![]() ![]() ![]() The main issue is that you must use a mechanical switch to turn it on and off, else you deplete the internal 9V battery within a week. In short, it’s absolutely brilliant at matching antennas quickly and efficiently, but it has a few design shortcomings. I reviewed the mAT-705 on ( click here to read). At time of posting, there are two ATUs in the works that are able to use this port: the Mat-Tuner mAT-705 and the Icom AH-705 (there could be more, but I’m not aware of them). The Icom IC-705 actually has a port on the side of the radio that allows one to connect the rig to an ATU for some level automatic ATU control. Not sure if that would be adequate to trigger the AH-4 to find a match without some sort of command cable connection.įor portable ATUs, let’s take a look: IC-705 Portable ATU Options I’m not quite sure what the “5-15” watts means, but the IC-705’s max output power is 10 watts using an external 12-13.8V battery, and only 5 watts using the BP-272 Li-ion Battery. For that application, I’m sure it’s amazing.Īccording to the AH-4 specifications, it requires “10 W (5–15 W)” of tuning power. That, and I’ve always viewed the AH-4 as more of a remote antenna tuner for those who need a permanent matching box outside the shack near the antenna feed point. ![]() It would not be my first choice as a portable antenna tuner for field work. First off, regarding the Icom AH-4 ATU, I’m not certain if the IC-705 has the same control commands as the AH-4 (I’m guessing it does, but perhaps someone can confirm–?). ![]()
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