X-2 Technical Service Manual Introduction 1-5
Publication No: 15-02047
1.6.2 Receiver Specifications
Type
Dual conversion, superheterodyne.
IF Frequencies
45 MHz and 455 kHz.
Sensitivity
0.3(0.4) µV PD -117(-115) dBm for 10 dB
SINAD with > 50 mW audio output.
Input Protection
Will withstand 50 V RF from 50 Ω.
Selectivity
Greater than 70(65) dB at -1 kHz and +4 kHz
reference SCF USB.
Pass Band -6(-8) dB 300 to 2700 Hz
Ripple 2(4) dB pp 500 to 2500 Hz
Desensitisation
10 dB SINAD reduced to 7 dB SINAD.
-1 and +4 kHz (ref SCF) 65(60) dB
±10 kHz 85(80) dB
±50 kHz 100(95) dB
Image Rejection
Better than 90(80) dB.
Spurious Responses
Better than 90(70) dB.
Self Generated Signals > 0.3 µV PD:
3652, 5478, 7304, 9130, 10956, 14608 kHz.
Cross Modulation
A signal 85(80) dB above a signal producing
10 dB SINAD, modulated 30% and removed at
least 20 kHz from the wanted signal will
produce an increase in receiver noise of less than
3 dB.
Blocking
As for desensitisation.
Intermodulation
To produce a third order intermodulation
product equivalent to a wanted signal producing
10 dB SINAD, two unwanted signals greater
than 30 kHz removed from the wanted signal
must have a level greater than 82(80) dB above
the wanted signal. Third order intercept +7(4)
dBm, not affected by AGC.
AGC
Less than 6 dB variation in output for input
variation between 1.5(2.5) µV and 100 mV PD.
Fast attack, slow release.
AF Power and
Distortion
2.5 W into 8 Ω 5% THD
5.0 W into 4 Ω 5% THD
8.0 W into 2 Ω 5% THD.
Clarifier
±50 Hz up to 5 MHz
±10 ppm above 5 MHz
Clarifier is automatically reset to mid-frequency
with channel change.
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