User's Manual

PRODUCT OVERVIEW
001-7001-100 Version 1 Page 13 of 65 Vanguard 3G User Manual GSM
Version
W
R
≥23.6"
(
60cm
)
G
≥8"
(
20cm
)
≥8"
(
20cm
)
≥5/8
λ
915 Μ Hz: 8" (20cm)
T
To reduce potential radio interference to other users, the antenna type and its gain should be
so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that
permitted for successful communication.
2.8.5 Antenna Spacing
Referring to Figure 6 for illustration, Vanguard 3G radiomodem commonly uses four separate
antennas:
•
“T” - Main transceiver -
Constraints are the limit of 20 cm and omni-directional factors
•
“R” - Auxiliary receiver –
Constraints are the receiver spacing of at least 5/8 λ (wavelength) from transceiver antenna and
omni-directional requirements
•
“G” - Global Positioning System (GPS)
Constraints are TX spacing of at least 60cm/23.62 inch from all transmitting antennas and a
clear view of the sky.
•
“W” – WiFi antenna
Constraints are TX spacing of at least 8 inches or 20 cm from all transmitting antennas
Note: For units utilizing diversity cellular antennas, best overall operation is achieved utilizing
antennas with equal gains
WARNING: As per FCC rules, all Vanguard 3G transmitting antennas should be at a minimum of
eight (8) inches (approximately 20 centimeters) from all persons.
T- Primary Antenna
R-Diversity Antenna
G-GPS Antenna
W-WiFi Antenna
Figure 6 - Antenna Spacing
4
4
The diagram is not drawn to scale
Preliminary