Question about Connex 4600 Base CB Radio

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Squealing Noise When keying mic just get squealing noise. Have tried many things and nothing seems to resolve the problem. Any ideas?

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  • mac10guy Nov 17, 2008

    i have the same problum. i have a galaxy dx949 with talkback.
    when i key up with one mic i dont hear my talk back and i cant use my pa and i come out REALLY quiet.
    when i use another mic and i key up my pa works fine but my talkback makes a terrible screeching sound. though my voice does trasmit so does the screech.


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  • 14 Answers

Hi,

Some radios use the push to talk switch in the microphone to ground the receiver section when transmitting instead of a relay in the radio. There may be a problem with that switch, or the switching circuit in the radio itself.

If you have a PA switch make sure it is in the off position, if on it will squeal like a pig!

Posted on Nov 05, 2008

  • h_jules Nov 05, 2008

    Also check the mic cord for breaks or shorts.

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Why is humming coming from speaker when mic is keyed?


this is strange as most times if a proper transmit key is depressed , then the radio switches from receive to transmit , the mfg know this would cause some great squeal from receiver /transmitting so close to a receiver so the part that is the receiver is muted to keep this from happening , id say there is some fault in the part that does this muting of receiver

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Cobra 29 cb receives well, but no one can hear me when I transmit?


open the radio and turn vr 4 wide open but before you do get a new mic and hook it up to eliminate the squeal the turn up vr 4 to raise the modulation.

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Squell when i key up


Squealing sounds come from feedback. Many times is is from an adio source and speaker. Check your radio's switches and jacks to make sure that any external speaker set up in the passenger compartment of the car is connected to the "EXTERNAL SPEAKER" or "EXT SP" jack, and not into one labeled "PA". PA is for "Public Address". When the selector switch is set to "PA" instead of "CB" and the mic's Push To Talk (PTT) button is pressed, what ever sounds picked up by the mic are sent directly to the PA speaker, NOT transmitted on the CB channel. The sound is a high pitched squealing noise that is reduced or eliminated when the mic "gain" is reduced; speaker volume reduced; headphones are used or the distance between mic and speaker is increased.

The feedback can also be from "RF", or radio frequency energy. RF energy feedback is different from audio feedback in that the way to eliminate it is to properly tune or "match" the antenna to the frequency of the RF energy from the radio (in this case, about 4 watts on the low 27Mhz range). This is done by inserting an SWR meter between the transmitter's antenna connector and the antenna. Following the directions included with the meter and adjusting the physical length of the antenna's whip up or down in 1/8" increments will allow you to quickly find the lowest match possible over the range of CB frequencies.

Failure to obtain an acceptable match ratio can result in damage to the transmitter and RF burns to the operator. A match of 2:1 (two to one) is acceptable, but the lower you can get the better. Anything in the 1.5:1 (one point five to one) down to 1.1:1 (one point one to one) range is excellent - with 1.1:1 being ideal.

I hope this helps & good luck!

Jan 06, 2012 | Radio Communications

1 Answer

When transmitting it has a loud squealing noise, it is so bad that i had a problems getting a radio check. HELP


What you describe sounds like feedback ... a contition that exists when two radios are on the same freq and close enough that the signal is re-transmitted as it travels from the speaker of one to the keyed mic of the other. This is a shot in the dark ... can this be the condition you are experiencing?

Thanks for visiting FixYa.comm today.

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I have the same radio as well. If you are running a "stock factory mic".....do this:
VOLUME: set to your comfort
SQUELCH:all the way to the left (if you don't mind hearing everything other wise adjust to the right to illiminate noise)
DYNAMIKE:If you have a factory mic or "noise canceling mic", turn all the way to the right (unless it squeals and then turn the mic gain down slowly until the squealing stops)
RF GAIN:that is your "receive" and I always turn it all the way to the right to maximize reception! In my opinion, this is the dumbest knob ever made since why not hear as good as you can??? thats what the SQUELCH is for!
DELTA TUNE: IT IS "USELESS!!!
SWR CALIBRATE: don't ever trust it! ALWAYS USE A GOOD SWR METER "IN LINE"
Now as for the "SWITCHES"
The top left switch is the SWR and as I stated, do NOT trust it and leave it on "S/RF (TOP)
SWITCH TWO: If you have it on OFF, you may get allot of engine spark plug firing noise so I run mine in the "middle" (ANL)
THIRD SWITCH: CB
FOURTH SWITCH: Brightness is to your liking!
There ya go! You can always set the switches to your liking and comfort.
"WILDCAT" IN LAURELVILLE OHIO

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I have a Connex 4600 Turbo mounted in the headliner of a W900L Kenworth using Wilson 2000 twin antennas and a RK56 mic. When trying to use the "talk-back" feature all I hear is constant...


Strange. You shouldn't have a squealing problem with an RK56 noise canceling mic.

Unfortunately there is no way to change the volume of the talkback. Its too loud. The only solution is to turn the mic gain down.

The only reason you need to have talkback on is to check your audio. Make sure the echo is good and what not. After that you really don't need it on. So turn down the mic gain, then check the echo, then turn off the Talkback and turn the gain back up.

The squeal is feedback from the talkback being to loud and being heard by the mic. So the only way to solve it is to lower the volume of the talkback, (Which is not possible in this radio) lowering the mic gain(which lowers your audio level) or turning it off.

Nov 08, 2010 | Connex 4600 Base CB Radio

1 Answer

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yeah your mic gain is way too high. You can either turn off talk back if you can, or turn the gain down. Depending on how loud the talk back is, your audio may suffer. If that is the case, you will not be able to run that mic. Get an RK-56 or a Skythumper mic. They are noise canceling. You will get no squeal with that mic, and it will sound awesome.

If you really want a roger beep, take it to a tech and them install one.

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in older connex 3300's you cannot disable the talk back. Its part of the audio chain. If you disable the talk back you will loose your audio. There are 2 things you can do.

Hook a relay to the speaker so that when the radio key's id disconnects the speaker. (Big pain, not worth the trouble.)

The other will not disable the talk back but it will stop any squealing.

Use a noise canceling mic. An RK-56 will work great. You will get no squealing with that mic.

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check SWR's check to make sure ALL coax connectors are tight. and if still doing it. may be loose connection in board. but the export style radios go crazy like that when coax is loose or have bad grounds. due to there floating ground circuit design. there not the same as a cobra were its case is ground.

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Maybe check to see if the talkback is turned on.If so, turn it ouff you mght be getting feedback because the mic is too close to radio. Try external speaker, or a nise canceling mic (rk56,or astetic 623),

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Wish you where more specific about the sqeal if it was feedback or echo was acting up. Alos built in roger beet makes tehe short squueal when unkeying mic.

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