A-007-03: Antenna feed arrangements - tee, gamma, stub
A-007-03-01:
What term describes a method used to match a high-impedance transmission line to a lower impedance antenna by connecting the line to the driven element in two places, spaced a fraction of a wavelength on each side of the driven element centre?
The T match
The gamma match
The omega match
The stub match
A-007-03-02:
What term describes an unbalanced feed system in which the driven element of an antenna is fed both at the centre and a fraction of a wavelength to one side of centre?
The gamma match
The omega match
The stub match
The T match
A-007-03-03:
What term describes a method of antenna impedance matching that uses a short section of transmission line connected to the antenna feed line near the antenna and perpendicular to the feed line?
The stub match
The omega match
The delta match
The gamma match
A-007-03-04:
What would be the physical length of a typical coaxial stub that is electrically one quarter wavelength long at 14.1 MHz? (Assume a velocity factor of 0.66)
3.51 metres (11.5 feet)
20 metres (65.6 feet)
2.33 metres (7.64 feet)
0.25 metre (0.82 foot)
A-007-03-05:
The driven element of a Yagi antenna is connected to a coaxial transmission line. The coax braid is connected to the centre of the driven element and the centre conductor is connected to a variable capacitor in series with an adjustable mechanical arrangement on one side of the driven element. The type of matching is:
gamma match
lambda match
"T" match
zeta match
A-007-03-06:
A quarter-wave stub, for use at 15 MHz, is made from a coaxial cable having a velocity factor of 0.8. Its physical length will be:
4 m (13.1 ft)
12 m (39.4 ft)
8 m (26.2 ft)
7.5 m (24.6 ft)
A-007-03-07:
The matching of a driven element with a single adjustable mechanical and capacitive arrangement is descriptive of:
a "gamma" match
a "T" match
an "omega" match
a "Y" match
A-007-03-08:
A Yagi antenna uses a gamma match. The coaxial braid connects to:
the centre of the driven element
the variable capacitor
the adjustable gamma rod
the centre of the reflector
A-007-03-09:
A Yagi antenna uses a gamma match. The centre of the driven element connects to:
the coaxial line braid
the coaxial line centre conductor
the adjustable gamma rod
a variable capacitor
A-007-03-10:
A Yagi antenna uses a gamma match. The adjustable gamma rod connects to:
the variable capacitor
the coaxial line centre conductor
an adjustable point on the reflector
the centre of the driven element
A-007-03-11:
A Yagi antenna uses a gamma match. The variable capacitor connects to the:
adjustable gamma rod
an adjustable point on the director
center of the driven element
coaxial line braid
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