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Forum: Marine Electronics

17-02-2016, 06:01

Replies: 43

AIS Fault Message

Views: 14,959

Posted By continuouswave

Re: AIS Fault Message

OK--now we have changed the cable specification for the newly installed cable for the third time.

We began with RG-233, a cable with very much less loss than RG-58.
Next we changed it to RG-213,...

Forum: Marine Electronics

16-02-2016, 10:01

Replies: 43

AIS Fault Message

Views: 14,959

Posted By continuouswave

Re: AIS Fault Message

There is a big difference between RG-233/U (as you first wrote) and RG-213/U.

Which did you actually use?

If RG-213/U, then transmission line loss was reduced compared to RG-58/U, but not...

Forum: Marine Electronics

16-02-2016, 07:27

Replies: 43

AIS Fault Message

Views: 14,959

Posted By continuouswave

Re: AIS Fault Message

My first move would be to actually measure the VSWR on the transmission line at the AIS frequencies

161.975-MHz
162.025-MHz

This is somewhat difficult to accomplish because your typical VHF...

Forum: Marine Electronics

16-02-2016, 00:58

Replies: 43

AIS Fault Message

Views: 14,959

Posted By continuouswave

Re: AIS Fault Message

If the antenna is located atop a mast, I assume the transmission line length is rather long. If the previous transmission line was RG-58/U cable, it was quite lossy. There was probably a loss of more...

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