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My Icom A22 has excessive interference with the 'Rx' symbol light up. Squelch setting is reduced to a minimum. Radio has same effect using either the supplied wipe aerial or a fixed aerial. At times reception can be perfect, then long periods of 'Rx' with noise, but no clear 'voice' coming through. The radio is used on an aircraft with electronic ignition, but reception good at times, but now predominently poor with mostly Rx noise - has worked perfectly in the past. Simon

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  • gbudw1992 May 28, 2009

    I will try switching of the automaic noise level, and using 'zero' squelch, I will probably be flying this weekend.

    I have access to an ICOM A3 radio so I will also take this and try it, to eliminate the aircraft charging system.

    I use the radio only (i.e. battery pack not fitted), supplied by the aircraft 12v battery.



    I will talk agin once I have tried these optio out,



    Simon

    (gbudw1992)

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Have you added any new devices to your craft lately.... computers are horrid noise generaters.

Posted on May 28, 2009

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If at all possible, have you tried using the radio without the Interference Eliminator Code or Carrier Squelch set at 0?

Since the beep works, chances are the audio amp is OK leaving us with only the auto muting (code activated) and/or the if/demodulator stage.

I will not include the RF stages since I am assuming that you have tested its reception with the TX radio pretty close to the non RXing radio.

Posted on May 28, 2009

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1 Answer

Rx symbol is displayed all the time and will not switch off.


It sounds like you have CTCSS (tone squelch) or DCS (Digital coded squelch) turned on, but the normal squelch setting is set too low. This will stop scanning, and as the radio thinks there is a valid signal, it will not transmit. I have no idea what radio you are using, but this is a common situation with modern radio's.

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How do I reduce/eliminate the volume of the static between transmissions


To reduce the static bursts between radio transmissions alter the squelch setting on the radio. You must have a laptop or computer with programming software for that specific model of radio as well as the appropriate programming cable for that model radio.
Once you have downloaded the program from the radio to the computer via the program, change the squelch setting. A nominal squelch setting I use for any radios I program is 75 or higher. After making the alterations to the program, save it to a file on your computer and upload that file to the radio. Turn the radio off and on as necessary.
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I bought a new logic unit (front face) of Icom F121 and it needs to be restored. How do you restore a logic unit for the Icom F121?


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1 Answer

GMR1035-2


Hi,

The RX symbol and static noise would only appear if the squelch is down or if you are receiving something from a transmitter.

Receiving something could mean either an intelligent radio transmission from another comparable unit or this could also be spillover signals from adjacent radio transmitters strong enough to override the squelch settings normally called "splatter". At times, electronic devices could cause this effect such as RFI (radio frequency interference) from units such as a personal computer.

It is also possible that your Monitor Mode is "ON", turning it OFF would possibly resolve the issue To turn OFF monitor mode:Press the vol/mon UP or DOWN key. The RX icon will stop blinking and disappears.

In some cases, a component failure would cause this problem. Your GMR1035-2 uses an Automatic Squelch Feature, this would mean the use of a FM Discriminator Chip for Squelch Control. Most manufacturers uses an MC3357P IC chip for this purpose. This of course would require opening the unit, desoldering the suspected component and solder in a replacement. This would further require that you be familiar with electronic components, circuitry, DVM and a low wattage soldering iron. Should you not be comfortable doing this, perhaps your best bet would be to seek the services of a qualified technician.

Hope this be of some help/idea. Post back how things turned up or should you need additional information.

Good luck and kind regards.

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