| 摘要 |
Transmitter and/or Receiver Unit A frequency-hopping radio set is disclosed which includes a variable attenuator connected ahead of the antenna and serving to suppress the spurious signals generated during frequency changes and transmit/receive switching operations. In response to a control pulse, the attenuation provided by the attenuator rises from a small value to a large value and subsequently falls back to the samll value, such that during each frequency change and each transmit/receive switching operation, the antenna is decoupled from the radio set. The rise and fall of the attenuation value have a soft profile. (Fig. 1) J. Baumann 4
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