Question about Connex 3300, Deluxe Amateur Transceiver, 40 Channel AM/FM, Digital LED Indicator

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Cb radio modulation

Friends say the audio is low. Need to up it a bit.

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Www.cbtricks.com
use the vr adjustment points to adjust the AMC modulation. DO NOT cut the mic audio limiter tr-32 or the modulation limiter tr-54. it will over-modulate and splatter out of band if you do

Posted on Jan 10, 2016

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How to adjust audio very poor modulation on transmitt


did you turn the wrong variable? did you experiment?

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I have a Realistic TRC-457.It has very low power and modulation.It is a virgin radio other than someone has replaced the final and driver.I noticet that I cant set the modulation and swr levels on my dosy...


How many watts does it do? If it swings say: 1.5 watts up to 4 watts, someone has installed a swing kit which has a very small carrier. In AM, carrier is not important, its modulation and swing that makes it loud. If its low Audio modulation then it may be that final has went bad too.

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Hi i have a midland 98 plus,i have been told that when i talk it have very low volume and people have to turn their set up to full volume to hear me. but the same mic on a different set works fine


Look at Radio Mods or Defcom mods. To clip modulation diode inside radio. Take to Cb shop to Peak&Tune. It may be wound to high in carrier but not audio. Buy you a "Power Mic" at Radio Shack or WWW.COPPERELECTRONICS.COM.

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The audio amp Transistor is most likely going out. when you have full wattage on a dead key and no or little af output.

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I have a Older 148GTL, when I key down the mike for tx on AM, the red tx lite goes on and the needle pegs, No Modulation is heard on friends radios, appears to work normal on SSB


Hi, my name is John. Welcome to Fixya. Try turning your MIC GAIN to MAX and see what happens. Let me know how it goes, may have further. Thanks for choosing Fixya.....John

Oct 26, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Clipping the Mod limitter


DO NOT CLIP THE LIMITER! You may wind up with splattering audio. The best thing you could do is find the modulation pot and turn it a bit to achieve more modulation. I am not familiar with your radio, so I could not tell you where that pot is. You may be disappointed in the results if you clip the limiter.

Jul 16, 2009 | Radio Shack TRC-447 CB Radio

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2 Inputs on one FM Modulator?


Hello rn10997,

Yes there are 2 input RF Modulators on the market, they even have the plans to build your own. Now here is the problem this constitutes a remote mic which the FCC has deemed illegal. I know you don't want to hera this and will probably rate me low for saying so, but I would rather be rated low that to not first warn you about what you intend to do. That being said here is how it can be done.

From the audio out of your ipod or iTunes device go into one of the audio jacks of your modulator, then connect the other audio input to the CB speaker out this will will allow your to use the modulator to switch between the CB and the iTunes device.

Now for a system containing only one audio input. You can build a pre modulator audio switch which will allow you to switch between the iTunes device and the CB while switching the other connection to normal functionality. If you look on the Internet they have diagrams of such things. If you can not build this yourself you may be able to find an electronics technician to do this for you for a fee.

Take into mind that remote mic'ing is illegal

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Mar 22, 2009 | Cobra Radio Communications

2 Answers

I have a dc2517 it has good sig low audio.


Try adjusting VR 17 in the radio. This is the control to turn up your modulation. Good luck. Also if you don't have a power microphone looking into buying one perhaps from Ebay........

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1 Answer

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Assuming that you've tried another mike, the problem may lie in the speech amplifier circuit within the radio, something that will require someone with technical knowledge to repair.

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142 GTL Good AM Carrier Weak Modulation????


you may have to scope the finals circuit on the modulation to see if all the "inline" caps are installed correctly... be sure your pc board is grounded in all areas as required by specs in your manual. Make sure there is no bleedover and you are sheilding your crystals from the modulation platform. al

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