Cobra 25 ltd
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Lineman
- Super Mud-Duck
- Posts: 8
- Joined: February 23rd, 2013, 5:26 pm
- Real Name: Derick bray
Cobra 25 ltd
I have a cobra 25 ltd that I was messing around with until I get my other radio in and It is acting funny. You can be driving up the road listening to a conversation and the radio will be working like a New one. Then at any time it will randomly quit receiving. The squelch will go away it will not transmit or anything. Then it will randomly start working great again. Any ideas?
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1 ADAM 12
- Skipshooter
- Posts: 261
- Joined: January 31st, 2013, 8:47 pm
- Handle: 1ADAM12
- Real Name: Adam
- Radio: General Lee
- Contact:
Have you had any mic problems with this radio in the past? Try plugging in a different mic and see if that helps anything.
1-ADAM-12
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p38
- Skipshooter
- Posts: 284
- Joined: December 7th, 2012, 4:43 pm
- Handle: P38
- Real Name: Jonathan card
- Antenna: wilson5k,sirio!
- Radio: magnums9 /madison
- Contact:
Try a different mic sounds like a bad ground wire on the mics plug.check the inside of the radio as well look for cracked solder or lose wires
Jack of all trades ,master of none
ASE certified technician
my radios -cobra 25ltd /cobra 29ltdX2 /trc-501 / 1977 president madison am-usb-lsb/ magnum deltaforce 10meter /stryker 955hp magnums9 . imax 2000/ 102whip /k40 mag mount aracher crossbow 3 element on the flat side.
ASE certified technician
my radios -cobra 25ltd /cobra 29ltdX2 /trc-501 / 1977 president madison am-usb-lsb/ magnum deltaforce 10meter /stryker 955hp magnums9 . imax 2000/ 102whip /k40 mag mount aracher crossbow 3 element on the flat side.
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wildcat2488
- NEW DUCK
- Posts: 1
- Joined: March 21st, 2013, 10:46 am
- Real Name: Robert
sounds like a cold solder joint to me sir.Lineman wrote:I have a cobra 25 ltd that I was messing around with until I get my other radio in and It is acting funny. You can be driving up the road listening to a conversation and the radio will be working like a New one. Then at any time it will randomly quit receiving. The squelch will go away it will not transmit or anything. Then it will randomly start working great again. Any ideas?
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TheCBDoctor
- Sponsor
- Posts: 2,823
- Joined: March 13th, 2009, 2:54 pm
- Handle: Rick
- Real Name: Rick
- Antenna: Wilson 2000
- Radio: HR 2510
- Contact:
Hi Lineman,
If you take the radio cover off and gently press on the board you most likely will find that the radio has a bad solder connection. Looking at the solder side of the board and using a non-metallic object, such as the eraser end of a pencil, gently press on the board near the waxed area on the right front portion of the board. This the PLL/VCO circuit. The radio should cut in and out as you gently press on the board. You may also try freeze spray.
Since, both Tx and Rx cut out the problem has to be a circuit common to both functions. This a common problem with many radios. The circuit is a high impedance circuit, so it doesn't take much for it to act up if the board was not prepped properly from the factory. Looking at the component side of the board it is the area covered with bee's wax. The problem with many of the newer radios is quality control. The Chinese do not prep the board very well before running it through the solder bath. If it is an older radio it may be because of years of the board expanding and contracting due to temperature.
The components may be making a mechanical connection, but not a good electrical connection. I find that a third of the radios I have repaired are due to a bad solder connection.
Good luck
If you take the radio cover off and gently press on the board you most likely will find that the radio has a bad solder connection. Looking at the solder side of the board and using a non-metallic object, such as the eraser end of a pencil, gently press on the board near the waxed area on the right front portion of the board. This the PLL/VCO circuit. The radio should cut in and out as you gently press on the board. You may also try freeze spray.
Since, both Tx and Rx cut out the problem has to be a circuit common to both functions. This a common problem with many radios. The circuit is a high impedance circuit, so it doesn't take much for it to act up if the board was not prepped properly from the factory. Looking at the component side of the board it is the area covered with bee's wax. The problem with many of the newer radios is quality control. The Chinese do not prep the board very well before running it through the solder bath. If it is an older radio it may be because of years of the board expanding and contracting due to temperature.
The components may be making a mechanical connection, but not a good electrical connection. I find that a third of the radios I have repaired are due to a bad solder connection.
Good luck
Respectfully as always,
Rick
Rick
