FLEX-6400 / 6400M

FlexRadio
FLEX-6400 / 6400M

Specifications

Prices

HF/50 MHz direct sampling transceiver, PC controlled or stand-alone with high resolution touchscreen display and ergonomic controls to deliver a high performance SDR with a traditional radio interface. Two independent receivers, reciprocal mixing dynamic range 116 dB at 2 KHz offset, 100 Watts output power. Ideated in USA, year of introduction 2018.

Reference market : amateur-radio

FLEX-6400 / 6400M specifications

General

Frequency coverage
Receive	0.0300 ~ 54.0000 MHz
Transmit [1]	1.8 / 3.6 / 5.3 / 7.0 / 10 / 14 / 18 / 21 / 24 / 28 / 50 MHz
Mode
CW / LSB / USB / FSK / AM / FM
Tuning step
1 Hz min

Receiver

ADC (Analog to Digital Conversion)
Sample rate	122.88 Msps
Resolution	16 Bit
RF preamplifier
8 / 16 / 24 / 32 dB
RF attenuator
8 dB
RMDR (Reciprocal Mixing Dynamic Range)
110 dB (1 KHz spaced signals) 116 dB (2 KHz spaced signals)
Spurious and image rejection
> 80 dB
Frequency stability
± 0.5ppm ± 0.005ppm/24h with GPS unit [2]

Transmitter

Output power [1]
CW, RTTY, SSB, FM	~1 to 100 W
AM	~1 to 25 W
Spurious emission
Harmonics	< -55 dBc (1.8~29.7 MHz bands) < -65 dBc (50 MHz band)
DAC (Digital to Analog Conversion)
Sample rate	122.88 Msps
Resolution	16 Bit
Carrier suppression (SSB)
< -80 dBc
Unwanted sideband suppression (SSB)
< -80 dBc
Maximum deviation (FM)
± 2.5 / 5 KHz
Audio response
100-2900 Hz default (variable 50Hz to 10kHz)
Microphone
600Ω nominal (200Ω to 10kΩ)
Antenna tuner [3]
Impedance range	16.7 to 150Ω (1.8 MHz band) 8.3 to 300Ω (3.6~29.7 MHz bands) 16.7 to 150Ω (50 MHz band)
Minimum operating power	10W (1.8~29.7 MHz bands) 2W (50 MHz band)

Features

Memory
Unlimited memory channels
Display
1 Hz frequency resolution 8-inch 1920 x 1200 WUXGA touch sensitive LCD
Antenna
2 x SO239 50Ω BNC 50Ω RX only
Power supply
13.8VDC (± 15%)
Power consumption
1.7A, RX typ 23A, TX max power
Audio power
21mW on 16-32Ω headphone 2.6Vpp@10kΩ for external speaker
Audio output
Jack 3.5 mm headphone Jack 3.5 mm external speaker
Connections
USB x 2 LAN (100/1000BaseT Ethernet) HDMI (external display) 25-pin Jack (accessories) Jack 3.5 mm (CW key) RCA (10 MHz reference input) RCA (PTT) RCA (TX Request) RCA (ALC) RCA (Remote On) RCA (TX1) RCA (TX2) RCA (TX3) BNC (XVTR transverter) SMA (GPS antenna input) SMA (10 MHz GPSDO reference output)

Mechanical and environmental data

Operating temperature
from 0°C to +50°C
Dimensions
355 (W) x 178 (H) x 305 (D) mm
Weight
4.8kg

The radio are also capable of very low power (0 dBm typ, +10 dBm max) transmit on transverter port output from 100 KHz to 54 MHz.
The GPSDO option (GPS locked) unit is request.
The ATU is an option.

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FLEX-6400 / 6400M description :

The FLEX-6400 (PC controlled box) and the FLEX-6400M (stand-alone) offers the latest direct sampling SDR technology for the general HF and 50MHz amateur operator yet they offer great performance for chasing DX and contesting. The FLEX6400M transceiver integrates all "6400" capabilities with a stunning 8-inch WUXGA resolution touchscreen display and ergonomic controls to deliver a very high performance software defined radio with a traditional radio interface. It delivers unmatched band awareness from an integrated display while providing an external connection for a HDMI compatible monitor for maximum spectral visibility. Influenced by top contesters and DXers, its independent dual VFO controls are strategically placed to provide maximum productivity for all types of radio operation. It's completely self contained so just plug it in and operate. No computer or network devices are required. With a PC, laptop, or Mac client you can utilize up to 2 x 7 MHz spectrum & waterfall displays and independent receivers to revolutionize your view of the bands. Its two receivers can be placed, simultaneously, on any band and mode.

FLEX-6400 (left) and FLEX-6400M (right) front panel

FLEX-6400 / M back panel

The transmitter offer 100 Watts output power with additional low-power port for transverter operation, allow both reception and transmission on frequencies from VHF and up not available in the base FLEX6400/M. The automatic antenna tuner unit (ATU) is an matching L-network designed to present a 50Ω, low SWR load to the power amplifier (PA) for efficient RF power transfer on non-resonant antenna systems. The FLEX-6600 / M has an integrated ATU as a standard feature whereas the ATU for the FLEX-6400 is a user installable option. FlexRadio's SmartSDR software offers compatibility across the entire "Signature Series" rig family to deliver continuous leveraged software enhancement. You can also use the latest SmartLink technology to access your radio virtually anywhere from any SmartSDR compatible client, even on iPhone, with only a login and password.

FLEX-6400 / 6400M price

We have collected for your convenience the FlexRadio FLEX-6400 / FLEX-6400M 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 2500.00	2021-oct	Brand-new FLEX-6400 version
EUR 2900.00	2021-oct	Brand-new FLEX-6400 version, with ATU
EUR 3690.00	2021-oct	Brand-new FLEX-6400M version, with control console
EUR 4045.00	2021-oct	Brand-new FLEX-6400M version, with control console and ATU
EUR 2400.00	2019-dec	Brand-new FLEX-6400 version
EUR 3400.00	2019-dec	Brand-new FLEX-6400M version, with control console

FLEX-6400 / 6400M review

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