Yaesu FT-847, Руководство по эксплуатации

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67
FT-847 O
PERATING
M
ANUAL
OPERATION
Here is an example of satellite operation setup for a typical “analog” voice satellite, AO-10, operating in “Mode B”
on SSB:
•
Press the [ SAT ] switch to activate the “Satellite”
mode of operation. The “ ” icon will appear on
the LCD.
‚
Press the [ A
u
t
B ] key, if necessary, to set the 144
MHz band on the Main Display and the 430 MHz
band on the Sub Display. For Mode B operation,
your radio’s transmit frequency (the “uplink”) will
be on 435 MHz LSB, while your listening (“down-
link”) frequency band will be 145 MHz USB.
ƒ
Using the keypad, set a starting downlink frequency
(for example, 145.895 MHz) on USB.
„
Refer to an appropriate frequency conversion chart,
and use the keypad to enter the uplink frequency
which corresponds to 145.895 MHz (in this case,
435.110 MHz); this is done by pressing
[
SUB ]
ð
[ ENT ]
ð
(frequency digits)
ð
[
ENT
]
ð
[
SSB
] (to select LSB)
ð
[
SUB
].
…
Press the [ TRACK ( A
u
B )] key; this activates the
“Tracking” feature required for operation on many
satellite transponders. An icon (either “
TCK-REV
”
or “
TCK-NOR
”) will appear on the LCD, indicat-
ing the type of tracking selected (“R
EVERSE
” or
“N
ORMAL
”).
†
For satellite AO-10, “R
EVERSE
” tracking is required
(whereby upward frequency change on the Main
VFO causes downward frequency change on the
Sub VFO). If “
TCK-REV
” does not appear, press
the [ N/R ] key once to change the Tracking mode.
‡
Press and hold in the [
MCK/W
] key momentarily ;
a single “beep” will be heard. The “
M CK
” icon on
the LCD will blink. Now press and hold in the
[
MCK/W
] key for ½ second until a double “beep”
is heard; this will lock the current frequency pair
into “Satellite Memory” register #1.
S
ATELLITE
O
PERATION
ˆ
Now rotate the MAIN VFO Tuning Dial to find a
clear frequency. As you do this, observe that the
Sub Display frequency is changing in the opposite
direction from that of the Main Display.
‰
If the satellite is above the horizon, adjust the posi-
tion of your antennas so as to point them at the
satellite.
Š
When the frequency is clear, press the microphone’s
[
PTT
] switch, and give a short whistle into the mi-
crophone. If you have set the uplink/downlink fre-
quency relationship approximately correctly, you
should hear yourself (after a short delay) coming
back from the satellite. Now rotate the
SUB-TUNE
knob so as to make your voice sound natural as
you speak into the microphone (you may find it
easier to match the tones of your whistling).
You may now tune the satellite sub-band, using the
MAIN VFO Tuning Dial, as though you were operat-
ing on any HF or VHF band. As you tune, the uplink
frequency will automatically be adjusted by the Track-
ing feature. Periodically, you may have to make very
slight adjustments to the uplink frequency, using the
SUB-TUNE
control, as Doppler Shift is of different
magnitude on UHF (the 435 MHz Doppler Shift is
about three times the shift on 145 MHz).
Note : Operation on satellite Mode “K” is not possible
with the FT-847, as both the uplink (21 MHz)
and downlink (29 MHz) frequencies fall on the
“HF” antenna jack.