Tait TB9300 - Tx Key Input; 1 PPS Timing Reference Input (BNC)

42 Base Station Specifications TB9300 Specifications Manual
© Tait International Limited August 2022
1.8.9 Tx Key Input
The Tx Key input is not the same as an E-wire input:
Large negative voltages (traditionally associated with E&M signaling)
can damage the reciter hardware if applied directly.
Tait offers an isolation adapter that provides E&M isolated signaling
(order number TBC101A).
Logic state: Active low.
1.8.10 1PPS Timing Reference Input (BNC)
Electrical Characteristics
Parameter Specification Comments
Low voltage level <= +0.8 V Input active
High voltage level >= +2 V Input inactive
Input hysteresis >= 0.4 V
Input resistance >= 10 kΩ To +5 ra il
Maximum external pull up voltage <= 20 V
Input low threshold V
IL
< 0.6 V
Input high threshold V
IH
> 2.3 V
Input termination 470 Ω + 5% (AC terminated)
Transient input voltage |V
IN
| < 15 V
Frequency 1 PPS
Polarity rising edge represents a timing reference
Maximum jitter ±50 ns