ENHANCING TRANSMIT SIGNAL QUALITY

USING THE SPEECH PROCESSOR (SSB/AM MODES)

The Speech Processor is designed to increase “talk power” by increasing the average power output via a sophisticated compression technique. The result is improved intelligibility when conditions are difficult.

1.Adjust the [MIC] (gain) knob for SSB use, as described on page 64.

2.Rotate the [METER] switch fully to the left, so as to select “COMP” (Compression).

3.Press the [PROC] button momentarily. The “” icon will appear in the display, confirming that the Speech Processor is engaged.

4.Press the PTT switch on the microphone, and speak into the microphone in a normal voice level. Observe the deflection of the meter needle on the COMP meter scale.

5.Rotate the [PROC] knob so that the meter needle de- flects to not more than “10 dB” on the COMP scale.

6.To switch the Speech Processor off, press the [PROC] button once more. The “” icon will turn off, con- firming that the Speech processor is turned off.

ADVICE:

￿Excessive advancement of the [PROC] knob will re- sult in a degradation of the transmitted signal’s signal- to-noise ratio, thereby reducing intelligibility at the other end of the circuit.

￿The Transmit Monitor is very helpful way of verifying proper adjustment of the compression level. Pressing the [MONI] button then adjusting the [MONI] knob for a comfortable listening level while you are trans- mitting, you will be able to hear the difference in sound quality as you make adjustments.

￿The [RF PWR] knob still controls the RF power out- put, whether or not the Speech Processor is engaged.

￿When the optional DMU-2000Data Management Unit is connected, you may observe the effect of your com- pression level adjustments by viewing the wave-form on the “Oscilloscope” page.

[MONI] Button

[PROC] Button

[METER] Switch

[MIC] Knob

[MONI] Knob

[RF PWR] Knob

[PROC] Knob

FT-2000 OPERATING MANUAL

Page 69