Question about Cobra 29 WX NW ST 40-Channels Base CB Radio

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Distance of reception

Hello i have two sandwich vans in the peak district on the a57 snake pass but where one of them is situated there is no phone reception on any network as it is sites right in the valley and it ia about 10 miles away from the other one.we need to contact each other as a matter of safety and as there are no two way redios that would work i want to know if there is a cb that would be able to be used under those conditions ,,,,thanks geoff

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Oh yeah. The best radio to get reach that distance with no problem would be a 10 meter, such as a General Lee, Connex, Stryker, or Galaxy with a 2 digit model number. Those, with a good antenna set up properly, will reach out 10 miles real clear and up to 14 - 15 miles with some reception loss.

Regular cb radios, such as Cobra, Galaxy 3 digit model numbers, Uniden, etc will have a decent reception, but generally when used barefoot, will only transmit and recieve about 6 miles real clear and up to 9 or 10 miles with a decent amount of signal loss.

Now, you do not have to have a big, expensive antenna to get the distance you want, you can do it with just a cheaper fiberglass stick antenna like a Francis 4 1/2 foot. After I installed a Francis antenna and a General Lee on a tuck outfited the other day, I was able to talk to a man apx 14 miles from my location.

The main thing to look for when installing the antenna is that you have a good coax (braided center conducto and 95% braided sheilding), and that the antenna is not grounded out, just the bracket (this is what makes your ground plane). Make sure the nylon spacer (looks like a plastic washer with a lip on it) is place on top of the antenna mount, with the lip facing down through the hole. You can use a magnet mount antenna, but you will have much much better luck with a hard mounted antenna.

If you have more questions, or if you need me to send a picture showing the placement of the antenna and bracket parts, dont hesitate to email me.

Dean Pitts
Rollin CBs

Posted on Aug 31, 2008

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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

1 Answer

Cant hear other radios if over 1/4 mile away

Are you using the noise blanker? Are you also finding noise on regular AM radio in vehicle? How good is the connection on the coax?

How good is the antenna ground to chassis? How good is the antenna?

If you address the various sources of general RF hash that would also aflict the AM reception in your vehicle, that would be the first thing to address. It would probably be a good idea to use some contact cleaner or LPS1 and spray down the switches and controls. I know on one of my own that the dirty contacts are enough to kill off reception.

If these things do not improve it, and you do not mind going into the radio- in the reciever stages are a number of 1N60 diodes, and they have a nasty habit of becoming leaky and noisy. Replacing them should help quite a lot if nothing up to this point has.

Jan 27, 2012 | Cobra 29 LTD CB Radio

1 Answer

I have a Radioshack trc-487 cb radio with weather band . I would like to turn up the modulation... Peak and tune... get better reception... anything... I would like to know the internal parts I have to...

Hello Randy, do you have a fiberglass or stainless whip? What is your SWR & power meter readings now? --- The stainless whip may be creating a feedback and picking up static from transformers. Do you have a power microphone? If so you need to use a modulation meter to set it for 100% modulation. It could also be causing the crackling, that or your engine alternator.

A 1:1 SWR implies a perfect match between all elements of the antenna system...this is what you want. If an antenna system is not working well, the power reflected by the antenna will travel back through the transmission line and arrive at the output of the transceiver. From a practical point of view, SWR numbers in the range from 1:1 to 1.5:1 are considered to be very good, meaning that the antenna is radiating most of the power sent to it...

I would not recommend tweaking the boards on the realistic radios. You can however tune your whip. Start by making a base coil with some copper wire, 14 gauge will work. Run one end under the whip mount end and then tightly wrap the wire around the base of the whip. Experiment with 20 - 30 wraps for best performance & SWR.

The Astatic 575M6, or the Sadelta MB-4(hard to find) are very good power microphones that will help with modulation and peak power transmissions. Let me know if you need more help with tuning, if the "crackling" is still there.

Here is a link for your radio, in case you don't have one.

Nov 16, 2011 | Radio Communications

2 Answers

Does a midland cb 40 ch have a range for distance?

  • Hi, I can help.

  • In general a CB goes roughly 1 mile per watt of power. A Midland CB out of the box will get you about 5 miles. After a Peak and Tune, a Midland CB can get out around 25 miles. If you put an SWR/Watt meter inline you can tell how much your rig is putting out.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

regards, Tony

Sep 01, 2011 | Midland Radio Communications

1 Answer

RCI 2995DX Had it peaked tuned and realigned plus modulation upgrade done. Some times people say I am over driving and I sound splattered and other times people say its perfect. What could cause this?

People have different idea's of what sounds good. Some people thing that loud and over modulated sounds good, Also, distance has something to do with it too. Some one close is going to hear it more if you are over modulated, where as too some one far away it may not sound over modulated because of the distance.

Also, if some one is really close, then you will sound over modulated, even when you don't. It is not due to over modulation. It is because you are over loading their receive section of the radio because you are close.

You need to have some one you know, and trust as a good judge of audio and do some checks with them. If some one says you sound over modulated, and splattering, you probably are if they are not really close to you. Back it down until they say it has stopped.

Jul 27, 2011 | Galaxy Radios DX-2547 40-Channels Base CB...

1 Answer

Have a cobra 148 gtl cb/ssb. It is brand new. I hvae it hooked up and have tuned the antenna using the swr meter on the cb. I habe channel 1 and channel 40 metting at about 1.6 swr. I have what appears to...

Hi, my name is John. Welcome to FixYa. Check your antenna, you need to set it with a real SWR meter, pick one up at any near-by CB shack $10.00. Thanks for choosing Fixya...John

Jul 22, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Radio reception

Cb radio is line of sight. If there is a hill in the way, or some other kind of structure it will block the radio waves.

But also, radio waves, will bounce of the ionosphere and come back down.

So whats probably happening is...

You hear people close because they are near. You can't hear some one some what far away because of hills or something, but you talk to people far away because the are within range of the radio waves bouncing back down to them

Jul 10, 2010 | Cobra 25 WX-NW-ST 40-Channels Base CB...

2 Answers

My cb radio has good reception but only for a short distance, why ?

Make sure your squelch is not on, keep it all the way to the left and the RF Gain must be all the way to the right...

May 21, 2010 | Cobra 29 LTD CB Radio

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

2 Answers

Cobra 25 LTD - building causing a shadow area

The older base station was probably peaked and tuned by a CB shop, basically giving it a lot more power. Stock radios very rarely have a full 4watts of power, to tell you the truth. Mine now does 5 1/2 watts and swings to around 20 when I talk. Might be a good investment. Oh, the antenna can't be too big for any wattage. Might want to recheck the antenna's tuning, though...

The truckers wont pop the fuse at all, but I might recommend backing your RF gain down some when they are that close so they dont burn up your receive.

Jan 14, 2009 | Cobra 29 LTD CB Radio

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