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CHPA SERIES
5.2 Essential CHPA Operating Procedures
5.2.1
Transmit
The CHPA's sole purpose is to amplify a microwave signal. This procedure describes how to
turn on the CHPA, place it in Transmit, and set the RF output. Thoroughly read this procedure
before performing it.
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 under "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 power when the beam is turned on, set the attenuator to its
maximum setting. 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.
5-2
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