{"id":676,"date":"2026-10-22T16:59:47","date_gmt":"2026-10-22T14:59:47","guid":{"rendered":"https:\/\/www.eladit.com\/prodotti\/fdm-duo\/"},"modified":"2026-10-26T17:51:08","modified_gmt":"2026-10-26T16:51:08","slug":"fdm-duo","status":"publish","type":"elad_product","link":"https:\/\/www.eladit.com\/en\/products\/sdr\/sdr-radio\/fdm-duo\/","title":{"rendered":"SDR transceiver FDM-DUO"},"content":{"rendered":"<h3>Dual-mode SDR transceiver: stand-alone and PC-based<\/h3>\n<p>FDM-DUO is an SDR transceiver that can operate stand-alone like a traditional radio or connected to a computer, unlocking the possibilities offered by SDR technologies.<\/p>\n<h3>Stand-alone RX specifications<\/h3>\n<ul>\n<li>Frequency range: 10 kHz &#8211; 54 MHz.<\/li>\n<li>Direct-sampling receiver operating at 122.88 MHz, ADC: LTC2165 16 bit.<\/li>\n<li>DDC (Digital Down Converter) implemented with Xilinx Spartan 6 FPGA.<\/li>\n<li>Stand-alone demodulator filters implemented with ARM STM32F4 microcontroller with FPU.<\/li>\n<li>Demodulation: CW, CWR, LSB, USB, AM, narrow FM.<\/li>\n<li>Selectable LSB and USB filters: from 1600 Hz to 3100 Hz in 100 Hz increments plus values of 4000 Hz, 5000 Hz and 6000 Hz.<\/li>\n<li>Selectable AM filters from 2500 Hz to 6000 Hz in 500 Hz steps.<\/li>\n<li>Selectable CW filters: 2600 Hz, 1500 Hz, 1000 Hz, 500 Hz, 300 Hz and 100 Hz plus 4 CW peak filters applied after the 100 Hz filter to obtain an overall filter bandwidth of 20 Hz.<\/li>\n<li>Selectable FM filters: narrow, wide and data.<\/li>\n<li>Pitch setting: up to 1 kHz in 10 Hz steps.<\/li>\n<li>RIT function.<\/li>\n<li>Three audio volumes: main, auxiliary and sidetone.<\/li>\n<li>Squelch: 10 selectable positions.<\/li>\n<li>Gain control: automatic (AGC) and manual, with adjustable threshold.<\/li>\n<li>Noise reduction: 10 selectable positions.<\/li>\n<li>Noise blanker: 10 selectable positions.<\/li>\n<li>Automatic notch: 2 selectable positions.<\/li>\n<\/ul>\n<h3>Stand-alone TX specifications<\/h3>\n<ul>\n<li>Supports bands from 160 m to 6 m.<\/li>\n<li>Modulation and filtering implemented with ARM STM32F4 and DDS AD9957 with 368.64 MHz clock.<\/li>\n<li>Modulations: CW, LSB, USB, AM, narrow FM.<\/li>\n<li>Microphone input (ADC 48 kHz @ 16 bit) with selectable gain (+\/- 12 dB). Selectable TX bandwidth. Adjustable compression gain.<\/li>\n<li>Key and paddle input for CW operation, supports Iambic A and B, adjustable CW speed for paddle, adjustable CW delay.<\/li>\n<li>Unfiltered 0 dBm output on SMA connector (can be used as test equipment or as a digital RF generator).<\/li>\n<li>Up to 5 W output power on all bands plus maximum selection (for example 8 W at 14 MHz).<\/li>\n<li>PTT output for driving external amplifiers.<\/li>\n<\/ul>\n<h3>Main features<\/h3>\n<ul>\n<li>VFO A and VFO B, with dedicated frequency, step and mode.<\/li>\n<li>200 memories with dedicated frequency, step, mode and alphanumeric label.<\/li>\n<li>QuickMem function: up to 20 recallable memories for band selection (memories 180 to 199).<\/li>\n<li>QuickStep function: allows the step to be changed quickly without modifying the step of the VFO or of the selected memory.<\/li>\n<li>Tune function to facilitate antenna tuning with the external antenna tuner.<\/li>\n<li>VFO A = VFO B function.<\/li>\n<li>VFO to MEM (save) and MEM to VFO (load previous save) functions.<\/li>\n<li>Stand-alone split function, VFO A for RX and VFO B for TX.<\/li>\n<li>2 customizable keys (F4 and F5) with various functions: CW message sending, split management, tuning knob lock, CW\/CWR selection.<\/li>\n<li>2 frequency entry modes: by step or digit by digit.<\/li>\n<li>Built-in CW decoder.<\/li>\n<li>Color LCD programmable with RGB values for the various operating modes (RX, TX, PC remote control, &#8230;).<\/li>\n<li>All programmable components (ARM RX, ARM TX, FPGA Flash, user interface microcontroller and USB controller) are upgradable.<\/li>\n<\/ul>\n<h3>General specifications<\/h3>\n<ul>\n<li>Antenna connectors: RTX SO-239, RX SO-239.<\/li>\n<li>USB CAT control interface with FTDI controller, also handles RTS and DTR signals for transmitting.<\/li>\n<li>Proprietary EXTIO interface for connecting accessories.<\/li>\n<li>10 MHz reference input on SMA connector.<\/li>\n<li>Power supply: 2.1 mm jack, voltage 13.8 Vdc.<\/li>\n<li>RX consumption: typical 500 mA @ 13.8 Vdc.<\/li>\n<li>TX consumption: &lt;2.2 A @ 13.8 Vdc (5 W output).<\/li>\n<li>Dimensions: width 180 mm, depth 155 mm including knob and connectors (enclosure only 130 mm), height 70 mm.<\/li>\n<li>Weight: 1.2 kg, shipping package 2.2 kg.<\/li>\n<\/ul>\n<h3>Operating specifications with the FDM-SW2 software<\/h3>\n<ul>\n<li>Up to 4 simultaneous virtual receivers in single-channel mode.<\/li>\n<li>Up to 8 simultaneous virtual receivers in dual-channel mode.<\/li>\n<li>Dedicated audio channel for each virtual receiver.<\/li>\n<li>Dedicated CAT channel for each virtual receiver.<\/li>\n<li>Supports connection with external programs using virtual serial ports and virtual audio cables.<\/li>\n<li>USB IQ streaming selectable in two main modes: stand-alone, 192 ksps single channel and 192 ksps double channel; remote, 384 ksps, 768 ksps, 1536 ksps, 3072 ksps, 6144 ksps in single-channel mode and 384 ksps in dual-channel mode.<\/li>\n<li>Remote split operation, VFO A for RX and VFO B for TX. TX frequency and TX mode are managed by FDM-SW2.<\/li>\n<li>File playback function. CW message sending function. Advanced transmit function with equalization, VOX, compressor and filter capabilities.<\/li>\n<li>CW Skimmer integration management (DX spot display and tuning capability).<\/li>\n<li>Direct digital modulation via the FDM-DUO USB sound card based on a CMedia chipset digitally interfaced with an ARM microcontroller.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.eladit.com\/en\/download\/sdr\/fdm-duo\/\">Go to the FDM-DUO files<\/a><\/p>\n<p><a href=\"http:\/\/support.eladit.com\/kb\/faq.php?id=84&amp;lang=en\">Go to the preselector compatibility table<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dual-mode SDR transceiver: stand-alone and PC-based FDM-DUO is an SDR transceiver that can operate stand-alone like a traditional radio or connected to a computer, unlocking the possibilities offered by SDR technologies. Stand-alone RX specifications Frequency range: 10 kHz &#8211; 54 MHz. Direct-sampling receiver operating at 122.88 MHz, ADC: LTC2165 16 bit. DDC (Digital Down Converter) [&hellip;]<\/p>\n","protected":false},"featured_media":0,"menu_order":1,"template":"","elad_product_cat":[72],"class_list":["post-676","elad_product","type-elad_product","status-publish","hentry","elad_product_cat-sdr-radio"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.eladit.com\/en\/wp-json\/wp\/v2\/elad_product\/676","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.eladit.com\/en\/wp-json\/wp\/v2\/elad_product"}],"about":[{"href":"https:\/\/www.eladit.com\/en\/wp-json\/wp\/v2\/types\/elad_product"}],"version-history":[{"count":1,"href":"https:\/\/www.eladit.com\/en\/wp-json\/wp\/v2\/elad_product\/676\/revisions"}],"predecessor-version":[{"id":1035,"href":"https:\/\/www.eladit.com\/en\/wp-json\/wp\/v2\/elad_product\/676\/revisions\/1035"}],"wp:attachment":[{"href":"https:\/\/www.eladit.com\/en\/wp-json\/wp\/v2\/media?parent=676"}],"wp:term":[{"taxonomy":"elad_product_cat","embeddable":true,"href":"https:\/\/www.eladit.com\/en\/wp-json\/wp\/v2\/elad_product_cat?post=676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}