Operating instructions

LOCAL OPERATION
3-16 46882-311D
AF TEST
With AF TEST selected, the
AUDIO TEST
screen is displayed and access to the AF TEST
features is available. See fold out diagram (7-0) at the end of this chapter. The RF generator is
disabled.
SYSTEMS
The SYSTEM key gives access to the SYSTEM TEST mode. If any of the system test options
have been provided on the particular Service Monitor, the user is able to carry out automatic
and/or manual tests to pertinent equipment. The use of the SYSTEM TEST mode is described in
the supplementary operating manuals, supplied when any of these options are fitted. Fold out
diagram (5-0) at the end of this chapter shows typical SYSTEM TEST mode displays. The
displays from all keys are not shown, as there are many similarities to the various systems.
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 will cause 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 will
allow voice modulation of the RF signal from the Service Monitor, but mode switching will 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 (7-5), 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 assumes 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.