User Manual

21
ANTENNAS
Part Number Description
QHA-4 Quadrifilar Helix Antenna with Ring-Hybrid feed
Connector: TNC Female
Must be used with SMA to TNC antenna cable
(4045174-006).
The QHA family of antennas was developed to provide a compact solution for
pattern-tailored circularly polarized antennas. This rugged antenna is omnidirec-
tional when the antenna is vertical. The pattern is slightly elevated to allow over-
head coverage. The base of the antenna includes a special flat with #10-32
threaded hole, 0.25-in. deep for mounting. It is available in both RHCP and LHCP
versions.
WARNING: Refer to Appendix A of this manual for information on the proper use
of antennas.
QHA-4
Specifications
Type Quadrifilar Helix with
Ring-hybrid feed
Polarization Circular
Peak Gain 4dBiC at 24° above
horizon
Horizontal Beamwidth Omnidirectional
Vertical Beamwidth 46°
Nominal Impedance 50 Ohms
Groundplane req. Not Required
Size 8.0” L x 1.25” dia
(203 mm x 32 mm dia)
Weight 3.7 oz. (105 g)
DTC Part Number Frequency Range
QHA-4-2-R 2.4 to 2.5 GHz, RHCP
QHA-4-2-L 2.4 to 2.5 GHz, Lhcp
QHA-4-1-R 1.7 to 1.9 GHz, RHCP
QHA-4-1-L 1.7 to 1.9 GHz, LHCP