RF Technology R50
Page 19
7.4.4 Fr equency Stability
±
5 ppm over 0 to +60 C, standard
±
12 ppm over -30 to +60 C.
7.4.5 Number of Channels
256, numbered 00 - 255
7.4.6 RF Input Impedance
50 ohms.
7.4.7 IF Fr equencies
1st IF frequency
/- 120kHz
2nd IF frequency
21.4MHZ
3rd IF frequency
455KHz
7.4.8 Sensitivity
-119 dBm for 12dB SINAD
-116 dBm for 20dB Quieting
7.4.9 Selectivity
80dB per RS204C
7.4.10 Spur ious and Image Rejection
90dB
7.4.11 Inter modulation
80dB
7.4.12 Modulation Acceptance BW
7.5KHz
7.4.13 Noise Squelch
(a) Adjustment range:
6-26dB SINAD
(b) Attack time:
20mSec. Above 20dB Quieting
(c) Release Time:
150mSec. At 20dB Quieting decreasing to 20mSec. Above 2uV
preset threshold
(d) HysteresisEqual to approximately 2-3dB noise quieting
7.4.14 Car r ier Level Squelch
Carrier level squelch can be used when it is necessary to set the opening point above
26 dB SINAD as may be required in link applications. The minimum
adjustment range is 0.35uV(-116dBm) to 700 uV(-50dBm).
