Spectracom 8194B, Инструкция по эксплуатации

Страница: 16 / 136

8194B, 8195B, 8197B Spectracom Corporation
GPS Ageless Master Oscillator Instruction Manual 1-6
Signature Control feature is set via the RS-232
communication port.
Simulcast Offsets:
The 8195B 10MHz outputs can be offset in precise steps to
minimize co-channel interference. The offsets provide steps
of ±3, 5, 7, 9 Hz at VHF-HI transmitter frequencies, and ±0.5,
1.0, 1.5, 2.0 Hz at UHF transmitter frequencies. Offsets are
selected by software commands.
Output Options:
The following options are available for the Spectracom
Ageless Master Oscillator:
Option 03
: Adds internal distribution amplifier that allows the
Master Oscillator to drive Spectracom distribution products.
This option adds a 12 Volt DC offset to the rear panel
Frequency Outputs.
Option 06
: Changes the rear panel Frequency Outputs and
front panel 10 MHz output to 12.8 MHz.
Option 07
: Changes the rear panel Frequency Outputs and
front panel 10 MHz Output to 5.0 MHz.
Option 16
: Changes the third and fourth rear panel
Frequency Outputs from 10MHz to 1PPS.
1.6.3 Ovenized Oscillator Frequency Stability
Oscillator Type: 10 MHz OCXO, SC cut. For Model 8194B and 8195B
Locked Accuracy:
±1 x 10
-11
, 24-hour average when locked to GPS and no
frequency offsets selected.
±1 x 10
-10
, 24-hour average when locked to GPS and
frequency offsets selected (8194B/8195B only).
Unlocked Accuracy: Corrections are applied to the oscillator based on learned
oscillator aging characteristics. Holdover accuracy is <5
microseconds over 5 hours.
Recovery:
During a power failure, the oscillator control value is retained
and the connected standby supply provides power to the
oscillator and GPS receiver. At power-on, the disciplined
oscillator returns to the set frequency plus any incurred
aging. Two hours from holdover to oscillator lock.
Four hours from cold start. Recovery times are reduced with
Option 02 Battery Backup.