RF Technology Eclipse Series Operation And Maintenance Manual page 30

should be removed and an external reference oscillator should be connected via a 50
ohm probe to J4 (just to the right of the DC voltage regulators and converters).
The external reference clock, should have a power level from +5 to +26dBm and any
frequency that meets the following criteria:
500kHz, or any multiple,
any multiple of 128KHz, greater than or equal to 4,
any multiple of 160KHz, greater than or equal to 3,
No User input is required, except to hit the Enter key when the external reference is
connected. The firmware will automatically adjust both reference oscillators, and save
the new DAC adjustments in FLASH (as parameters) to be used to centre the oscillators
each time the unit powers up.
The user should see the following output. (Note that the temperatures, frequencies,
error values, serial number, etc, indicated are examples only)
Connect an external reference input or the clock output
from a GPS receiver to the GPS input.
Enter <RET> when this has been done.
External Reference is 10.0MHz
Ensure that the displayed reference frequency (10.0MHz in the above example) is the
same as the frequency of your oscillator.
Waiting for a GPS clock.
. . . . . .
The system waits here for a GPS reference to be seen. At this stage, this method of
calibrating the clocks has not been validated by RFT Engineering, so do not attempt to
use this option as yet.
Then the firmware continues.
Have not observed a GPS clock
System Frequency relative to external clock is 7372654.32
The crystal temperature is 22C.
Waiting up to 1 minute for clocks to stabilise.
. . . . . .
The crystal temperature is 22 C
The channel ref error = 1 cnts or, 1.63 Hz
The mod ref error = 1 cnts or, 1.63Hz
Page 30
6 FIELD ALIGNMENT PROCEDURE
RF Technology T50