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Thread: VHF Problems

  1. #1
    Join Date
    Jun 2006
    Location
    Firth of Clyde / West Coast Scotland
    Posts
    295

    Default VHF Problems

    Hi all

    Ive an issue with my Icom M411 VHF (approx 10 years old) which appears to have problems with transmission.

    Of course it could be the antenna (approx 2m fibreglass whip aerial mounted on the roof of a hardtop 30fter).

    Im going to have a close look at the cabling / connection to the VHF, but do you have any other advice on resolving? Any know issues with the M411 that could be causing the issue? Any thoughts on a replacement should I have no luck resolving?

  2. #2
    Join Date
    Feb 2008
    Location
    Farndon
    Posts
    2,852

    Default Re: VHF Problems

    Is it not transmitting at all or just poor range?

  3. #3
    Join Date
    Dec 2005
    Location
    Live London
    Posts
    3,625

    Default Re: VHF Problems

    Start with basics. Antenna and power

    My boat is 24v. 12v dropped was on way out ( failed 10 min later) and the radio would not transmit due to low power. Then it went dead which made diagnosis simple !

  4. #4
    Join Date
    Jun 2006
    Location
    Firth of Clyde / West Coast Scotland
    Posts
    295

    Default Re: VHF Problems

    Quote Originally Posted by MartynG View Post
    Is it not transmitting at all or just poor range?
    Poor range appears to be the problem.

  5. #5
    Join Date
    Aug 2018
    Posts
    11

    Default Re: VHF Problems

    Morning Kenny, if it's poor range, then could be the cabling between radio and antennae is damaged or poorly shielded? Another thing it could be is damaged antennae? I had a problem on my boat whereby I had fitted LED lights to the radar arch which when turned on would cause RF interference with the radio meaning poor transmissions and recieving. Have you perhaps fitted LEDs recently?

  6. #6
    Join Date
    Jun 2013
    Posts
    3,256

    Default Re: VHF Problems

    Quote Originally Posted by kennyh View Post
    Any thoughts on a replacement should I have no luck resolving?
    Just to answer that specific question. Standard Horizon all day long. Better radios IMHO, better value and excellent support if needed.
    If found in the Brexit forum, please return to the real world.

  7. #7
    Join Date
    Jan 2008
    Posts
    73

    Default Re: VHF Problems

    Quote Originally Posted by kennyh View Post
    Poor range appears to be the problem.
    Is it receiving distant vessels?
    Older Icoms like yours had an issue with the receive IF Filter failing.
    You could transmit OK but would struggle to receive anything unless moored alongside if you had squelch up.
    Turning off the squelch will usually allow you to receive vessels up to a few hundred yards away but with 'hiss' in the received audio from weak signal.
    Regards, Stephen

  8. #8
    Join Date
    Jul 2018
    Location
    Bewdley, Worcs
    Posts
    375

    Default Re: VHF Problems

    Either:

    get a suitably qualified electronics wallah to look at it

    or

    buy a VHF power meter, then you can at least see what is going up the pipe and how much is coming back down.

    Without a powermeter, it is like trying to fix electrics without a multimeter.

  9. #9
    Join Date
    Jun 2006
    Location
    Firth of Clyde / West Coast Scotland
    Posts
    295

    Default Re: VHF Problems

    Thanks all

    All appears to be working now. I stripped and cleaned the antenna connection at the set and that seems to have fixed it.

  10. #10
    Join Date
    Nov 2001
    Location
    Medway
    Posts
    19,644

    Default Re: VHF Problems

    99% of radio problems involve electric not getting on very well with water.
    Poor transmission usually 13.8V not getting to radio. Check fuse and fuse holders first.Then power connection on rear of radio.Any corrosion will increase resistance. Simply pulling fuses/ connections and putting them back in will clean surfaces, squirt of switch cleaner (NOT WD40) will delay future problems.
    Remove pl 259 and check for gunge.Water will get into aerial cable RG58 and can travel amazing distances via Capillary action. Normally a bit of green gunge at plug/socket, in extreme cases copper braid will have dissolved in to black mush.
    As for Standard Horizon,you will find them popular on boats where saving money is considered a priority, probably not many in the wheel houses of folks who earn their living on the water.
    As for support. ICOM are the only company who can/will actually repair a 10 year old radio sometimes FOC as many on here know.
    They have an actual repair workshop( with actual engineers) in Herne Bay and have been there for 50 years, in emergency a personal visit can save the day.
    Try sending a 10 year old Standard Horizon back to the importer for repair, do let us know how you get on.
    Last edited by oldgit; 28-06-19 at 07:33.

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