ELPRO Technologies ELP905K Spread Spectrum Radio Modem User Manual man FCC 905K 1 1

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Document ID	237410
Application ID	PHSiGjWuWvMMyS2TogEF/Q==
Document Description	Yagi antenna with CC20 900 cable
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	1.24kB (15562 bits)
Date Submitted	2002-04-17 00:00:00
Date Available	2002-05-01 00:00:00
Creation Date	2002-04-15 10:58:28
Producing Software	Acrobat PDFWriter 4.05 for Windows
Document Lastmod	0000-00-00 00:00:00
Document Title	man_FCC_905K_1.1.doc
Document Creator	Microsoft Word
Document Author:	stevep

905U-K.MAN Rev. 1.1
January 2002
Dipole and Colinear antennas.
A unity gain dipole is the normal antenna for use on unlicensed channels. As it does not
provide any gain, then the power transmitted from the antenna will be the same as the power
out of the module. Dipole antennas are only available with a 15 feet of coaxial cable and SMA
connector for mounting away from the 905U-K module. Dipole antennas should be mounted
vertically, at least 1 metre away from a wall or mast.
For longer, more marginal radio paths higher gain colinear antennas can be used. These must
be used with either CC10/900 or CC20/900 cable.
1m
DIPOLE AERIAL
COAXIAL CABLE
SEAL CONNECTORS
WITH “3M 23” TAPE
SURGE DIVERTER
STRESS REDUCTION LOOP
ANT
MAST
905U.K
GND
4mm
EARTH CONDUCTOR
SHOULD BE 16mm
MAX. COAXIAL CABLE LENGTHS
CC10/900 – 33 feet
CC20/900 – 66 feet
INSTALL AERIAL ABOVE LOCAL
OBSTRUCTIONS
EARTH STAKE
IF GROUND CONDITIONS ARE POOR,
INSTALL MORE THAN ON STAKE
The 905U-K normally produces 1.0 Watt of radio power when an external DC power supply is
used. FCC regulations allow this power may be boosted to a maximum 4.0W by using a
higher gain antennas. These higher gain antennas may also be used to compensate for coaxial
cable loss. The losses are 3dB for every 10m of RG58 cellfoil. If 10m of RG58 cable is used
on a marginal radio path, then a higher gain antenna may be used to cancel the losses in the
cable and boost the transmitted power back to the maximum level.
YAGI antenna.
YAGI antennas must only be used with a cable loss of 5dB or greater so the overall system
gain is less than 6dB. So they should only be used with a CC20/900 cable.
YAGI antennas are directional. That is, they have positive gain to the front of the antenna,
but negative gain in other directions. Hence YAGI antennas are normally installed with the
central beam vertical and must be pointed in the direction of transmission to benefit from the
 ELPRO Technologies Pty Ltd
Page 21

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Page Count                      : 1
Creator                         : Microsoft Word
Create Date                     : 2002:04:15 10:58:28
Title                           : man_FCC_905K_1.1.doc
Author                          : stevep
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