Frequency synthesized multichannel radio apparatus
First Claim
1. A multichannel radio apparatus comprising in combination:
- a transceiver including a frequency synthesiser and programmable storage means for storing predetermined channel frequency information;
a remotely mountable control unit coupled to said transceiver, said control unit including means for selecting any one of a plurality of channels and an electrically alterable storage means, said electrically alterable storage means storing preselected addresses of locations in the programmable storage means which relate to said predetermined plurality of channels, said control unit further including an externally accessible interface adapted to operatively couple said electrically alterable storage means to a data transfer unit for programming or reprogramming the preselected addresses stored in such electrically alterable storage means to thereby change the channel frequency information for said plurality of channels.
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Accused Products
Abstract
A frequency synthesized multichannel radio apparatus comprising a synthesized tranceiver and a remotely mountable control unit. All the possible channel frequencies available to users in a large geographical area are stored in a PROM mounted in the transceiver said PROM serving as a look-up table. The addresses of those channel frequencies in the PROM which are available to a particular user are stored in an electrically alterable storage means, such as an EAROM or a E2 PROM, contained in the control unit. In normal operation a channel selector in the control unit selects a particular channel in the electrically alterable storage means which in turn reads-out addresses of predetermined locations in the PROM which supplies data for example synthesizer divide numbers to the frequency synthesizer. If the channel frequencies available to a user have to be changed then with the apparatus remaining in situ a data transfer unit which has been preprogrammed with the addresses of the new channel frequencies is connected to the electrically alterable storage means and the new sequence of channel frequency addresses is stored therein.
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Citations
8 Claims
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1. A multichannel radio apparatus comprising in combination:
- a transceiver including a frequency synthesiser and programmable storage means for storing predetermined channel frequency information;
a remotely mountable control unit coupled to said transceiver, said control unit including means for selecting any one of a plurality of channels and an electrically alterable storage means, said electrically alterable storage means storing preselected addresses of locations in the programmable storage means which relate to said predetermined plurality of channels, said control unit further including an externally accessible interface adapted to operatively couple said electrically alterable storage means to a data transfer unit for programming or reprogramming the preselected addresses stored in such electrically alterable storage means to thereby change the channel frequency information for said plurality of channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a transceiver including a frequency synthesiser and programmable storage means for storing predetermined channel frequency information;
Specification