Diamond Antenna W-735 작동 지침 - 페이지 3

{카테고리_이름} Diamond Antenna W-735에 대한 작동 지침을 온라인으로 검색하거나 PDF를 다운로드하세요. Diamond Antenna W-735 4 페이지. Hf multi-band wire dipole (trap dipole) antennas w series
Diamond Antenna W-735에 대해서도 마찬가지입니다: 작동 지침 (4 페이지)

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Adjustment

1. Prepare a VSWR power meter for applicable frequencies and RF

power, and set the meter as shown in the following figure. Practice

test transmission for the adjustment as short time and least RF

power as possible. (Maximum power rating in canstant wave (CW)

mode is approximately 1/3 of one in SSB mode.)

r T

ansc

eiv

Start adjustment from the highest operating frequency downward

by cutting adjustment element, both sides in same length, to de-

sired resonant frequency, least VSWR return at the frequency.

Since cutting the element in excess may skip desired frequency

and result in losing resonant frequency, cut the element little by lit-

tle.

* If VSWR cannot be better

If VSWR can not be lowered even though resonant frequency came

to be desired frequency by cutting the element, it is most likely that

the antenna is being effected by earth or near by nuildings. Then it

is advised to change antenna height or antenna location. Bending

the element downward from the balun can also change VSWR.

Adjustment element cutting chart

*Cutting adjustment element will raise resonant frequency.

*The following chart shows resonant frequency change per 1cm

element cut

Frequency

80m(3.5MHz)

40m(7MHz)

20m(14MHz)

15m(MHz)

10m(28MHz)

t n

enn

VSWR po

er met

djustmen

t elemen

W-8010

W-735

4KHZ

4KHz

7KHz

45KHz

40KHz

70KHz

Fig. A

Fig. B

T T w

o poin

t suppor

Fig. C

v n

(

> 120°

Fig. D

Fig. E