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Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
Many went SDR a few years ago
GNU Radio OS download:
GNU Radio can support many protocols, and is used for everything from regular 802.11g decoding to advanced G3 cell analysis. The old AF input AX.25 signal is a very small part of it's capabilities...
Hobby level (RX only): $30 SDR USB stick: You'll likely need a $30 Up-converter and LNA front end to cover low frequency bands:
Licensed Users: $300 8bit 10MHz to 6GHz RX and TX * getting your own LNA and matching front-end is recommended * 8bit means it is mostly appropriate for designing and testing digital transceivers
Another SDR platform with full duplex transceivers:
This forum has rules about some areas of this subject matter, and I would recommend caution in how questions are presented.
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
The fundamental reason people go SDR is the IF can be directly analyzed, arbitrarily filtered, and converted for a local network stack with no additional hardware. There are numerous pre-made GNU radio modules for encoding/decoding just about anything available on the consumer market, and also utilities that scan permutations of possible standards.
There are many tutorials describing theoretical interpretations of how RF signals should be handled mathematically, and generally it makes sense if one understands how signal properties change with wavelength.
Recycling the old precision OCXO time references out of fried spectrum analyzers makes the new tools better than most application specific gear. If you know VHF gear, this stuff is far easier to get working than physical blocks from the 1980s.
IIRC, AF or RF... sending encrypted data over HAM channels is currently still illegal... and thus against forum rules.
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