Expanded IC24 performance measurements
              ======================================

Following the frequency expansion modification (as specified by Icom), a
sample IC-24 was recently tested for tuning range and input sensitivity for
an S9 signal. While the sensitivity measurements should not be directly
compared with the manufacturer's specifications (usually measured reference
to a signal-to-noise quieting ratio), this "quick and dirty" data should
give a good idea of the sensitivity to a medium-strength signal.

TUNING RANGE     MODE    BAND     SENSITIVITY FOR S9 SIGNAL
74 - 107.995MHz  (FM)  VHF RANGE  APPROX 1mV
108 - 136MHz     (AM)  VHF RANGE  10 - 30uV
138 - 240MHz     (FM)  VHF RANGE  1uV - 1mV (1)
250 - 302MHz     (AM)  VHF RANGE  50uV - 1mV (2)
310 - 354.995MHz (FM)  VHF RANGE  50uV - 3uV (2)
355 - 409MHz     (FM)  UHF RANGE  3 - 10uV
417 - 490MHz     (FM)  UHF RANGE  1uV - 100uV (3)
805 - 955MHz     (FM)  UHF RANGE  10 - 100uV

NOTES:
(1) The sensitivity from 138 - 150MHz was 1uV.  From 150 - 240, the
    sensitivity decreased almost linearly from 1uV to 1mV (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 (1uV). The sensitivity then got
    worse below 440 and above 450.

(tests courtesy of WB6GTM)

(Downloaded from GB7SYP)