Mojix
®
STAR 1000 System User Manual
41
Appendix E: Manual eMux Calibration
eMux’s are generally manually calibrated as they are being installed as they may be in hard to reach areas. To manually
calibrate an older revision eMux, you will need:
(1) A connected system with all devices prior to the needed eMux including:
a. A networked STAR receiver
b. A networked master controller
c. All planned eNodes between eMux and STAR connected
(2) A spectrum analyzer (with DC Block and TNC male connection)
(3) A small flat head screw driver with at least a 2” neck
(4) A power source where the eMux is to be implemented
(5) An eMux with power brick
(6) A terminated LMR240 cable with known loss (recommend 1 dB.)
Step 1:
Set the STAR to Transmit a single channel tone
1. From Mojo application, select single channel by turning frequency hopping off.
2. On diagnostics tab, type startcwtx
Step 2:
Plug the power cable into the eMux and connect the coax cable planned as the input to the eMux to a
spectrum analyzer
1. Be sure to connect the spectrum analyzer through a DC Block.
Warning: failure to use a DC Block could
significantly damage the spectrum analyzer.
2. You may need an adapter to connect your spectrum analyzer to the DC Block, or to the coaxial cable. LMR240
coaxial cable is straight TNC for Mojix systems.
Step 3:
Measure the power level of the signal from the coaxial cable (planned to go into the input port on the
eMux) and record this level. This level must be above -10 dBm.
1. If the signal planned to come into the input port is below -10 dBm, you must put the eMux into the system
earlier in the chain where there is less insertion loss.
2. After measuring the power level, connect the coaxial cable directly into the input of the eMux.
3. Record the serial number of the eMux.
Step 4:
Determine which output port will have the most gain.
1. With the input connected on the eMux, connect a cable to the first output port of the eMux (the output port
closest to the power supply connection.)
2. Attach the other end of the cable to an available eNode.
