Modifications for the ICOM - RogerK

19-07-1998(IC-28) The long, noisy squelch-tail of the Icom IC-28The long, noisy squelch-tail of the Icom IC-28 (A or H model) 2-meter transceiver can be shortened by replacing C110 (4.7 uf)with a smaller value (0.1 to 0.47 uf). (I can't remember the source of this information.)I put a 0.33 uf in my IC-28H; it's a very worthwhile modification.The capacitor is on the bottom board (the one with the lithium battery), just southeast of IC4 as you face the front of the upsidedownradio. The only difficult part is finding the right p-c pads to desolder on the back of the board.To remove the board: Remove bottom plate, unplug speaker. Unplug coaxial antenna connector (gray wire). Other connectorsmay remain in place. Remove 5 mounting screws, one in each corner and one near center. Tilt the board out of the radio. Thebutton in the upper left corner is CPU reset; you may have to reprogram the memories if it is pressed. Remember that, althoughthe radio is off, parts of the circuit are live so be sure not to short any part of the board during the modification.This modification is read 1031 times.top of page05-06-1999(IC-2800) Icom IC-2800h Extended RX ModBefore beginning, I naturally accept NO liability if someone screws up this mod! It is direct from Icom America, and worked wellfor me!After mod Frequency Range:118.0 to 135.995(AM/FM)/ 136.00 to 174.00 MHz320.0 to 399.995(AM/FM)/ 400.00 to 530.00 MHzSteps:1. Remove cover (one bolt on cover).2. Look at the main board. Locate the main processor, under a RF shield.Just to the right of it, among all of the diodes, you should see a vertical jumper marked W13.3. Cut the jumper (do it on top to allow for reconstruction later if you want).4. Reassemble to radio, and try it out!Please email any additional mods for this rig to: tim@k9tim.com.MODIFICATION.NET . Enjoy!!!!Additional info.In some European models RX is not extended even W13 is removed. To Extend VHF and UHF rx do the following trick:Press and hold 4th buttons from top (both, left and right side of the display) while turning the radio on.This modification is read 2749 times.top of page