User Manual
44
26. Referring again to Table (2) – Forward and Reverse Power Calibration, find the row that lists your model
number. Follow the row to the column FWD PWR LEVELS (W). The corresponding number under DECIMAL 5
= 1 is the next calibrated power. On the SYNTHESIZER, tweak the MAX PWR pot (R74) such that the output
power equals this calibrated power.
27. On the front panel FREQUENCY SELECT pushwheel switches, change only DECIMAL 5 = “1”.
28. Depress and release the front panel EXECUTE pushbutton switch. This command will store the calibrated power
into a software calibration table.
29. Repeat steps (26) thru (28) for the remaining decimals, DECIMAL 5 = “2” thru DECIMAL 5 = “8” using the
corresponding calibrated power numbers under DECIMAL 5 = “#”.
NOTE
THE INTERNAL FORWARD POWER CALIBRATION TABLE IS NOW COMPLETE.
30. On the SYNTHESIZER, tweak the MAX PWR pot (R74) to the desired maximum output power, but do not exceed
50 Watts.
NOTE
AT THIS POINT WE WILL NOW CALIBRATE THE FRONT PANEL METER – FORWARD POWER.
31. Turn the front panel knob to FORWARD POWER.
32. On the FRONT PANEL CONTROL & METER board, tweak the FWD PWR pot (R48) to correlate the front panel
METER (using WATTS scale) to the WATT METER connected to the ANTENNA connector.
33. On the FRONT PANEL CONTROL & METER board, adjust S1 dip-switches with switch 1, 3, and 4 “OFF” and
switch 2 “ON”.
34. Set the front panel FREQUENCY SELECT pushwheel switches as follows:
DECIMAL 7 (far left digit) = “1”
DECIMAL 6 = “0”
DECIMAL 5 = “4”
DECIMAL 4 = “0”
DECIMAL 3 = “0”
DECIMAL 2 = “0”
DECIMAL 1 (far right digit) = “0”
35. Depress and release the front panel EXECUTE pushbutton switch. The SRPT-40A is now out of Forward Power
Calibration mode.
36. 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 = “1”
DECIMAL 2 = “0”
DECIMAL 1 (far right digit) = “0”
37. Depress and release the front panel EXECUTE pushbutton switch. This command will enable VSWR Foldback.
38. 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”