User's Guide

MLink Ultra User’s Guide Page 8 4/1/2021 1:39 PM
106, 4715 - 13th St. NE, Calgary, Alberta, Canada, T2E 6M3
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8.3.2 External Antenna
Mlink Ultra modules have been approved for use with an external Yagi antenna captured below
including a 1.2 dB min cable loss. External antenna types with the same or lower maximum gain
are permitted for use with MLink Ultra. Professional installation is required for the external
antenna.
Manufacturer
Part Number
Type
Gain
Application
Min
Separation
MaxStream Inc
or
Laird Technologies
A09-Y8NF
or
PC904
4
Element
Yagi
4.8 dBd
1
Mobile and
Fixed
20 cm
Note 1: Including 1.2 dB min cable loss as captured below:
 5 ft min of RG-174 (27.9 dB/100 ft @ 900 MHz)
 7 ft min of RG-58/RG-8X (20.1 dB/100 ft @ 900 MHz)
 16 ft min of RG-213/LMR240 (7.7 dB/100 ft @ 900 MHz)
 32 ft min of LMR-400 (3.9 dB/100 ft @ 900 MHz)
50 Ω microstrip
transmission line to
antenna.
PI matching circuit
The matching is only needed to optimize
the antenna matching depending ultimate
environment around the antenna.
To Antenna
To Ultra
50 Ω microstrip
transmission line
to Ultra.
Ultra Module