GSE Scale Systems Tech Note: RF Comm Devices: Range
Maximize your RF Range
RF Communication devices from GSE include a low-gain 2.1 dB dipole antenna made for
general purpose use. Low-gain antennas cover more area so they are easier to use, and perfect for
most applications. GSE’s RF devices, on the radio spectrum, range from VHF (Very High Frequency)
to EHF (Extra High Frequency). The amount of energy that an RF device is permitted to radiate over
the air is regulated by government agencies. The SR (900 MHz Short Range), and LR (900 MHz or
2.4 GHz Long Range) devices utilize license-free ISM bands and do not require any further commercial
licensing or Approvals.
If buildings, metal, hills, vegetation, and etc. are interfering with, or obstructing signals, you may need
to optimize your transmission environment. Here are some ways to maximize the RF signal strength
within regulations:
1. Match orientation of sending and receiving antennas (vertical or horizontal).
2. Keep as far from metal structures or objects (at least several inches) as possible.
3. Elevate an antenna on one or both ends. See chart on p. 2
4. Improve RF Line-of-Sight (LOS). See types on p.2.
5. Install a 3rd party high-gain antenna. See below.
NLOS (Non Line of Sight) High Gain Directional
(yagi type) Antenna 11dBi 900MHz 8 element
Available at Pasadena Networks:
http://pnt.zoovy.com/product/YA9-11?META=froogle-YA9-11
Close-Up
Difference between Low– and High-Gain
Low-gain omni-directional antennas direct signals in more directions and shorter distance. Highgain
directional antennas direct signals in one direction and farther distance. Depending on the
size of the company, and number of Indicators being used, low-gain is usually the best choice
because more area is covered. From an information assurance standpoint, data is also safer
because the signal traveled a shorter distance.
In non-LOS (line-of-sight) situations, GSE’s RF devices will have approximately a 1500 ft (450 m)
range with low-gain dipole antennas. With a high-gain antenna that range may be extended to
approx. 3500 ft (1060 m). On the other hand, in outdoor LOS (line-of-sight) situations, installing a
3rd party high-gain antenna will boost a range to up to 20 miles (32 km).
RF Comm Devices: Range
