4-42
4.2 Operation and features SPM-32A ... SPM-36A
1.74 kHz bandwidth
This filter corresponds to the 3.1 kHz channel filter, but has a
smaller effective noise bandwidth. It is intended for
measuring weighted noise. Its noise bandwidth is the same
as that of the weighting filter specified by the ITU-T-O.41
(see figure 4-15, page 4-42).
3.1 kHz bandwidth
This is the same bandwidth as a telephone channel. Using
this bandwidth you can measure the power and unweighted
noise carried by single telephone channels.
Warning: The 3.1 kHz and 1.74 kHz bandwidths should
only be used when the receive frequency is
greater than 2 kHz.
Fig. 4-15 Typical receiver selectivity for bandwidths of 1.74 kHz
and 3.1 kHz
∆F
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