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+--- Thread: [DG] [DG] AIS 700 - AIS Antenna problem (/showthread.php?tid=6683)
[DG] AIS 700 - AIS Antenna problem - nachothecat - 09-27-18 05:13 AM
Hello,
I keep getting an error with my AIS 700. on the diagnostic page of the proAIS2 software i keep seeing a red X by the AIS antenna list. I'm wondering what this means and if there are other diagnostic tools to help me solve the problem. (though i realize its prob an issue with my VHF antenna)
RE: [DG] AIS 700 - AIS Antenna problem - Derek - Raymarine - Moderator - 09-27-18 07:47 AM
Hi nachothecat
Thankyou for your enquiry.
The key diagnostics to check in PRO AIS2 is the VSWR reading . . ideally it should be between 1.0 :1 and 2.0 : 1, VSWR is a ratio of how efficient the antenna (and cable) is, the higher the ratio the poorer the performance.
check out this FAQ found here for more information, ( it refers to AIS 650, but the antenna issues will be the same)
So if the VSWR is high, then either the antenna is at fault or the cable/ connections to the antenna. Please also bear in mind that some antennae are not suitable for AIS transmissions, most antenna are specified for a range of frequency and AIS operates circa 162MHz, this needs to be in the middle of the range for the antenna selected.
regards
Derek
RE: [DG] AIS 700 - AIS Antenna problem - Oregoncme - 09-29-18 06:28 PM
Make sure the antenna, if on a ratchet mount, is not laying down horizontal. High VSWR can result and give you a bad antenna indication.
RE: [DG] AIS 700 - AIS Antenna problem - Derek - Raymarine - Moderator - 10-01-18 09:17 AM
Thankyou - also good advice
Thanks
Derek