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input. A correct indication is obtained only if the ambient
interference does not affect the instrument and the test for
leakage.
3.2.9.15.4.5 Antenna Induced Microvolts:
Antenna induced microvolts is that voltage which exists across
the open-circuited antenna terminals.
Impulsive Interference:
3.2.9.15.4.6
For the purposes of this specification, all broadband noise,
including random noise and pulsed CW is considered to be
impulsive interference.
3.2.9.15.4.7 Octave:
An octave is a frequency ratio of 1 to 2, i.e., from 1 to 2 mc,
to 2 to 4 mc, 500 to 1,000 mc, etc.
3.2.9.15.4.8 Microvolt per mc:
The nearest approach to a standard unit of measurement of broad-
band radio interference is in terms of microvolt per megacycle.
Interference intensity in microvolt per megacycle is equal to
the number of root mean square sine wave microvolt (unmodulated)
applied to the input of the measuring circuit at its center
frequency that will result in detector peak response in the
circuit equal to that resulting from the interference pulse being
measured, divided by the impulse bandwidth of the circuit in
megacycles.
3.2.9.15.4.9 Impulse Bandwidth:
The impulse noise bandwidth of the interference measuring instru-
ment should be used in calculation involving broadband noise.
Effective (random) bandwidth should not be used. The impulse
noise bandwidth of a receiver can be readily obtained by use of
an impulse generator of known output in microvolts/kc. The peak
response indication of the instrument in input microvolt
divided by the output of the impulse generator in microvolts/kc
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