Vertex Standard VXR-1000 (UHF) Service Manual page 6

Installations
VXR-1000 Connections
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Pin 1: GND
Signal Ground
Pin 2: Mobile Transmit Audio
Receive audio output from the VXR-1000, passed to
the MIC jack of the mobile transceiver.
Output impedance can be changed via jumper JP1004.
open: 4.7 kΩ, short: 600 Ω (default: open).
Output level can be changed via jumper JP1005 (range)
and VR1007 (value).
open: -15 ~ +7 dBm, short: -40 ~ -15 dBm (default: short).
Frequency response (pre-emphasis on/off) can be
changed via CE-22 software (default: off).
Pin 3: Power Supply Control
The polarity of the "Power Supply Control" line can
be changed via jumpers JP1001/1002/1003.
high: 3 ~ 16 V
JP1001 J1002
short short
short open
open short
open open
Pin 4: Mobile PTT Output
This pin controls the mobile transceiver's TX/RX status.
This pin is an open-collector, "active-low" circuit.
When this pin closes to ground,
the mobile transceiver is switched into the T
mode. Maximum current: <20 mA.
Pin 5: Vcc (13.8 V)
This pin is the DC power supply connection for the
VXR-1000.
Maximum current: 2A.
Pin 6: Mobile Receive Audio
Receiver audio input to the VXR-1000 from the mobile
transceiver.
6
Ž  Œ
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Function
J1003
VXR-1000 turns on when
open
this pin connects to ground.
VXR-1000 turns off when
short
this pin connects to ground.
VXR-1000 turns off when
open
this pin is "high" level.
VXR-1000 turn on when this
short
pin is "high" level.
RANSMIT
Input impedance: 100 kΩ
The input level can be changed via CE-22 (range) and
VR1002 (value).
CE-22 EXT MOD level "HIGH": –18 dBm ~ –2 dBm
CE-22 EXT MOD level "LOW": –36 dBm ~ –18 dBm
Frequency response (de-emphasis on/off) can be
changed via CE-22 (default: off).
Pin 7: Mobile COR Detect
Squelch control input (including the effect of a CTCSS
or DCS detected tone) or audio mute line, also known
as a "B " line.
USY
When this pin is at "high" level (mobile radio Squelch
the VXR-1000 is commanded into the T
Squelch open: 3 V, Squelch closed: 0 V.
Squelch open: >3 V, Squelch closed: 0 V.
This input level can be switched between "Squelch
open" and "Squelch closed" when this pin is at "high"
level via CE-22.
Impedance: 1 MΩ.
The Squelch Threshold level can be changed by ad-
justment of VR1003.
Pin 8: Mobile Microphone Audio
Mobile microphone audio input. This is the same au-
dio which is being sent to the mobile radio's Mic Amp
circuit (i.e. the microphone's audio is "split" between
the mobile radio and the VXR-1000)
Input impedance: 100 kΩ
The input level to the mobile transceiver can be
changed via CE-22 (range) and VR1001 (value).
CE-22 EXT MIC level "HIGH": –18 dBm ~ 0 dBm
CE-22 EXT MIC level "LOW": –44 dBm ~ –18 dBm
Pin 9: Mobile TX detect/Mobile Microphone PTT
Mobile Tx/Rx control input.
This input function can be switched between "Mobile MIC
PTT" input and "Mobile Tx Detect" line input via CE-22.
This input level can be switched between "Tx" and
"Rx" when this pin is at "high" level via CE-22.
Input impedance: 10 kΩ.
Note:, When the VXR-1000 is used in a Trunking sys-
tem, the "Mobile TX Detect" input signal must be re-
ceived from the mobile transceiver when connected to
the Trunking system (the VXR-1000 checks this pin's
level to confirm successful connection to the trunking
system). When this pin is at "high" level (>3 V), the
VXR-1000 is commanded into the T
When a successful "handshake" occurs with the Trunk-
ing system, this line goes "low" and the VXR-1000 is
released into the R
ECEIVE
mode.
RANSMIT
mode.
RANSMIT
mode.
),