Motorola VRS750, Service Manual

Page: 23 / 104

11
The third window is the VRS Advanced subsection (see Figure 10).
This window is used to enable/disable the Access Acknowledgment
and Time-Out-Timer Tones and Repeater Portable Priority Interrupt
(PPI) as well as selecting the Time-Out-Timer duration. The Time-Out-
Timer duration may be set to 30, 60, or 120 seconds, or infinite. The
infinite setting should be used with caution, since damage to the
transmitter could result from any extremely extended transmission. It
should be noted that the Repeater PPI feature must be enabled to allow
the multi-unit priority algorithm to function correctly when there will
be multiple VRS units on scene. The time between interrupts may be
set to
Fast (500 ms) or Slow (2 seconds) for conventional modes and
Fast (500 ms) or Slow (1 second) for trunked modes.
NOTE: When using Rptr PPI, the receiver squelch setting of
the portable must be programmed for CSQ (carrier
squelch).
The fourth window is the VRS Personality subsection (see Figure 11).
The VRS Personality sets the VRS Frequency Band, Simplex
Frequency, Channel Spacing, and TX Output Power for the VRS750.
The VRS750 can be programmed for 12.5, 20, or 25 kHz Channel
Spacing with a High or Low output power (factory power settings are
2 W for High and 275 mW for Low). Note that the
VRS Personality
will allow the Frequency Band to be set to VHF, UHF R1, or UHF R2
regardless of which model VRS750 is being used, but upon power up
the error message “VRS 001” will be displayed if the frequency band is
incorrect.
Figure 10. VRS Advanced Window
(Radio Configuration --> Radio Wide --> VRS Advanced)