QDR
– QTech Digital Radio – Owner’s Manual – v1.4 – October 2014
www.qtech.co.nz
Page 13 of 16
A QDR variant is available which has a reverse polarity RP-SMA aerial connector
which will allow you to use the existing aerials. Please order P/N PD9119-U/G.
Note
– The RS485 cable differs depending on whether connecting to a XL4
RTU (RJ12 to RJ12) or another device (RJ12 to RJ10), the respective P/N are
CB-QDR-RS485-XL4 & CB-QDR-RS485.
Troubleshooting
Symptom
Cause
Solution
Green Status LED not
blinking when power
applied
Blown fuse
Replace fuse. Use 1 Amp
quick blow type.
Insufficient power supply
voltage
Check supply and provide
suitable power supply
No Communication
RS485 jumpers not
matching setup mode
Check settings and change
to suit
RS485 line termination
Check settings and change
to suit
Incorrect serial data rate
Check settings, ensure it is
9600 Baud, No Parity
Insufficient Rx signal
power
Use a directional antenna*
Use Workbench to measure
the RSSI. A value below -
95dbm is unlikely to be
reliable.
Incorrect configuration for
intended use
Options are point to point,
point to multipoint, repeater
* Be sure that the transmitted power from the antenna (EIRP) does not exceed the
licensed level.
