Modifications for the ICOM - RogerK

e shorted to ground and cause PLL unlock.2. It is suggested that the body of the crystal as well as the leads be insulated to prevent contact with L-17 in the VCO circuit.3. Do not trim the leads of the replacement crystal as all of the supplied length is required.This modification is read 552 times.top of page13-01-2002(IC-40) Cloning software for IC-40SAuthor: IcomICF-3 (Icom Cloning Format-3) Cloning software for IC-40SThis modification is read 298 times.top of page23-11-2001(IC-45) IC-45A to IC--45EAuthor: Icom UKThanks to Geoff Boakes (G8PPQ) Icom UK.This is now a VERY OLD radio approx 1980-81 !!, unfortunately we have very little information on this set ( no service manuals ).It would seem that the set uses a xtal mixer PLL, and to get the lower coverage of 430-440 Mhz, you will have to change theCrystals X3 and X4 in the PLL cct.X3 (tx) was 35.74417 Mhz in the 45A, change to 34.912 Mhz (45E)X4 (rx) was 33.9275 Mhz in the 45A, change to 33.095 Mhz (45E).For the 1.6 Mhz repeater shift (if needed) remove diodes D13 and D14..(PLL pcb).To get the display to show 430-440 (rather than 440-450) ADD diodes D15 and D16. (PLL pcb)We CANNOT guarantee that these modifications will work sucessfullyGood luck, I wish you every success.Geoff Boakes (G8PPQ) Icom UK.This modification is read 500 times.top of page01-01-2002(IC-45) Convertinga IC-45A to IC-45EAuthor: Mark - PE3HMP - pe3hmp@hotmail.com.MODIFICATION.NETWell most transceivers can be easily converted from 440-450MHz to 430-44-MHz by cutting some diodes, this is one of thosecases were it can not be done :-)To change the RX/TX freq You will have to replace the two PLL crystals (X3 and X4)RX part