Question about Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

TX fine no RX mic tested and its fine wx rx is fine ,,cb am : nothing.. even LED signal meter not indicating RX. TX 4 watts full bars on LED modulation report :good and yes I have tested with EXT speaker the only thing you can hear in am mode is threshold level when u r adjusting squelch

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Cobra Master
  • 1,795 Answers

To get this fixed is going to cost you more than the radio is worth. Your decision.

Posted on Dec 22, 2014

Ad

5 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 9 Answers

SOURCE: no squelch

Yep that should happen.
Green or no color in receive mode
Red when you key the mic to let you know when you are transmiting

Posted on Mar 07, 2009

  • 181 Answers

SOURCE: tx: fine rx : no..

see if there is a wire of in the end of the mic plug

Posted on May 22, 2009

  • 184 Answers

SOURCE: I have a Cobra 18 wx st. I am not able to transmit

That's usually a defective amc stage that produces RX audio and TX modulation. It's an integrated circuit that will require a tech fixing it. You will have a transmitted carrier with no modulation, and no sound in your speaker. However, make sure you have a good mike plugged in first, and substitute a known good mike to verify it's not the mike. With the WX band working, the above may not apply.

See if you have a carrier...signal going out, but no modulation. Get your Tech to check the mike wiring/circuitry inside the radio, also.

Posted on Sep 01, 2010

Ironfist109
  • 3018 Answers

SOURCE: On my Cobra 25 WX

  • What size fuse are you using? Is this radio a new radio to you? Is it new out of the box? How many muddy footprints are in it. In other words any mods been done to it? If so which?
  • Since you have your multi meter out I'd like you to look at the board that the WX/CB switch is. There will be some resistors and diodes in the general area. One or the other is not letting current flow and is blowing the fuse. Check the resistors and diodes right before the wire that goes to the board the little switch is on. Resistors can test other side and should test for the appropriate Ohms. Diodes should have current in only one direction and if it does not it is bad. If a part is suspect unsolder it to get a conformation of it's functionality. Check for bad solder joints or loose wires too.

  • You may need a new meter as well. You can get one at a great price here. http://www.texxcomm.com/ at the moment their website is being updated but he is a great dealer in CB parts.

  • Check around the mic connector on the inside of your CB. Check for cracks and loose soldier joints. This is gonna take a bit of time for you to go through things.

Regards, Tony

Posted on May 04, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I need wire colors for CB microphone its a TRC


ALTAI PWR MIC - black/braid= earth, red=RX, white=TX, Yellow=MODASTATIC - blue/braid=earth, black=RX, red=TX, white=MOD, Yellow=Spare
SIRTEL ECHO MIC CBE 2002 - black/braid=earth, blue=TX, white=RX, red=MOD007 POWER MIC - brown/braid=earth, green=RX, white=TX, blue=MODSADELTA EC 980 - braid=earth, green=RX, brn=TX, white=MOD
or braid=earth, black=RX, blue=TX, white=MOD

Oct 30, 2016 | Radio Communications

2 Answers

Wiring the mic 4 pin


#1 shield #2 white #3 red #4 black
#1 gr #2 tx #3 tx #4 rx

Apr 10, 2014 | Cobra 25 Wx Nw St Classic Cb Radio With...

1 Answer

GL1800 Goldwing with BikeMP3 cb. Intermittent issue. Somewtimes will TX and RX, other times even with squelch set to 1, nothing. Pinched wire or CB unit itself.


You probably have a damaged mic cord. These are not overly rugged. You might want to replace the mic cable with a quality Beldon mic cable.

Sep 09, 2013 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

Wx works but no cb tx or rx


Antenna good? Receive meter move at all? radio show transmit when key mic? more you tell me the better I can help---I will assume you know enough to make sure RF gain and squelch are set correctly.

and cb/pa in right position........

Apr 27, 2012 | Radio Communications

1 Answer

I have a Cobra 18 wx st. I am not able to transmit anything on it. I have checked the antenna cables and and all external connections. I receive all the wb just fine but the CB gives me nothing. I tried a...


That's usually a defective amc stage that produces RX audio and TX modulation. It's an integrated circuit that will require a tech fixing it. You will have a transmitted carrier with no modulation, and no sound in your speaker. However, make sure you have a good mike plugged in first, and substitute a known good mike to verify it's not the mike. With the WX band working, the above may not apply.

See if you have a carrier...signal going out, but no modulation. Get your Tech to check the mike wiring/circuitry inside the radio, also.

Jul 06, 2010 | Cobra 18 WX ST 40-Channels Base CB Radio

2 Answers

Cobra 18 wx st receives-wont transmit


Take the cover off, flip it over solder side up, check all solder joints for cracks, cold solder joints, check the safety diode where it comes in the radio, before I go further, can you pick up the weather channel?...Does the PA work?...need to check the pre-driver and finals,audio chip, hook up the power meter using a coax three foot jumper from the output from radio to the input of the watt meter, then the antenna, first check the SWR, on the scale on the meter to cal/swr mode,adjust it to spec, then while still keyed down turn the dial to SWR,if it is the safe range your ok,then turn the Dial to 10 or 20 watt scale and key the mic. Does it have any wattage? If not suspect the finals, they are located on the back rail, if it does have RF then its the audio chip, its located on the right side rail facing you,closest to you.remove it and replace it with same ....hope this helps....

May 21, 2010 | Cobra 18 WX ST 40-Channels Base CB Radio

2 Answers

Tx and rx


can you clarifiy? please

Oct 25, 2009 | Midland 4001 40-Channels Base CB Radio

2 Answers

Tx: fine rx : no..


Your power output has blown, they are called your "finals" they can be replaced quite cheaply.

Mar 26, 2009 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

29 help


hi, sounds like you have a problem with the SWR' S Probably too high. Tumbleweed01

Mar 12, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

Not finding what you are looking for?
Cobra 18 WX ST 40-Channels Base CB Radio Logo

Related Topics:

167 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cobra Radio Communications Experts

AnyMHz.com
AnyMHz.com

Level 2 Expert

500 Answers

Brad Brown

Level 3 Expert

16194 Answers

yadayada
yadayada

Level 3 Expert

76846 Answers

Are you a Cobra Radio Communication Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...