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Selecting Antennas
Select an antenna based on your product and application. Typically, both antennas are the same and either can be
the main receive antenna.
Placing External Antennas
Antennas are usually a quarter wavelength apart from each other. With multiband radios where the quarter
wavelengths in each band are diverse from each other, this rule may not be practical. Choose spacing based on the
band used most often or the band with connection difficulty. Some environments are harsher on particular bands.
MultiTech products have antenna connectors at the best spacing for the product size.
Placing antennas in close proximity to each other is not optimal, but you can do it if necessary. It depends on the
signal strength to and from each antenna.
If the antennas are too close together for your application, use a similar antenna on a short cable for the second
receive only antenna.
Placing GPS Antennas
GPS antennas need a clear view of the sky. Position the GPS antenna so the diversity antennas do not block its
view of the sky.
Antenna Approvals and Safety Considerations
Note the following:
Carriers conduct antenna diversity tests.
There are no EMC concerns about antenna diversity.
All antennas need to have a minimum flammability rating.
Safety requirements depend on your final product.
Unless otherwise noted, antennas certified by MultiTech are not approved for outdoor use. Do not extend
these antennas outside of any building.
Diversity and Power Draw
There are no significant power draw differences.
OEM Integration
FCC & IC Information to Consumers
The user manual for the consumer must contain the statements required by the following FCC and IC regulations:
47 C.F.R. 15.19(a)(3), 15.21, 15.105 and RSS-Gen Issue 3, Dec 2010; 7.1.2 and 7.1.3
FCC Grant Notes
The OEM should follow all the grant notes listed below. Otherwise, further testing and device approvals may be
necessary.
FCC Definitions
Portable: (§2.1093) — A portable device is defined as a transmitting device designed to be used so that the
radiating structure(s) of the device is/are within 20 centimeters of the body of the user.
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SocketModem
Cell MTSMC-LSP3 Device Guide
ANTENNAS
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