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Icom 'dash ... dot'

Old 07-25-2005, 12:54 PM
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Default Icom 'dash ... dot'

I have a problem with my Icom M502 VHF, I'd appreciate any help.

Starting this season, when I have the radio on, I hear a sound from the speaker that sounds like a very regular static 'dash' (about one second) followed by a (much shorter) 'dot'. The pattern repeats indefinitely. It is relatively quiet, not affected by the volume or squelch controls, and happens on all channels, including weather. The radio appears to function normally otherwise.

One more data point - when I turn off my Furuno 1833C/NT NavNet the sound stops.

Makin' me nuts.
Old 07-25-2005, 12:57 PM
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Default Re: Icom

You are getting interference from the BBFF1 sounder in your Navnet system. Is your Icom powered up at the same location as the BBFF1?
Old 07-25-2005, 12:58 PM
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Default Re: Icom

My 402 was picking up noise from my heading sensor. Of course it would go away when I shut it off. May or may not help you out.
Old 07-25-2005, 07:57 PM
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Default Re: Icom

Starting this season, when I have the radio on, .................
What has changed since last season. Add anything electrical? Do any rewiring?


Check all grounds for corrosion. Try relocating the wires from each unit as far away from each other as practical, especially the transducer or sensor cable(s). Do not have them bundled together. If that doesn't help, try supplying power to each from different sources.
Old 07-26-2005, 08:44 AM
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Default RE: Icom 'dash ... dot'

Thanks very much for your replies. First off - it's a M602, not a 502, sorry.

swamppro - when I turn off the BBFF1 from the NavNet menu the sound does not go away. Although I have no way of proving that it actually shuts off the transponder. The radio and the Navnet are on separate breakers but powered by the same batteries.

Mist-Rest - I'll try shutting off the heading sensor and see what happens.

rwidman - excellent question, the electronics are removed and replaced each season by the yard, I'm sure cables are lying differently as a result, I will experiment.
Old 07-27-2005, 12:10 PM
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Default Re: Icom

Turn the Fishfinder OFF, completely. Sounds like it is the transducer cable throwing off RF. If when you turn the FF off, it goes away, they you will have to:

1. Ground both units better. Check and replace grounding connections, check the ground all together. Check the RF grounds.

2. Move the Transducer cable away from the VHF antenna cable. Do they run along side each other? IF so, try to separate them somehow. I know, not an easy task. Good luck.

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