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5.3.2. Transformers
RigExpert analyzers can also be used for checking RF transformers. Connect a 50 Ohm
resistor to the secondary coil (for 1:1 transformers) and use SWR graph, R,X graph or
Smith/polar chart modes to check the frequency response of the transformer. Similarly,
use resistors with other values for non-1:1 transformers.
5.3.3. Traps
A
trap is usually a resonant L-C network used in multi-band antennas. By using a
simple one-turn wire coil a resonant frequency of a trap may be measured.
Example:
A coaxial trap constructed of 5 turns of TV cable (coil diameter is 6 сm) was
measured:
A one-turn coil (about 10 cm in diameter) connected to the analyzer was placed,
co-axially, a few centimeters away from the measured trap. The SWR graph
shows a visible dip near 17.4 MHz, which is a resonant frequency of the trap.
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