DRAKE MN2700 Buku Petunjuk - Halaman 12

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Multiband Antenna:
A doublet antenna 135 feet long, center fed with
open-wire feeders 67 feet long, can be matched
using the accessory balun on 80 through 10
meters. The feeders make a good 160 meter ver-
tical when connected together and to the
BALILW (1:l or
4:l)
terminal of the balun
TO M A T c m m
I
" l w ~ - r + I
1
NETWORK
BALILW
(1:l or 4:l)
*
8010
METER
CONFIGURATION
(POS
3 1 B A L
ON
MN2700)
~
,
-
TO MATCHING
160
METER INVERTED ' L '
(POS 4/UNBAL ON
MN2700)
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Fig.
3-3
Multiband
Antenna
--..
- .
CAUTION
An
antenna
or
a
dummy
load
MUST
be
connected
to
the
MN-2700
before
energiz-
ing
the
transmitter
to
avoid
damage to
the
matching
network
and
the
transmib
ter.
Initial
tuning
must
be
done
with
low
transmitter
power.
Final
small
ad-
justments
may
be
made
a t
full
power.
Do
not
change
any
switch
positions
under
high
power.
Preset
the
operating
controls
as
follows:
BAND
Switch:
To
desired
band
Resistive
Tuning:
To
5
Reactive
Tuning:
To
5
Resistive
Range:
To
o
-
10
Reactive
Range:
To
o
-
10
VSWR
Set
Control:
Fully
Counterclockwise
Meter
Switches:
To
VSWR
READ
Energize
the
transmitter,
apply
low
power
to
the
matching
network,
adjust
the
transmitter
plate
tuning
to
resonance,
and
adjust
loading
to
minimum
(max.
capacity).
The
VSWR
meter
should
read
upscale.
Vary
the
RESISTIVE
tuning
until
the
VSWR
dips.
If
there
is
not
enough
tuning
range
to
dip
the
VSWR,
switch
in
or
out
theresistive
range
capacitor
as
needed
to
dip
the
VSWR.
Then
turn
the