308 Industrial Park Road
Starkville, MS 39759 USA
P h:
(662) 323 -953 8 F AX: (662) 32 3-655 1
GPG-2B
5/8 Wave Ground Plane for 142 -185 MHz
INSTRUCTION MANUAL
GENERAL DESCRIPTION
The Model GPG-2B is a 5/8 wave gain ground
plane which covers the frequency range of
142-185 MHz. The design is optimized for
maximum performance in the 2-meter Amateur
band (144-148 MHz), and provides 3.4 dB
gain over a 1/4 wave ground plane antenna.
The GPG-2B, when tuned for a specific
frequency within 142-185 MHz will have a
VSWR at resonance of less than 1.4:1. Typical
VSWR at resonance within the 2-meter
Amateur band is less than 1.2:1. The 2:1
VSWR bandwidth is greater than 4 MHz.
This antenna is designed to be fed with any
standard 50 ohm coaxial cable, but for runs
over 50 feet, RG-213/U is recommended
because of its lower losses and higher power
The mechanical strength of the GPG-2B has
been greatly improved over previous models.
Also, stainless steel hardware is used in most
places on this antenna.
The GPG-2B will mount on mast sizes up to 1
5/8 inches in diameter.
Figure 1
Overall View - GPG-2B
SPECIFICATIONS
VSWR at Resonance................................................................................. less than 1.4:1
Power Gain .... ...
.... ................................................... 3.4 dB over quarter wave
Power Input..... ..
................................................................................100 watts'
Lightning Protection
. ........................................................................... DC ground
Height(nominal).........
... ..............................................................................50 inches
Wind Area.............
....................................................................0.30 sq. ft. (.03 sq m.)
Maiximum Mast OD ...................................…............................................ 15/8 inches
(41.3 mm) Hardware..........................................................................18-8 stainless steel
