Page 86
FT
DX
9000D O
PERATION
M
ANUAL
SSB/AM M
ODE
T
RANSMISSION
(E
NHANCING
T
RANSMIT
S
IGNAL
Q
UALITY
)
U
SING
THE
S
PEECH
P
ROCESSOR
- SSB, AM M
ODE
-
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 control (#
) for SSB use, as
described on page 80.
2.
Rotate the METER switch (#
) fully to the left,
so as to select “COM” (Compression).
3.
Press the PROC switch (#
) momentarily. The Red
LED imbedded in the switch will light up, 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 control (#
) so that the meter
needle deflects to not more than “10 dB” on the COMP
scale.
To switch the Speech Procesor off, press the PROC
switch once more. The Red LED imbedded in the switch
will go out, confirming that the Speech processor is turned
off.
Advice
Excessive advancement of the COMP control 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.
You may observe the effect of your COMP level ad-
justments by viewing the wave-form on the “Oscillo-
scope” page on the TFT.
The Transmit Monitor is another helpful way of veri-
fying proper adjustment of the Compression level. By
Pressing the MONI switch (#
) and adjusting the
MONI control (#
) for a comfortable listening
level while you are transmitting, you will be able to
hear the difference in sound quality as you make ad-
justments.
The RF PWR control (#
) still controls the RF
power output, whether or not the Speech Processor is
engaged.
METER switch
MIC knob / PROC knob
METER switch
PROC switch
MIC knob / PROC knob
PROC switch
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