Modifica per accordatore automatico ICOM AT-500

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               automatic antenna tuner modification


I have been using the icom at-500 automatic antenna tuner for six months, and
it is a great piece of gear.  however, there is a very minor modification i
performed to the tuner to better suit my needs.

the tuner automatiacally selects one of four antenna s0-239 connectors on the
back depending upon which band you are operating.  many of us utilize one feed
line for an 80 and 40 meter dipole or inverted vee.  the at-500 (and at-100)
has two seperate antenna terminals for these bands.  if you desire to use one
feed line for both of these lower band antennas, you either have to install a
coax switch and manually switch the tuner in line, or unscrew the pl-259
connector from one antenna terminal a and install it on the other.  all of this
is inconvenient and defeats the purpose of an automatic tuner.  the mod i
performed is extremely simple.  i moved the wire going to antenna terminal #3
and moved it to terminal #2.  this directs the 80 meter rf to the same terminal
as the rf for 40 meters and allows one to use the same antenna terminal for
both bands and one feed line.  to perform the change, remove the top cover of
the tuner, locate the two correct terminals using page 6 of the manual,
unsolder the one to be move, and solder it to the correct terminal. 
the terminals are easy to reach.   just be sure all connections are good.