50
4.3.3 CRYSTAL OSCILLATOR (A3A1)
The oscillator is capable of receiving an external input of 5 MHz or 10 MHz. The oscillator
detects the external input frequency. If the external input signal frequency is 10 MHz, the
external signal will be directed to the output. If the external signal frequency is 5 MHz, the
external signal will be frequency doubled, resulting in a 10 MHz signal, which will be directed to
the output.
The oscillator operates as an automatic reference selection switch in a SPDT configuration.
The oscillator switches to the internal 10 MHz oscillator if the external input signal is below a
threshold level of +1 dBm nominal. The internal oscillator is turned off if the unit's output is
switched to the external input signal.
Phase Noise
Option
Part
Number
Temperature
Stability
(0°C to +50°C)
Aging/day
(After 24 hours on
time)
10 Hz
(dBc/Hz)
100 Hz
(dBc/Hz)
1 kHz
(dBc/Hz)
Standard 136284-1
±2 x 10
-8
±5 x 10
-9
-120
-150
-165
10B
136284-2
±5 x 10
-9
1 x 10
-9
-135
-155
-165
10C
136284-3
±2 x 10
-9
1 x 10
-9
-135
-155
-165
Input characteristics -
Frequency:
5 MHz or 10 MHz
Impedance:
50 ohms
Level:
+4 ±3 dBm
Output characteristics -
Frequency:
10 MHz
Impedance:
50 ohms
Level:
+4 ±3 dBm
Status indicator -
Internal oscillator "ON"
TTL Low (0V)
Internal oscillator "OFF"
TTL High (5V)
Mechanical Tuning –
136284-1:
±2 x 10-6 min. 20 turn control
136284-2, 136284-3:
±1 x 10-6 min. 20 turn control
Electrical Tuning:
±1 x 10-7 ±5V input
4.3.4 LOCAL OSCILLATOR (A3A2)
Model Number
Part Number RF LO Frequency (GHz)
DNB-3B
143022-1
9.75, 10.5, 11.25 GHz
DNB-3B-1
143022-5
10.0, 10.75, 11.25 GHz
DNB-2B
143022-4
9.75, 10.75 GHz
Output power:
+13 dBm
Input reference frequency:
10 MHz
Input reference power:
+4 ±3 dBm
Input/Output impedance:
50 ohms
DC voltage:
+5V, +15V
