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CHPA S
ERIES
5.2 Essential CHPA Operating Procedures
5.2.1
Transmit
The CHPA's purpose is to amplify a microwave signal. This procedure describes how to turn
on, enter Transmit state, and set RF output. Thoroughly read this procedure before proceeding.
Note: Before starting the CHPA for the first time, be sure that initial power-
on and checkout procedures have been performed. See Chapter 4, "Initial
Power-On and Checkout," for instructions.
1. Switch on the Main Power Breaker.
Note: It is recommended that AC power be kept off for at least one minute
before turning back on.
2. Verify the following:
•
No fault message is displayed after the Power-On Self-Test (POST).
•
Heater Time Delay counts down from 3:00 to 0:00 minutes. (The Heater Time Delay
countdown will be greater than three minutes if User Heater Time Delay is greater than
zero seconds. User Heater Time Delay can be used to prevent multiple amplifiers from
entering Transmit simultaneously after a prime power failure, for example. See
Appendix B "Time/Date Set" for more information on User Heater Time Delay setting.)
•
STANDBY is reported on Line 2 of the display, and no faults have been reported.
3. To avoid a high RF output during beam turn on set the attenuator to maximum. To do this:
a. Press the MENU button once. Line 3 should display RF CONTROL.
b. Press the FUNCTION Button until Line 4 displays SET ATTN.
c. Type in 25.0, then press ENTER.
d. Press the Line 3 button to return to the default meter display.
4. Press the TRANSMIT button. Line 2 will first display BEAM ON SEQUENCE for
approximately one second, then will display the RF output power.
5. Apply RF input; do not exceed -10 dBm.
6. Set RF output to the desired level. To do so
a. Press the MENU button once.
b. Enter the desired power level in the units displayed. (To change the units used to report
RF readings and settings, toggle the FUNCTION button until RF DISPLAY appears on
Line 4. Press either arrow key to select the desired RF units. Toggle the FUNCTION
button to return to the SET RF OUT entry on Line 4.)
c. Press ENTER.
d. Press either the Line 3 or Line 4 button to return to the default meter display.
5-2
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