beautypg.com

Vectronics VEC-896 User Manual

Vec-896 vertical antenna

background image

VEC-896 Vertical Antenna

Instructions

1

VEC-896 Vertical Antenna

INTRODUCTION


The basic 40 meter quarter wave vertical antenna is 33' tall and requires a reasonably good
ground or counterpoise system to function properly. The usual way to eliminate the requirement
for a complicated and space consuming ground system is to center feed a 1/2 wave (in this
example a 66' tall) antenna.

These problems were solved by combining efficient end loading with a balanced center feedpoint
design. The result is a physically small vertical antenna that gives good performance and does
not require any type of RF ground system.

The reduction in size is accomplished by adding separate loading coils and capacitance hats at
each end of the antenna for the HF bands. The efficient end loading coils are wound on
fiberglass forms. The high quality materials and construction of the HF loading system allows a
maximum power rating of 1500 watts on 40, 20, 15 and 10 meters. The six and two meter bands
are covered with the addition of four quarter wave decoupling stubs on the side of the main
elements.

The power rating of this antenna varies from band to band. The PEP ratings are primarily
determined be the voltage breakdown of the components, while the CW ratings are generally
determined be components heating.

The following chart lists the power rating and the 2:1 VSWR bandwidth of this antenna:

Band Power Bandwidth

CW

SSB

RTTY

40 m

500

1500

700

40 KHz

20 m

750

1500

1250

250 KHz

15 m

1000

1500

1250

700 KHz

10 m

750

1500

1250

1.0 MHz

6 m

300

750

300

2.6 MHz

2 m

200

300

200

7 MHz


The weight and wind load of this antenna is 15 pounds and approximately 2 square feet
respectively.

Warning:

Improper installation and assembly can be hazardous! Read these

instructions thoroughly before attempting to assemble, install or operate this
product! High power transmitting devices produce voltages that can cause
severe burns or other injuries.