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ComTekk Software - Tone generator for 2-way radio signaling. Use sound card to generate CTCSS, DTMF, tone remote, ANI and more.

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Midian Electronics

Electronic Ciruits portal of free electronic circuits, schematics, designs, or diagrams & other resources for engineers, inventors & students.

Scientific Literature Digital Library incorporating autonomous citation indexing, awareness and tracking, citation context, related document retrieval, similar document identification, citation graph analysis, and query-sensitive document summaries. ...

AbVolt is a consulting company that specializes in the design and development of electronic hardware and software for the embedded systems.

ComTekk Software - Tone generator for 2-way radio signaling. Use sound card to generate CTCSS, DTMF, tone remote, ANI and more.

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The Repeater Builders Technical Information Page - a library of hands-on reference material for the repeater builder, be he (or she) amateur radio, commercial radio, LMR, public safety, CAP, GMRS, or ???

wiseGEEK: clear answers for common questions