GTR 8000 Base Radio
5.1.1 GTR 8000 Base Radio Time and Frequency Inputs
A variety of external time and frequency inputs can be provided to the base station for normal operation or for
Internal Frequency Reference Oscillator alignment. The following table provides a list of acceptable input signal
types and levels for each base radio input port.
Table 5-1
Base Radio Time and Frequency Inputs
Input Port
Frequency
Waveform
Level
Impedance
Note
Ext Freq Ref
5 MHz
Sine
2.6–5.3 Vpp
100 kohms
AC coupled
Ext Freq Ref
5 MHz
Square
45–55% duty cycle
100 kohms
AC coupled
Ext Freq Ref
10 MHz
Sine
2.6–5.3 Vpp
100 kohms
AC coupled
Ext Freq Ref
10 MHz
Square
45-55% duty cycle
100 kohms
AC coupled
Ext Freq Ref
20 MHz
Sine
2.6–5.3 Vpp
100 kohms
AC coupled
Ext Freq Ref
20 MHz
Square
45–55% duty cycle
100 kohms
AC coupled
Ext Freq Ref
5 MHz/1PPS*
Square
2.6–5.3 Vpp
100 kohms
AC coupled; 25%
modulation 1pps
arrives on 75%
duty cycle
1 PPS
1 PPS
Pulse
2.6–5.3 Vpp
100 kohms
DC coupled
Front Panel
Ext Freq Ref
5 MHz
Sine
2–5 Vpp; 10–18 dBm
50 ohms
AC coupled
Front Panel
Ext Freq Ref
5 MHz
Square
45–55% duty cycle
50 ohms
AC coupled
Front Panel
Ext Freq Ref
10 MHz
Sine
2–5 Vpp; 10–18 dBm
50 ohms
AC coupled
Front Panel
Ext Freq Ref
10 MHz
Square
45–55% duty cycle
50 ohms
AC coupled
Front Panel
Ext Freq Ref
5 MHz/1PPS*
Square
2.6–5.3 Vpp
50 ohms
AC coupled; 25%
modulation 1pps
arrives on 75%
duty cycle
* 25% modulation, 1 PPS arrives on 75% duty cycle.
The Front Panel EXT FREQ REF connection is the Frequency Calibrator (BNC connector) on the
transceiver module.
5.2 Equalizing the Battery
Battery Equalization configures the power supply to set the proper charge and capacity for the storage batteries
connected to the base radio. Sites equipped with storage batteries that provide base radio power in case of primary
power failure require the battery cells to be equalized periodically.
5-2
6871022P86-A - November 2012
Summary of Contents for GTR 8000
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