phone lines
8 links
Antennas : Feed Lines : Choke
- High Performance common-mode chokes
- May 2015 Radcom Article on common-mode chokes that can be used for control cables, phone lines, but mostly on typical HF antenna systems. This article explain what common mode chokes does, why you meay need one, properties common mode chokes should have, how to build and measure performances.
[ Hits: 681 | Votes: 1 | Rating: 10 ]
- 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
[ Hits: 2545 | Votes: 3 | Rating: 4.33 ]
- 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
[ Hits: 4899 | Votes: 2 | Rating: 10 ]
- 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.
[ Hits: 7943 | Votes: 14 | Rating: 4.79 ]
- AI Projections for Ham Radio Modes in 2023-2025
- In an innovative analysis, Michael G7VJR employs NeuralProphet to predict ham radio modes' usage trends. The AI model, leveraging deep learning, forecasts a steady FT8 dominance, with slight declines in CW and Phone activities. This approach simplifies statistical predictions, showcasing the power of AI in understanding complex patterns and facilitating insightful time series projections. Access the freely available Club Log data for continuous exploration.
[ Hits: 52 | Votes: 0 | Rating: 0 ]
- 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.
[ Hits: 770 | Votes: 0 | Rating: 0 ]
- An Inexpensive Microphone Selector Switch
- Take a commercially available switch box intended for switching data lines such as printer cables between two computers, and change out the connectors so that it can be used to switch between two microphones to one transceiver.
[ Hits: 254 | Votes: 1 | Rating: 7 ]
- Telephone Interference
- Telephone EMI, questions and answers on how to solve interference problems to phone lines
[ Hits: 1023 | Votes: 0 | Rating: 0 ]
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