CB Radio Install How-Tos - Jp Magazine

Pete Trasborg Brand Manager, Jp

It's hard to believe that only 20 years ago movies abounded with scofflaws avoiding the fuzz by using Citizens' Band radios and we thought it was far-out. Today, all of us have used a CB and most of us have one installed in our Jeep. It's one of the most prevalent safety tools in an off-roader's satchel of tricks.

154 1104 Cb Radio Install How Tos install Components Photo 35897658

There is no doubt in our minds that the CB is useful. It isn't the best thing we can use, though. Cell phones can call emergency services directly, and HAM radios have a much better range. But if you get out of range of a tower, your fancy phone is just an expensive paperweight that doesn't like water. And that far-reaching HAM radio is most useful only if there is someone on the other end to hear you, and most of the time that means bringing a friend with a HAM radio as well.

On the other hand, most off-roaders have CBs, every big-rig driver has a CB, and most law enforcement bases monitor channel 9 or 19 for emergency calls. The sheer number of CB users means that the CB radio is still number one for trail communication, but if you don't have it installed correctly, you aren't making the most of what you have. We are here to help you hear and be heard.

Over the years we've used just about every cheap or easy-to-get CB you'd like to know about. And we've had every one die a premature death. The one thing we've learned is that most cheap CBs don't like the dust and mud we subject them to. Much as it hurts our skinflint hearts, we've come to always turn to Cobra Electronics for our CB needs. In life as in CBs, you get what you pay for. Whether that money is getting you pixie dust, children's dreams, or just normal high-grade components and an attention to quality control, Cobra is our choice. In this article, we'll show you how to install our two favorite units-the 29 and the 75-in various Jeeps.

The same, unfortunately, goes for antennas. Most antennas on off-road Jeeps are expendable. It isn't a matter of if we break the antenna on a tree somewhere-it is a matter of when. Sure, we use the cheapie antennas on Jeeps we are really going to abuse. In our experience, however, the cheapies just don't get out as far as a good antenna will even if they are both tuned to the same specs. So, we run Wilson antennas on our Jeeps that are staying around a while and not turning into a crumpled ball of metal. We have some preferences in antenna models and mounting locations that we've found get further out and last longer in real world off-road situations.

Federal law now limits the output of CB radios to a mere 4 watts, ostensibly to prevent interference with other electronics. So, the out-of-the-box capability of any CB is entirely up to how you install it, tune it, and what antenna you run with it.

PhotosView Slideshow The Cobra 29 is the full-chassis unit that even our fathers will recognize. This 29 WX NW BT adds some bells and whistles that pops never heard of though. The "WX" stands for the Weather Radio Receiver and provides up-to-the-minute weather related information; it's great for topless Jeeping far from camp. The "NW" indicates it has Nightwatch, which is Cobra's term for an electroluminescent front panel. That is a fancy way of saying it is both more visible, and can be dimmed to let you keep better night vision. The "BT" designation is new and the ultra-geek will love it. When coupled with an external speaker and the gain control of the microphone, you can use this unit as a noise-cancelling Bluetooth for your cellular phone. Shown here is our favorite mounting for CJs and YJs. The 29 also features an analog graph that allows for SWR calibration on the fly. Even if you use an SWR meter to set your antenna, it can't be optimized for the entire range of channels. So, if you go to a channel outside of your set range, you can adjust the SWR from the driver's seat. Shown here is a popular mounting location for '84-'96 Cherokees. Make sure to use some fender washers on the back side of the console, or the unit will eventually pull out. The Cobra 75 is the all-in-microphone unit that makes a great match for any plastic-dashed Jeep, such as a TJ, JK, or later XJ. Shown here is the finished install in a later XJ, but any other plastic-dashboard equipped Jeep will work out the same. The kit includes a control box that mounts behind the dash, the hand-held controller/microphone, a microphone hanger, and a plate and grommet for poking through the dash. One of the cool things about this unit is that when not in use, you can remove it and put it in your console or glovebox to keep it clean, out of the way, and out of sight of thieves.
Our favorite antenna type by far is the base-loaded whip. It is very flexible, so trees are less of a concern, and "base-loaded" means that the coil is in the base of the antenna, so it is less likely to be damaged on the trail. Shown here is a through-the-roof mount of a Wilson 5000 on an MJ. Through the roof is the way to go for best reception on a metal-topped Jeep. There are many options to wiring the CB radio into your Jeep. Since all it needs is a positive and a negative it isn't rocket science to hook up. Your two big decisions are whether to use switched positive or constant. We use constant so that when we get to a stopping point on the trail we can monitor the guys still wheeling without having the Jeep on. A common mistake is to wire the unit into the radio wiring because it is close by and convenient, but it will often make the CB feed back through your stereo. Run the positive wire directly back to the fuse block or to the battery. We usually run the positive and negative all the way back to the battery to make sure that the unit has the cleanest power it can get. For some reason many Jeepers use fiberglass whips. Maybe it is a price-point thing, but we can't get behind it. The first time a normal fiberglass antenna hits a tree or parking garage it is likely to break-especially if it is cold. If you must use a fiberglass whip, we suggest the Flex-4 from Wilson. It can literally bend in half without breaking and performs better than any other fiberglass whip on the market we've found to boot. If you don't have a metal roof but you have a tire carrier, you can modify a trunk lid lip-mount to work on the tire carrier. Shown here is a Wilson 1000 modified to work on a stock Jeep factory tire carrier. In most cases the whip will clear both the spare tire and the top when mounted this way. By removing the antenna before bending the mount, we've never had a problem with this. However, Wilson tells us that by doing this the warranty will be voided. This is on a stock YJ carrier, but TJ and JK stock carriers are very similar. The base-loaded Wilson antennas are removable and a weather-cap is included (shown installed) so you can take the antenna down when not in use for most around-town driving. Until now, passing the CB wire through the firewall or any other sheetmetal has been a lose/lose kind of thing. On cheaper CB antennas the 1-inch diameter plug doesn't come off, and even on better antennas where the plug comes off, there is still a 3/8-inch diameter plug left and 1/4-inch diameter wire to protect from the metal. The new Firewall Boot from Daystar takes care of all the problems you might have and is waterproof to, er, boot. By snipping the zip-tie you can always pass more wires through later if needed and slap another zip-tie on it so it is waterproof again. Ground plane is important for a CB radio. The signal basically reflects off of the ground plane, which in our case is the metal of the Jeep body (why you shouldn't mount the antenna to the fiberglass hard top). Obviously, if you are mounting the antenna through the roof or side of the body you've got a good ground plane. But if you are mounting it on the spare tire carrier you will want to check resistance between the base of the antenna and the body of the Jeep. If the resistance is higher than milli-ohms, run a ground strap from the metal antenna base back to a good ground (such as the tailgate hinge). The best ground straps are the braided ones like the type that runs from the engine to the firewall.