Icom AH-4 ATU

[G1EUA]

I have an Icom IC756ProII and not much space to hang an antenna , but \have looked at the specs for the AH-4 ATU and decided to use this device and now have one on order.
Does anyone have any experience of using the IC756ProII with the AH-4 ATU ?
I would be pleased to hear of what performance this gives

Brian Wall G1EUA :

[K2MIT]

Well I used one on an IC-706 MKIIG in a car with an 8-foot whip. It worked great except 40 meters was not so hot. When I went camping, I would hang a 40 foot wire to the bottom of the whip and I would be able to work all over the world and 40 and 80 worked great.

The thing would tune in under 2 seconds. It worked great and held up great. It was mounted under my car and never died in 3 years of daily operation.

The thing is built like a tank and the integration with the "tune" button is nice.

--Jeffrey, K2MIT

[KD7KCP]

I have an IC-718 with a AH4 auto tuner connected to a 30 Ft. copper pipe on top of my 2nd. story roof. The base of the pipe is at 26 Ft. above ground; a ground wire of approximately 32 Ft. is connected to a 10 Ft. ground rod in the ground, making sort of a vertical off center fed dipole. This system works great, I get out very well on 10 meters through 80 meters.

Richard Ziebol KD7KCP

C5641E@msn.com

[G1EUA]

OK well I got the AH-4 and installed it as per the instructions and attached about 20m of wire . I have tried to comapre it to my existing offset wire antenna and so far can not detect any difference on RX or TX.
So my conclusion is that this is a excellent way to get on air if the location is not suitable for a 'normal' antenna as any length of wire over 7 m will cover 80m to 10m
G1EUA

[WA0OFO]

i used a 102" cb whip on the top ladder rack of my rv..put the tuner right below it...it would load 160-6.worked a ton of stations.

[AC0GR]

I just got an AH-4 last week, and set it up at the base of a 30ft vertical. Works great, 80 thru 6. Have not attempted to tune it on 160 yet.

There are a couple points where I think the design is lacking...

First, the supplied control cable, even with the 'small' insert for the compression fitting is still not a tight fit. Had to wrap several layers of electrical tape around the cable to get a 'weather-proof' seal.

Second, why did they not make the RF input a bulkhead connector?
Instead you have to feed coax through the compression fitting -THEN- solder a PL259 to the end of it....

I think I see some minor mechanical modifications in my tuners near future.

[KU5Q]

I have an Icom IC756ProII and not much space to hang an antenna , but \have looked at the specs for the AH-4 ATU and decided to use this device and now have one on order.
Does anyone have any experience of using the IC756ProII with the AH-4 ATU ?
I would be pleased to hear of what performance this gives

Brian Wall G1EUA :

The AH-4 will offer seamless operation with the PROII, and several other Icom radios that are designed to directly interface with it. It will work with almost any HF transceiver with the correct interface. With the appropriate interface circuit I have successfully used it with the Kenwood TS2000, and Yaesu FT950. I have also sucessfully used it with the IC7000, and installed both in a Piper Cheyenne PA31T aircraft. Although there is no documentation to support that it has been certified to appropriate DO160/TSO for use in aircraft, it has proven to me to be dependable for airborne mobile use.

You should find the AH-4 satisfactory for use with your PROII.

W3VR