EZCOM-LP
Professional Installers Guide
Grayhill Inc.
561 Hillgrove Ave
LaGrange, IL 60525
800-426-4383
www.grayhill.com
Version 1.5
Table Of Contents
TABLE OF CONTENTS.................................................................................................................................. 2
FCC INFORMATION....................................................................................................................................... 3
Preface..................................................................................................................................................................................................................... 3
RF Exposure Information ..................................................................................................................................................................................... 3
Physical Installation............................................................................................................................................................................................... 3
Electrical Issues......................................................................................................................................................................................................4
Antennas ................................................................................................................................................................................................................. 4
Yagi Installation................................................................................................................................................................................................... 4
Omni Installation.................................................................................................................................................................................................. 5
Mobile Installation ............................................................................................................................................................................................... 5
Thermal Considerations ....................................................................................................................................................................................... 6
FCC Information
Compliance Statement ( Part 15.19 )
This device complies with Part 15 of the FCC Rules and with RSS-210 of Industry Canada.
Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.
Warning ( Part 15.21 )
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate
the equipment.
RF Exposure ( OET Bulletin 65 )
To comply with FCC RF exposure requirements for mobile transmitting devices, this transmitter should only be used or installed at
locations where there is at least 2m separation distance between the antenna and all persons.
Preface
EZCom-LP is an OEM radio module for professional installation in products or assemblies for resale. This device is not intended or
marketed for installation by end users. Should EZCom-LP be used for fixed point-to-point operation as defined in FCC rule 15.247.(b).iii the
equipment operator, or if the equipment is professionally installed, the installer, is responsible for ensuring the system is used exclusively for
point-to-point operations.
RF Exposure Information
When used in a fixed configuration with the Yagi antenna or a mobile configuration with the omni-directional antenna the antenna should be
located at least 2 meters from normal human proximity.
Physical Installation
The unit should be firmly attached at four mounting points. The holes are sized for #6 screws and are 5.7” apart on in the long
dimension and 1.125” apart in the short dimension. It is critical that the mounting method not touch any of the components mounted on the
PCB. Vibration mounts should be used if the device is expected to see shock or vibration in excess of 1G.
The SMA connectors should be secured with 8 ounce-inches of torque. Ensure that the cabling does not present more than a few
pounds of stress to the connectors themselves. With enough leverage, (such as seen with 0.5” and larger coax) it is possible to break the solder
joints on the connectors.
Electrical Issues
The system supply must be 5V +/- 2%. As the main power amplifier runs directly off the 5V supply with only passive filtering it’s important to
keep the voltage within these limits. Under voltage will cause the unit’s microprocessor to enter reset mode. Over voltage could potentially
damage the transmit section. A power supply able to deliver at least 1 Ampere should be used. Place the supply close to the radio (less than 3
feet), use 22 gauge or larger wire and if possible provide a 470uF or larger capacitor between power and ground where it enters the radio. The
capacitor isn’t needed if the supply can be shown not to droop out of voltage tolerance when the radio transmits.
Antennas
Use only the following antennas:
Antenex YB8966 9.2 dBd yagi, must have at least 2.3 dB of cable loss (60 feet of LMR400, or equiv.)
Maxrad MFB9157 7 dBd omni, must have at least 0.2 dB of cable loss (5 feet of LMR400, or equiv.)
Antennas of the same type but with lower gain may be substituted if desired so long as the cable lengths are not changed from those tested.
Antennas of higher gain are prohibited. Contact Grayhill if you feel you must use a higher gain antenna.
Yagi Installation
Figure 1. Recommended Antenex Yagi antenna configuration.
The Yagi antenna should be mounted on a tower or pole with clear line of sight to the target radios. As a Yagi antenna concentrates it’s gain
along the direction of the long axis care should be taken to point the Yagi at the target radios as well as can be managed. Under no
circumstances may the antenna be operated within 2 meters of a human body. Under no circumstances may the Yagi antenna be operated with
less than 2.3dB of cable loss based on the type of coax used. When in doubt use only the pre-measured, Grayhill supplied antenna cable. The
installer is responsible for ensuring that the total radiated power is less than +36dBm.
Omni Installation
Figure 2. Recommended Maxrad omnidirectional antenna configuration.
Installation of the omni-directional antenna is similar to the Yagi antenna except that the antenna needs no pointing. Under no circumstances
may the antenna be operated within 2 meters of a human body. The omni-directional antenna must be installed with a minimum cable loss of
0.5dB based on the type of coax used. When in doubt use only the pre-measured, Grayhill supplied antenna cable. The installer is responsible
for ensuring that the total radiated power is less than +36dBm.
Mobile Installation
While EZCom-LP may be used in mobile installations, under no circumstances may the antenna be operated within 2 meters of a human body.
The installation must take this into account. Should you need to create an installation where an antenna is closer than 2 meters contact Grayhill
to arrange for the exact installation to be tested and submitted for FCC approval.
Thermal Considerations
The unit is rated for operation from –40C to +80C. Ensure that the enclosure temperature stays within these limits even when exposed
to direct sunlight or wind. The unit doesn’t generate much heat by itself even while transmitting data. The TX duty cycle is usually less than
30% so don’t rely on the unit to heat itself.
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