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Q.
Q.
Q.
Q. Even with a known 50
Even with a known 50
Even with a known 50
Even with a known 50----Ohm impedance, the SWR does not indicate a low value.
Ohm impedance, the SWR does not indicate a low value.
Ohm impedance, the SWR does not indicate a low value.
Ohm impedance, the SWR does not indicate a low value.
A. The impedance that you are viewing is an absolute value that also contains a reactance. It is possible
to have the meter show 50 Ohms of impedance without a 1:1 SWR.
Try to get the reactance as close to zero as possible; in this instance, with a total impedance of 50
Ohms and nearly zero reactance, the SWR will be 1:1 (ideal situation).
In this MkII version, a reactance display has been added. Because it shows the absolute value of reactance (no “+” or
“- ”), you cannot initially tell if the reactance is capacitive or inductive. Generally, if the impedance is capacitive ( - ),
then making the antenna shorter (in the case of a dipole or Yagi driven element) will cause the reactance to increase. If
the impedance is inductive ( + ), making the antenna longer will cause the reactance to increase.
Q.
Q.
Q.
Q. At what point do I want to use a cable for attachment to the antenna?
At what point do I want to use a cable for attachment to the antenna?
At what point do I want to use a cable for attachment to the antenna?
At what point do I want to use a cable for attachment to the antenna?
A.To get the most accurate reading of the impedance, the meter should be either immediately at the feedpoint for the
antenna (often impossible) or connected via an integer multiple of a half wavelength of cable at the frequency being
measured. However, feedline loss may affect the results even in this case, so you will not see the antenna performance
alone, but rather the a cable system performance.
When computing a half-wavelength cable, the velocity factor of the cable must be included. For example,
the velocity factor of RG-213 type coax is typically 67%. So for 14 MHz this is 492 x 12 (for inches) =
5904 divided by 14 (MHz) x 0.67 = 421.71 inches (including velocity factor).
Depending on the cable diameter and attendant losses, the use of cable lengths in excess of 30m (about 100’) may yield
inaccurate readings, due to the very low power of this unit.
Q.Is it possible to connect to the “M” (“UHF) and “N” (Type N) jacks simultaneously?
Q.Is it possible to connect to the “M” (“UHF) and “N” (Type N) jacks simultaneously?
Q.Is it possible to connect to the “M” (“UHF) and “N” (Type N) jacks simultaneously?
Q.Is it possible to connect to the “M” (“UHF) and “N” (Type N) jacks simultaneously?
A. Because the jacks are automatically switched, according to the frequency in use, there is no way that
both jacks may be used simultaneously (the opposite connecter cannot be used in case of an incompatibility).
◆
◆
◆
◆
Product Specifications
Product Specifications
Product Specifications
Product Specifications
Frequency Range
1.8
–
500 MHz in 35 range segments
RF Output Level
0 dBm (1 mW)
Measured SWR Range
Analog Meter: 1.0
–
6.0; LCD:1.0
–
9.9
Impedance Range
12.5
–
300 Ohms (Analog and LCD)
Resistance Range
10
–
500 Ohms
Reactance Range
0
–
500 Ohms (Absolute Value)
RF Connectors
“
M
”
(
“
UHF/SO-239
”
) for HF/VHF,
“
N
”
for UHF
Operating Temp.
0
º
- 40
º
C (32
º
- 104
º
F)
Power Sources
6 x Alkaline or NiMH Rechargeable Cells
External Power: +8 to +16V DC
Current Consumption
185 mA or less
Charging Time
15 hours at 12
–
14V DC (trickle charge)
Dimensions
89 (W) x 196 (H) x 70 (H) mm (incl. knobs/jacks)
Weight
800g (unit only), 940g (w/batteries)
Supplied Accessory
External DC Cable (Center pin +)
Notes on Handling
Notes on Handling
Notes on Handling
Notes on Handling
●This unit is fragile: do not drop or subject it to a strong shock.
This unit is fragile: do not drop or subject it to a strong shock.
This unit is fragile: do not drop or subject it to a strong shock.
This unit is fragile: do not drop or subject it to a strong shock.
Physical damage and/or malfunction may occur if unit is dropped.
●Do not use in very dusty or damp places,
Do not use in very dusty or damp places,
Do not use in very dusty or damp places,
Do not use in very dusty or damp places, or outside in the rain.
or outside in the rain.
or outside in the rain.
or outside in the rain.
This unit is not waterproof nor dustproof, so damage can occur.
●Please do not disassemble or modify this unit.
Please do not disassemble or modify this unit.
Please do not disassemble or modify this unit.
Please do not disassemble or modify this unit.
To do so may present danger due to electrical shock; product failure or failure
to meet specifications may occur if modified。
●Please use only at a temperature between 0
Please use only at a temperature between 0
Please use only at a temperature between 0
Please use only at a temperature between 0
º
and +40
and +40
and +40
and +40
º
C (+32
C (+32
C (+32
C (+32
º
to +104
to +104
to +104
to +104
º
F).
F).
F).
F).
The Liquid Crystal Display (LCD) may malfunction at low temperatures.
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