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Truck Driver Reviews on the Cobra 18wx Stii

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  • #one

I've got a Cobra eighteen wx st ii, I know not the best thing in the world but it was costless and mounting information technology in nuance being a single din, cool. Anyhow, whether it's prepare to CB or WX, recieve will cutting out if you cardinal the mic and either take a varying amount of fourth dimension or never come back. Turn the radio off for a while, and it works once again. Information technology is behaving as if the mic is unplugged. Any aid is profoundly appreciated.

KEWB-N1EXA

KEWB-N1EXA

Acushnet Heights Radio 740

Joined
Jan 1, 2020
Messages
416

KEWB-N1EXA

KEWB-N1EXA

Acushnet Heights Radio 740

Joined
January ane, 2020
Messages
416
  • #3

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Just remove the microphone and brusque receive and basis together and see if your event goes away !

This nautical chart should have your Cobra eighteen on it !

Pete N1EXA

WB9YBM

Agile Fellow member

Joined
May half-dozen, 2019
Messages
one,392
  • #four

I've got a Cobra 18 wx st ii, I know not the best thing in the world but it was gratis and mounting information technology in nuance being a single din, cool. Anyway, whether it'south set up to CB or WX, recieve will cut out if you central the mic and either take a varying amount of fourth dimension or never come dorsum. Turn the radio off for a while, and it works again. It is behaving as if the mic is unplugged. Any help is greatly appreciated.

If you lot're sure it's the mic, information technology could be a bad solder connection somewhere or peradventure a break in the cablevision (like where someone accidentally slammed the car door on information technology. Also maybe some error (partial failure?) of the T/R switching diode...

  • #5

The mic is good, I've tried it with a couple different ones. When the mic is plugged in, "RX" is illuminated on the radio. When the mic is unplugged, "RX" goes out. The "RX" indicator never goes out when audio stops, but it acts like the mic is unplugged audio wise.

  • #6

If you're sure information technology's the mic, it could be a bad solder connexion somewhere or possibly a pause in the cable (similar where someone accidentally slammed the motorcar door on it. Also maybe some fault (partial failure?) of the T/R switching diode...

It seems to be worse when cold, leads me to think you may be right about that diode.

  • #7

Update. Got in the truck subsequently work and started playing with it. The audio is actually there, its only EXTREMELY faint. Can't hear it with the engine running. Turn the engine off, and you can hear slight static with the book cranked. Volume knob is working properly.

WB9YBM

Active Member

Joined
May six, 2019
Messages
1,392
  • #eight

Information technology seems to be worse when cold, leads me to call back you may exist right about that diode.

Cold could also mean a cold solder joint someplace...times like that, I'd take a radio back inside and then carefully hit modest areas with freeze spray; when the radio acted up, that's the place with the wonky solder connection.

WB9YBM

Agile Member

Joined
May 6, 2019
Messages
1,392
  • #9

Update. Got in the truck after work and started playing with information technology. The audio is really there, its but EXTREMELY faint. Can't hear it with the engine running. Turn the engine off, and you can hear slight static with the volume cranked. Volume knob is working properly.

My next question would be: is the sound amplifier not getting enough audio in the outset place, or is the amp itself defective?

  • #x

My next question would be: is the audio amplifier not getting enough sound in the first place, or is the amp itself defective?

So, pulled the dash apart in the truck, plugged an external speaker in. Works perfectly through external speaker. Not really certain how they're driven, or separated electronically inside the radio. Part of me thinks that any is supposed to drive the main speaker, has failed. Now I'chiliad wondering if I should just disconnect the speaker and reconnect it to the external speaker output.

WB9YBM

Active Member

Joined
May half-dozen, 2019
Messages
1,392
  • #11

Works perfectly through external speaker. Not really sure how they're driven, or separated electronically inside the radio. Part of me thinks that whatever is supposed to bulldoze the main speaker, has failed.

Whatever drives the external speaker is the same thing that drives the internal speaker, so if the external speaker works than the "driver" (amplifier) works. Information technology sounds similar the internal speaker's not working right--either because of a bad solder connexion or, depending on its' age, the cone could be dried out or torn.

  • #12

Whatsoever drives the external speaker is the aforementioned matter that drives the internal speaker, so if the external speaker works than the "driver" (amplifier) works. It sounds like the internal speaker'southward not working right--either because of a bad solder connection or, depending on its' historic period, the cone could be dried out or torn.

It's not the speaker itself. It does occasionally decide to work. Turned it on just now, worked for a few seconds then no sound again, and if you crank the book all the way upward you lot tin can hear sound very faintly from the speaker.

krokus

krokus

Fellow member

Premium Subscriber

  • #13

It's not the speaker itself. Information technology does occasionally determine to work. Turned it on just at present, worked for a few seconds then no sound once more, and if you crank the book all the way upwards you lot tin hear audio very faintly from the speaker.

Is that with the internal or external speaker?

  • #14

May take an intermittent contact in the External speaker jack the turns off the internal speaker. Common problem.

  • #15

Is that with the internal or external speaker?

The internal speaker. It works properly with the external speaker.

  • #sixteen

May have an intermittent contact in the External speaker jack the turns off the internal speaker. Common trouble.

I will take to pull it apart again and have a look. I would rather have the internal speaker working. Thats why I used this radio in the starting time place, in nuance mount.

  • #17

Took it in the house. Pulled the covers off. Unsoldered the wires from the internal speaker, continued them to some other speaker, no get. Bypassed external speaker jack, notwithstanding no go. I find there is a 22ohm ane watt resistor between the output side of the external speaker jack, and the internal speaker. Resolder the connections, it starts working. I put it all back in the truck and every bit it cools off, sound starts cutting out. Its gotta be that resistor.

  • #eighteen

YAE......

Something must accept flexed to break the fiddling resistor. Perhaps not in your case, merely someone flexing the external speaker plug in the EXT Speaker Jack broke the poor little resistor.

WB9YBM

Active Member

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May vi, 2019
Messages
1,392
  • #19

It's not the speaker itself. It does occasionally decide to work. Turned information technology on merely now, worked for a few seconds then no sound again, and if you crank the book all the style up y'all can hear audio very faintly from the speaker.

Sounds like some kind of intermittent--common cold solder articulation, speaker ringlet coming loose, something like that. How quondam's the speaker? Does the diaphram look faded, worn, torn, etc.?

  • #20

Sounds like some kind of intermittent--cold solder joint, speaker coil coming loose, something like that. How sometime's the speaker? Does the diaphram look faded, worn, torn, etc.?

See in a higher place. Its non the speaker. Its the resistor between the external speaker jack, and the speaker.

dumontabless.blogspot.com

Source: http://forums.radioreference.com/threads/cobra-18-wx-st-ii-no-recieve-audio.419986/

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