Palstar COMMANDER VHF-144, Руководство пользователя

Страница: 10 / 24

10
OPERATING HINTS
The Commander VHF-144 TUNE control is a high "Q" piston-type tuning capacitor with a 6:1
ratio vernier reduction drive. This control requires about 15 revolutions to tune the unit from
144 to 148 MHz.
Unless you have specified another band segment, the unit is factory tuned at 144.200, the na-
tional SSB calling frequency. If you use the Commander VHF-144 mainly for CW and SSB,
and after having tuned the unit to your antenna, you will be able to QSY up or down the CW/
SSB band segment without making any tuning adjustments. Unless someone changes these ad-
justments, it will not be necessary to retune the amplifier each time you operate it. Just turn the
unit on, wait for the green light and begin transmitting.
If you decide later to operate in the FM portion of the band, it is best done by tracking up the
band about 500 KHz at a time. To do this, key the exciter with low drive (5 watts or less), re-
tune INPUT for a peak in plate current (Ip), and readjust TUNE control for maximum output,
repeating this procedure as you move up the band. This is also useful if you happen to forget
where you left it tuned.
TYPICAL OPERATING CONDITIONS
DRIVE GRID CURENT PLATE CURENT POWER OUTPUT
12.5 Watts 15 ma 400 ma 450 Watts
18.5 Watts 25 ma 500 ma 650 Watts
30 Watts 35 ma 600 ma 1000 Watts