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A22
A22
IO
MHz
Frequency
Standard
The 10 MHz Frequency Standard provides a stable frequency reference signal for the 100 MHz
Reference Loop to phase lock to. The 100 MHz Reference Loop
(A7Al
Reference Phase
Detector and A7A2 100 MHz VCXO)
in turn provides stable frequency reference signals
of 10 MHz, 20 MHz, and 100 MHz to lock the remaining phased locked loops-A7 M/N
Reference, A10
20/30
Synthesizer, and A6A9 Phase Lock.
Alternately, the rear-panel FREQ REFERENCE jumper cable can be removed and
an external 5 Mhz or 10 MHz reference signal can be connected to the EXTERNAL
FREQUENCY REFERENCE INPUT. The performance of the spectrum analyzer will be
degraded unless the frequency reference phase noise and spurious signals are less than -140
dBc single sideband (1 Hz) referred to 10 MHz at a 100 Hz to 10 kHz offset.
The
A22Al
Regulator Board assembly provides
+12
V regulated voltage to the A22A2 Quartz
Crystal Oscillator. Voltage Regulator IC,
Ul,
provides
+12
V resolution with Cl and C3
providing compensation and CR1 providing reverse-bias protection.
The A22A2
Q
uartz
Crystal Oscillator is an extremely stable, compact, low-power source of
10 MHz. It has a very fast warm-up time, exhibits excellent temperature characteristics, and
has low phase noise and power consumption.
The A22A2 Quartz Crystal Oscillator has the ability to be adjusted over a range of 20 Hz
(2 x 10w6), yet the control is sensitive enough to allow adjustment to better than 0.1 Hz
(1 x
10-8).
A22
10
MHz
Frequency
Standard
Replacement
Note
.I
rp
For location of hardware and cables referred to in this procedure, see Figure 1.
1. Remove ac line cords and RF Section bottom cover.
2. Remove All YTO Loop by removing three screws as indicated by instructions on top of
YTO Loop assembly. Disconnect cable connector
0.
3. Release A22 10 MHz Standard by removing two screws
0.
4. When removing 10 MHz Standard, disconnect 87 (gray/violet) cable and 6-pin connector
from behind.
A22 1