Yaesu FT-991A Bedienungsanleitung
Yaesu
Amateurfunker
FT-991A
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HF/VHF/UHF All Mode TrAnsceiVer
FT-991
operATing MAnUAl
YAESU MUSEN CO., LTD.
Tennozu Parkside Building
2-5-8 Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-0002 Japan
YAESU USA
6125 Phyllis Drive, Cypress, CA 90630, U.S.A.
YAESU UK
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
About this MAnuAl . . .
The FT-991A is a leading-edge transceiver with a number of new and exciting features, some of which may be unfamil-
iar to you. In order to gain the most enjoyment and operating efciency from your FT-991A, we recommend that you
read this manual in its entirety, and keep it handy for reference as you explore the many capabilities of your new trans-
ceiver.
Before using your FT-991A, be sure to read and follow the instructions in the “Before You Begin” section of this manu-
al.
About TFT Displays
FT-991A utilizes a TFT liquid-crystal display.
• Although TFT liquid-crystal displays are made using very precise technology, they are prone to develop
dead pixels (dark dot) or pixels that are always on (bright dot). Please understand that such phenomena
do not constitute product defects or malfunctions. Rather, this phenomena occurs due to limitations in the
manufacturing technology with respect to TFT liquid-crystal displays.
• Depending on the viewing angle, unevenness in color or brightness may occur. Please note that any uneven-
ness observed is inherent to the construction of TFT liquid crystal displays and therefore does not constitute
a product defect or malfunction.
• If your TFT liquid-crystal display becomes dirty, please use a dry soft cloth or tissue to wipe the display
clean. Use of glass cleaner, household cleaners, organic solvents, alcohol, abrasives, and/or like substance
may damage the TFT liquid-crystal display.
Page 1FT-991 OperaTing Manual
general DescripTiOn
Built-in high-brightness TFT full-color
display with touch-panel functionality
The FT-991A is equipped with a 3.5 inch full-color TFT
display. Functions, including the receiving band, the noise
and signal interference reduction tools are graphically
displayed. Even while performing rigorous operations,
during DX pditions or contests, the operator may instantly
grasp the status of each function.
Equipped with C4FM digital mode
This transceiver C4FM mode provides good error cor-
rection performance, and supports the V/D mode (voice/
data simultaneous transmission mode) which makes the
transceiver suitable for mobile communication, and the
Voice FR mode (voice full rate mode) which allows the
transceiver to transmit high quality digital audio. The AMS
function recognizes the contacting stations transmission
method and automatically switches the transceiver to the
same C4FM digital or analog (FM) communications mode
as the received signal.
GM (Group Monitor) function allows
registering frequently communicating
stations to a memory group. The group
members may then automatically
exchange (send/receive) station location
information.
The transceiver automatically checks the channel fre-
quency for registered member stations that are within com-
municating range. The distance and direction information
of the call sign members of the group may be shown on
the TFT display.
Comes equipped with two types of
roong lters
This transceiver is equipped with two types of roong l-
ters for 3 kHz and 15 kHz bandwidths. These narrow band
lters are especially useful on a very crowded band during
contests, because they can dramatically attenuate powerful
out-of-band signals in the rst IF stage and reduce their
impact in the second stage to further optimizing the excel-
lent dynamic range and IP3 characteristics for processing
signals ranging from faint to powerful.
Two selectable RF ampliers provide the
optimal receiver gain for each low-to high
HF band (see page 46.)
Congure the front end RF circuitry for the precise gain and
performance to suit the conditions of each HF band.Select
the IPO (Intercept Point Optimization) feature to optimize
the proximal multi-signal and mutual modulation character-
istics in order to minimize the effects of powerful broadcast
stations, especially in the low-band so that even the faintest
signals can be received. When higher gain is advantageous,
select the single low noise RF amplier AMP1. In the high
bands, adding AMP2 provides maximum useful gain.
High stability built-in TCXO
The 30.225 MHz standard oscillator provides exceptional
frequency stability. It is temperature compensated and
boasts an enhanced ±0.5 ppm stability from −10°C to
+50°C.
WIDTH feature and continuously variable
bandwidth SHIFT feature. Optimal wide to
narrow bandwidth switching (see pages
49, 50.)
The SHIFT feature, can eliminate interference in one side
of the passband. The WIDTH feature allows the bandwidth
to be narrowed by rotating the WIDTH knob. The moment
weak signals disappear due to interfering signals (includ-
ing pile-ups), you can eliminate the interfering signals and
extract only the desired signal, thanks to the unique DSP
sharp ltering characteristic.
CONTOUR feature is renowned for
effective noise control (see page 48.)
Rather than using the DSP extremely sharp attenuation
characteristics, the CONTOUR circuit provides gentle
shaping of the DSP passband lter and can thus attenuate
or peak bandwidth components in segments. The interfer-
ing signal can be naturally shaped without having part of
the signal suddenly interrupted. The contour function is
very effective in making the desired signal rise out of the
interference.
DNR (Digital Noise Reduction) by DSP
digital processing (see page 54.)
The incorporated digital noise reduction circuit may be
set to the optimal working point by varying the 15 step
parameters according to the noise type.
NOTCH feature that significantly
eliminates unwanted beat signals; and
DNF feature that instantly attenuates
multiple beat signals (see page 54.)
When interfering beat signals are present in the receiver
passband, the IF NOTCH feature can signicantly elimi-
nate a part of the passband and remove the beat signal.
Moreover, the function is equipped with an Automatic
Tracking System DNF (Digital Notch Filter) that can
be engaged by DSP when there are multiple interfering
signals, even when the frequency is changing.
Reliable High-output Final Amplifier
Stage
In the HF/50MHz frequency range, a pair of RD100HHF1
transistors in a push-pull RF amplier arrangement deliv-
ers 100 watts of low-distortion, high-quality transmitter
power. The nal amplier for the 144 MHz/430 MHz
bands uses the high-output RDH70HUF2 device, provid-
ing ample output power of 50 watts.
Produktspezifikationen
| Marke: | Yaesu |
| Kategorie: | Amateurfunker |
| Modell: | FT-991A |
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