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DataMover ESS User’s Guide
SIMREX MAN.ESS-01, Rev. F
SIMREX Corporation
power output to maintain compliance with the FCC’s Digital
Transmission System (DTS) Part 15 rules. These rules limit
power to a maximum of 8 dBm/3 kHz, thus the ESS-II Trans-
ceiver is factory set to +29 dBm. When calculating maximum
transceiver power output for ESS-II installations, use +29 dBm
if antenna gain is 6 dBi or less. See
How Much Output Power
Can be Used?
on Page 144
for power control of higher gain
antennas.
5.1.5 How Much Output Power Can be Used?
The transceiver is normally supplied from the factory set for a nominal
+30 dBm (+29 dBm for ESS-II) RF power output setting; this is the
maximum transmitter output power allowed under FCC rules. The
power must be
decreased
from this level if the antenna system gain
exceeds 6 dBi. The allowable level is dependent on the antenna gain,
feedline loss, and the transmitter output power setting.
NOTE:
In some countries, the maximum allowable RF output may be
limited to less than the figures referenced here. Be sure to check
for and comply with the requirements for your area.
5.1.6 Conducting a Site Survey
If you are in doubt about the suitability of the radio sites in your system,
it is best to evaluate them before a permanent installation is underway.
This can be done with an on-the-air test (preferred method); or indi-
rectly, using path-study software.
An on-the-air test is preferred because it allows you to see firsthand the
factors involved at an installation site and to directly observe the quality
of system operation. Even if a computer path study was conducted ear-
lier, this test should be done to verify the predicted results.
The test can be performed by first installing a radio and antenna at the
proposed Access Point (AP) station site (one-per-system). Then visit the
Remote site(s) with another transceiver (programmed as a remote) and
a hand-held antenna. (A PC with a network adapter can be connected to
each radio in the network to simulate data during this test using the
PING command.)
With the hand-held antenna positioned near the proposed mounting
spot, a technician can check for synchronization with the Access Point
station (shown by a lit
LINK
LED on the front panel) and measure the
reported RSSI value. (
See
“Antenna Aiming”
on Page 134
for details.)
If adequate signal strength cannot be obtained, it may be necessary to
mount the station antennas higher, use higher gain antennas, select a dif-
ferent site or consider installing a repeater station. To prepare the equip-
ment for an on-the-air test, follow the general installation procedures
given in this guide and become familiar with the operating instructions
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