The “QDX” (QRP Labs Digital Xcvr): a feature-packed, high performance, four-band (80, 40, 30, 20m) 5W Digi-modes transceiver kit, including embedded SDR receiver, 24-bit 48 ksps USB sound card, CAT control, synthesized VFO with TCXO reference. QDX transmits a SINGLE SIGNAL, it is not an SSB modulator with associated unwanted sideband and residual carrier, or intermodulation due to amplifier…
simple “digital” monoband transceiver SDT21 The goal of this project was the development of a simple to build CW monoband transceiver based on the direct superheterodyne principle with crystal control a la “PIXIE” or “Rockmite”, but with much better technical data. To minimize the circuit effort, the concept should be as highly integrated as possible…
General description and the advantages of the OM4001A amplifier. (Also read : https://www.cqdx.ru/ham/qro-qrp/om4001a-hf-linear-amplifier/) The OM Power model OM4001A is an automatic power amplifier, designed for use on all short wave amateur bands from 1.8 to 29.7 MHz (including WARC bands) and all modes. It is equipped with a two pieces of ceramic tetrode FU728F. The…
“Malahit DSP1” Radio Receiver. Is a portable near pocket sized STANDALONE (no computer required) “Wide Coverage” DSP radio receiver using SDR software (software defined). Includes it’s own color 3.5 inch LCD touch screen , internal lithium ion battery with charging circuit and constructed in a robust lightweight metal case. Also contains a fairly large built…
B1-Plus Specifications: Radio: 136-174, 400-490Mhz, FM Wide/Narrow, DMR Tier II Suitable Industry: Amateur Radio Features: HT Transceiver: 4Watts DMR+Analog, VHF / UHF Selling Points: LTE 4G smartphone,IP67 rugged,PTT:DMR+UHF/DMR+VHF(optional),POC Display: 4.0 inch Touch Panel: 5 points capacitive screen,support rainwater operation,IPS. Resolution: 640 X 1136 Pixels TFT LCM Sim: Dual SIM,Dual standby ,the third SIM card for private network(Optional) Network: GSM, WCDMA, EVDO,TD-SCDMA,TDD/FDD-LTE Band: 2G GSM850/900/1800/1900;3G:WCDMA850/900/1900/2100…