FreeWave Technologies Inc. AMM0300AT Manual De Usuario
Chapter 2: Hardware and Pinouts
LIM0001AA Rev B (DRAFT)
Connectors and Cables
Use Samtec connectors for all embedded radios. The Samtec connectors and their interfaces are listed
below.
below.
Model Number
Uses Samtec Connector
Mating Samtec Connector Types
MM2-MR-T
MM2-MR-R
MTSW-110-08-G-S-000
SSW, SSQ, ESW, ESW, BCS, BSW, IDSS, IDSD,
CES, SLW, HLE
CES, SLW, HLE
MM2-LV-T
MM2-T
TMM-107-01-G-D-SM-A-P-TR
CLT, SMM, MMS, SQT, ESQT, SQW, TLE,
TCSD,TLSD
TCSD,TLSD
About Antennas
FreeWave offers many antenna options. To improve the data link, FreeWave offers various antennas with
cable lengths ranging from 13 inches up to 200 feet.
cable lengths ranging from 13 inches up to 200 feet.
Consider the following antenna characteristics when choosing an antenna for your application:
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Antenna radiation patterns / antenna type
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Power gain
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Cable loss
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Directionality
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Polarization
When using antennas, follow the guidelines for selection, location, and installation provided in the sections
below.
below.
Antenna Location
When using an external antenna, placement of the FreeWave transceiver's antenna is likely to have a
significant impact on the transceiver's performance. The key to the overall robustness of the radio link is the
height of the antenna. In general, FreeWave units with a higher antenna placement have a better
communication link. However, a higher antenna may pick up more RF noise in the area, and other antennas in
close proximity could cause interference. An adjustment as little as 2 feet in antenna placement can resolve
some noise problems. In extreme cases, such as when interference is due to a pager or cellular tower, the
band pass filters that FreeWave offers, may reduce this out-of-band noise.
significant impact on the transceiver's performance. The key to the overall robustness of the radio link is the
height of the antenna. In general, FreeWave units with a higher antenna placement have a better
communication link. However, a higher antenna may pick up more RF noise in the area, and other antennas in
close proximity could cause interference. An adjustment as little as 2 feet in antenna placement can resolve
some noise problems. In extreme cases, such as when interference is due to a pager or cellular tower, the
band pass filters that FreeWave offers, may reduce this out-of-band noise.
Note: Use the Radio Statistics, available in option 4 in the main Setup menu of the
radio to help identify problems.
Also consider the following points when locating antennas for your application:
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Identify sites with “Line of Sight”. If you cannot see it you cannot talk to it.
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Long cable runs decrease signal and increase the amount of picked up noise. For example, if you
use LMR 400 cable on a 200 foot tower, loss in the cable run alone is 8 dB over the 200 foot
distance.
use LMR 400 cable on a 200 foot tower, loss in the cable run alone is 8 dB over the 200 foot
distance.
To help optimize your antenna location, have FreeWave complete a site study for you, free of charge. To
initiate the request, complete and submit the Path Study form available from your sales representative. Email
the completed form to pathstudy@freewave.com.
initiate the request, complete and submit the Path Study form available from your sales representative. Email
the completed form to pathstudy@freewave.com.
6
Draft