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The bandwidth (BW) control is identical for all three frequency
bands. The BW control determines the width (or the Q) the
frequency curve around the selected center frequency is to have.
The parameter is measured as a quotient Q of the following
formula:
Q = (f
o
f
u
)/ (f
o
-f
u
)
f
o
is the upper corner frequency and f
u
the lower corner
frequency measured at the -3 dB point of the frequency curves.
Narrow bandwidth corresponds with a high Q and vice versa.
The BW is set to ‘high Q’ (Q5) when turned fully counter clock-
wise. The influenced range covers approximately 0.2 octaves.
Turning the BW control fully clockwise selects ‘low Q’ values
(Q0.5) covering approximately 2.5 octaves.
The Q
URE utilizes the proportional-Q principle, also known as
‘variable Q’. The amplitude varies depending on the Q setting.
Diagram 7:
All 11 steps of the BW control
from smallest Q (Q5) to broa-
dest Q (Q0,5) are shown.
The center frequency is1kHz.
The diagram is valid for both
LF and HF band.
Diagram 8:
As diagram 7,but for the
non-reciprocal response
of the MF band.
BW (Bandwidth)
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