Technical data

VHF/AM RADIO FSG 2T
Appendix A
70 FAV_D10048 June 2014
A.4 Receiver Specification
Receiver Type
Single Superhet
IF Frequency
IF 21.4 MHz, high injection
Sensitivity (m = 30% / 1,000 Hz)
≤ 1 µV (≤ -107 dBm / 50 Ω) for 6 dB S+N/N
Selectivity (AGC method)
≤ 6 dB at ± 8 kHz
≥ 60 dB at ± 17 kHz
≥ 70 dB at ± 25 kHz
Squelch Type, manual override
Automatic (FM noise /Carrier override), adjustable on front panel
AGC (m = 30% / 1 kHz)
≤ 6 dB, 1 µV (-107 dBm) to 1 V (+13 dBm / 50 Ω)
AGC Delay (RX), m = 30%/1 kHz
≤ 0.2 sec, 5 mV (-33 dBm) to 5 µV (-93 dBm / 50 Ω)
AGC Recovery after TX
≤ 0.1 sec at 5 µV (-93 dBm / 50 Ω), after TX end
Transfer time RX to TX
≤ 50 msec
Modulation distortion
≤ 10%, 350 … 3,400 Hz (m = 85%)
Audio Frequency Response / AF
Fidelity
≤ 6 dB (+2 dB / -4 dB), 350 ... 3,400 Hz,
≥ -20 dB at 4 kHz, 25 kHz Ch spacing (Climax Offset Operation)
Nominal AF Output (Speaker)
≥ 4 Watt into 4 Ω (at 9 Vdc …16.1 Vdc supply)
Nominal AF Output (Phone)
≥ 50 mW into 300 Ω (at 9 Vdc …16.1 Vdc supply)
AF Noise Level, normal operation
(under environmental conditions)
≥ 35 dB (≥ 25 dB), m = 30% / 1,000 Hz
at 100 µV to 5 mV / -67 dBm to -33 dBm / 50 Ω
AF External Input (OPTION)
ca. 1 Volt into 600 Ω for rated AF output
Receiver Immunity
Spurious Response for ≤ 6 dB
S+N/N (m = 30% / 1 kHz)
≥ 5 mV (-33 dBm / 50 Ω)
a) 108 - 156 MHz (any 25 kHz Test Channel ≤ ± 8 kHz), except
assigned channel and adjacent channels
b) 50 kHz – 1,215 MHz, except 108 - 156 MHz
Cross Modulation
Max. AF output level ≥ 10 dB below nominal AF output level:
a) Wanted signal 10 µV (-87 dBm) to 250 µV (-59 dBm / 50 Ω),
unmodulated at assigned RX channel, plus additional
b) Unwanted signal 5 mV (-33 dBm), m = 30% / 1000 Hz, fre-
quency 100 - 156 MHz (assigned channel ± 2 RX channels)
Intermodulation (FM Immunity)
≤ 6 dB AF Quieting (-5 dBm / 50 Ω, 87.5 - 107.9 MHz), 2 signals
RF Intermodulation
within the VHF Frequency Band
≥ 70 dB, for 6 dB AF Quieting (unmodulated test signals)
Any VHF / AM Ch +1/+2 Ch, -1/-2 Ch, +1/+2 MHz, -1/-2 MHz
Desensitization
≥ 6 dB S+N/N, at wanted signal 10 µV (-87 dBm), at RX
frequency, m = 30% / 1,000 Hz, in the presence of:
Unwanted signal A 5 mV (-33 dBm / 50 Ω), unmodulated, any
frequency 108 ... 156 MHz, except used CH and ± 1 RX CH, or
Unwanted signal B 100 mV (-7 dBm / 50 Ω); minimum 5 mV
(-87 dBm), unmodulated, frequency 50 kHz – 1,215 MHz, except
87.5 MHz ... 156 MHz, or
Unwanted signal C 125 mV (-5 dBm), unmodulated, frequency
87.5 ... 156 MHz
Receiver Spurious Emission
≤ 141 µV / 400 pW / -64 dBm (50 kHz ... 8 GHz)
Channel Selection Time
≤ 0.4 sec, AF level within 3 dB, max. 20 Memory Channels
Receiver Muting, Squelch
(CLIMAX RX Operation)
Simultaneous input of:
a) Wanted Signal A: 5 µV (-93 dBm) +8 kHz (m = 30% /
1,000 Hz), Squelch is open.
b) Unwanted Signal B: More than 12 µV (-85 dBm), m = 30% /
1000 Hz. While this channel frequency is varied slowly from
-8 kHz to +4 kHz, Squelch must remain open.