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General| Receiver Type | Direct Sampling |
|---|---|
| Modes | SSB, CW, AM, FM, Digital |
| Power Output | 100 W |
| Sample Rate | 122.88 Msps |
| Connectivity | Ethernet, USB |
| ADC Resolution | 16-bit |
| DA converter | 16-bit |
| Antenna Connectors | 2 x SO-239 |
| Type | Software Defined Radio |
| Frequency Range RX | 30 kHz – 54 MHz |
Introduction to the FLEX-6400/FLEX-6600 SDRs, highlighting their technology and capabilities.
Explains the structure and symbols used in the Hardware Reference Manual and its relationship with other guides.
Provides important safety and regulatory notices for operating the radio, including warnings and cautions.
Details what the 2-Year Limited Hardware Warranty covers, including repair or replacement of defective parts.
Lists exclusions from the warranty, such as misuse, unauthorized modifications, or damage from external factors.
Outlines critical safety precautions for operating the radio, including warnings against misuse, electrical hazards, and environmental factors.
Covers copyright information, disclaimers, limitations of liability, and terms of use for the documentation and products.
States the copyright ownership and usage restrictions for the document, managed by FlexRadio Systems.
Provides general specifications for both FLEX-6400 and FLEX-6600 models, including frequency ranges, power, and dimensions.
Details the transmitter specifications, including architecture, DAC, output power, modulation, and emissions.
Lists receiver specifications, covering architecture, spectral units, ADC, dynamic range, and output levels.
Provides step-by-step instructions on how to safely unpack the FLEX-6400/FLEX-6600 radio and its accessories.
Guides the user on how to inspect the radio for any physical damage after unpacking, including checking the radio and accessories.
Instructions on how to report missing items or shipping damage, including contact information and helpful tips.
Lists essential items that are not supplied with the radio but are necessary for its operation, such as antennas and power supplies.
Explains the LED status indicators for the optional GPSDO, detailing its warm-up, locking, and holdover modes.
Details the DC power input requirements, including voltage, current, connector type, and safety warnings.
Explains the internal 30 Amp fuse for power input, its location, and the importance of using the correct rating.
Describes the SO-239 antenna ports, their impedance, and safety precautions related to RF exposure and connections.
Details the PWR SPKR connector for amplified PC speakers, including the type of plug to use and a caution against mono plugs.
Explains the 3.5mm TRS KEY connector for CW operation, how to connect straight keys and paddles, and wiring details.
Describes the balanced audio input for the FLEX-6600, supporting microphone and line level inputs, and pinout details.
Differentiates between microphone and line level inputs, noting bias capabilities and recommended connections for line level.
Defines 'consumer line level' (-10 dBV) for the audio input and how to adjust professional line levels.
Details the HD-15 accessory connector, its type, pin functions (Line In, Line Out), and a warning about VGA monitors.
Explains the use of Pin 1 for consumer level audio input to the transmitter, directing to SmartSDR for configuration.
Describes Pin 2 as a buffered output for the left channel of the powered speakers.
Describes Pin 3 as a buffered output for the right channel of the powered speakers.
Details the use of Pin 4 as a keying input for CW operation, referencing SmartSDR for configuration.
Identifies pins 5, 6, 7, 8, and 10 as being connected to chassis ground.
Explains Pin 9 as a +5VDC output for external equipment, its current limit, and thermal protection.
Describes Pin 11 as a buffered PTT output, similar to RCA connectors TX1, TX2, and TX3.
Details Pin 12 as the data signal for an I2C serial communication channel, used with external equipment.
Explains Pin 13 as a transmitter interlock signal input for external control.
Explains Pin 14 as a Push-To-Talk input, requiring grounding to engage transmit.
Details Pin 15 as the clock signal for an I2C serial communication channel, used with external equipment.
Describes the RCA connector for external Push-To-Talk signals, requiring the center pin to be grounded.
Explains the RCA connector for receiving an interlock signal from external equipment to prevent transmission.
Details the RCA connector for receiving ALC signals from external amplifiers, with voltage limits and a warning.
Describes the RCA connector for remote power-on functionality, activated by shorting to ground.
Explains the SMA connector for connecting the GPS antenna for the optional GPSDO module.
Describes the SMA connector for the 10 MHz reference output from the optional GPSDO for external equipment.
Details the network connection port for the radio, supporting 100 megabit/1 gigabit Ethernet and auto-sensing.
Explains the function of USB 2.0 ports for SmartSDR specific features and warns against unqualified USB devices.
States that external displays are not supported on FLEX-6400 and FLEX-6600 models.
Describes the external reference clock input for synchronizing the radio's master oscillator.
Details the TX relay outputs for keying external equipment like amplifiers, noting they are isolated outputs.
Explains the BNC connector for the second Spectral Capture Unit (SCU-B) as a receive-only input.
Describes the BNC connector for transverter use, noting it's also an auxiliary receive antenna port.
Details the 3.5mm TRS MIC jack for pseudo-balanced microphone input, including bias voltage options.
Describes the BNC connector for transverter use, noting it's also an auxiliary receive antenna port.
Explains the BNC connector for the first Spectral Capture Unit (SCU-A) as a receive-only input.
Details the 3.5mm TRS PHONES connector for headphones, including recommended ratings and a caution.
Explains the thumbscrew for attaching earth ground to the chassis, emphasizing its safety importance.
Covers safety aspects for installation, including ESD and lightning protection, and general station setup.
Provides guidance on optimal radio placement for reliability and ventilation, including clearance requirements.
Discusses environmental factors for operation, advising to avoid extreme temperatures, humidity, and vibration.
Guides users on connecting the radio to a PC, covering Ethernet cabling and network configurations.
Specifies CAT5e/CAT6 UTP cable requirements for Ethernet connection and notes on cable length and shielding.
Explains the simplest connection method using a Link-Local Ethernet connection directly between PC and radio.
Describes the versatile method of connecting via an existing LAN, including DHCP and static IP considerations.
Directs users to other guides for installing and configuring the SmartSDR software, the radio's human interface.
Lists the specifications for the FHM-2 condenser microphone, including element type, impedance, sensitivity, and frequency response.
Provides instructions on connecting the FHM-2 microphone to the radio's MIC and PTT inputs.
Offers best practices for using the FHM-2 microphone, including positioning, 'cross talking', and equalizer settings.
Discusses transmit power levels for transverters and recommendations for modifying or amplifying the signal.
Details RF connection for common IF transverter configuration, linking the transverter's IF port to the radio's XVTR port.
Explains RF connections for split IF transverters, linking TX IF to XVTR and RX IF to RX-A/RX-B ports.
Covers PTT connections for transverters, typically using TX1, TX2, or TX3 outputs to trigger transmit mode.
Mentions the use of sequencers in transverter applications with split RF outputs and their connection to radio outputs.
Discusses the current limitation of one transverter at a time due to radio band data and future FlexRadio plans.
Lists the available audio inputs on the radio for connecting to a PC sound card, including MIC, BAL, and ACC.
Lists the available audio outputs from the radio for connecting to a PC sound card, including PHONES, PWR SPKR, and ACC.
Discusses how the radio's wide bandwidth changes antenna considerations, recommending experimenting with existing antennas.
Details ATU specifications including network type, antenna connection, frequency range, VSWR range, and tune power.
Introduces the GPSDO module and its capability for attaining extremely precise frequency control.
Provides guidance on positioning the GPS antenna for optimal satellite signal acquisition and locking.
Details the GPSDO lock sequence and status indicators, explaining modes like warm-up, locking, and holdover.
Explains frequency calibration using the SmartSDR routine, including temperature stabilization and signal source requirements.
Provides contact information for FlexRadio Systems Headquarters in the USA, including address, phone, fax, email, and support links.
Instructs users outside the USA to contact their local distributors and provides a link to the distributors page.
