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Yes, not really low cost, but I could not resist to present you the reference in terms of compact SDR Monitoring receiver. It is covering 9KHz to 6GHz with panscope up to 20 MHz, high agility, and a 1Gbit LAN interface for remote control...Among many other features. Datasheet comprising some block diagrams can be downloaded here : http://www2.rohde-schwarz.com/file/EB500_bro_en.pdf
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Scoop.it!
Few diodes, one transistor, few inductances, resistors and capacitors...An antenna, a PC, and that's it.
Scoop.it!
Here is a simple compact software that supports SSB modulation and PSK31 digital mode, in RX as well as TX mode. Panscope uses Polyphase FFT, a very efficient FFT method.
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Perseus from MicroTelecom has been one of the first "open market" direct sampling receiver. It provides 10 KHz to 30 MHz reception throught a 14 bits 80 MSps ADC with an reasonable price. USB2.0 is used to interface with a conventional PC. Reception panscope can go up to 1.6 MHz bandwidth. A fairly good variety of SDR software support Perseus.
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Many people are reluctant to use MultiPSK, as it is considered as "too complex", or "not user-friendly". Maybe. However, it is by far the most complete software for decoding and transmiting in digital modes. It is compatible with a lot of SDR hardware, among which, all the I/Q hardware. Pure performance is usually outstanding in most of the modes. Last but not least, it can be interfaced to TCP/IP, as well as other systems.
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WebSDR...How to experiment SDR Radio, without hardware nor software ! Tens of remote SDR receivers all over the world, that you can control and use for your distant radio experimentations through one of the most fluid and low datarate SDR server to multi-client protocole...
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Tasić has designed a lot of interesting HF (0 to 30 MHz) QSD/QSE based transceivers.
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The SoftRock hardware that appeared in the begining of the 21st century, gave a long line of simple products. SoftRocks are based on QSD (Quadrature Sample & hold Detector) for receivers, and QSE (Quadrator Sample & hold Exciter) when a transmiter is needed. QSD and QSE have been invented by Dan Tayloe and provide a direct conversion to I/Q interface.
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MultiDem is from the MultiPSK's author. It provides a classical SDR transceiver for basic modulations (AM/SSB). One of the major advantages of MultiDem, is its efficient Transmit mode, where most of SDR PC-based software only offer reception, or poor Transmit mode.
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SoDiRa is not enough popular in the low-cost SDR PC-Based world...Where it is a terribly compact and efficient Software, compatible with whatever I/Q receiver, and some others. Additionally, it directly decodes DRM stations, among other traditional modulations. A must see.
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One of the most complete, versatile, and long time optimized toolbox for SDR. It is also probably the most flexible toolbox you can find for free...A must...For experts !
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