Series 04 Ku-Band TVRO Antenna

Series 04 Ku-Band TVRO Antenna
Troubleshooting and Maintenance
4. In the “Response”
window verify proper
GPS position to within 1
nautical mile of your
current position.
The Latitude & Longitude
position of the GPS will be
displayed in the following
format:
“@ LAT,N,LON,E,A”
Where LAT and LON are in
degrees and minutes, LAT will be
followed by N or S (North or
South), LON will be followed by
E or W (East or West), then a
status character and finally a
checksum character.
Furuno default value is in Japan
at 34.4N 135.2E
(@3444,N,13521,E,,_).
After acquiring a good fix at Sea
Tel the string is
@3800,N,12202,W,A^
for our 38N 122W Latitude and
Longitude position.
The status character tells you
the status of the GPS.
“,” (Comma) = GPS has NOT
acquired a proper fix,
“N” = GPS fix is NOT valid
“A” = GPS has acquired a valid
fix.
7.4. Maintenance
Below are some procedures for removing/replacing some of the major components on the antenna.
7.4.1. Replacing or Changing LNBs
Series 04 antenna can be easily fitted with a variety of LNB assemblies. The feed is capable of
receiving linear or circular polarization signals, however, the LNB must match the desired satellite
polarization mode. Below are the instructions to install and align a replacement LNB, or switch to a
different LNB. . When a Linear LNB is installed POL OFFSET parameter must be optimized.
NOTE: Linear polarization skew is intentionally REVERSED from actual received
satellite polarization by the ½ wave length phase card (refer to basic system
information). Therefore, to adjust polarization UP the LNB (as viewed from the back
side of the reflector) must rotate CCW and to adjust polarity DOWN the LNB must
rotate CW.
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