Gtr 8000 Base Radio Time And Frequency Inputs; Table 46: Time And Frequency Inputs - Motorola ASTRO 25 GTR 8000 Manual

5.1.1

GTR 8000 Base Radio Time and Frequency Inputs

Various external time and frequency inputs can be provided to the base radio 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 input port.

Table 46: Time and Frequency Inputs

Input Port Frequency
Ext Freq Ref 5 MHz
Ext Freq Ref 5 MHz
Ext Freq Ref 10 MHz
Ext Freq Ref 10 MHz
Ext Freq Ref 20 MHz
Ext Freq Ref 20 MHz
Ext Freq Ref 5 MHz/
1PPS*
1PPS 1PPS
Front Panel 5 MHz
Ext Freq Ref
Front Panel 5 MHz
Ext Freq Ref
Front Panel 10 MHz
Ext Freq Ref
Front Panel 10 MHz
Ext Freq Ref
Front Panel 5 MHz/
1PPS*
Ext Freq Ref
* 25% modulation, 1PPS arrives on 75% duty cycle.
NOTICE: The Front Panel EXT FREQ REF connection is the Frequency Calibrator (BNC
connector) on the transceiver module.
Waveform Level
Sine 2.6–5.3 Vpp
Square 45–55% duty cy-
cle
Sine 2.6–5.3 Vpp
Square 45-55% duty cy-
cle
Sine 2.6–5.3 Vpp
Square 45–55% duty cy-
cle
Square 2.6–5.3 Vpp
Pulse 2.6–5.3 Vpp
Sine 2–5 Vpp; 10–18
dBm
Square 45–55% duty cy-
cle
Sine 2–5 Vpp; 10–18
dBm
Square 45–55% duty cy-
cle
Square 2.6–5.3 Vpp
Chapter 5: GTR 8000 Base Radio Optimization
Impe-
dance
100k
ohms
100k
ohms
100k
ohms
100k
ohms
100k
ohms
100k
ohms
100k
ohms
100k
ohms
50 ohms
50 ohms
50 ohms
50 ohms
50 ohms
MN003286A01-E
Note
AC coupled
AC coupled
AC coupled
AC coupled
AC coupled
AC coupled
AC coupled;
25% modula-
tion 1pps ar-
rives on 75%
duty cycle
DC coupled
AC coupled
AC coupled
AC coupled
AC coupled
AC coupled;
25% modula-
tion 1pps ar-
rives on 75%
duty cycle
157