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| I have a marine radio mounted under the drivers side console in my boat and whenever I key the mic at 25 watts the CD player in the dash automatically comes on and I also get feedback through the CD players speakers. The in dash CD player has a digital clock in it that is on all the time, so we rigged that radio to a seperate switch so it doesn't drain the battery. When the switch is turned off I don't get the feedback problems or the radio doesn't come on because the power to it has been cut off. But now I can receive well on the marine radio, but it appears that it doesn't transmit well. I can receive from other boats real clear, that are in the area but they are not receiving my transmissions clear at all.
Do I need to shield this antenna? The antenna for the marine radio is located at the very back end of the boat, about 8' from the actual radio. | |
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Location: Green Bay, WI | It sounds like an Radio Frequency Interference (RFI) issue. Check this out for starters:
http://en.wikipedia.org/wiki/Electromagnetic_interference
I wonder if the cables for your VHF are shielded or not? Is it a high-quality unit?
I remember a bit about this from my HAM radio days and it sounds to me like you might need a band-pass filter. These basically allow the desired frequencies of the VHF radio to pass, but not those outside of the desired range (band). Here is some more reading:
http://www.patentstorm.us/patents/6469590-description.html
Maybe someone else will chime in with some thoughts, as I am not as well-versed in this stuff as I once was. But I think it's a good place to start. You might also go the Hull Truth forum and search the forum archives. That's a great source of information.
http://www.thehulltruth.com
Good luck!
TB
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marine radio antenna