Question about Icom IC-M505 - VHF/DSC Marine Transciever

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Ic m505 not receiving

Radio transmits fine but receives only when other radio is in close proximity

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  • 435 Answers

Turn the squelch down? the RF gain down too
do you have an attenuator turned on ?

Posted on Feb 11, 2015

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SOURCE: Radio not receiving on any channel

Hi Mike,

The manual for this radio (in Adobe .pdf format) is available for download directly from Icom America, free of charges.

Since the "AquaQuake" function works and you do hear static when the squelch is off, that is sufficient to let us know that the voice coil of the speaker is functional and should produce sounds with the right signal applied.

The first thing to determine is if you're close enough to another operating transmitter for the radio to receive a signal. One of the 10 weather channels the radio is capable of tuning should be close enough produce some intelligible audio from the speaker - assuming the squelch setting isn't set too high.

If a WX channel works, then you'll need to see if there's a VHF Marine band transmitter operating nearby. You might need to set another Marine band radio receiver up to verify that there is indeed a signal present on the particular Marine band channel that you're monitoring. A list of frequencies is published on pg 27 (of the manual linked above) in case you need to convert between channel and frequency to tune on a non-channelized radio.

Outside of that, there's little the end user can do without specialized test equipment, schematics and of course, training. Many shops will be happy to provide an estimate for repair when provided with a small bench diagnostic fee. This fee is usually applied towards an authorized repair by most reputable repair shops.

I hope this helps & good luck!

Posted on Nov 27, 2012

Testimonial: "Thanks for providing the additional troubleshooting tips and the link to the manual. "

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1 Answer

Cp200 squeel


This is called feedback. The audio output from the other radio is feeding back through your microphone. Turn the volume down on the radio at a comfortable listening level, and do not transmit when in close proximity. If they can hear you speak, you do not need to transmit.

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Three things come to mind:
1) The radio is receiving, hence the light, but you may have a different PL code than the other radio and it is muting the transmission. Check your programming to be certain both radios are programmed alike. The red light indicates activity on your frequency.
2) Your radio may have a problem with the receive side of the radio or a bad speaker.
3) The transmitting radio may have a problem with transmit. This can be a sign of a bad battery. Swap batteries and see if the problem moves to the other radio. If so, replace the battery. (It takes more energy to transmit than to receive, so loss of transmit is common with a bad battery.)
Best regards.

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look for other fingers that have been in the radio. then back track from there. It could be a switching diode thats burnt.

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Galaxy dx959 will not receive. Speaker is working. S meter is showing incoming signal.


the over power doides may be blown. you should start there .they should be marked D-1 and D-2. you may want to replace them with diodes of a higher rating.

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My cb radio has good reception but only for a short distance, why ?


Make sure your squelch is not on, keep it all the way to the left and the RF Gain must be all the way to the right...

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Baby monoitor reciever piking up no sound or delayed sound - link light flashing


A delay may be caused by interference from other radio sources. I heard of one case where a woman's cell phone call overpowered the transmit power of her baby monitor.

Other things that can cause interference or other receiver problems:
1. monitor in contact or close proximity to running appliances or their cords. (induced electromagnetic field)
2. neighbor with baby monitor on same channel ('cross-talk')
3. distance between transmitter and receiver too far (the strength of a radio signal fall dramatically over larger distances. think of how often you lose cell phone coverage)
4. reduced power: low battery strength or cooked power supply
5. transmitter or receiver insulated from signal (if your monitor was transmitting/receiving through any metal obstruction)

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The squeal in this model is a famous problem. If you look at the circuit board, you'll see there are a few places where it looks as if someone kinda forgot to put in a ground screw -- even to the point that there are threaded holes in the casting just begging to be filled by the little screws used elsewhere nearby. Take 3 or 4 similar screws, put them in the remaining holes, and make sure all (including the existing ones) are snug. It seems there just weren't enough ground points for all the RF swirling around on the solder side of the board, so there's a bit of RF feedback on this radio. And as long as you've got about 16 amps of clean DC, you're fine; the power leads are correctly fused at 20 amps. BTW, the power amp module in this model is really only spec'd at 144-148; if you're running an odd "MARS or CAP" split, the PA brick can get way unhappy. HTH, -- Barney --

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1 Answer

Have Cobra 29 LTD CB Radio w/ bluetooth. Power comes on. Does not receive or transmit. What's wrong?


Sounds like the PLL circuit....... no channel synthesizer will kill the transmit and receive...... bad crystal or IC could be at fault or if someone has attempted to add more channels could also be cause.

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2 Answers

Commercial radio model


Hi,

A Kenwood TM-271A is an amateur radio and therefore restricted to transmit only from 144 - 148 MHz but can receive from 136 to 174.

The TX restriction is done with a resistor (R119) which inhibits transmission outside of the 144-148 band. It is located very near a large IC (IC252).

Depending on your country's radio communications policies and/or your radio license privileges, simply removing R119 would allow transmission outside of the 144-148 MHz.

Hope this be of some help/idea. Post back should yuo need additional information.

Good luck and kind regards.

Oct 18, 2007 | Radio Communications

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