Alinco DX-801 Manual de instrucciones descargar pdf (Pagina 25)

MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner Instruction Manual

Frequency Counter Calibration

To calibrate the frequency counter, you will need a transmitter, a 50-ohm dummy load, two 50-ohm SO-

239 coax cables, a Phillips screwdriver, and a tuning tool or small flat blade screwdriver.

WARNING: Do not touch anything inside the tuner during operation! Serious, painful RF

burns can result.

WARNING: Never operate the MFJ-925 with its cover removed; dangerous voltages and

currents can be present during operation. Never exceed tuner specifications.

1. Turn off the power to the transmitter and the tuner.

2. Remove the cover from the tuner (10 screws) with a Phillips screwdriver.

3. Connect the 50-ohm dummy load to the ANTENNA connector; connect the transmitter to the

TRANSMITTER connector on the tuner.

4. Turn on the power to the transmitter. Set and lock the frequency to exactly 29.000 MHz.

5. Press and hold only the [ALT] button while turning the power on. Both LEDs will blink until the

button is released.

6. Within four seconds of releasing [ALT], press the [TUNE] button six

times.

7. After releasing [TUNE] for four seconds, the green LED lights up and the Frequency Counter

Calibration is initiated.

8. Key the transmitter to output about 10 watts and adjust trimmer capacitor VC3 (located next to

the big integrated circuit on the front side of the front panel circuit board) until both LEDs are

lighted up. The green LED lights when the calibration is below 29 MHz, the red LED lights

when the calibration is above 29 MHz and both LEDs light up when the calibration equals to 29

MHz.

9. Unkey the transmitter. Turn off the power to the transmitter and the tuner.

10. Secure the cover back onto the tuner.

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Alinco DX-801 Manual de instrucciones Pagina 25