NGT—Overview and specifications
38
NGT Transceiver System Technical Service Manual
Receiver
Table 2: Receiver specifications
Item
Specification
Type
Dual conversion, superheterodyne
IF frequencies
45 MHz and 455 kHz
Sensitivity
Frequency:
0.25 to 30 MHz
RF amp off:
1.5 [1.25]
µ
V PD
–103 [–105] dBm
Frequency:
1.6 to 30 MHz
RF amp on:
0.2 [0.12]
µ
V PD
–121 [–125] dBm
For 10 dB SINAD with greater than 50 mW audio output
Input protection
Will withstand 50 V p–p RF from a 50 W source
Selectivity
Greater than 65 [70] dB at –1 kHz and +4 kHz reference SCF USB
Pass Band:
–8 [–6] dB
300 to 2800 Hz
Ripple:
4 [2] dB p–p
500 to 2700 Hz
Desensitisation
10 dB SINAD reduced to 7 dB SINAD
−
1 and +4 kHz (ref SCF) 60 [65] dB
±
10 kHz
75 [80] dB
±
50 kHz
90 [95] dB
Blocking
As for Desensitisation
For frequencies >
±
50 kHz > 95 dB
Image rejection
Better than 65 [70] dB
Spurious responses
Better than 70 [90] dB
Self-generated signals > 0.15 mV PD: 4.999, 29.49 MHz
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 90 [92] dB above the
wanted signal
Third order intercept (unaffected by AGC):
+30 [+33] dBm with RF amp off
+10 [+13] dBm with RF amp on
AGC
Less than 6 dB variation in output for input variation between 2.0 [1.0]
µ
V and
100 mV PD (RF amp on)
Fast attack, slow release (selectable release time)
Summary of Contents for NGT 2010 RF
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