User's Manual

TB7100 Specifications Manual Receiver Specifications 19
© Tait Electronics Limited May 2005
Receiver Audio Section - Gating Operation
Gating Settings
Country
City
Hard
8 dB
SINAD
12 dB
SINAD
20 dB
SINAD
SINAD Gating
Opening Level
Accuracy
Opening Point SINAD Variation with
Receiver Bandwidth
RF Hysteresis
RF Hysteresis Variation at Extremes
Modulation Desense No Carrier
Offset
Nominal
Variation at Extremes
Modulation Desense with Carrier
Offset (NB 1.5 kHz, MB 2.0 kHz, WB
2.5 kHz)
Nominal
Variation at Extremes
Adjacent Channel Selectivity
Susceptibility to Broadband Noise
Variation at Extremes
EIA-603 Opening Time **
Variation at Extremes
Noise Mute Opening Time***
Variation at Extremes
EIA-603 Closing Time
**EIA times refer to the audio paths
***Noise mute opening times refer to the receiver gate
signal
8 dB to 20 dB
SINAD
± 2 dB (at extremes)
hard 3 dB
SINAD
, city 2 dB
SINAD
, country 2 dB
SINAD
2 dB
RF
(min.)
2 dB
RF
(min.)
70% (min.) full scale deviation
65% (min.) full scale deviation
70% (min.) full scale deviation
65% (min.) full scale deviation
mute operates as in absence of adjacent channel signal
30 dB
RF
(min.)
25 dB
RF
(min.)
60 ms (max.)
75 ms (max.)
20 ms (max.)
25 ms (max.)
must not close
RSSI Gating (RSSI Mute)
Attack Time
Decay Time
Settings
<2.5 ms (from no signal to the country threshold)
<2.5 ms (from –50 dBm to no signal)
country, –115 dBm, city –113 dBm, hard –107 dBm
Receiver Inhibit
High Level Threshold
Low Level Threshold
Internal Bias
Protection
≥2.0 V (Deactivated)
≤0.8 V (Activated)
pull up to 3.3 V via 4.7 kΩ
RC, diode clamps to 3.3 V and ground
Rx Gate Relay Output
Internal Bias
Drive
Peak Load Current
Resistance
Protection
none
opto-isolated, active low Z
± 120 mA
35 Ω max
30 V Zener