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-   -   VHF noise / squelch (http://www.sailnet.com/forums/gear-maintenance/90747-vhf-noise-squelch.html)

Greguk 08-09-2012 10:34 PM

VHF noise / squelch
 
Raymarine 55 VHF. Around the same time as I installed an antenna splitter to add an AIS transponder the VHF performance has dropped to nearly useless. Squelch needs to be virtually off to hear anything and even then there is background hiss.
Checked out the splitter and no apparent problems there so am now thinking coincidental antenna problem?
any advice on how one tests a VHF antenna?

ParadiseParrot 08-09-2012 10:57 PM

Re: VHF noise / squelch
 
SWR meter.Dont know if u will find one for marine band.

Swap i out with emergency ant for comparison

sea_hunter 08-10-2012 05:36 AM

Try it without the splitter, you may have the wrong one. Many antenna issue are connector problems. Soldered ones are best, but you need to check them with a meter as it's easy to short them out in the process.

Minnewaska 08-10-2012 06:32 AM

Re: VHF noise / squelch
 
I'm not a radio pro, but I have been counseled by some to not use splitters. When, not if, they fail, you lose both radios.

aa3jy 08-10-2012 07:25 AM

Re: VHF noise / squelch
 
Quote:

Originally Posted by Greguk (Post 907647)
Raymarine 55 VHF. Around the same time as I installed an antenna splitter to add an AIS transponder the VHF performance has dropped to nearly useless. Squelch needs to be virtually off to hear anything and even then there is background hiss.
Checked out the splitter and no apparent problems there so am now thinking coincidental antenna problem?
any advice on how one tests a VHF antenna?

Another problem that wasn't depicted in the video is water egress into the coax cable..


SVAuspicious 08-10-2012 08:21 AM

Re: VHF noise / squelch
 
Splitters are evil.

hellosailor 08-10-2012 02:35 PM

Re: VHF noise / squelch
 
Worked before the splitter, doesn't work after the splitter?

Simplest troubleshooting, uninstall splitter, see if it works again. If you CUT the antenna cable and installed new fittings to accomodate the splitter, it could just be a bad fitting. Crimp or solder, they all have ways to fail.

If you cut the antenna cable and installed two new male fittings? Yes, you'll need to spend two bucks on a female-female fitting to rejoin them. That's a useful thing to have around anyhow.

gus_452000 08-23-2012 10:01 AM

Re: VHF noise / squelch
 
hmmm Splitters....... hate them (my own thoughts) should have 1 input 2 outputs (some have more outputs) the thing is very simple. the more connectors you have, the more chance something can and will go wrong.

For what they cost an SWR meter is a must, if you havent got one, they can be bought for around 30UKP (40 something USD) and are worth 10 times this amount with what they can tell you. For example not only will it tell you if the antenna is good or bad but if the radio is putting out the correct amount of power as well. Now if you get a bad SWR more than 2 to 1, well its on the output side of the SWR meter, but it could be damaged coax cable, or a bad antenna. I have often found that it is usually the coax that has gone bad, sometimes it is the antenna but more often than not the coax has got water logged. It is amazing how fast that stuff can drink water, you wont believe how much of the stuff it will hold and still look like new even though its now damaged beyond use.

So my thoughts are, remove the splitter try the old antenna and coax and see if there both OK (if you have/borrow a SWR meter check with that as well), possibly find theres an issue with a plug or the coax is water logged. If these check out OK, then its either the splitter or one of the connections to the splitter that's at fault. If its the splitter take it back and swap it for a 2nd VHF antenna and have one antenna for the VHF and one for the AIS transponder, much safer way of doing things.

Hope this was some help, my best guess the coax or one of the connections is no good.

good luck


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