Garmin GARMIN gps/vhr system CNX80 User's Manual

Garmin GPS User's Manual - GARMIN gps/vhr system CNX80.
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GARMIN USA, Inc.    1200 East 151st St.,   Olathe, Kansas 66062    913/397.8200   Fax 913/397.8282 

 

 

CNX80 User Newsletter 

Fourth Edition for the CNX80 

5/4/04 

Paul Damschen, CNX80 Certification Manager 

 
In this edition: 
 

1.

  Common Installation Problems with GPS/VHF Systems. 

2.

  GTX 32 and 33 interfaces. 

3.

  Auto SUSP in Holding. 

4.

  Operating on the fringes of WAAS coverage 

5.

  Meggitt Magic Interface 

 

Common Installation Problems with GPS/VHF Systems 
 
This topic is not really specific to the CNX80.  However it bears putting forth some of 
this information as the CNX80 installations we have seen can and have been affected by 
some of these common installation problems.  If you are in the process of installing your 
CNX80, you may wish to discuss these issues with your installer, or if you are a 
distributor, be aware of these types of issues. 
 
In almost all cases, the majority of problems are related to the Radio Frequency (RF) 
signals used by the VHF Nav/Comm and GPS signals from the GPS satellites.  Serial 
data connections between systems typically are less problematic, as they tend to either 
work or not work at all in which case wiring, poor seating of the unit in the tray, or a bent 
or broken pin is usually the cause. 
 

Reuse of Old Coax and Connectors 
If it’s not broken don’t fix it, right?  Most of the time this approach works, but reliability 
of reused coax and connectors tend to be hit and miss.  Old coax and connectors that are 
reused in a retrofit upgrade with new equipment usually result in an acceptable 
installation, but it’s a common point of failure and complaint that we hear. 
 
Coax is not expensive and frayed/chafed coax or marginal crimps on the connectors will 
substantially degrade system performance or drive you crazy with intermittent or 
complete loss of function problems.  If the airplane is open and the coax accessible it is 
far cheaper to replace it than leave what’s been in the airplane for many years and hope 
for the best. 
 

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