ELAD FDM-DUO SDR Transceivers

ELAD FDM-DUO SDR Transceivers are versatile SDR QRP transceivers with a 5W output that can operate independently without a PC. This compact device incorporates the latest SDR technology, featuring a fast analog-digital converter that directly samples the received HF signals into digital form. A downstream DSP module handles filtering and processing, while an ARM processor manages the control unit signals.

One of the significant features of the FDM-DUO is its ability to function as a standalone unit, making it an ideal companion for QRP enthusiasts, even when traveling. The user-friendly controls include a large VFO knob, two smaller knobs for volume and filter adjustments, and six buttons below a clear LC display for direct access to essential functions. Additional settings are accessible via a menu system.

When connected to a PC, the FDM-DUO transforms into a highly advanced SDR receiver and transmitter, offering capabilities typically found in much larger radios. It covers a frequency range from 9 kHz to 54 MHz and includes a 16-bit ADC with a 122 MHz sampling rate. The device supports various receive modes, including SSB, CW, AM (with Sync-AM), FM, WFM (with Stereo and RDS), RTTY, and DRM. The transmitter provides 5W output power, with an alternative HF output jack offering 0 dBm output.

The FDM-DUO's functionality is significantly enhanced when used with a computer. It features three USB 2.0 interfaces: one for CAT control, another for digital I/Q data for the waterfall display, and a third serving as an external sound card for the PC. This setup facilitates the use of digital modes like RTTY, PSK31 and FT8, simplifying user handling by eliminating the need for additional USB drivers in most cases.

Additionally, the FDM-DUO offers two configurable antenna jacks, allowing for RX/TX on the same jack or separate jacks for RX and TX. This flexibility ensures optimal performance and ease of use for various operating conditions. Available in Black or Red.

Includes:

• ELAD FDM-DUO Transceiver

• 3 × USB A / B cables

• 1 × USB adapter to USB Micro-B

• 2 × audio cables stereo 3.5 mm jack plug on both sides

• 1 × NF extension cable stereo 3.5 mm jack plug / socket

• 1 × DC plug power supply cable, other side open

• 1 × 9 pin D-Sub connector

• 1 × USB stick with FDM-SW2 software, manuals in EN and IT (PDF)

• 1 × hand microphone, electret type, RJ-45 connector, Icom compatible

• 1 × Quick Start Guide

Additional Features and Specifications:

RX Stand-Alone Specifications

• Frequency Range: 9kHz - 54MHz.

• Direct sampling receiver operating at 122.88MHz, ADC: LTC2165 16 bit.

• DDC (Digital Down Converter) built with Xilinx Spartan 6 FPGA.

• Stand-Alone demodulator filters built with STM32F4 ARM microcontroller with FPU.

• Demodulation: CW, CWR, LSB, USB, AM, FM narrow.

• Selectable LSB and USB filters; 1600Hz to 3100Hz in 100Hz increments plus 4000Hz, 5000Hz and 6000Hz values.

• Selectable AM filters range from 2500Hz to 6000Hz with 500Hz steps.

• Selectable CW filters: 2600Hz, 1500Hz, 1000Hz, 500Hz, 300Hz and 100Hz plus 4 CW peak filters applied after the 100Hz filter to give an overall filter bandwidth of 20Hz.

• Selectable FM Filters: narrow, wide and data.

• Pitch setting: up to 1kHz with 10Hz step.

• RIT function.

• Three audio volumes: main, auxiliary and sidetone.

• Squelch: 10 positions can be activated.

• Gain Control: Automatic (AGC) and Manual, with adjustable threshold.

• Noise reduction: 10 levels, selectable.

• Noise Blanker: 10 levels, selectable.

• Automatic notch: 2 types, selectable.

TX Stand-Alone Specifications

• Supports bands from 160m - 6m.

• TX Frequency Range: 1.8-54 MHz

• Modulation and filtering were realized with ARM STM32F4 and DDS AD9957 clocked at 368.64MHz.

• Modulations: CW, LSB, USB, AM, FM narrow.

• Microphone input (ADC 48KHz @ 16bit) with selectable gain (+/- 12dB). Selectable TX bandwidth. Settable compression gain.

• Key and paddle input for CW operation, supports Iambic A and B, CW speed settable for Paddle, CW delay settable.

• Unfiltered 0dBm output on SMA connector (can be used as test equipment or digital RF generator).

• Up to 5W output power on all bands plus maximum selection (e.g. 8W at 14 MHz).

• 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 function: up to 20 recallable memories for band selection (memories 180 to 199).

• QuickStep function: Allows you to quickly change steps without changing the step of the selected VFO or memory.

• Tuning functions for easy antenna tuning with an external antenna tuner.

• Function VFO A = VFO B.

• VFO to MEM (save) and MEM to VFO (load previous save) functions.

• Split Std-Alone function, VFO A for RX and VFO B for TX.

• 2 customizable keys (F4 and F5) with various functions: send CW message, split management, tuning knob lock, CW/CWR selection.

• 2 frequency input modes: step by step or digit by digit.

• Built-in CW decoder.

• Programmable color LCD with RGB values for the various operating modes (RX, TX, PC remote control, etc.).

• All programmable components (ARM RX, ARM TX, Flash for FPGA, user interface microcontroller and USB controller) are upgradable.

Operational specifications with FDM-SW2 software

• Up to 4 simultaneous virtual receivers in single channel mode.

• Up to 8 simultaneous virtual receivers in dual 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.

• USB IQ streaming is selectable in two main modes:

  • Stand-alone: 192ksps single channel and 192ksps double channel

  • Remote : 384ksps, 768ksps, 1536ksps, 3072ksps, 6144ksps in single channel mode and 384ksps in dual channel mode.

• Remote Split operation, VFO A for RX and VFO B for TX. TX frequency and TX mode are managed by FDM-SW2.

• File Play Function. CW Message Send Function. Advanced Transmit Function with EQ, VOX, Compressor and Filter Function.

• CW Skimmer integration management (DX Spot display and adjustment capabilities).

• Direct digital modulation via FDM-DUO USB sound card based on CMedia chipset digitally interfaced with ARM microcontroller.

General Specifications

• Antenna Connectors: RX-TX SO-239, RX SO-239.

• CAT USB control interface with FTDI controller, also handles RTS and DTR signals to transmit.

• Proprietary EXTIO interface for connecting accessories.

• 10MHz reference input on SMA connector.

• Power Supply: 2.1mm jack, voltage 13.8 VDC.

• RX Consumption: Typical 500mA@13.8VDC.

• TX Consumption : <2.2A@13.8VDC (5W output).

• Dimensions: (WxDxH) 7.090 x 6.102 x 2.760 in. (180 x 155 x 70mm)

• Weight: 2.65 lbs. (1.2kg)