Yaesu FT-2000D, Руководство по эксплуатации

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Page 72 FT-2000D O
PERATING
M
ANUAL
E
NHANCING
T
RANSMIT
S
IGNAL
Q
UALITY
U
SING THE
S
PEECH
P
ROCESSOR
(
SSB/AM/FM M
ODES
)
The FT-2000D ’s Speech Processor is designed to increase “talk power” by increasing the average power output, (via a
sophisticated compression technique) and adjusting the audio quality to the menu settings (“ 134 tAUd PE1 FRQ ,” “ 137
tAUd PE2 FRQ ,” “ 140 tAUd PE3 FRQ ”). The result is improved intelligibility when conditions are difficult.
1. Adjust the [ MIC
] (gain) knob for SSB use, as described
on page 64.
2. Press the [ PROC
] button repeatedly until the “
”
and “ ” icons will appear on the display, indicat-
ing the Speech Processor is engaged.
3. Rotate the [ METER
] switch fully to the left, so as to
select “COM” (Compression). Confirm that the com-
pression level is within the 5 dB to 10 dB range.
It is recommended that you utilize the monitor function
and adjust the [
PROC
] knob between 9:00 to 12:00 o’clock
position.
A
DVICE
:
The Sub band (VFO-B) frequency display will show the
relative compression level of the Speech Processor for 3
seconds whenever the [
PROC
] knob is turned.
You may disable this feature (displaying the relative the
compression level) via Menu item “
015 diSP LVL IND .”
See page 117 for details.
To switch the Speech Processor off, press the [ PROC
]
button once more. The “ ” and “ ” icons will
turn off, confirming that the Speech processor is turned
off.
[PROC] Button
[MIC] Knob
[RF PWR] Knob
[MONI] Button
[METER] Switch
[MONI] Knob
[PROC] Knob
A
DVICE
:
ˆ 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.
ˆ 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.
ˆ The [ RF PWR
] knob still controls the RF power out-
put, whether or not the Speech Processor is engaged.
ˆ You may adjust the Parametric Microphone Equalizer
when the speech processor is engaged, using Menu
items “134” through “142.” See page 70 for details.
ˆ When the optional DMU-2000 Data Management Unit
is connected, you may observe the effect of your com-
pression level adjustments by viewing the wave-form
on the “Oscilloscope” page.