User Manual

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9. Power up SRPT-40A, but leave front panel TRANSMIT/STANDBY switch in the “STANDBY” position. Wait for
SRPT-40A to become locked on frequency.
10. Referring to Table (2) – Forward and Reverse Power Calibration, find the row that lists your model. Follow this
row to the CAL. FREQ. (MHz) column. This number represents the frequency your model is to be calibrated at.
Change the SRPT-40A to this calibrated frequency.
11. Measure the B+ voltage. Adjust the B+ if necessary by referring to Switching Power Supply Adjustment or B+
Adjustment When Using 15-30VDC External Supply. If using a 12-15 volt external supply, adjust its voltage to
13.5 to 14.5 volts. It is recommended that the VOLT METER is monitoring B+ throughout this procedure.
12. On the FRONT PANEL CONTROL & METER board, adjust S1 dip-switches with switch 1, 3, and 4 “OFF” and
switch 2 “ON”.
13. Set the front panel FREQUENCY SELECT pushwheel switches as follows:
DECIMAL 7 (far left digit) = “1”
DECIMAL 6 = “4”
DECIMAL 5 = “0”
DECIMAL 4 = “0”
DECIMAL 3 = “0”
DECIMAL 2 = “0”
DECIMAL 1 (far right digit) = “0”
14. Depress and release the front panel EXECUTE pushbutton switch. This command will disable the front panel
POWER ADJUST pot.
15. Set the front panel FREQUENCY SELECT pushwheel switches as follows:
DECIMAL 7 (far left digit) = “1”
DECIMAL 6 = “2”
DECIMAL 5 = “0”
DECIMAL 4 = “0”
DECIMAL 3 = “0”
DECIMAL 2 = “0”
DECIMAL 1 (far right digit) = “0”
16. Depress and release the front panel EXECUTE pushbutton switch. This command will disable VSWR Foldback.
17. Set the front panel FREQUENCY SELECT pushwheel switches as follows:
DECIMAL 7 (far left digit) = “1”
DECIMAL 6 = “1”
DECIMAL 5 = “0”
DECIMAL 4 = “0”
DECIMAL 3 = “1”
DECIMAL 2 = “0”
DECIMAL 1 (far right digit) = “0”
18. Depress and release the front panel EXECUTE pushbutton switch. The SRPT-40A is now in the Reverse Power
Calibration mode.
19. On the FRONT PANEL CONTROL & METER board, adjust S1 dip-switches with switch 1, 2, and 4 “OFF” and
switch 3 “ON”.
20. Set the front panel FREQUENCY SELECT pushwheel switches as follows:
DECIMAL 7 (far left digit) = “1”
DECIMAL 6 = “any number”
DECIMAL 5 = “any number”
DECIMAL 4 = “any number”
DECIMAL 3 = “any number”
DECIMAL 2 = “any number”
DECIMAL 1 (far right digit) = “any number”
21. Depress and release the front panel EXECUTE pushbutton switch. This command will set the internal power control
pot to maximum and the position of the POWER ADJUST pot is ignored.
22. Put the TRANSMIT/STANDBY switch in the “TRANSMIT” position. The output “reverse” power (as indicated by
the WATT METER) should be close to 0 Watts.