Question about Cobra 25 NW LTD 40-Channels Base CB Radio

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I have a cobra 25 with a MAX RAD antenna, 18ft of co-ax and an 80 watt amp. i can hear people from far and near but i sound real scratchy to them what could it be? the mic, antenna, or the co-ax

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Your radio could be over driving the amp or the antenna is allowing RF feedback. I would get rid of the amp and or antenna.

Posted on Feb 13, 2010

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Bought a new galaxy dx98vhp had peked and tuned

Well it sounds to me like you may have a ground plane problem, or whomever "peaked" your radio may have messed with something they shouldn\'t have causing your poor reception. You can try trimming your antenna to get a better SWR, but you also might want to look at your antenna mounting. It may be in the wrong area of your vehicle. Where the antenna is mounted is very important, more so for recieving than transmitting. Is it a magnet mount or is it installed permanently? Where you position the antenna will affect it\'s performance as will the ground plane. If it\'s a magnet mount, it will work best on top of the vehicle roof in the middle of the roof, or in the middle of the trunk. The nearer to the edge of the vehicle, the more ground plane you lose. Where it\'s mounted and how it\'s grounded could even make it directional. Does the antenna have a coil? Is the coil right next to your back window? If so, you need to move it. Try different areas of the vehicle for performance. If your antenna is permanently mounted, it will not work well if it\'s mounted on a corner, or on the edge of a truck bed etc. Ground it with heavy wire to the frame of the vehicle and make sure that the area you make the ground has been cleaned of paint, rust, dirt etc. You want to see shiney bare metal, and when you find the right place to mount it, seal your ground with rubber undercoat spray to prevent rust from messing up your contact with the frame. Your antenna will always work best if mounted in the middle of the roof or trunk where it can use the sheet metal as a ground plane. As far as how far you can get out, that depends on how much power the radio puts out, and how clean your audio signal is. 1.4 swr is OK but it can be much better. If the power was "peaked" too high, your audio is going to suffer in clarity and overall quality. You\'re best off leaving the radio alone and getting an amplifier. Ten watts of ugly power is not going to sound anywhere near as good as 5 watts of clean power, and the extra 5 watts gets you very little extra distance if any at all. To increase an audio signal by 2db, the power of the transmitter needs to triple. For instance, if you are recieving a signal at 2db from a 100 watt radio, the power would have to increase to 300 watts to give you a 4db signal, and you know that a 4db signal isn\'t going to be a whole lot better than a 2db signal as far as being able to hear what is being said. So the difference between having 100 watts and 300 watts is only 2db. And heres where the cleaner audio is going to really pay off. A 6db signal with crappy audio will sound worse than a 4db signal with clean audio. So the radio with the clean audio will sound much better than the radio with twice or 3X the power with crappy audio. So you\'re really not getting much if anything by having your radio "peaked". You may have even ruined your radios audio if the guy doing it is a power freak and doesn\'t understand how good radio signals work, and he pushed your radio to it\'s limits. Get an amp and leave the radio alone. Have it put back to stock and get an amplifier (and don\'t have your amp "peaked")! You\'re better off with 5 watts of clean than 10 watts of dirty. Get your antenna situation fixed and try to get the SWR better and you should be good to go.

Sep 02, 2014 | Radio Communications


Cb ranges in mileage.

I have experimented for many years with various antennas and gain in the frequencies 26.965 to 27.405mhz. I have found that best performances on the Citizens Band is upper channels 37 or 39. This is where the band gets quieter and more close to Fm type communicating. Performance in antenna and hearing is best here. The Antron A99 sitting just 15 feet will get you 50 miles with decent results on a cheap Cobra 19plus or Cobra 21LTD. I can tell you by fact that a Cobra 21Ltd is equal to Cobra 25Ltd's(don't let noone tell you different) Its the same board, same calibration, same wattage plus its about $15 or so dollars cheaper than. Antennas have to be set for your frequency. I have found that the 8.5 ft(102 inch) steel whip performs best at approximate Channel #37 to 40. Homemade antennas built with a 8.25 ft element and 2 8foot rods down the side(ground) with a rod crossing the bottom at 1.5 feet. In the shape of a womans skirt.( Do not let the ground "skirt" touch the pole,seperate it by plastic PVC or milk jug with trash bag ties) I got 50 to 60 miles with this homemade job I would say had a DB gain of 10dbi. I have built home antennas that outperform Antrons. To be safe though and quick to setup is Antron A99 for about $65. Antrons have already set the frequency and low SWR. !!!DO NOT TUNE ANTRON A99 - IT BREAKS INTERNALLY!!! The average range one can get is say 10 to 50 miles average(best at night 10pm to 3 am) Don't expect any better with a Superior radio and tower or linear. A linear may kick hard within 25 miles but after that it fades into low in the distance. Unless you use 10 kilowatt or 25 Kilowatts(Electric bill will increase by $300 more--who needs it) A good power Mic on a straight radio Cobra 21LTD or 25 Ltd will be better than any mid-size linear say up to 250 watts. Your radio itself has potential with antenna gain of equal 25 to 45 watts alone. Mathematically your best with a Super Antenna and Height above 35 feet, plus heavy grounding(chain link fence buried into earth 20 X 20 feet about 8 feet down(a rod 8ft also will work) or if possible a Junk car buried into earth 8-10 feet under your Antenna. Use heavy gauge thick LOWLOSS 50 ohm coax 95% shield less than 100 feet to achieve max power out. Lengths in coax are great at 9,18,27,36 up to 72 feet(No higher than needed) The old timers swear by 72 feet. Antenna Height say: 45 feet tower with 72 feet of Coax is the usual Base setup. FCC restricts antenna towers to 60 feet above ground. No more than 20 feet above your house somewhat(when attached to house roof). No need to put $10,000 dollars in a setup with no more range than others. A mobile radio(Tuned) with Antron A99 will about outdo all Base station radios. Hope this helps you. 73's to you all.

on May 04, 2011 | Radio Communications

1 Answer

I just installed a new 25 lx in my rig, a Freightliner Cascadia. It's automatic test says that the battery voltage is good, but the RF out put is failing. The truck came standard with twin fibergl

It sounds like an antenna or coax problem. Twin antennas are a pain to balance and not worth the effort to install. All twin antennas do is make the antenna manufacturer richer. If the antennas use PL259s that screw into the bottom then they are nothing but water and corrosion traps. You must make sure all connections are clean and tight and waterproofed. I use an MFJ antenna analyzer to check the antennas for all my customers. It can tell you very fast if you have a problem. Any good CB shop will have one. I never trust the cheap SWR watt meters but actually the built in SWR meters on the Cobra radios are not bad indicators. I trust them much more than most external meters. Hope this help at least some. Just use your head and remember that your radio signal needs a good clean and clear unbroken path.

Jul 16, 2012 | Cobra 25 Lx Lx Platform Cb Radio With...

1 Answer

I bought a 1000 watt rating antenna with center coil for my cobra 75 wx st cb,is this a good antenna

    • The antenna is as good as your coax is. Make sure to get a nicely shielded coax.I like RG 213U coax for a setup. 1000 watts means that's what the max rated power handling capacity is. The general rule is go about half of that rating wise is the most you want to put into it.

Jun 21, 2012 | Cobra 75-WXST CB Radio

1 Answer

I have a Rheem Model # 82V52-2 and its being supplied by 25 amp breakers. They do not trip out but the 100 amp main gets real hot and trips out and I believe it happens when the water heater is in use- any...

The Rheem water heater uses 4500 Watt elements
Check label on side of any appliance to see electrical rating details
2 element tank with two 4500 watt elements is still a 4500 watt appliance since both elements are never ON at same time.

Volts x amps = watts
amps = watts divided by volts

amps = 4500 divided by 240Volts or 220Volts
amps = 18.75
Your water heater uses 18.75 amps to 20.45 amps

Your 25 amp breaker should only carry 80% of rated value
25 amps x 80% = 20 amps.

So your water heater breaker is correctly sized.
You should have a 10 gauge wire going to this water heater.
12 gauge wire is a bit undersized for 4500 Watt water heater
Feel the water heater wire to see if it is warm.

If the main breaker is getting hot when 20 additional amps are being used by the water heater.
1) The house is using more amps than your 100 amp main can carry
Using the formula, 100 amps x 80% = 80 amps for the main breaker
Add up your total amp draw.
For example if your 3500 watt oven is ON, it draws 16 amps.
If your 5000 Watt electric heater is on, it draws 23 amps.
Your 1500 Watt 120V microwave draws 12.5 amps.
Add these numbers up plus your water heater, and it comes to 71 amps.
71 amps is getting close to the max 80 amp, but it's not over.
Now if you have a pool pump and and hot tub and a table saw going, the main breaker could be overdrawn.

2) To solve the problem short-term, you can put a timer on the water heater and use it only when needed.

3) The main breaker is bad and needs to be replaced.

If you need help figuring circuits or timers, add a comment and I will help

Nov 05, 2010 | Rheem Water Heaters

2 Answers

I am to trasmitt and receive while ignition key is off but when i turn key on i still am able to transmitt but i receive a lot of stastic. I have replaced the antenna and co ax and redone the ground.

Hi, my name is John. That noise you hear is probably coming from switch,such as ,seat belt warning,door,light, key switch , exc. Try running your CB wire strait to the battery, and see if it stops. If not, Radio Shack sells a noise limiter that goes in line with your connection, don't know how much. Do you have your noise limiter or noise blanker switch on the radio?...hope this was very helpful....

Aug 29, 2010 | Cobra 75 WX ST 40-Channels Handheld CB...

1 Answer

I hooked up a 2-Ohm dual voice coil 800 watt max 12" Kicker CVR subwoofer and 4-Ohm single voice coil 1000 watt max 12" Kenwood KFC subwoofer to 1000 watt Kenwood Ampilifer. After hooking it up, the Kicker...

off the same amp? you have two way different sounding speakers man. you can buy 2 identical speakers from the same company and brand and series and they will play differently every time. you have 2 speakers with nothing in common so you will hear a difference and maybe interference because of the different ohm levels.

Apr 14, 2010 | Kicker CVR12 Car Subwoofer

2 Answers

I also have another cobra 29 ltd classic and it works fine but i cant talk or hear what other factory cb's can hear, it is supposed to be tuned and peaked and i have a wilson 2,000 antenna, and i cant talk...

nearly all problems are caused by poorly tuned or untuned antennas. a good antenna system with a cheap stock radio will out perform a great tuned radio with a bad antenna system any day of the week. if you dont believe me, check the firestik antenna website's tech notes. or wilson's tech notes.

Sep 23, 2009 | Cobra 29 LTD CB Radio

3 Answers

What would be a good size linear to add to a cobar 29 that has been peek and tuned and echo board put in it

for a mobile or home base setup 100 - 250 watts is enough on all modes am / fm / ssb / cw, 1000w or 1 kw would be a overkill. what transmitters rely on is a tuned antenna and swr near 1:1 or 1:1.5, achieving a good tuned antenna will give you a clean output and good signal.

Jul 17, 2009 | Cobra 29 LTD CB Radio

2 Answers

Transmits but does not Receive

Check your microphone by swapping with another duplicate. If no differance, you will need a SWR meter (standing wave ratio) to find the culprit. It attaches in line of the coax and determinds power out and reflected power. The reading should be 25 watts foward and max of 1 reflected.

Oct 22, 2008 | Cobra Mr F75b Marine Vhf Radio Fixed Mount...

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