To: file 430_tx_checklist

From: Jon Hagen

Date: Dec. 22, 2004

Subject: 430 Transmitter Check-out Procedure

The following tests should be done prior to radar runs to verify that the transmitter is in good operating shape. Part 1 tests the high voltage and modulator circuits, which are the most prone to failures Part 2 extends the test to radiating RF, which tests the waveguide equipment and also allows complete transmit/receive rehearsals of the impending experiment.

Part 1 (Can be performed while personnel are on the platform)

1. Note the readings of the VacIon gauges for each klystron.

2. Turn on the transmitter from the console ("PA System On") and wait 15 minutes for the "PA HV READY" light.

3. Put the timing generator on LOCAL, 4msec IPP, 5% duty cycle.

4. Turn off the RF drive using the "RF OFF" push button on the Reflected Power Alarm panel. (Note that the two red LEDs will turn on, indicating that RF drive is off).

5. Turn off the power to the IPA to make doubly sure that no RF will reach the klystrons.

6. Turn off the pulses to the modulator, using the small slide switch next to the modulator voltage meter.

7. Press the "PA RESET" button and then press the "PA HIGH VOLTAGE ON" button.

8. If the high voltage refuses to come on, check the interlock indicator panel and correct the fault (open door, Y switch control knob not set to CRR, etc)

9. When the high voltage is enabled, bring it up slowly (over perhaps 3 minutes) to 90kV.

If the crow bar fires, begin again, but more slowly. Discontinue the test if there are more than

four crow bar firings.

10. Check that the meter readings for the collector currents in each klystron are zero.

11. Look through the window in the door of the high voltage room at the Zener Diode Current meter on the zener tower. The reading should be about 65mA. (Full scale is 100 mA).

12. Lower the high voltage to 60 kV and turn on the pulses to the modulator, using the small slide switch next to the modulator voltage meter. Check that the collector currents are each about ___amps.

13. Now raise the high voltage to 90 kV and check the collector currents are each about ____amps.

14. Use the console oscilloscope to look at the mod anode waveform. ......