FDM-DUO SDR Transceiver

DUAL MODE SDR TRANSCEIVER : STAND-ALONE & PC BASED

FDM-DUO is an SDR transceiver that offers the possibility to operate Stand-Alone like traditional radio or connected to a computer discovering the possibilities provided by the SDR technologies.

RX Stand-Alone Specifications

• Frequency range: 10kHz - 54MHz.
• Direct sampling receiver operating @122.88MHz, ADC: LTC2165 16bit.
• DDC (Digital Down Converter) made with FPGA Xilinx Spartan 6.
• Filters & Std-Alone Demodulator made with ARM STM32F4 microcontroller with floating point unit.
• Demodulation: CW, CWR, LSB, USB, AM, FM narrow.
• Selectable LSB and USB filters; 1600Hz to 3100Hz with 100Hz step plus 4000Hz, 5000Hz and 6000Hz values.
• Selectable AM filters from 2500Hz to 6000Hz with 500Hz step.
• Selectable CW filters; 2600Hz, 1500Hz, 1000Hz, 500Hz, 300Hz and 100Hz plus 4 CW peak filters applied after 100Hz filter to obtain an overall filter of 20Hz bandwidth.
• Selectable FM filters: narrow, wide and data.
• Pitch setting: up to 1kHz with 10Hz step.
• RIT feature.
• Three audio volumes: main, auxiliary and sidetone.
• Squelch: off and 10 on levels.
• Gain Control: automatic (AGC) and manual, with settable threshold.
• Noise Reduction: off and 10 on levels.
• Noise Blanker: off and 10 on levels.
• Auto Notch: off and 2 on levels.

TX Stand-Alone Specifications

• Supports bands from 160m to 6m.
• Modulation and filtering made with ARM STM32F4 and DDS AD9957 with 368.64MHz clock.
• Modulation: CW, LSB, USB, AM, FM narrow.
• Microphone input (ADC 48KHz@16bit) with selectable gain (+/-12dB). Tx bandwidth selectable. Compression gain settable.
• Key and Paddle input for CW operation, supports Iambic A and B, settable CW speed for Paddle, settable CW delay.
• Not filtered 0dBm output on SMA connector (can be used as test equipment or as digital RF generator).
• Up to 5W output power on all bands plus Max Selection (e.g. 8W@14MHz).
• PTT Output to drive external amplifiers.

Main Features

• VFO A and VFO B, with dedicated frequency, step and mode.
• 200 MEMORIES with dedicated frequency, step, mode and alphanumeric label.
• QuickMem feature: up to 20 re-callable memories for band selection (memories 180 to 199).
• QuickStep feature: allows to quickly change step without modify VFOs or MEM step.
• Tune feature to facilitate antenna tuning with external antenna tuner.
• VFOA=VFOB feature.
• VFO to MEM and MEM to VFO features.
• Std-Alone Split feature, VFO A for RX and VFO B for TX.
• 2 customizable keys (F4 and F5) with various functions: CW message sending, split management, tuning knob lock, CW/CWR choice.
• 2 frequency entering modes : with step and digit by digit.
• Integrated CW decoder.
• LCD color programmable with RGB values for the various operating modalities (RX, TX , PC remote control, ...).
• All programmable components (ARM RX, ARM TX, Flash for FPGA, User Interface microcontroller and USB controller) are firmware upgradable.
  

General Specifications

• Antenna connectors: RTX SO-239, RX SO-239.
• CAT USB control interface with FTDI controller, manages also RTS and DTR signals to transmit.
• Proprietary EXTIO Interface to connect accessories.
• 10MHz Reference Input on SMA connector.
• Power supply: 2.1mm DC Plug, 13.8VDC.
• RX consumption: typ. 500mA@13.8VDC.
• TX consumption: <2.2A@13.8VDC (5W output).
• Size: Width 180mm (7.00"), Depth 155mm (6.10") including Knob and connectors or 130mm (5.10") only enclosure, Height 70mm (2.75").
• Weight: 1.2Kg (2.4 lb), shipment package 2.2Kg (4.85 lb).

Operation Specifications with FDM-SW2 Software

• Up to 4 simultaneous virtual receivers in single channel mode.
• Up to 8 simultaneous virtual receivers in double channel mode.
• Dedicated Audio Channel for each virtual receiver.
• Dedicated CAT Channel for each virtual receiver.
• Supports connection with external programs using Virtual Serial Ports and Virtual Audio Cables.
• Selectable IQ USB stream in two main modalities:
  • Stand-Alone : 192ksps single channel and 192ksps double channel,
  • Remote : 384ksps, 768ksps, 1536ksps, 3072ksps, 6144ksps in single channel mode and 384ksps in double channel mode.
• Remote Split operation, VFO A for RX and VFO B for TX. TX frequency and TX mode are managed by FDM-SW2.
• Play Files feature. CW messages sending feature. Advanced Transmit Feature with Equalizer, VOX, Compressor, and Filtering functionalities.
• CW Skimmer integration management (DX Spot visualization & tuning capability).
• Direct Digital Modulation using FDM-DUO USB soundcard based on CMedia chipset digitally interfaced with ARM microcontroller.

Go to FDM-DUO files