SPM-32A ... SPM-36A 1.1 About these instruments
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1FOREWORD
1.1 About these instruments
The SPM-32A, 33A, 36A series of Selective Level Meters
are designed as in-service test sets for CF communications
systems using up to 120, 300 or 600 channels respectively.
The SPM-34A Selective Level Meter is particularly suitable
for making level measurements on instruments and
equipment used in telex and telecontrol systems as well as
in telephony. Four bandwidths are specially tailored for
making in-service measurements on ITU-T FM VFT
channels with transmission rates of 50, 100, 200 and 600
Baud.
The SPM-35A Selective Level Meter is suitable for analyzing
a mixture of frequencies and for measurements on ARI and
RDS systems, as well as telecontrol and ITU-T FM VFT
systems operating at 50, 100 and 200 Baud. The minimum
bandwidth of 5 Hz is useful for measuring discrete signals
starting at 50 Hz (e.g. subaudio tones) and composite
signals, such as spectral components of analog (ARI) and
digital (RDS) traffic radio signals in the multiplex baseband of
UHF transmitters. These signals are located close to the 57
kHz auxiliary carrier. The 25 Hz bandwidth is suitable for
easurement of pilots and residual carriers. Special
bandwidths for keyed signals make the instrument optimal
for in-service measurements on FM-VFt and remote control
systems.
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