168
BARRETT 4050 HF SDR TRANSCEIVER - OPERATING AND INSTALLATION MANUAL
Hub Detail
+HOLFDOGLSROHVDUHPDQXIDFWXUHGWRVSHFLÀFIUHTXHQFLHVEXWPD\UHTXLUHÀQH
tuning after installation. To enable this, the dipole elements have an adjustable
OHQJWKWLSWRDOORZÀQHWXQLQJIRURSWLPXP96:5GXULQJLQVWDOODWLRQ,QVWDOO
WKHDQWHQQDLQLWVÀQDOSRVLWLRQDQGFKHFNWKH96:5RQHDFKRIWKHIUHTXHQ
-
cies that the antenna was manufactured for. Should the VSWR be greater than
1.5:1 the antenna will require adjustment. If a tunable transmitter is available,
determine on each frequency the helical dipole was manufactured for, at what
frequency the best VSWR is obtained. If this occurs at a frequency below the
required frequency then the tips will have to be shortened on the pair of ele-
ments corresponding to that frequency. If the best VSWR occurs on a frequency
higher than the required frequency then the tips will have to be lengthened.
Adjust both ends by an equal amount and repeat the above sequence until
an optimum VSWR is obtained. If a tunable transmitter is not available, use a
method of trial and error to adjust the length of the tips, a little at a time, until
an optimum VSWR is obtained. Remember always adjust each pair of elements
by the same amount at each adjustment.
Содержание 4050 HF SDR
Страница 218: ......