169
BARRETT 4050 HF SDR TRANSCEIVER - OPERATING AND INSTALLATION MANUAL
915 Wire Dipole
(Barrett P/N BC91500)
Single frequency wire dipole antennas, spot-tuned to the required operating
IUHTXHQF\VDUHWKHPRVWHIÀFLHQWDQWHQQDVI)EDVHVWDWLRQV7KH\
are simple to install and have a relatively narrow bandwidth.
Dipole antennas should be mounted at least ½ wavelength from the ground.
Dipoles may be mounted either between two towers or in an inverted “V”
FRQÀJXUDWLRQUHTXLUHVRQO\RQHPDVW$VDJXLGHZKHQLQVWDOOLQJWKHPDVWV
the length between insulators of a half wave wire dipole is 142/(frequency of
dipole in MHz) metres. To this an allowance should be made for extra insulators
and halyards.
For example, a 3.7 MHz dipole - length between the insulators = 142/3.7
=38.38 metres.
:LUHGLSROHVVXSSOLHGE\%DUUHWWDUHSUHFXWWRDVSHFLÀHGIUHTXHQF\EXWKDYH
DGMXVWDEOHHQGV7KHVHDGMXVWDEOHHQGVDOORZÀQHWXQLQJIRURSWLPXP96:5
GXULQJLQVWDOODWLRQ7RÀQHWXQHDGLSROHLQVWDOOWKHDQWHQQDLQLWVÀQDOSRVL
-
tion and check the antenna VSWR. Should the VSWR be greater than 5:1 the
antenna will require adjustment.
Содержание 4050 HF SDR
Страница 218: ......