Diamond Antenna SX-200 Notice d'utilisation - Page 3
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Measure SWR
1. Set the FUNCTION switch to the CAL position.
2. Turn CAL knob counterclockwise fully to the MIN position.
3. Set the radio equipment on transmission and turn CAL knob
clockwise until the meter indicates the " " position
4. With the equipment kept on transmission, set the FUNCTION switch
to the SWR position, the indicator indicates SWR of the antenna.
Note that there are two scales H and L for SWR reading. If
transmitting RF power is less than 5W then read L position, if the
power is more than 5W then read H position.
* Relationship between reflected RF power and SWR is as follows.
SWR
1.0
1.1
Reflected
0
0.22
RF power (%)
5. Calculation of SWR value is as follows;
√
√
Pf +
Pr
SWR =
√
√
Pf —
Pr
Where
Pf = forward RF power
Pr = reflected RF power
Note
If SWR reading and calculated SWR value differs considerably,
calculated SWR value is more accurate due to the frequency response
of pickup diode used in the directional coupler section.
If SWR is too high
If SWR of the antenna is too high, see if antenna is correctly assembled
and soldered or coaxial cable and connector are correctly assembled
and soldered. Installation location of the antenna, surrounding buildings
and so on, can also be a cause of high SWR value.
1.2
1.5
2.0
2.5
0.8
4.0 11.1
18.4
Technical Specification
Frequency range
Power measurement range
Power range
Accuracy of full scale
3.0
Minimum power
at SWR measurement
25.0
SWR measurement range
Insertion loss
Impedance
Connectors
Dimensions
Weight
Accessories
RS Components shall not be liable for any liability or loss of any nature (howsoever
caused and whether or not due to RS Components' negligence) which may result
from the use of any information provided in RS technical literature.
V10966
1.8—200MHz
0—200W
(intermittent measurement)
5W / 20W / 200W
5W RANGE ±5%
20W RANGE ± 7.5%
200W RANGE ±5%
Add 15% of full scale at 160 to
200MHz
1W
1.0—
0.15dB maximum
1.8—3.5MHz and
150—200MHz 0.2dB maximum
50 ohms
UHF female
155 x 63 x 103 x mm (W / H / D)
510g
Operation instructions
DC power cable
3