Yaesu FT-847 handleiding
Handleiding
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37
FT-847 OPERATING MANUAL
OPERATION
RF GAIN CONTROL
The RF GAIN control provides a
manual way to control the gain of the
receiver’s RF and IF amplifier stages.
For most operation, this control
should be left in the fully clockwise
position, which provides maximum gain and best sen-
sitivity. However, under particularly noisy conditions,
net Signal-to-Noise Ratio may be improved by rotat-
ing the RF (GAIN) control counter-clockwise so that
the S-Meter reading holds a steady position slightly
higher than the (variable) S-Meter reading of the noise
itself. Signals weaker than this fixed S-Meter reading
may still be plainly audible, but they will no longer be
affecting the AGC system.
By doing this, you have
•
eliminated annoying noise
which does not contribute to effective reception, and
‚
created a new threshold for the onset of AGC ac-
tion, perhaps allowing even more effective action by
the DSP’s NOISE REDUCTION, NOTCH, and/or the HIGH
CUT/LOW CUT features (see pages 38, 40, 41).
When the noisy conditions have subsided, return the
RF (GAIN) control to its fully clockwise position.
IF NOISE BLANKER
For reduction of impulse noise, such as that produced
by automotive ignition systems, the NOISE BLANKER fea-
ture may prove helpful. To activate the IF NOISE
BLANKER:
•
Turn the Noise Blanker on by press-
ing the [NB] switch. The “
NB
” icon
will appear on the display, and you
should observe a reduction in the
ignition noise.
‚
To turn the Noise Blanker off, press
the [NB] switch again; the “
NB
”
icon will disappear from the display.
Note that the IF NOISE BLANKER may, under crowded
band conditions with extremely strong signals, cause
a slight degradation in overload immunity, or it may
create the sound usually associated with “splatter” on
a nearby signal (if that station is very strong). Try
switching off the NOISE BLANKER if you observe these
conditions.
RECEIVER FEATURES
CLARIFIER
(
R
ECEIVER
I
NCREMENTAL
T
UNING
)
The CLARIFIER provides a means of separating the re-
ceiver and transmitter frequencies by up to ±9.99 kHz.
This may be required for a number of situations:
l If the station you are receiving should start to drift,
the CLARIFIER allows you to follow the drifting sig-
nal without requiring you to move your transmit
frequency.
l In DX pile-up situations, the CLARIFIER offset capa-
bility may be sufficient to cover many “Split” call-
ing situations.
l For VHF/UHF EME (“Moonbounce”) work, the
CLARIFIER allows you to set up a frequency differ-
ence corresponding to the predicted Doppler Shift
for the EME path. See “Appendix” beginning on
page 98 for more details regarding EME operation.
To utilize the CLARIFIER feature:
•
Press the [CLAR] switch; the
“
CLAR
” icon will appear on the
display.
‚
Rotate the SUB-TUNE control to
set the desired frequency offset for
the receiver relative to the transmit
frequency.
ƒ
To switch the CLARIFIER off, press the [CLAR]
switch once more.
Note: If you switch the CLARIFIER Off and do not touch
the MAIN VFO Tuning Dial, the contents of the
CLARIFIER’s register will be preserved. However,
if you change frequencies via the MAIN VFO
tuning Dial after turning the CLARIFIER Off, the
CLARIFIER’s register will be “cleared” to a zero
offset.
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Productinformatie
| Merk | Yaesu |
| Model | FT-847 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 17150 MB |
