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Old 09-07-2018, 00:42   #1
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Location: Portsmouth, UK
Boat: Feltz Scorpion II 12m bermudia rig pilothouse
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Icom IC M505 only receiving when squelch turned down til background noises audible.

I have noticed recently that my vhf was becoming less and less sensitive and it has reached the point where it will only receive anything if the squelch is turned so low that all the background noises are audible, even when the yacht next door is transmitting on full power! It seems to transmit as well as it ever did and still receives DSC alerts. My AIS antenna cable is long enough to allow me to connect it to my radio so I have tried that but it makes no difference so I know it is not antenna related. I have also tried switching off all other electronics to no avail.
Is this a known fault with Icom VHF and if so is their an easy fix?
Also my radio is flush mounted but unlike car radios the cut out for all modern replacements seem to be all different damn sizes!
Any and all advice appreciated, thanks in advance.

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Old 09-07-2018, 01:57   #2
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Re: Icom IC M505 only receiving when squelch turned down til background noises audibl

1. Check you have 12V on the power connector of the radio when transmitting.

If so then:-

2. Try a long piece of wire (say >24') gently pushed into the centre pin of the antenna connector on the the back of the radio. Don't transmit, just receive; if no improvement then your radio is faulty. Repair or replace.
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icom, noise

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