SWR-584C Instruction Manual
HF/VHF/220MHz SWR Analyzer
16
[ ] Tune the
VFO
higher
in frequency to find the next
X=0
null (or close as possible to 0).
[ ] Press
Gate
to enter second frequency. Display will show:
[ ] Multiply
DTF
x
Velocity Factor
of the cable (
Vf)
to get the
physical
distance in feet.
(64.0 x .66 = 42.24)
The cable length (or the distance to a "fault" in a longer cable) is 42.24 feet, or 42' 3".
5.6 Resonance Mode:
Resonance mode works exactly the same as
R&X
in the
Basic Menu
,
except the analog
Impedance Meter
displays
Reactance
rather than
Impedance Magnitude
.
This change makes it easier to spot nulls and pinpoint the frequencies where
Resonance
occurs.
Resonance is defined as the frequency where
Capacitive Reactance
(
Xc
) and
Inductive Reactance
(
X
L)
cancel out and equal zero (
X=0
).
To access
Resonance Mode:
[ ] Connect the DUT to the
Antenna
jack
[ ] Enter
Advanced
Mode
[ ] Press Mode
three times
to access
Resonance Mode
and wait for the working screen:
[ ] Watching the
Impedance
meter, tune for a null (
X=0
or as close as possible).
Ohms
40 50 70 100 400
0 10 20
Accuracy Note:
When measured thought feedline,
the X=0 reading many not occur on the
frequency where the antenna is actually resonant.
As with any reactance measurement, the
analyzer
Calibration Plane
must be positioned close to the DUT (or to 0-degrees of phase
rotation) as possible.
3.8944
MHz
1st
DTF
X=0
Dist. to fault
64.0 ft x Vf
3.8944MHz
2nd
DTF X=0
11.519 MHz
2nd
DTF
X=2
Resonance Mode
tune for X=0
14.150 MHz 1.5
R=54 X=4 SWR
14.168 MHz 1.5
R=54 X=0 SWR
