FT-991A

Specifications    Prices

Compact all mode, all band HF / 50 / 144 / 430 MHz, transceiver with C4FM and real-time color spectrum-scope. Triple conversion with 1st IF roofing-filters of 3 and 15 kHz, IP3 +27dBm @ 14 MHz. 100W on HF+50, antenna tuner included, 50W on 144/430. Ideated in Japan, year of introduction 2016.

Reference market : amateur-radio

FT-991A specifications

General
Frequency coverage
Receive [1]0.0300 ~ 56.0000 MHz
118.0000 ~ 164.0000 MHz
420.0000 ~ 470.0000 MHz
Transmit1.8 / 3.5 / 5.1675 [2] / 5.2 [3] / 7 / 10 / 14 / 18 / 21 / 24 / 28 / 50 / 144 / 430 MHz band
Mode
CW / FSK (RTTY) / PSK / LSB / USB / AM / FM / C4FM
Tuning step
5 / 10 / 100 Hz / 1 KHz
Receiver
Sensitivity
SSB [4]0.158 uV (1.8~30 MHz, 10dB S+N/N, preamp2 ON)
0.125 uV (50~54 MHz, 10dB S+N/N, preamp2 ON)
0.11 uV (144~148 MHz, 10dB S+N/N)
0.11 uV (430~450 MHz, 10dB S+N/N)
AM [5]5 uV (0.5~1.8 MHz, 10dB S+N/N, preamp2 ON)
1.6 uV (1.8~30 MHz, 10dB S+N/N, preamp2 ON)
1.25 uV (50~54 MHz, 10dB S+N/N, preamp2 ON)
FM [6]0.35 uV (28~30 MHz, 12dB SINAD, preamp2 ON)
0.35 uV (50~54 MHz, 12dB SINAD, preamp2 ON)
0.18 uV (144~148 MHz, 12dB SINAD)
0.18 uV (430~450 MHz, 12dB SINAD)
Selectivity
CW / RTTY / PKT> 0.50 KHz (-6dB)
< 0.75 KHz (-60dB)
SSB> 2.4 KHz (-6dB)
< 3.6 KHz (-60dB)
AM> 6.0 KHz (-6dB)
< 15.0 KHz (-60dB)
FM> 12.0 KHz (-6dB)
< 30.0 KHz (-50dB)
RF preamplifiers
Preamp1~10dB
Preamp2~20dB
RF attenuator
12dB
DR (Dynamic Range)
102dB (20 KHz spaced signals, 14 MHz)
100dB (20 KHz spaced signals, 14 MHz, preamp1 ON)
IP3 (3rd order intercept point)
+27dBm (14 MHz)
+14dBm (14 MHz, preamp1 ON)
Image rejection
> 70 dB (1.8~30 MHz, amateur bands)
> 70 dB (50~54 MHz)
> 60 dB (144/430 MHz)
Notch filter
ManualYes
AutomaticYes
NB (Noise Blanker)
10 / 30 / 50dB depth
DNR (Digital Noise Reduction)
Variable in 15 steps
AGC (Automatic Gain Control)
Off, fast, mid, slow
Frequency stability
± 0.5 ppm max with temperature from 0°C to +50°C after 1' warm-up
IF (Intermediate Frequency)
69.450 MHz
9.000 MHz (SSB/CW/AM)
450 kHz (FM/C4FM)
24 KHz (SSB/CW/AM)
IF roofing filter
3 / 15 KHz
Squelch sensitivity
CW / SSB / AM1 uV (1.8~30 MHz, preamp2 ON)
1 uV (50~54 MHz, preamp2 ON)
1 uV (144/430 MHz)
FM0.35 uV (28~30 MHz, preamp2 ON)
0.35 uV (50~54 MHz, preamp2 ON)
0.125 uV (144/430 MHz)
CW features
Auto zero-beating
Semi break-in / full break-in
300~1050 Hz pitch control in 10Hz steps
APF (Audio Peak Filter)
Reverse mode LSB/USB
Transmitter
Output power
SSB / CW / FM5 ~ 100W (HF/50 MHz)
5 ~ 50W (144/430 MHz)
AM2 ~ 25W (HF/50 MHz)
2 ~ 12.5W (144/430 MHz)
Spurious emission
Harmonics< -50 dB (1.8~29.7 MHz)
< -63 dB (50 MHz)
< -60 dB (144/430 MHz)
Carrier suppression (SSB)
> 50 dB
Unwanted sideband suppression (SSB)
> 50 dB
Maximum deviation (FM)
± 5 / 2.5 KHz
Microphone
600Ω (200 to 10kΩ)
CW features
4~60 wpm keyer
Antenna tuner
Impedance range16.7-150Ω (1.8~29.7 MHz)
25-100Ω (50 MHz)
Features
Memory
99 regular memories, up-to 6 groups
9+9 band-edge for scan
3 band-stack memories
5 quick memory bank
Display
10 Hz frequency resolution
75-segments signal meter bar
Selective calling
CTCSS / DCS
Antenna
SO239 50Ω (HF+50 MHz)
SO239 50Ω [7] (144/430 MHz)
Power supply
13.8 VDC ±15%
Power consumption
1.8A RX, audio off
2.2A RX, audio on
23A TX, 100W HF/50 MHz
15A TX, 50W 144/430 MHz
Audio power
2.5 W on 4Ω
Audio output
Jack 3.5 mm headphone
Jack external speaker
Connections
Jack 3.5 mm (key)
Jack (REM / ALC)
6-pin Jack (TNC)
8-pin Jack (antenna tuner)
DB-9 RS232C (PC / GPS)
USB
Mechanical and environmental data
Operating temperature
from -10°C to +50°C
Dimensions
229 (W) x 80 (H) x 253 (D) mm
Weight
4.3kg

  1. 1.8~30, 50~54, 144~148, 430~450 MHz specified performance guaranteed.
  2. Alaska emergency operation.
  3. USA and UK version.
  4. 2.4 kHz bandwidth.
  5. 6 KHz bandwidth.
  6. 15 KHz bandwidth.
  7. N connector for European version.
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FT-991A description :

Roofing Filter for enhanced performance

The Yaesu FT-991A includes a 3KHz and 15KHz roofing filters for the triple conversion receiver that effective attenuates interfering signals and enables outstanding performance while still producing high quality audio.


Yaesu FT-991A receiver block diagram

These narrow band roofing filters are especially useful on a very crowded band during contests, because they can dramatically attenuate powerful out-of-band signals in the first IF stage and reduce their impact in the second stage to further optimizing the excellent dynamic range and IP3 characteristics for processing signals ranging from faint to powerful.

Real-time Spectrum Scope with ASC

The real-time spectrum scope gives radio operators the ability to graphically view the location of signals on the band while they listen to the received audio allowing them to quickly move to the desired signal. The strength of signals on the band can readily be seen on the multi-color waterfall display. Chronological order color differentiation allows operators to easily recognize weak signals at a glance; signals that might otherwise be missed on the spectrum scope.


Yaesu FT-991 real-time Spectrum Scope (left) and multi-color Waterfall Display (right)

Also, the advanced spectrum scope with ASC (Automatic Spectrum-Scope Control) located just below the LCD display gives the operator all the information for comfortable QSO on the DXing scene.

Useful function

Versatile array of functions for CW operation: Advanced electronic keying (4-60 wpm) with FULL BK-IN support, electronic Keyer weight control (2.5-4.5), CW side tone pitch frequency adjustable (300-1050 Hz), message Memory function (5 channel x 50 characters), APF function with 3-stage bandwidth selection improves Signal-to-Noise ratio for enhanced intelligibility, auto Zero-in function facilitates subtle tuning operations for CW, automatic Beacon keyer mode, CW SPOT feature, CW mode reversal. Convenient functions for FM mode: 104 types of DCS (Digital Code Squelch), 50-tone CTCSS encoder/decoder, ARS function provides easy repeater access. Other features: Speech processor, 5-channel digital voice Message memory function for repetitive voice messages, MULTI dial design facilitates setting operations, VOX, MOX, 99 channel memory, RTTY/ DATA Jack, USB port allows connection to a PC with a single cable for CAT control / Audio In-Out interface, Carrying Handle, Tilt Stand.

Solid Performance

The RF Amplifier in the Yaesu FT991 provides a clean and solid 100 Watts of Operating Power (50 Watts on 144/430 MHz) and is combined with a large heat-sink and forced air automatic cooling fan to increase operating time and prevent overheating. Internal high-speed Automatic Antenna Tuner (ATU) included in the package. The antenna tuner uses a LC switching network that has a large capacity 100 channel memory. The tuning data is automatically memorized to reduce tuning time when changing frequency.

FT-991A DSP circuit :

The high speed floating point DSP device TMS320-C6746 (3000 MIPS / 2250 MFLOPS) from Texas Instruments (TI), makes possible excellent interference rejection with actual signals under real-world conditions, not only in the HF but also in the VHF and UHF bands.


Yaesu FT-991 32-bit High Speed Floating Point DSP (left), Contour Filter Conceptual Diagram (top-right), Digital Noise Reduction Perfomance (bottom-right)

The IF-Width and IF-Shift functions are the basis for removing interfering signals and are easily implemented for the best effect. The efficacy of interference rejection is further enhanced by sophisticated functions inherited from the FTDX transceiver series, such as the 16-stage digital noise reduction (DNR) and the auto-notch filter (DNF) that rapidly tracks even multiple heterodynes. The Contour function that enhances the desired signal with a natural sound, and the Notch function with selectable bandwidth, along with other functions are provided for comfortable and convenient DX and QSO operation.

FT-991A receiver circuit :

Features the highly acclaimed quad mixer of the FTDX series transceivers, along with a dedicated VHF/UHF mixer. The 1st IF mixer for HF/50 MHz features a quad mixer with 4 x 3SK294 dual-gate MOSFET devices that assure extremely low noise (NF), excellent intermodulation characteristics (IMD), and high dynamic range (DR). A dedicated VHF/UHF mixer, separate from the HF bands, permits design optimization for targeted frequencies, and results in superior performance characteristics.


Yaesu FT-991 Roofing Filter, HF/50 MHz Quad Mixer, VHF/UHF Mixer

RF amplifier design is optimized for each band. The IPO, AMPI and AMP2 selections for the HF/50 MHz bands allow matching the settings to the current band and conditions, to ensure optimal RF amplifier operation. The RF amplifier for the 430 MHz band uses HEMT (high-electron-mobility transistor) NE3509 devices which maintain good performance into the GHz range, and combine high gain with a low NF.


Yaesu FT-991 Dynamic Range and IP3 characteristics,
14 MHz Band / CW mode / BW=500 Hz / Roofing Filter 3 kHz / 20 kHz Spacing
FT-991A final stage circuit :

Final stage with ample Power reserves; 100 Watt for HF/6m Band and 50 Watt for VHF/UHF Band. Using a push-pull arrangement of RD100HHF1 MOSFET devices, renowned for excellent performance in the HF/6m range, the amplifier delivers 100 W of low-distortion, high-quality power. High speed 1.8 to 54 MHz antenna tuner included as standard equipment. The high speed ATU employs relay switching and features a large 100 channel tuning data memory. This allows the user to instantly call up optimum matching conditions for previously used frequencies.


Yaesu FT-991 VHF/UHF final MOSFET device

50 Watt amplifier for VHF/UHF assures plenty of power for high frequency bands; the final amplifier for the VHF and UHF bands uses the high-output RD70HUF2 MOSFET which incorporates two devices in a single package, providing ample output power of 50 W.

FT-991A parametric equalizer :

The MIC amplifier equalizer feature is equipped with a three-stage parametric equalizer that can alter the Low, Mid, and High frequencies of the audio separately. This feature permits the bandwidth and gain for each part of the audio spectrum to be precisely adjusted independently. You may utilize one group of settings when the speech processor is Off and use an alternate group of settings when the speech processor is On.


Yaesu FT-991 Parametric Equalizer Menu and Parametric Gain

The configuration aspects that may be adjusted on the Parametric Equalizer are Center Frequency (the center frequency of each of the three bands), Gain (the amount of enhancement / suppression), Q (the bandwidth over which the equalization is applied).

FT-991A advanced C4FM functions :

This transceiver C4FM mode provides good error correction perfonnance, and supports the V/D mode (voice/data simultaneous transmission mode) which makes the transceiver suitable for mobile communication, and the Voice FR (full rate) mode which allows the radio 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.

DG-ID (Digital Group ID) / Group Monitor (GM) feature enables automatically locating, and communicating with other stations that have the same number within contact range. The two-digit DG-ID numbers (00...99) can be set separately for Transmit and Receive. By setting both transmit and receive to 00, communication with all the other stations in the C4FM mode is possible, regardless of their number setting.

DP-ID (Digital Personal ID) feature may communicate only by the transceivers registered the individual ID information. Every C4FM transmit communication contains the individual ID information (Radio Identification) of each radio set. The function uses this individual ID information. When the DP-IDs of the transceiver are registered with each other, they can communicate even if the Digital Group ID numbers are different. By registering the DP-ID of the transceiver to the DR-ZX System Fusion 11 digital repeater. the digital repeater may be controlled by remote operation.

FT-991A 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.

FT-991A custom selection button :

This feature lets you select any Menu item for one-touch access via the C.S button.

FT-991A rear panel and connections :


Yaesu FT-991 rear panel and connections

Reference / Description
1GND
Use this terminal to connect the transceiver to a good earth ground, for safety and optimum performance.
2ANT
144/430 MHz, this is the M-type (European version: N-type) coaxial connector.
3RTTY/DATA
This is the input/output jack to connect a terminal unit (TNC) for RTTY and Packet communications.
4TUN/LIN
Connect the optional external antenna tuner PC-40 or the linear amplifier VL-1000.
5GPS/CAT
This is the RS-232C jack for connecting a computer or an external GPS device.
6DC IN
This is the DC power supply connection for the transceiver.
7USB
Connect a computer to control the transceiver remotely using the CAT command.
8EXT SPKR
This is the monaural jack to connect an external speaker.
9REM/ALC
Connect the optional remote control keypad FH-2. When a device such as a linear amplifier is connected, this is an external ALC input jack.
10ANT
HF/50 MHz, this is the M-type coaxial connector.
11Cooling fan.

FT-991A price

We have collected for your convenience the Yaesu FT-991 sale price (Euro) and its trend over time. Useful to guarantee a cheaper purchase of this radio and to put it for sale in the second-hand market. Of course offers, accessories, warranty terms and conditions can lead to different figures.

Price Date Condition
EUR 1399.00 2023-mar Brand-new
EUR 960.00
(1129USD)
2021-feb Brand-new

Store special offer

EUR 1369.00 2021-feb Brand-new
EUR 1431.00
(1229GBP)
2021-jan Brand-new

FT-991A review

VE1AYM14 january 2022

Excellent radio by all means. I wish would have split receivers.

[End post]


Your opinion on merits, defects, experiences, with this radio set is welcome. Write your review, after a technical evaluation by our staff if found suitable will be published on this page. We thank you for your precious contribution.

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