Open Half-Wave
Lines
Couple at the
center of the line as shown in
Figure 3-10. When measuring
coaxial
lines, short the
lines
at
one end and measure as
for the quarter-wave shorted line
at the
calculated
1/2
frequency.
Resonant frequency is then multiplied
by
2 to
determine the correct length
of
the line after you remove the
shorting line.
Standing
Waves
Maintain a
uniform coupling as
you move the Dip
Meter along
the feed-line
by
keeping the
coil form
against the line. This is
possible as the coil
windings are
shielded from direct
contact by the
coil coating. A
"flat" line is
determined
by
the lack of
meter fluctuation as you
move the
coil along the
line. Do not
overload the dip
meter, it is highly
sensitive to
small changes due to
its internal
amplifier.
HALF-WAVE OPEN
LINE (SHORTED)
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