Hello Grant VA6GT ,
If you connect an erxternal tuner like the AH-4 or similar preceeding Icom models to the external port of icom rigs like the IC-7000, when you hit the "tune" button it starts a tuning cycle during it the power will automatiuc be reduced to abt 10w RF, not depending from mode and set power level, and when tuning cycle is ended all will be as before. If the antenna can not be tuned, the "TUNER" will remain off, and you do not see it on the front panel .
There are also simulators to be plugged into ICOM rigs connector that simulate an AH-4 to allow the use of the "tune" button with other external tuners.
You may find documentation on this also on Icom manuals and looking on the net for Icom tuner simulators.
The AH-4 is a good external tuner, but care nust be taken to avoid some wire antenna lenghts; this is also well explained in the AH-4 manual; if you do not have it, I suggest to get it, downloading from some manual site.
Hope this helps you Grant;? 73
????????????????????????????????????????????????? Augusto I2JJR / HB9TZA
