Link Quality
The Link Quality (LQ) is a numeric value that provides a real-time metric on the quality of communication between the
Radio Transceiver and the Radio Pack. The LQ serves as a diagnostic tool for proper system operation and
troubleshooting Radio Packs.
l
The LQ value represents the number of successful audio packets of the last 100 transmissions—99 being the
most, 0 being the least.
l
With CrewCom, the receiving LQ signal is reported for both the Radio Transceiver and Radio Pack. The Radio
Pack’s on-screen LQ indicator with the box around it is the Transceiver’s LQ from the RP. If this LQ is lower
than you typically experience in normal operation, then it is an indication that you may have an issue related to
interference, the transceiver, or a cable connection. If only the RP’s LQ is low, it could be an indication that you
may have an issue related to interference or the Radio Pack.
l
What should the LQ value be during operation? — The LQ will not remain at an exact value during system
operation. Depending on what degree of outside interference or attenuation (blocking) is present, the LQ will
fluctuate during normal operation. Fluctuations in LQ can and will span a wide range of values. The lower the
LQ, the poorer the audio quality will be during operation. During start-up, within adequate range and no
outside influences present, the LQ should display “99” which is the highest LQ value a Radio Pack or Radio
Transceiver can have.
l
What if the LQ on a single Radio Pack is below “99” at start-up? — This depends on where the Radio Pack is
located at start-up, but if the other Radio Packs on the same Radio Transceiver are at “99” this is a good
indication that an isolated radio issue exists within that Radio Pack. If the LQ value has dropped considerably
lower or if that unit is experiencing poor audio quality, it may require service.
Figure 24
RP Primary Screen LQ Indicator
Operation - 50
Summary of Contents for Crewcom CCU-22
Page 1: ...Control Unit OPERATING MANUAL...
Page 2: ...ii...
