INTERFERENCE REDUCTION FROM DSP FILTER
renowned DSP circuitry is led by the ultra-sharp Bandpass
Filter feature, which utilises the combined effects of
independently-adjustable audio HPF (High-Pass-Filter) and
LPF (Low-Pass-Filter) elements to provide very steep skirt
selectivity and reduction of noise. In voice modes, the
LPF may be adjusted to begin cutting off frequencies
between 1500-3000 Hz, while the HPF cutoff frequency may
be adjusted over the range 100 - 1600 Hz. On CW, the DSP
BPF takes the form of an Audio Peaking Filter, with
minimum bandwidths of 400 Hz, 200 Hz, 100 Hz, and even 25
Hz available for EME (Moonbounce) or other
SIGNAL-TO-NOISE RATIO WITH DSP NOISE REDUCTION
|Building on the
success of the FT-1000MP and FT-920 DSP Noise Reduction
systems, Yaesu's engineers expanded their ambitious
project to optimise two parameters in DSP noise reduction
technology-response time and feedback coefficient--to
provide the best DSP-based noise reduction system in the
industry. After thousands of hours of on-the-air
measurements and circuit evaluations, the Yaesu design
team selected a total of 16 noise reduction parameters, so
as to provide the best degree of noise suppression
consistent with low distortion of the desired signal. This
adaptive filter actually "form fits" itself
around the incoming signal, while rejecting random noise.
providing you with the best chance ever of pulling out
those weak ones.
DSP AUTO NOTCH FILTER
one or more interfering beat tomes from the receiver audio
passband, the DSP Auto-Notch Filter provides instantaneous
sensing and notching of these tones. The notch width is
very narrow, yielding minimal distortion of desired voice
COLLINS® Mechanical Filters for SSB and CW!
for their excellent frequency response, thermal stability,
and low phase distortion, Collins Mechanical Filters in
2-5 kHz and 500 Hz (-6 dB) bandwidths are available as
options for the FT-847. The Collins SSB filter provides a
very "flat" passband response which faithfully
reproduces both voice and data signals (such as satellite
PSK). The 500 Hz Collins 500 Hz filter is ideal for CW or
RTTY work, with Wide/Narrow selection available from the
front panel. Combined with the DSP audio filters, the
Collins Mechanical Filter options make the FT-847 an
outstanding performer on SSB, CW, or Data!
Flexible Operating Provisions for the CW Operator!
CW flexibility is as essential
on VHF and UHF as it is on HF, and the FT-847 provides a.wealth
of tools for outstanding CW performance. For EME and other
very-weak-signal work, the DSP bandwidth may be made as
narrow as 25 Hz, with minimum bandwidths of 100 Hz, 200
Hz, or 400 Hz also available. An iambic electronic keyer,
with adjustable weighting, is provided along with
semi-break-in T/R control. Either USB or LSB-side
injection may be used for CW reception, thanks to the CW
REVERSE feature. And the ultra-fine tuning steps (as small
as 1/10th of a Hz!) provide a tuning "feel" as
smooth as that of an analogue VFO!
Excellence for Todays Active Amateur!
Your FT-847's "talk
power" is enhanced by the built-in RF clipping-type
Speech Processor which increases average SSB output by
approximately 6 dB. And the transmitted IF passband
frequency may be adjusted via Menu, to match or enhance
the frequency characteristics of your voice pattern.
Independent USB and LSB alignment Menus are provided; use
the SSB MONITOR feature to make precise adjustments.
Capability for Every Operating Need!
The rear panel of the FT-847
includes convenient interface jacks for Data mode
operating. For AFSK, RTTY, 300 bps Packet, AMTOR, PSK,
HSCW, etc-, the three-pin DATA IN/OUT jack also supports
"PTT" control in addition to AFSK input and
output. For 1200/9600 bps VHF/UHF Packet, the PKT jack
provides optimised input and output data lines, plus PTT
and squelch status lines. The DATA IN/OUT jack's "RX"
connection may also be used for interfacing to weather
satellite, WeatherFax, or other computer based specialised
decoding software, as well as for tape recording of
incoming receiver audio.
MEMORY AND SCANNING FEATURES
than two decades after Yaesu's FT-227R was introduced as
the world's first synthesised transceiver with memory, the
FT-847 fortifies Yaesu's position as the leader in
imaginative, easy-to-use memory and scanning circuitry
includes 78 regular memories, plus upper/lower band
scanning limit memories, a CALL channel, and a HOME
channel on each band. A two-channel Quick Memory Bank (QMB)
allows instant recall of urgent frequencies, and nineteen
special "Satellite Memory', locations with
8-character alpha-numeric labels allow you to note the
satellite name and transponder mode (e-g-"AO-10/B")
the versatile scanning capabilities of the the FT-847 are:
activation either from the microphone or the front panel
of the transceiver. After stopping on a busy channel, the
restart time may be programmed (via the Menu) at 3, 5, or
SEARCH™ sweeping of the Main VFO (FM mode), with
automatic loading of a special bank of 20 memory channels.
Programrnable Memory Scan, using sub-band limits you
program yourself. For example, you might want to program
144.5 - 148 MHz on 2 meters so as to avoid encroachment on
the SSB/CW sub-band at 144-0 ~ 146 MHz
Channel #1 serves as the PRIORITY Channel, which can be
checked for activity every five seconds.
and Tone Signalling Features for Today's FM Operator! The
FT-847 is an outstanding performed for many aspects of FM
Independently-programmable Repeater Shifts for 28, 50,
144, and 430 MHz.
Repeater Shift (ARS) for 144 MHz and 430 MHz.
* FM Wide/Narrow
modes for 29 MHz or crowded VHF/UHF environments.
Encoder/Decoder and 1750Hz Tone Encoder are built in.
Discriminator Center Meter for precise tuning on
Doppler-shifted FM satellite signals.
FT-847 Earth-Station: The All-in-One Solution to Your
was the first manufacturer to produce a self-contained
amateur HF transceiver; the first to produce an FM
transceiver with memory; the first to produce a
full-duplex satellite transceiver; and now Yaesu is the
first to produce an HF/VHF/UHF all-mode transceiver, ideal
for home or field use, with the versatility to cover every
modern operating mode!
Control Antenna System SWR with the FC-20 HF/50 MHz
External Automatic Tuner Option.
Ideal for tuning out minor SWR
variations in your antenna system, the FC-20 will analyse
the impedance present at the "radio" end of your
coax, and adjust the impedance to match the 50 Ohm
requirement for your FT-847. Utilising fixed inductances
and variable capacitors controlled by precision stepper
motors, the FC-20 can accommodate SWRs of up to 3:1 on HF
and up to 2:1 on 50 MHz. The FC-20 also provides 100
memories for tuning data, so you'll be instantly ready to
transmit on your favourite frequencies, and it includes a
convenient Auto-Start feature in case the antenna system
impedance suddenly changes.
Patented ATAS-100 (ACTIVE-TUNING ANTENNA SYSTEM) Provides
HF/VHF/UHF Coverage with Automatic Motorised Tuning!
The FT-847 Earth Station
System can be expanded for mobile use on the
7/14/21/28/50/144/430 MHz bands via the revolutionary
ATAS-100 ACTIVE-TUNING ANTENNA SYSTEM option. On HF and 50
MHz, the ATAS-100 is controlled via DC voltage transmitted
on the coaxial cable, with an internal motor adjusting the
antenna for best SWR by changing the length of its unique
"accordion" tuning section; no
"resonators" or optional "whips" need
touch on the FT-847's TUNER key begins the tuning process,
which is completed in seconds. The ATAS-100 is compatible
with many common mobile mounts, which are available from
your Yaesu dealer. Coaxial cable is not included.
Antenna Connectors for HF, 50 MHz, 144 MHz, and 430 MHz!
Allowing ease of connection
for your antenna systems, the separate antenna connectors
for HF, 50 MHz, 144 MHz, and 430 MHz also facilitate
full-duplex operation by avoiding internal "Duplexers"
which can compromise noise figure. If you are using an HF
through 50 MHz mobile antenna, the Menu System allows you
to switch the 50 MHz RF line to the "HF" antenna
FEATURES FOR ENJOYABLE, EFFICIENT SATELLITE OPERATION!
* You can
label each of the 19 special Satellite Memories with
alpha-numeric "tags" to help you remember the
satellite name and mode.
transmission, you can command the "satellite
meter" function to indicate either power output (PO),
discriminator center status (DISC), or ALC voltage (ALC).
* For data
operation on satellites, the rear-panel DATA IN/OUT and
PKT jacks can accommodate 9600 bps GMSK, 1200 bps PSK, or
1200 bps AX.25 AFSK modes.
NORMAL AND INVERTED VFO TRACKING
introduced on Yaesu's FT-736R, the FT-847's VFO Tracking
feature slaves the two VFOs according to the requirements
of the satellite's transponder, so you can tune across the
downlink sub-band without having to make manual uplink
adjustments, Some satellites, like RS-12, use a
transponder in which the uplink and downlink frequencies
track in the same direction. Other satellites, like AO-10,
FO-20, and FO-29 use "inverted" tracking,
whereby moving your uplink signal higher in frequency
lowers your downlink frequency, The FT-847 is ready for
either situation, and you may also make minor
Doppler-shift frequency corrections either to the transmit
(uplink) or receive (downlink) frequency manually.
LEADING EDGE RECEIVER DESIGN
|Catching DX on
all the amateur bands between 1.8 and 450 MHz requires a
receiver with several basic characteristics: (A) excellent
sensitivity, to pull out weak signals: (B) minimal noise
contributed by the receiver: and (C) the ability of the
receiver to survive in the presence of extremely strong
signals. The FT-847 was specifically design to excel in
all these areas.
On all bands, the fundamental architecture of the receiver
is the same. After input bandpass filtering, a defeatable
RF preamplifier provides front-end gain with very low
noise figure and excellent dynamic range. The RF
preamplifier is followed by a one-chip quad-FET first
mixer, which provides outstanding rejection of
intermodulation. The first receiver IF is at 45.705 MHz,
while the second IF is at 455 kHz, where the main IF
selectivity elements are found.
The receiver front end is the result of hundreds of hours
testing, evaluation, and re-design so as to provide wide
dynamic range in the presence of a large number of strong
signals, not just two tones in a testing lab. Devices to
be used in the front end are individually selected and
matched after extensive testing, so as to ensure
consistent performance in the field. Yaesu, the pioneer in
the development of the HF transceiver, continues that
tradition with the leading-edge receiver performance of
DIGITAL SYNTHESISER PROVIDES ULTRA-LOW NOISE!
noisy PLL circuits of earlier years, the FT-847 utilises a
new-generation ultra-low-noise DDS (Direct Digital
Synthesiser) in its local oscillator design. The DDS
provides very fine tuning steps (down to 0.1 Hz per step!)
for careful tuning of EME signals, seamless Doppler Shift
correction during satellite work, and effortless Digital
mode tuning. Additionally, the ultra-low-noise design of
the DDS does not compromise the wide dynamic range of the
receiver, by ensuring that the local signals are pure,
with noise sidebands well suppressed. The outstanding
Carrier-to-Noise Ratio of the DDS translates into better
Signal-to-Noise ratio for your FT-847's receiver.
Low-Noise Receive Preamplifiers including HEMT Device for
Ensuring best noise figure for
UHF operation, Yaesu's engineers have incorporated a
very-low-noise 10 dB HEMT (High Electron Mobility
Transistor) preamplifier for best sensitivity. Especially
valuable for the 430 MHz DX work, the HEMT preamp
contributes to the FT-847's industry-best sensitivity
specification of 0.125 uV for 10 dB S/N (SSB bandwidth).
If you have tower mounted preamplifiers you with to
utilise instead, the FT-847 can be configured (independently
on 144 and/or 430 MHz) to bypass the internal preamp in
favour of passing +13.8V DC through your coax line to
power your preamplifier.
EXCLUSIVE PUSH-PULL COOLING SYSTEM™!
The FT-847's twin cooling fans
conduct heat away from the critical circuitry of the
transceiver. The front-panel fax provides efficient
ingress of cool air, which is ducted access the control
and amplifier circuits. The rear fan, in turn, forces warm
are out the back panel vents. The extensive thermodynamic
design effort had produced a transceiver which is ready
for challenges of digital mode or contest operation.
* Exciting Receiver
Features Enhance Your Operating Experience!
* EXPANDED RECEIVE
FREQUENCY RANGE 37-76, 108-174, and 420-512 MHz.
So you can check
propagation below 6 meters, monitor the 4-meter band,
download images from weather satellites, or follow the
action on the public safety frequencies!
* IF SHIFT: For adjustment
of IF passband to avoid interference.
* IF NOISE BLANKER: For
reduction of automotive ignition noise.
* INPUT RF ATTENUATOR: For
more comfortable reception of extremely strong signals.
* FIXED-LEVEL AF OUT JACK:
For connection to tape recorder, WeatherFax decoder. etc.
TRANSMITTER DESIGN CONCEPTS!
unique power amplification design represents a major
breakthrough in the amateur radio industry. For 1.8-54
MHz, the FT-847 uses a pair of rugged 2SC5125 bipolar
power transistors in a push-pull configuration. On the 144
MHz band a single 2SC5125 is utilised, and on the 430 MHz
band, a 2SC3102 UHF power transistor is used. Carefully
specified and selected devices are employed in the power
amplifier stages of the ultra-compact transceiver,
producing consistent, reliable power output with low SSB
CONTROL PROVIDES OPERATING ENJOYMENT!
Navigation via SHUTTLE-JOG™ Tuning Ring
First introduced on Yaesu' s
FT-1000MP and FT920, the Shuttle-Jog™ Tuning Ring
provides rapid frequency change by its unique spring
loaded design. Rotating the Shuttle-Jog™ ring slightly
to the left or right begins manual scanning to lower or
high frequencies respectively. Lean the ring further, and
the scanning rate increases. There's no better way to get
"feel" for a band than by using Yaesu's
exclusive Shuttle Jog™!
Sub-VFO Tuning Knob
The Sub-VFO Tuning Knob may be
used in a number of ways. For transceive operation using
the Main VFO, this knob may function as a CLARIFIER
control ("R.l.T.") for minor frequency offsets.
During HF "Split" DX pile-up operation, it may
be used to adjust your transmit VFOs frequency. And during
Satellite operation, it lets you correct your uplink
frequency for Doppler Shift.
Channelised VFO/MEM CH Control Gets You Where You Want to
For those situations where
quick (but precise) tuning of the band is required, the
VFO/MEM CH switch provides "channelised" tuning
via a rotary switch encoder knob. The step sizes may be
changed, via the Menu, independently for the SSB/CW, AM,
and FM modes and independently (on these modes) for the
HF, 50 MHz, 144 MHz, and 430 MHz bands. During Memory
Channel operation, this knob provides selection of your
"SPLIT" Operation for DX-pedition and Pile-up
Besides the Satellite and FM
Repeater modes, the FT-847 includes a "SPLIT"
operating mode for DX operation on the 7 MHz SSB band, or
for DX pile-ups where the difference between the TX and RX
frequencies is beyond the Clarifiers +9.99 kHz range. The
Sub VFO serves as the VFO for transmission, and its
frequency may be adjusted via the SUB-TUNE VFO knob.
High-Contrast Multi-Function Blue Liquid Crystal Display
The large (200 mm x 20 mm)
blue LCD provides high resolution and contrast for easy
viewing over a wide range of angles and light levels.
Dozens of status indicators keep you informed of every
aspect of your FT-847's operational characteristics, with
the large Sub-VFO field on the right side being
particularly helpful during satellite operation. The LCD's
illumination brightness is adjustable via an 8-level
Direct Frequency Entry Keypad!
For quick QSY particular
frequency, the keypad may be used for direct frequency
entry on both the Main and Sub VFOs. The keypad also
provides control functions for repeater, scanning, and
Direct Computer Control Interfacing
Yaesu's CAT System for
Computer Aided Transceiver control is provided via a
rear-panel "DB-9" connector, and it includes a
built-in RS232C level converter. Just hook up your serial
data cable, and you're ready for action! Data may be
transferred at speeds of 4800, 9600, or even 57600 bps!
Voice Frequency Announcement Module (FVS-1A)
For operators with impaired
vision, the FT-847 includes provision for the optional
FVS-1A Voice Synthesiser, which gives you an audible
announcement of the current operating frequency (with
resolution to the nearest 100 Hz step)
FULL DUPLEX OPERATION!
antenna jacks on the rear panel of the FT847, in
conjunction with Yaesu's time-proven crossband full duplex
design know-how, bring you effortless satellite operation
whereby you can monitor your downlink signal from the
satellite while you are transmitting. The FT-847 is ready
for operation on Mode A (TX: 145 MHz, RX: 29 MHz), Mode B
(TX: 435 MHz, RX: 145 MHz), Mode J (TX: 145 MHz, RX: 435
MHz) and Mode T (TX: 21 MHz, RX: 145 MHz). Independent and
display of both uplink and downlink frequencies is