User Manual

Table Of Contents
Appendix A - External Antenna Landis+Gyr
36 98-1138 Rev AD Gridstream SCADA/DA Single Board Radio
Ground Plane Specifications
NOTE: Please note this antenna requires a ground plane (MMG P/N 17-1000-A). The ground plane
should be at least six inches in diameter. See Figure A - 2
Figure A - 2. Ground Plane Specification
If the enclosure for the board is metal and at least 6" across, and the antenna is connected directly to
the enclosure, no ground plane is required, as the enclosure is the ground plane. The radiation pattern
of the recommended antenna is of a traditional dipole (RF pattern as a donut). The orientation of the
antenna should be in the vertical position (straight up or straight down), such that the RF pattern is
omni-directional in the horizontal plane.
RF External Antenna Cable Specifications
An external antenna is connected to the board via an RF coaxial cable of the type as shown in Figure
A - 3. See page 49 for the product data sheet.
Figure A - 3. RF Coaxial Cable
The cable has a Reverse-Polarity N-Type Female/Jack connector on one end and an MCX Male
connector on the other. This cable is available from MMG in lengths of 6", 12", and 18".
The MMG part numbers and typical insertion loss for these cables are shown in Table 1:
Table 1. Part Numbers and Typical Insertion Loss
Length (inches) Part number Insertion Loss
6 21-1000-0 0.23 dB
12 21-1001-0 0.40 dB
18 21-1002-0 0.54 dB
draft 29 Jan 2013