Digital Mode References
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TGIF DMR Network
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Brandmeister DMR Network
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K4USD DMR Network
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DMR for Dummies
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VK2JI's DMR History / Primer
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Pi-Star Software Home
Raspberry Pi software load for operation of MMDVM (MultiMode Digital Voice Modem) - P25, DMR, NXDN, D-Star, and YSF
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Radio ID.net
Amateur Radio DMR ID database (Amateur P25 also uses this same ID)
Electronics Component Vendors
Radio Technical Resources
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VE2BDE's Radio Mobile
Radio coverage mapping software (limited to Amateur Bands)
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Batwing Laboratories
A wealth of programming, cabling, and other Motorola 2 way related information, mostly older equipment
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W9CR's Waris series radio information
Information on CDM- and HT- series radios
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CSI CS800D Software/Firmware
Software and Firmware revisions by Connect Systems for the CS800D dual band DMR radio
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Anytone 878 Firmware / Software
Bridgecom hosts the anytone firmware and CPS.
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Microwaves 101
From connector descriptions to the microwave mortuary - a decent "everything RF" site
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Microwaves 101 Connector Reference
I don't usually multi-link to a single site, but this is worthwhile, given all the RF connector references
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Akardam tools
Some programming and data reference tools for Motorola gear
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Communications Support Forums
A forum with information on everything from Motorola radios to consoles to Thales radios, and all the stuff in between (geared towards professionals, so a lot less ham data)
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Pyramid Service Manuals
Service manual and software for Pyramid vehicular repeaters
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FCC OET Technical Document Page
Many interesting tech documents regarding RF propogation, safety, and other subjects
General Electronics Resources
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Free PCB
A powerful free PCB layout tool
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pinouts.ru
A decent collection of computer (And many other) connector pinouts
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User Manual Guide
A large collection of user manuals for consumer electronics, including amateur radio equipment
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All Pinouts.org
Another cable and connector pinout reference - in case anyone is uncomfortable with the .ru site
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E-Service Info
Service Manual collection for Consumer and Non-Consumer equipment