home *** CD-ROM | disk | FTP | other *** search
- IC24AT.1
-
- Subject: Re: IC-24AT Receive Mods
-
- 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 you a good idea of the sensitivity to a medium-strength signal.
-
- Tuning Range Mode Band Sensitivity for S9 Signal
-
- 74 - 107.995 MHz (fm) VHF range approx 1 mV
- 108 - 136 MHz (am) VHF range 10 - 30 uV
- 138 - 240 MHz (fm) VHF range 1 uV - 1 mV (1)
- 250 - 302 MHz (am) VHF range 50 uV - 1 mV (2)
- 310 - 354.995 MHz (fm) VHF range 50 uV - 3 uV (2)
-
- 355 - 409 MHz (fm) UHF range 3 - 10 uV
- 417 - 490 MHz (fm) UHF range 1 uV - 100 uV (3)
- 805 - 955 MHz (fm) UHF range 10 - 100 uV
-
- Notes:
-
- (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). The
- sensitivity then got worse below 440 and above 450.
-
- (Tests courtesy of WB6GTM)
-
-
- %
- proceed at your own risk. WA2ISE
- -------------------------------------
-
- continued in file ic24at.2