IC-7600 Antenna Tuner Testing

I did a bit of testing with 2 wire antennas this weekend. Here is a summary of the results, which I also posted to the IC-7600 e-mail reflector:

The antennas:
1 – A “long” 80m Dipole, ladder line, 4:1 balun, then a long coax run
to the rig
2 – A fan dipole with 80/40/20 meter elements (these are close-spaced
elements, with 80m and 40m using opposing legs of a single piece of
300-ohm twinlead), 1:1 balun, then a long coax run to the rig

This was a brief test. I tried only 10/15/20/40/80 meters, and tested
only a few frequencies on each band, including something close to the
bottom and top of each band.

The IC-7600 internal tuner was able to tune both antennas over most of
the 10/15/20/40/80 meter bands with the following exceptions:
1 – Could not match the 80m Long Dipole at the high end of 80m or
anywhere on 40 meters
2 – Could not match the Fan Dipole anywhere on 20 meters

The External LDG-100 PROII was able to match all the test frequencies.
The IC-7600 tuner is very good, and tuned most of the frequencies,
including some that appeared to be worse than 3:1 SWR (the stated
spec) on my antenna analyzer.

Please note – I am NOT knocking the internal tuner, and with a little
antenna work (pruning antennas and feedlines – not fun) I could
probably get matches everywhere I need to operate. So, while the
internal tuner is very good, the LDG (which has a nice ICOM interface)
covers a wider range. The LDG was sometimes very slow (10s of
seconds), but once a match is found it is stored and recalled quickly
next time you need it.


4 thoughts on “IC-7600 Antenna Tuner Testing

Add yours

  1. Hi, How is your LDG tuner connected to the IC7600? Does it respond to the tuner call switch on the radio? I want to use an LDG IC-100 tuner with my new IC7600 for 80meters. I saw some forum posts that said it wont work.

    Tnx & 73

    Kalama, WA

  2. Jeff,

    I use the 4-pin Icom connector. I had to buy the Icom cable for the tuner separately. It connects to the tuner, and provides the standard “AH-4 compatible” interface used on the IC-7600.

  3. Much the same experience here – the 7600’s internal tuner would not match an 80m dipole on 40m (but is FB over all of 80m + WARC bands). The LDG AT-200Pro does just fine on 40m. 73 Joe/AC0DR

  4. I do find that the 7600 tuner is quite fast. It is much faster than my LDG when I first visit a new frequency. Now I am trying to get my antennas within range of the 7600 due to the added convenience. I also set the 7600 to automatically start the tuner if necessary, when I first apply RF. This has greatly increased my speed moving around the Bands in contests.
    73, Tom KG3V

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