| Yaesu FT-840 (FT840, FT 840) DIRECT
DIGITAL FREQUENCY SYNTHESIS |
 Two
direct digital synthesisers (DDSS) and a magnetic rotary encoder provide
silent, silky-smooth tuning, pure local signals and very fast transmit/receive
switching. Frequency accuracy and stability are assured by driving both
DDSs from a single master oscillator, and the optional TCXO-4 temperature-compensated
crystal oscillator is available for enhanced ±2-ppm stability from -10
to +50C. |
| Yaesu FT-840 (FT840, FT 840) TWO
AUTOMATIC ANTENNA TUNERS |
| A choice of two automatic
antenna tuners is available for the Yaesu FT-840 (FT840, FT 840) , each with its own microprocessor
and memories which automatically store most recent antenna matching settings
for nearly instant recall while changing operating frequency. The matching
FC-10 can be mounted right next to the transceiver, or the FC-800 can be
installed remotely at the antenna feed point. Each antenna tuner is controlled
from the Yaesu FT-840 (FT840, FT 840) front panel. |
| Yaesu FT-840 (FT840, FT 840) CLEAN
TRANSMITTER OUTPUT |
| The digitally synthesised
local signals ensure clean, low-noise transmitter output: up to 100 watts
on all HF amateur radio bands in CW, SSB and FM* modes, and up to 25 watts
carrier in AM mode.
*FM operation requires optional unit. |
| Yaesu FT-840 (FT840, FT 840) WIDE
RECEIVER DYNAMIC RANGE |
| The receiver tunes all
frequencies between 100 kHz and 30 MHz in 10-Hz steps. For clear weak-signal
work, the low-noise, high-performance receiver front-end feeds an active
FET balanced mixer. A 12-dB attenuator can be inserted in the receiver
front end for clear copy of even very strong signals. |
| FC-10
& FC-800 REMOTE AUTOMATIC ANTENNA TUNER OPTIONS |
 Both
the FC-10 and FC-800 provide all-band transmitting capability with an end-fed
random wire or long whip antenna (the FC-1 0 antenna tuner should be used
with antennas requiring coaxial feed line, such as beams). Both tuners
make use of the control circuitry built into the Yaesu FT-840 (FT840, FT 840) , which allows the
operator to control and monitor automatic operation of the FC-10 or FC-800
mounted near the antenna feed point. The FC-10 provides a compact, easy-to-install
unit that is styled to match the appearance of the Yaesu FT-840 (FT840, FT 840). For more demanding
applications, the FC-800 uses specially selected thermally stable components
and is housed in a waterproof casing to reliably withstand severe climatic
extremes.
 Both
the FC-10 and FC-800 match a wide variety of antennas to within a 1.5:1
SWR on any amateur band frequency in typically less than 30 seconds. Transmitter
power required for matching can be as little as 10 watts, and matching
settings are automatically stored in memory for instant recall when the
same frequency range is reselected later.
|
|
| Yaesu FT-840 (FT840, FT 840) 16-BIT
MAIN CPU |
| The 16-bit main microprocessor
is assisted by four co-processors to provide the simplest possible control
interface for the operator. Two independent (A/B) VFOs for each band (20
total) hold their own frequencies and modes, as well as clarifier offsets
and repeater shifts, when used. One hundred memories store all of this
data for both VFOs, giving a total of 220 independent sets of frequency,
mode and other selections. Of course all memories can be freely tuned and
scanned, but ten special memories also let you limit the tuning/scanning
range between their stored frequencies. External PC control of most functions
by a serial-port-equipped external personal computer is made possible using
the FIF-232C CAT Interface option connected to the CAT jack on the rear
panel. |
| Yaesu FT-840 (FT840, FT 840) QUALITY
CONSTRUCTION |
 The
Yaesu FT-840 (FT840, FT 840) uses a modular die-cast RF power amplifier/heat sink with an internal
thermally switched fan to allow full transmitter output without any rear
panel protrusions to block access to connectors and controls. Modular circuit
design employs surface-mount components on composite epoxy boards for high
efficiency, reliability and serviceability. The Yaesu FT-840 (FT840, FT 840) weighs under 5 kg,
and runs cool all the time. |
| Yaesu FT-840 (FT840, FT 840) IF
SHIFT, REVERSE CW SIDEBAND & EXTRAS |
| Interference rejection
is facilitated by the unique "up-down-up' conversion scheme, and also provides
an adjustable IF shift control to vary the receiver pass-band. Special
features for CW include the reverse CW sideband feature, which prevents
having to re-tune lost signals when switching between LSB and CW modes,
and helps side-step adjacent interference. The adjustable CW pitch (400-Hz-1000-Hz)
lets you match that used by your TNC or multi-mode controller. The optional
YF-112C 500-Hz narrow IF crystal filter can be installed for enhanced CW
narrow skirt selectivity, or the optional YF-112A AM-wide crystal filter
is available for the best reception of shortwave broadcasts. Other valuable
features include an effective noise blanker, all-mode squelch and multi-function
front-panel meter. |
|
|
|
|
Yaesu FT-840 (FT840, FT 840) OPTIONS
|
| FP-800 AC
Power Supply with Loudspeaker
MD-1c8 Desktop Microphone with UP/DOWN/FAST
Tuning Buttons
TCXO-4 Master Reference Oscillator
For special applications and environments
where extra frequency stability is essential, the TCXO-4temperature-compensated
crystal oscillator is a 2-ppm (from -10 to +50,C) replacement for the reference
oscillator.
SP-6 Loudspeaker with Audio Filters
and LL-5 Phone Patch Option
Selectable audio high- and lowpass
filters with a large loudspeaker complement the audio characteristics of
the Yaesu FT-840 (FT840, FT 840) with your choice of 12 different audio filtering combinations.
Two input terminals are provided for multiple transceivers, with a front
panel switch to select between them. A phone jack is provided on the front
panel to take advantage of the audio filters with headphones. With the
optional LL-5 Phone Patch Unit installed in the SP-6, the Yaesu FT-840 (FT840, FT 840) can be
patched to the public telephone network. The LL-5 includes a hybrid transformer
circuit to assure proper impedance matches, and gain controls and level
meter to set proper audio levels on the telephone line. (VOX control not
available).
YH-77ST Lightweight Headphones
Dual samarium-cobalt transducers with
sensitivity of 103 dB/mw (2 dB @ 1 kHz, 35Q) provide the perfect match
for the Yaesu FT-840 (FT840, FT 840), taking full advantage of the spectacular audio performance.
FIF232C CAT System Interface
To control the Yaesu FT-840 (FT840, FT 840) from an RS-232C
serial port of an external personal computer, use the FIF-232C to convert
the TTL levels required by the trans- ceiver to the RS-232C levels required
by the serial port. A cable is included for connection between the transceiver
and the FIF-232C (the cable to the computer must be provided separately).
The FIF-232C includes its own AC power supply.
IF Crystal Filter Options
For extra CW receiver selectivity,
install the 500-Hz YF-112C. Also, for enhanced AM-wide receiver fidelity,
the YF-112A 6-kHz crystal filter may be installed in addition to the standard
2.7 kHz filter (also used for SSB).
FC-10 Matching External Antenna
Tuner
This compact antenna tuner requires
only two plug-in cable connections to the Yaesu FT-840 (FT840, FT 840) , and allows convenient
automatic antenna matching. The FC-10's size and appearance is styled to
match the Yaesu FT-840 (FT840, FT 840) and is an attractive addition to your Yaesu station line-up.
FC-800 External Remote Antenna Tuner
For more demanding applications,the
FC-800 is a weather-resistant automatic antenna matching unit that can
be installed outdoors at the antenna feed-point, or at the antenna whip
for mobile operation.
FM Unit-747
Installing this unit permits narrow-band
FM reception and transmission, as used with 29.0-MHz Amateur 10-meter simplex
and repeater operation.
MMB-20 Mobile Mounting Bracket |
|
| FP-800 |
|
| MD-1c8 |
|
| TCXO-4 |
|
| SP-6 |
|
| IF
Xtal Filter |
|
| FM
Unit-747 |
|
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Yaesu FT-840 (FT840, FT 840) SPECIFICATIONS
|
| Yaesu FT-840 (FT840, FT 840) GENERAL |
|
Frequency Ranges:RX:
|
100 kHz - 30
MHz |
|
TX:
|
160-6 Meter Amateur Bands |
| Frequency
Stability: |
Better than ±10 ppm (or
±5 Hz FM*),(0oC to +40oC) (SSB/CW/AM/AFSK) |
|
from 0- +40oC
and ±2 ppm (or ±300 Hz FM*), |
|
from 0- +50oC
(w/TCXO-4 option) |
| Emission
Modes: |
USB, LSB(J3E), CW (A1A),
AM (A3E), FM* (F3E) |
| Synthesiser
Steps (Min.): |
0.1 Hz (CW/SSB), 10 Hz
(AM/FM) |
| Antenna
Impedance: |
50 Ohm, Unbalanced |
| Operating
Temp. Range: |
-10oC to +50oC
(14oF to 122oF) |
| Power
Requirements: |
DC 13.8V ±10%, Negative
Ground |
| Current
Consumption (approx.): |
1.2 A RX (no signal) |
|
20 A TX (100 watts) |
| Dimensions
(WHD): |
238 x 93 x 243 mm |
|
Weight Approx.:
|
4.5 kg |
| Yaesu FT-840 (FT840, FT 840) TRANSMITTER |
|
RF Power Output:
|
Adjustable
to 100 Watts |
|
25
Watts AM carrier |
|
Modulation Types:
SSB:
|
Balanced,
filtered carrier |
| AM: |
Early
Stage (Low Level) |
| FM: |
Variable
Reactance |
| FM
Maximum Deviation: |
±2.5
kHz |
| Harmonic
Radiation: |
>50
dB below peak output |
|
45
dB (10, 18 MHz) |
| Spurious
Radiation: |
>40
dB below peak output |
| SSB
Carrier Suppression: |
>40
dB below peak output |
| Undesired
Sideband Suppression: |
At
least 50 dB below peak output at 1.5 kHz modulation |
| Audio
Response (SSB): |
not
more than -6 dB from 400-2600 Hz |
| SSB
Frequency Response: |
400
Hz - 2600 Hz (-6 dB) |
| 3rd
order IMD: |
-25
dB @ 100 watts PEP, 14.2 MHz |
| Microphone
Impedance: |
500
- 600 Ohm |
|
|
|
| Yaesu FT-840 (FT840, FT 840) RECEIVER |
|
Circuit Type:
|
dual-conversion
superheterodyne |
|
Intermediate Frequencies:
1st:
|
47.055 MHz |
| 2nd: |
8.215 MHz |
| 3rd: |
455 kHz (FM*) |
| Sensitivity: |
| (for
10dB S/N, 0 dBu-1uV FM* 12 dB SINAD) |
| Frequency ->
Mode (BW) |
150~250
kHz |
250~500
kHz |
0.5~1.8
MHz |
1.8~30
MHz |
| SSB, CW (2.4
kHz) |
< 5 uV |
< 2 uV |
< 1uV |
< 0.25
uV |
| AM (6 kHz) |
< 40 uV |
< 16 uV |
< 8 uV |
< 1 uV |
| FM* (28-30
MHz) (8 kHz) |
- |
- |
- |
< 0.5
uV |
|
| Selectivity:
(-6/-60 dB) ripple 3 dB or better |
| Modes |
Minimum 6
dB BW |
Maximum 60
dB BW |
| CW narrow
(optional) |
500 Hz |
1.8 kHz |
| SSB, CW,
AM narrow |
2.2 kHz |
5.0 kHz |
| AM-Wide (optional) |
6 kHz |
14 kHz (-50
dB) |
| FM* (optional) |
8 kHz |
19 kHz |
|
| Squelch
Sensitivity: |
|
| 1.8
~ 30 MHz (CW, SSB, AM): |
<
2.0 uV |
| 28
~ 30 MHz (FM*): |
<
0.32 uV |
| Image
Rejection (1.8 ~ 30 MHz): |
70
dB or better |
| IF
Rejection (1.8 ~ 30 MHz): |
60
dB or better |
| IF
Shift range: |
±1.2
kHz |
| Clarifier
Tuning Range / Steps: |
±1.25
kHz / 20 Hz |
|
±2.50
kHz / 10 Hz |
| Maximum
Audio Power Output: |
At
least 1.5W into 4 Ohm < 10% THD |
| Audio
Output Impedance: |
4
- 8 Ohm |
|
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