Question about Cobra 25 LTD 40-Channels Base CB Radio

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New final meter says it is not tx wattage

Cobra 25 ltd with erf 2030 still transmitting only 4 watts i saw the specs should be between 25watts and 40 watts

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  • Dean Dishman May 11, 2010

    Did you do the mod your self? Did you realign the radio?What kind of meter are you using?This Mod has been under a lot of controversy ive done 10 or more radios with this mod and all have turned out different. The 25s never get more than about 10 watts. some times not even that.

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The ERF 2030 will not work with out the added companion parts that need to be added with!! I am assuming you had all the parts with the ERF 2030 and instructions??

The added parts are as follows: along with the ERF 2030
1-EN 1230 & 1- pF Ceramic disk capacitor

E-mail us for other details

Dennis

Posted on Aug 29, 2009

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1 Answer

Low pep cobra 29 nw erf 2030


did you also change the driver at the same time?

Jan 03, 2014 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Can you turn the rf gain pod up for better receiving


Yes you can turn up VR pot inside to recieve max level but will cause noise to be max too. I don't rightfully remember which one does it but I'll refer you to Defcom cb radio mods for a spec sheet
or Snakedoctors cb radio mods google site. Go to these radio mods sites on Google search and type in radio model. It will tell you what Vr inside to turn up RX of RF gain. Turn up modulation and written instruction if you are handy with solder gun how to change a resistor or cap to make it more sensitive recieve. How to replace final stage and resistors to 1/2 watt size for 6 more watts output and spread coils 1/8 inch apart like a comb for 100% microphone loudness or swing output. say 3 watts to 40 watts output. More windshield wiper swing in meter makes loud voice and extends range with Power final boost. Most people prefer to keep a mobile at around 11 watts swing to 45 watts.(but on generic radio meter will show 2 to 5 watts-its not accurate just a cheap indicator you are forward swing). Even though factory says 4 watts FCC hogwash. They come tuned from Cobra with 11 watts to 14-22 watts.Cobra really peaks them babies so competition doesn't beat them out like new louder radios made by Galaxy 55. Even though law says blah blah (corporations bend it)sales pitch Galaxy very heated with Cobra on the game(rich can do what they want)Galaxy is 20 watts factory with big promise to 40 watts dual finals. So Cobra updated and said "screw it we will break the law too" Now Cobra is loud as ever and offering their own super mod versions and dual final radios with 45 to 65 watts output with ranges on SSB & USB of 1500 miles on a strong good outdoor antenna.

Feb 15, 2013 | Cobra 29 LTD CB Radio

1 Answer

On my Cobra 25 LTD CLassic, New my meter drops when transmitting


is this a new out of the box radio?if so you might need a tech to look at it because it could be an internal problem.It would have to be put on an analyzer and a scope to actually be seen doing what you say.don't worry because it can be fixed.the cost of fixing it is the problem.You have to decide whether you want to pay more for the repair than you paid for the radio. Either way,new or used the answer is the same.

Sep 30, 2012 | Cobra 25 LTD 40-Channel CB Radio

1 Answer

I have a cobra 25 ltd classic that I bought from a CB shop it was fixed to have 50 W .you can see all the changes made on it .I have it hooked up with two wips 4 ft 1000 w fire sticks and a power mike it...


either he over tuned it and burned the radio out this can happen just cause a radio transmits 50 watts dosent mean the circuity can handle it and it will burn the radio because of overload. another factor is if you are running high swrs with that kinda out put you will fry it sounds like its getting hot and radios dont work well when they get hot take it to a tech tell him what was done to the radio and what it is doing. you can test the radio by buying a watt modulation meter it will tell you excacley what the radio is putting out I doubt its transmitting 50 watts that is a single final radio unless he modified the final.good luck.

Jan 15, 2011 | Cobra 25 LTD 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

1 Answer

How many amps when keyed?


It depends on how much wattage it is putting out. If its stock, its doing about 4 watts. But even with it being peaked, you wouldn't need more then 4 amps power supply to run it.

Nov 02, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

I have a cobra 25 ltd and when i key the mic the gauge of the db barley goes up. is something wrong ? also the gauge says its measuring tx power what does that actually mean/ do


TX means transmit. There are 3 settings for the meter. The top one is to measure your TX/RX that's transmit and receive. CAL is to calibrate the meter to check your SWR.

Reasons your needle may not be moving much when you key while on TX/RX. The dynamic is probably all the way down. That is your mic gain. If you turn that up when you talk the needle will swing more. If the radio is stock and not modded, you can turn this all the way up and leave it.

Also there could be something wrong with the mic. If people can hear you then its not the mic.

If people can hear you fine when you transmit, it may just be a bad meter. Not a big problem, you will just need an external meter to make sure you swr is not high.this is important because if it is over 1.5 you run the risk of blowing the final transistor.

Oct 11, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29LTD CHROME low tx no mod, rx good low Vol, talkback good


1 why would you change the finals?? Have you checked you antenna? How are your SWR's? Crappy antenna's cause a lot of problems.

Use an external meter to see what the SWR is, and see what the output is PEP. If its low, then there is something wrong. If it is High, change the mic and turn up the dynamic all the way.

Next. Have you been messing around in there?? Tryin to get more wattage? You turned VR4? If you thought you were turning it up by turning it all the way to the right, you turned it all the way down. Turn it all the way to the left.

Jun 05, 2009 | Cobra 29 LTD CB Radio

1 Answer

New Cobra 29 ltd


Hi,

Appreciate the direct "Ask Me". If I may clear up your concern:
  • you have two CB radios, one is a Cobra 29LTD and the other?
  • both have received and both do not transmit;
  • you have two trucks, one with a Firecracker 1000 antenna, and the other?
In any case and initially, TX (transmit problems) could be caused by:
  • defective PTT/mic;
  • defective finals/drivers;
  • defective PL-259 connector/RG58 Cable;
  • antenna grounding/SWR;
  • other electronics internally
Please check the above. You may need an SWR meter, a watt meter and a DVM/VOM to perform the tests.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Nov 05, 2008 | Cobra 29 LTD CB Radio

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