Arbiter Systems 1088A, Operation Manual

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A.4 Antenna System 101
•
Units with S/N of A119 and below: 5 V TTL/CMOS
•
Units with S/N of A120 and above: AC- or DC-Coupled signals with a slew rate of 10 V/ µ
minimum and level of 5 Vpp maximum
•
Uncomitted input for special configurations
User configurable outputs are 5-V CMOS bus drivers with 47-Ohm source impedance and
±
18-mA
drive capability.
A.3.4 Event Inputs
•
These inputs have 100-ns timing resolution and can record up to 200 sequential events, pro-
vided that the events are separated by at least 11 milliseconds. Read the event log later from
either the front panel or RS-232 interface. A command is also provided to clear the event log.
Event data is stored in battery-backed RAM.
•
The Event A and B inputs may also be configured to accept an external 1-PPS signal, and
measure the deviation from 1 PPS/GPS with 100-ns resolution.
A.3.5 Programmable Pulse Output
1. Seconds-per-pulse; repetitive pulse, every 1
−
60,000 seconds
2. Pulse-per-hour: every 0
−
3599 seconds after the hour
3. Pulse per day; at the specified hour, minute, seconds and fractional seconds
4. Single Trigger; output transitions at the specified day, hour, minute, second and fraction
second, and remains at that voltage
5. Slow Code
−
UTC, LCL; transitions for 6 seconds on the day, four seconds on the hour and
two seconds on the minute
6. Pulse Polarity: positive and negative; positive: held low and transitions high, or negative:
held high and transitions low.
A.3.6 Synchronization
•
For a received data message, the leading edge of the start bit may be selected to trigger the
Event A input, providing synchronization with 100-ns resolution.
A.4 Antenna System
The included antenna is directly mounted on a 26-mm pole (1.05-in. OD or 3/4-in. ID pipe), with
either a standard 1-in. – 14 (approximately M25.4 x 1.81) marine-mount thread or a 3/4-in. NPT
pipe thread. Other mounting configurations are available (contact Arbiter Systems).
•
GPS Antenna Assembly, 3/4-in. Pipe Thread Mount, 35 dB gain; Operates on 5 Vdc.
• Optional Antenna Mounting Bracket available to mount on 60-mm (2-in. nominal) pipe (p/n
AS0044600, see Figure 4.2).
•
Pole mount (2 inch, 55-mm max. diameter) using AS0044600 mounting kit.
A.4.1 Antenna Cable
•
15-meter (50-foot) cable included with antenna.
•
Other cable styles and lengths available see Table 4.2.