telephone
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Operating Aids : History- Evolution of Car Radios: From Marconi to Motorola
- his historical account traces the development of car radios from Marconi's mobile wireless telegraph station on a steam engine vehicle in 1901 to Motorola's iconic car radio models in the 1930s. It highlights key milestones such as Alfred Grebe's radio-telephone experiments on Long Island and the introduction of Marconi-Phone 8 radios by the Daimler Company in England. The narrative explores technological advancements, including the transition from TRF to Super-Heterodyne circuitry and the integration of push-button controls. The evolution from vacuum tubes to transistors and compact discs is also documented, showcasing the continuous innovation in automotive entertainment systems.
[ Hits: 47 | Votes: 1 | Rating: 1 ]
- 16 DTMF Tone Generator Keypad App
- This app will give you a 16 tone DTMF keypad and the ability to generate custom DTMF sequences, and set the duration and tone to silence ratio. Includes the characters 1234567890*# and the menu tones ABCD. You may enter a custom sequence via the keypad, soft keyboard, or speech if your device already has speech-to-text capability.
This is basically a touch tone telephone keypad, which may be of interest to amateur ham radio repeater operators
[ Hits: 723 | Votes: 4 | Rating: 7.75 ]
- Grounding HF Transceiver using Coax Cable
- Improper grounding or earthing system can cause several unwanted RF interferences (RFI) to television sets, broadcast receivers, hi-fi sets and telephone sets.
In this Article the author explain how to setup a proper radio shack grounding using coaxial cable and ceramic disc capacitor
[ Hits: 1283 | Votes: 4 | Rating: 7.75 ]
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