| 摘要 |
<p>The invention provides a method and circuitry for transmitting signals in both a narrow band, mobile-receiver type of AMR network and also for operation in the frequency--hopping, spread-spectrum, fixed-receiver type of AMR network. Unlike systems provided with multiple transmitters, the invention provides this in a single transmitter operating with common circuitry to transmit in two modes of transmission in a single operational sequence.</p> |
