5. Tuning and setting Power

Coil Tune Block

TUNE

Be sure power is ON (LED should be lit) Turn Audio Gain all the way down (counter clockwise) Be sure to turn it back up when you are done. There are 3 test hole pads on the unit (see dia- gram). Take a standard voltmeter that is set to DC 5-20 volts and plug it into the bottom and top test hole pads. The black lead will go to the test hole pad closest to the mounting hole (Ground) (Top). Next move the jumper shunt on the “COIL TUNE” jumper block one at a time to find the one that gives the highest meter reading or highest power amp voltage. Be sure that only one jumper is used at a time. Leave this jumper on the highest meter reading and proceed. If you find two areas of the jumper block that give a peak reading one of them may be an harmonic. Chose the position closest to the center of the jumper block range. If you are not seeing a good meter reading then rotate the PWR control until you do, or check your meter.

Now take the tuning tool and ro- tate “TUNE” to obtain a peak reading of the meter. When

the meter peaks you are tuned. Be sure to stay away from the an- tenna while tuning. If you

are to close to the antenna your body will affect where it tunes. Keep in mind that you need to see a peak. The meter should rise and fall as you are turning. If you just turn it clockwise or counter clock- wise all the way and the meter goes up until the capacitor can’t be turned anymore then it is not tuned. Practice if you need to until you get the feel of finding the “peak” voltage. You will get the most power with the least capaci- tance of the tuning cap that you can get to tune (counter clockwise). You may find that 2 jumper positions will tune. If so use the one that

tunes with the “TUNE” in the most counter clockwise or least capacitance position. This will

give you the best range and circuit performance.

Power Adjust

“Green Light” Power LED

Power Switch

Setting the Power is easy, simply turn the PWR control until the LED goes green! See the next page for the manual method using the chart.

Test Hole

(3)

crystal

Audio Gain

12

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Rangemaster AM1000 installation manual Tune