Just a quick blog today, but I thought I’d talk about my experiences using the Icom AH-4 Antenna Tuner on an Alinco DX-SR8T. Why would I use an Icom AH-4 on an Alinco? Because a friend gave me one! 🙂
It is widely known / reported on the web that Alinco’s Tuner, the EDX-2, is made by Icom and is fairly similar (although reportedly cut down) to the AH-4, and can be used with various Icom radios. As such, I figured it stood to reason that the reverse should be true!
The first barrier, and really, the only barrier, to using the AH-4 with the DX-SR8 is the fact that the Molex Modular connector that comes with the AH-4 is a 4 pin 0.92? Sized connector, whereas the Alinco uses a 5 Pin 0.62″ sized Molex. Unfortunately, the 5 pin is rather rare, and it cost me $15 to obtain two pairs from the US, but that’s life I suppose.
Luckily, once that hurdle is overcome, it really is quite simple. If you take the cover off the Icom AH-4 and look at the control line header, the pin outs are printed on the PCB. It is then simply a matter of wiring up the 5 pin Molex Plug according to the Pinout given in Alinco’s EDX-2 Manual, which I have included below. Even though the Icom is a 4 pin & the Alinco is a 5 pin, it turns out that both only use 4 wires! The control protocol is the same / similar enough in this case.
Click on the image above for a larger / ‘eye friendly’ version 🙂