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Intermodulation -
Passive Intermodulation (PIM) is a form of signal distortion that occurs
whenever signals at two or more frequencies conduct simultaneously in a
passive device (electromechanical switch) which contains some non-linear
response. This interference phenonomenon is attributable to many sources
such as dissimilar metals, dirty interconnects, or other anodic effects.
PIM us of particular concern whenever:
-Two
or more transmitter channels share a common antenna.
-Transmitter
signal levels are high.
-Receiver
sensitivity is high.
-Transmitters
and receivers share a common antenna.
-Two
or more base station tranceivers are at a single site.
Charter Engineering, Inc. recognizes the need to
achieve low PIM levels and offers specially designed
electromechanical switches to meet low intermodulation requirements.
PIM measurements will vary depending upon carrier
frequencies, power level, and PIM frequency. Charter Engineering, Inc. has
certified the product line to meet the following criteria:
| 3rd
order Intermodulation @ approximately 43.0 dBm |
| |
Carrier
Frequency 1 |
Carrier
Frequency 2 |
PIM
Frequency |
PIM
level (dBc) |
| Low
IM |
869
MHz |
891
MHz |
847
MHz |
-110
dBc min. |
| Ultra
Low IM |
869
MHz |
891
MHz |
847
MHz |
-130
dBc min. |
For further details, please contact Charter Engineering @ sales@ceiswitches.com
or (727)
525-1025.
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