands from 80 to 10 meters.
How Much Power Will It Handle?
Maximum Power is 15 Watts.
What About Weight And Size?
The ZM-2 is a compact 5-1/16″ x 2-5/8″ x 1-5/8″ and weighs only 8 oz. Great for backpacking.