If you are in the market for a new CB radio the Cobra® 29 LTD Classic may be the radio for you. This radio has been the trucker's choice for many years. This is due to an excellent reputation for reliability. This is a solid, tried and true CB radio. It includes some of the most commonly sought after features. The 29 LTD also has a traditional style that is commonly associated with CB Radios.
Reliable CB Radio
The Cobra® 29 LTD Classic has been in production since the 1970s. Very little has changed about this radio over the years. That is because this is a radio that works. There are several variations of the 29, but the classic keeps on going. Cobra® is so confident in these radios, they offer a 2 year warranty for them.
Cobra® 29 LTD Features
This radio includes most of the more commonly looked for features in a CB radio. This includes mic gain (dynamike), RF gain, PA and instant emergency channels. It also has an antenna warning light that will let you know when there is a problem with the antenna. The built in SWR meter will save you some money, since you won't have to buy an external meter to tune your CB antenna. The only thing the Cobra® 29LTD is missing is weather channels.
- 40 CB Channels with Channel Indicator/Large digital display for easy readability
- SWR/RF/Signal Strength meter is illuminated and tells you the power output/strength of receiving signal/SWR readings
- Dynamic Microphone is a 4-Pin miniature screw-on type with 9' mic cord
- The Front Panel 4 Pin Mic connector maximizes space and allows installation above or under the dash
- Switchable ANL and Noise Blanking is used to suppress ignition noise & external electrical interference
- SWR Switch allows you the check SWR of the antenna system and to make adjustment
- Squelch Control eliminates background noise in the absence of an incoming signal
- DYNAMIKE Gain Control allows you to deliver 100% modulation at all speaking levels
- CB/PA switch allows use in conjunction with a Public Address speaker
- Bright Dim Switch
- Delta Tune is used to clarify incoming signals
- Instant Channel 9 Switch gives immediate access to this emergency channel
- Red Transmit indicator, Green for receive
- Antenna Warning indicator alerts you to trouble in the antenna system
- Full 4 Watts AM RF Full Legal Power Output
- Two Year Manufacturer Warranty
In The Box
- Cobra® 29 LTD Classic CB Radio
- Mounting C Bracket and Thumb Screws
- Microphone Bracket and Hardware
- Detachable Power Cord - Do you need a replacement power cord? Check out the AUCB91.
- Owner's Manual
- Size: 2 1/4" H x 7 1/4" W x 8 5/8 D
- This is a large radio. It is recommended for vehicles with a little extra space
- The 29 LTD includes a mounting bracket with two 5 mm thumb screws for mounting.
- The power cable for this CB radio is detachable for easier installation
- Looking for a power supply for this radio? Check out the PS8.
Tuning your antenna using the Cobra® 29 LTD Classic:
Turn the radio on.
Set to Channel 40.
Flip switch to CAL for calibration.
Press and hold mic button.
Adjust the SWR CAL dial until meter swings right and sits directly under "CAL" arrow/mark on the meter.
Keeping the mic button depressed, switch the SWR toggle back to SWR and write down the SWR reading on the meter.
Repeat the steps above on Channel 1.
Use your SWR readings for Channel 1 and 40 to make adjustments to your antenna accordingly. Your goal is to have those readings match.
The goal is to achieve similar SWR readings on channel 1 and channel 40 that are within an acceptable SWR range.
- If the reading on channel 1 is higher than the reading on channel 40, your antenna system is too short and you need to lengthen your antenna system.
- For example: If the SWR meter reading on channel 1 is 2.6 and the reading on channel 40 is 1.3, your antenna is too short. Possible solutions include adding a spring or quick disconnect, raising the antenna, getting a longer coax (and just make sure to store any excess coax in a figure eight style, about a foot in length, and loosely bound in the center), or re-positioning the antenna.
- Alternatively, if the reading on channel 40 is higher than channel 1, your antenna system is too long and you need to shorten your antenna system.
- For example: If the SWR meter reading on channel 1 is 1.2 and the reading on channel 40 is 2.3, you'll need to shorten the antenna to get better efficiency. You can do that by turning the tuning tip or the adjusting ring, or you can take the antenna mast out and trim it about 1/8 inch, and place it back firmly against the coil. Remember, it's easier to cut a little more off the antenna than to have to add some length (remember the barber who cut your hair too short?).
If any adjustments are needed, they should be made in small increments. Re-check after each adjustment. Be sure to have all components on the antenna when testing, including the tip/cap if there is one.
If you have already optimized your current antenna setup (similar readings on Channel 1 and 40) and you still want to improve your SWR readings, you can try a different antenna, a different mounting location, or, if you are setting up a dual antenna system, try utilizing only one of the antennas instead of both. Sometimes, you will get better performance from using one antenna instead of two.
SWR Range Explanations:
SWR 1.0-1.5: The ideal range! If your SWR is under 1.5, you're in great shape. If you're at 1.5 and really, really want to drop down to closer to 1 it's likely possible to do with addition tuning, different equipment or a different mounting location. But the drop from 1.5 to 1.0 won't make a substantial increase in performance. It's not nearly as noticeable as, say, going from 2.0 down to 1.5.
SWR 1.5 - 1.9: There's room for improvement, but SWR in this range should still provide adequate performance. Occasionally, due to installations or vehicle variables, it's impossible to get SWR lower than than this. You should try to get it lower, but performance should still be acceptable in this range. If you've tuned the antenna, SWR in this range is likely an issue of a less-than-ideal mounting location for your vehicle and/or an antenna that isn't ideal for the mounting location. To troubleshoot, see this article on problematic CB antenna mounting locations.
SWR 2.0 - 2.4: While not good, this likely won't damage your radio with casual use. However, you should definitely try to improve it if you can. SWR in this range is usually caused by a poor antenna mounting location and/or a poor choice of equipment for your specific vehicle. To troubleshoot, you'll likely need to move the mounting location and/or use a more suitable antenna. It's by no means a good tuning job, but will function if you've exhausted all other troubleshooting possibilities.
SWR 2.5 - 2.9: Performance in this range will be noticeably decreased, and you might even damage your radio if you transmit frequently and for extended periods. We advise you not to operate your radio in this range. SWR in this range is usually caused by a poor mounting location and/or a poor choice of equipment for your specific vehicle. To troubleshoot, you'll likely need to move the mounting location and/or use a more suitable antenna.
SWR 3.0+: Performance will be severely affected, and you're likely to damage your radio with extended transmission use. You SHOULD NOT transmit with your CB at SWR levels above 3.0. If your SWR needle swings all the way to the right (off the charts) when getting your 3.0+ readings, you almost certainly have a major installation problem. This is almost always the result of a poor ground or incorrectly assembled stud, but on rare occasions can indicate a faulty coax, antenna, or incorrectly attached SWR meter.
Additional Info 1
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