LOCAL OPERATION
3-22
Press To Talk facility
A mode switching capability is provided by the ‘Microphone with PTT switch’ optional accessory.
See
Performance data, optional accessories, in Chapter 1.
With ‘microphone’ selected as the external modulation source and the instrument operating in the
Tx TEST mode, pressing the PTT switch causes the instrument to switch to the Rx TEST mode.
With the instrument set to the Rx TEST mode or Dx TEST mode, pressing the PTT switch allows
voice modulation of the RF signal from the Service Monitor, but mode switching does not happen.
Tones
A soft key designated [Tones] is included in the top level menus of the Tx TEST mode, Rx TEST
mode, Dx TEST mode, and AF TEST mode.
Pressing this key will display the menu shown in fold out diagram (2-5), (3-5), (4-5) or (6-5), and
give access to the ‘TONES’ test facility. This facility is used to provide modulation generators
and demodulation decoders to simulate the various coded calling signals used on mobile radio
systems for automatic selective calling of mobile transceivers.
General
The instructions for transmitter testing assume that the Tx TEST mode has been selected, and for
receiver testing assumes that the Rx TEST mode has been selected. However, these instructions
apply equally to the Dx TEST mode. References are made to Dx TEST mode to clarify this, or to
identify a difference in presentation. These references are headed *DUPLEX*.
The Dx TEST mode, the Oscilloscope function, and the TONES facility, each have a section of
this chapter dedicated to their operation.
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