902-928 MHz and 2.4 GHz ISM Band Wireless Modem Antennas
We offer an assortment of directional and omni-directional antennas. While there are many factors to consider in making an antenna decision there are 3 inescapable truths:
1) Height is everything.
2) The radio will only perform as well as the antenna and cable connected to it.
3) Height is everything.
DGR spread spectrum transceivers have a range specification of 20 miles with a 3" long unity gain whip antenna. Using external antennas will improve performance. In general, Yagi antennas should be used for longer point-to-point links and omni-directional antennas should be used for shorter multipoint links. For example, Yagis may be used for back-to-back repeater systems.
However, these are simply guidelines, and with proper placement the type of antenna becomes secondary. We offer the following antennas as well as many others. The omni-directional antennas may be used with either bracket or magnetic mounts:
Antenna Part Number
45ƒH / 55ƒV beamwidth; 100 MPH wind load
50ƒH / 45ƒV beamwidth; 100 MPH wind load
40°H / 40°V beamwidth; 100 MPH wind load
100°H / 60°V beamwidth; 100 MPH wind load
Donut pattern, no ground plane required
Donut pattern, open coil
(Vertical or Horizontal Polarization) 70 Degree Horizontal Beamwidth and 55 Degree Vertical Beamwidth
(Vertical or Horizontal Polarization) 45 Degree Horizontal Beamwidth and 40 Degree Vertical Beamwidth
(Vertical Polarization) 35 Degree Horizontal Beamwidth and 20 Degree Vertical Beamwidth
17" x 1.15"
32 Degree Vertical Beamwidth; 100 MPH Rated Wind Velocity
17" x 1.15"
17 Degree Vertical Beamwidth; 100 MPH Rated Wind Velocity
Vertically Polarized; 125 MPH Rated Wind Velocity
40" x 1.15"
7 Degree Vertical Beamwidth; 100 MPH Rated Wind Velocity
We also can provide omnidirectional antennas with a horizontal polarization. Horizontal polarization may be very useful when one of the transceivers in a link is co-located near a paging or cellular tower. This effectively lowers the overall noise floor by up to 20dB. When using Yagi antennas this is accomplished by turning both antennas in the link so that the elements are horizontal to the ground. Out of band noise may also be reduced with the use of DGF-900 band pass filters.
Cable type and connector assembly are also very important. AIRLINX Communications uses low-loss RF cable designed for use at 900 MHz, with every cable shipped tested on a network analyzer for insertion and return loss. Many people will attempt to provide their own cable, not recognizing the implications of not using the proper cable. Performance of the transceiver will suffer drastically if the proper cable is not used.
Yagi Antennas (Black Anodized)
Yagi Antennas (Uncoated Aluminum)
Omni-directional Mobile Magnetic Mount Antennas
Higher-gain Omni-directional Antennas