Modifications for the ICOM - RogerK

LIGHT + *LIGHT + 0= PTT enable= PTT Disabled (inhibits the transmitter, good security method)LIGHT + 1 = 1 MHz digit set (4 digit frequency entry)LIGHT + 2 = 10 MHz digit set (5 digit frequency entry)LIGHT + 3 = 100 MHz digit set (6 digit frequency entry)LIGHT + 4 = Scan pause until signal disappearsLIGHT + 5 = Scan pause for 10 secondsLIGHT + 6 = ???? Unknown actionLIGHT + 7 = Power Save deactivated (use this for packet operation)LIGHT + 8 = Power Save (minimum - 0.125 / 0.5 second)LIGHT + 9 = Power Save (maximum - 0.125 / 2.0 seconds)LIGHT + A = ???? Unknown actionLIGHT + B = ???? Unknown actionLIGHT + C = ???? Unknown actionLIGHT + D = ???? Unknown actionLIGHT + # = ???? Unknown actionLIGHT + B + # = RX Extended Range enableThis requires that diode D13 is removed (left diode onCPU board). Note that this diode has already been removedby ICOM at the factory on many units. Be sure to holdthese keys down until the activity display stops and isshowing a receive frequency.FUNC + A= Reset the CPU (this will clear all the memory channels to thefactory defaults)This modification is read 820 times.top of page19-07-1998(IC-24) IC-24AT sensitivityFollowing the frequency expansion modification (as specified by Icom), a sample IC-24 was recently tested for tuning range andinput sensitivity for an S9 signal. While the sensitivity measurements should not be directly compared with the manufacturer'sspecifications (usually measured reference to a signal-to-noise quieting ratio), this "quick and dirty" data should give you a goodidea of the sensitivity to a medium-strength signal.Tuning Range Mode Band Sensitivity for S9 SignalNotes:74 - 107.995 MHz (fm) VHF range approx 1 mV108 - 136 MHz (am) VHF range 10 - 30 µV138 - 240 MHz (fm) VHF range 1 µV - 1 mV (1)250 - 302 MHz (am) VHF range 50 µV - 1 mV (2)310 - 354.995 MHz (fm) VHF range 50 µV - 3 uV (2)355 - 409 MHz (fm) UHF range 3 - 10 µV417 - 490 MHz (fm) UHF range 1 µV - 100 µV (3)805 - 955 MHz (fm) UHF range 10 - 100 µV(1) The sensitivity from 138 - 150 MHz was 1 uV. From 150 - 240, the sensitivity decreased almost linearly from 1 uV to 1 mV(with input voltage plotted logarithmically).(2) The sensitivity increased almost linearly for both these ranges (with input voltage plotted logarithmically).(3) The sensitivity plot looked like a "U" with the bottom of the "U" corresponding to the range 440 - 450 MHz (1 uV). Thesensitivity then got worse below 440 and above 450.(Tests courtesy of WB6GTM)This modification is read 792 times.top of page