User's Manual
Thermo Electron Corporation AutoRADIO User Guide 2-1
Chapter 2
Installation
Installation requires special training and must be done by a professional
installer only.
Transceiver location typically has a significant impact on the instrument’s
performance. In general, higher placement of the antenna ensures a better
communication link. Additionally, the transceiver should be placed away
from computers, telephones, answering machines, and other similar
equipment.
Placement of the external antenna is critical to a solid data link. Other
antennas in close proximity are a potential source of interference. It is also
possible that slight adjustments in antenna placement will solve noise
problems. Approved antennas include the Bluewave Marathon BMY890K
Yagi antenna and the Bluewave Marathon BMO902J omni-directional
antenna.
Note Power output of the radio system, including cable loss, the antenna
gain, and insertion loss, should not exceed 36 dB EIRP. ▲
The choice of feedline used with the antenna must be carefully considered.
Thermo recommends using a low-loss cable type suited for 900 MHz, such
as the Bluewave BW400 or LMR400. The following table lists the signal
losses that result when using various lengths of this cable at 900 MHz.
Table 2–1. Cable length versus loss at 900 MHz
Cable type 10 Feet
(3.05 Meters)
50 Feet
(15.24 Meters)
100 Feet
(30.48 Meters)
BW400/LMR400 0.39 dB 1.95 dB 3.9 dB
Transceiver
Cable Loss