For example, frequency agile radar emitters may be detected and/or classified to using techniques described herein.

The frequency agile transponder (34) can test the test points and supply to the controller (12) the results of the test.

Bidirectional communications can occur between a controller (12) and each frequency agile transponder (34) via the HFC network (2).

The reverse band modulators are frequency agile and modulate telephony signals from a subscriber in a selected one or more frequency subbands in the reverse band of the subscription network.

Each frequency agile transponder (34) includes a transmitter (T) and a receiver (R) which are connectable to a coaxial line of the HFC network (2).

When you buy or rent a wireless system, someone has to select an operating frequency (for fixed-frequency systems) or an operating frequency range (for frequency-agile systems).

The plurality of frequency agile transceivers aoperate simultaneously, each transceiver being coupled to the antenna for communication via a respective directional beam.

The satellite is equipped with frequency-agile remote-control receivers, increasing the flexibility of the ground control link.

It is equipped with frequency-agile remote-control receivers, increasing the flexibility of the ground control link.

The frequency agile transponder (34) has analog inputs/outputs connectable to test points of the one or more pieces of equipment (14, 20, 24) of the HFC network (2).

A frequency agile voltage controlled oscillator is provided in which amplitude control is performed by digitally controlling the current supplied to the oscillator from a current source (10).

One or more pieces of equipment of a hybrid fiber-coaxial (HFC) network (2) has a frequency agile transponder (34) connected thereto.