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Antennas : Wire
Phone line as a SW antenna
- This article describes how to use a phone line as a shortwave receiving antenna, but be carefull telephone lines present a potential shock hazard, use at your own risk
GM Mobile RadioInstallation guidelines
- GM Radio Telephone / Mobile Radio
Installation Guidelines
WD6CNF DSP Filter
- Audio Digital Filter, two bandpass filters, three notch filters, two noise filters
graphical setting of filter center frequency and bandwidth Drag vertical lines on top of signal,
Microphone input, speaker output
Mono, 5 kHz bandwidth
DTMF decoder
- A very easy to use program to decode DTMF dial tones found on telephone lines with touch tone phones. The DTMF Decoder is also used for receiving data transmissions over the air in amateur radio frequency bands.
Lightning Protection : Protecting each I/O line
- KB22UT Article on how protecting ham radio station and in particular I/O Lines such as AC power, coax cable, control circuits, telephone line.
Telephone Interference
- Telephone EMI, questions and answers on how to solve interference problems to phone lines
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