Hardware Settings; Functional Description; Trunking Operation - Vertex VXR-1000 Service Manual

H
ARDWARE
JP1004: Controls the output impedance of the
transmit audio line to the mobile radio.
Short: low-Z (600 Ω); open: high-Z (4.7
kΩ) *
JP1005: Controls the maximum drive level of
the transmit audio output to the mo-
bile.
Short: low level output (0-100 mV)*;
open: high level output (0-5 V).
JP1001/1002/1003:
Polarity of Power supply control. De-
fault setting: active high (JP1003: short).
VR1001: Mobile Microphone level
VR1002: Mobile RX Audio (External Modula-
tion level)
VR1007:Mobile TX Audio (output level)
The VXR-1000 has a fixed 3 minute time-out tim-
er for base to handheld transmissions. If the
mobile COR is active for more than 3 minutes it
will send a error blip and cease transmission
until the mobile COR is inactive.
F
UNCTIONAL
When the user leaves the vehicle, they activate
their mobile radio via its front panel or a sepa-
rate switch. When the mobile radio is receiving
a signal, the VXR-1000 will begin transmitting
on the hand-held's receive frequency. The user
is able to hear and respond to all radio traffic,
including other hand-helds on the same frequen-
cy. The repeater jumpers and potentiometers are
custom-configured for use with the particular
mobile radio to which it will be connected. The
CE-22 software is used to program the repeater
for the required operating parameters.
S
ETTINGS
* default setting
D
ESCRIPTION
Operating Manual Reprint
T
RUNKING
When the radio is connected to a trunking mo-
bile you wish to access the system from your
handheld radio, key the handheld briefly then
release the PTT key. The radio will attempt to
acquire a voice channel on the trunking system
by keying the mobile for 200 mS and monitor-
ing the "on-air detect" line from the mobile. If
the VXR-1000 does not see the radio transmit at
all (system is busy), it will send a low tone to the
handheld to alert you that the system is busy.
The radio will automatically retry every 5 sec-
onds and send a "busy" tone to the handheld
with each unsuccessful attempt, to indicate
progress of the call attempt. If unsuccessful af-
ter 30 seconds, the radio will transmit an "inter-
cept" tone to alert the handheld that the call at-
tempt failed.
When the VXR-1000 detects that the mobile is
transmitting, it will continue to monitor the "on-
air detect" line until the transmitter remains
keyed for at least 250 mS to determine if the ra-
dio is merely handshaking or retrying. After
successful acquisition of a voice channel, it will
continue to hold the mobile's PTT active for 2
seconds and transmit a "go-ahead" blip to the
handheld. You may then key their handheld to
speak on the voice channel. If you do not key
up within the 2-second period, the radio will un-
key the mobile and send the "intercept" tone, as
before.
O
PERATION
3