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Between 1985 and 1989, John Carrington was the CEO of British Telecom's Mobile Division and the chairman of Cellnet. It was during this period that Carrington launched Cellnet's first cellular service, following innovative development work by BT Spectrum, who built a chain of cells between London Heathrow and BT Tower in January 1985.
A plain-language radio check is the means of requesting and giving a signal strength and readability report for radiotelephony (voice) communications, and is the direct equivalent to the QSA and QRK code used to give the same report in radiotelegraph communications.
A signal strength and readability report is a standardized format for reporting the strength of the radio signal and the readability (quality) of the radiotelephone (voice) or radiotelegraph (Morse code) signal transmitted by another station as received at the reporting station's location and by their radio station equipment. These report ...
A signal tracer is a piece of electronic test equipment used to troubleshoot radio and other electronic circuitry. [ 1 ] Usually a very simple device, it normally provides an amplifier , and a loudspeaker , often battery-powered and packaged into a small, hand-held test probe .
Frequency check Blockade — 10-94 Test—no modulation—for frequency check. Give me a test Drag racing 10-95 Test intermittently with normal modulation for ... — — Prisoner in custody 10-96 Test continuously with tone modulation for ... Mental subject — 10-97 — — Check traffic signal 10-98 Prison or jail break Prison/jail break 10-99
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The two signal generators, F1 and F2, are combined using a directional coupler in reverse. That is, the two generators are connected to what would normally be the coupled and transmitted output ports respectively. The combined signal appears at what would normally be the input port.