Modifications for the ICOM - RogerK

Date: 18-06-2001 User comment From: Dave KG4KOXSubject: Extra noteI cut one end off the OPC-104 that came with the AT-160 and used the small 13 pin adaptor that came with the 706 MKII. NOWyou must leave pin 6 un-connected or your radio will stay keyed on 2 meters.I did the mod and it works great on HF but I can't get it to tune proper on 6 meters, It will tune to a 1:1 then next time youkey up it will retune again. If anyone knows a way around this please let me know.DaveKG4KOXThis modification is read 711 times.top of page19-07-1998(AT-500) AT-500 Automatic Antenna Tuner ModificationI have been using the icom at-500 automatic antenna tuner for six months, and it is a great piece of gear. however, there is avery 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 areoperating. Many of us utilize one feed line for an 80 and 40 meter dipole or inverted vee. The at-500 (and at-100) has twoseperate antenna terminals for these bands. If you desire to use one feed line for both of these lower band antennas, you eitherhave to install a coax switch and manually switch the tuner in line, or unscrew the pl-259 connector from one antenna terminaland 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. Thisdirects the 80 meter rf to the same terminal as the rf for 40 meters and allows one to use the same antenna terminal for bothbands and one feed line. To perform the change, remove the top cover of the tuner, locate the two correct terminals using page6 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.This modification is read 912 times.top of page