2.2.3 SVSWR site validation - standard test procedure (TECH 103)
b) Verify that the received signal displayed will be at least 20 dB above
the ambient and above the
measuring receiver or spectrum analyzer displayed noise across the entire
frequency range to be
measured. If not, it may be necessary to use different equipment (antennas,
cables, signal generator,
preamplifier) and/or use partial frequency ranges as appropriate to maintain
a level of 20 dB above the
displayed noise floor.