Ramsey Electronics HR40 Manual de Instruções descarregar pdf (Página 25)

FHT-1 • 25

 7. Adjust L9 and L13 for maximum indication on TP1. No more than a

turn or two is needed. You will have to go back and forth between these

coils as they interact. You should get a reading of at least 50 mV.

 8. Move your meter probe over to TP2 and adjust L5 and L11 for

maximum negative reading. Once again, go back and forth between the

two coils. You should get a reading of at least -90 mV. It is very

important to tune for the best peak as this will ensure proper transmitter

operation.

 9. You should now be able to see RF power at the output antenna

jack, J1. Adjust capacitor C12 for maximum RF power output. Connect

your voltmeter to TP 3 and peak for maximum DC voltage.

 10. Slightly spread or compress coils L3 and L7 to maximize output

power. Power should be at least 4 watts with a 12 volt power source.

 11. Next, power down the unit, remove the jumper from jumper JMP7 to

resistor R14. this will disable the high power mode and enable low power

operation. When power is re-applied to the unit, the transmitter should

be at approximately 1 W RF output.

 12. If a frequency counter or service monitor is available, adjust

capacitor C43 for exactly 146.520 MHz. If you do not have such

equipment, use a receiver with a center tune meter.

 13. Disconnect the power source from unit to continue with assembly.

See Installation and Programming of the Microcontroller on the following

pages.

This completes the transmitter alignment of your FHT-1. Now it is time to

remove the clip lead or jumper connections from jumper JMP7 to JMP4, the

PTT enable.

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Ramsey Electronics HR40 Manual de Instruções Página 25