Nortel Meridian Companion Reference Manual page 100

Page 94 of 102 Appendix C: Fading
553-3601-106 Standard 2.00 September 1996
Figure 38 : Constructive and destructive signal patterns
A constructive pattern raises the signal strength above average. A destructive
pattern lowers the signal strength below average. The distance between a
constructive and a destructive pattern spans only a quarter wave length of the
signal. For frequencies around 900 MHz, a quarter wave length is 3 to 3
(8 to 9 cm). For frequencies at 1.9 GHz, a quarter wave length is only 1
(4 cm).
Walking briskly when taking measurements minimizes the effects of fading
and gives a more accurate average signal strength.
A quick audio check that indicates an acceptable level of service in a particular
area does not necessarily mean that the signal quality will consistently remain
at that level. Because of fading, the audio quality in any area can change from
moment to moment.
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