Cobra 29 mods. In this video I talk about "Cobra 29" Mods, which is the same as "Uniden PC76" Mods. We would like to show you a description here but the site won’t allow us. com Rooster CB Radio Connection 21. The Mods are as follows: 4700uf Filter Cap, Deadkey Variable, Swingkit, Echo Board, Varia Adding a 520 Mosfet to a Cobra 29 - How much more powerful does it make your radio? Discussion in ' CB Radio Forum ' started by NYSuperTrucker, Mar 21, 2013. Note: Older 29's (LTD and GTL) use the same basic procedure, but instead of re-using the NEW CBer Cobra 29 nw wx st w/ little wil modding questions dornbla9 Mar 12, 2012 amp antenna channel mic mods This circuit will add a variable RF Power feature to Cobra/Uniden Type CB Radios. i don't see why the 2 Is it hard to modify this radio? Im wanting to do it myself, I found a kit on ebay that is supposed to give it 30-40 watts but I really dont want to mess up my radio. Also See Cobra Service Bulletins Page for other info. This circuit is sold under The Cobra 29 is most often modified with swing mods and those types of modifications such as the capacitor/resistor modification will work on this new New Cobra 29 Chrome FM/AM, mods by RC, Ranger Echo Board, Variable power, tr/receive roostercb. : 1pc EKL Components’ EN-1230 1pc EKL Components’ ERF-2030 *1pc 68pF Ceramic Capacitor *Mica or NEW Cobra 29 LX Channel ModificationI discover that the Cobra 29 LX I was asked to do a channel modification on is a new variant, so I show how I do the chan AD203 Stinger amp in a Roadking CB Radio (Cobra 29) Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! High SWR's blew up your radio. The smaller the value, the more the receive is boosted. com So I did the mosfet install on a 29 ltd chrome and followed the directions on cbtricks and I am only showing 12 watts pep. iv been trying to Someone posted a mod here on another thread I started to find mods for that gem I found. See Attachment I recommend, to get your Re: Cobra 29 NW LTD Classic Mods? (New guy) by tdkask » Monday 23rd Jan 2012, 18:47 will take it from there, and tweak for most reasonable signal level with best envelope. i have used a cobra 29 for a few years and it got to where it wasnt performing good enough anymore. A site with hundreds of mods for various cb and amateur radios 🔴 Cobra 29 Ltd Classic Channel Modification - No. It outlines specific capacitor changes to make in the This model has all of the performance and abilities of the prior Cobra 29 LTD models with the addition of talkback and the Bluetooth feature. com Also See Cobra Service Bulletins Page for other info. this mod will give you a variable dead key using VR4, the This document provides instructions for modifying a Cobra 29 hi fi radio to improve its audio performance. Cobra 29 1. theradiogarage@gmail. Change R123 (1 ohm) to a . com Cobra has really shot themselves in the foot with this new radio, why you ask? I'm getting to that but first let me say that Cobra has been the industry leader in Cobra 29 GTL/LTD/CLASSIC POWER TWEAK #1: 1. The modification involves adding a 220uf Optimize your radio’s transmit modulation to get the most from your amplifier! Get the big transmit audio you need to be the one who is heard LOUD The FM transmit audio is going into the BK4802 chip, which is actually an FM 2 way transceiver chip, in this case, only being used in the TX mode, for the Cobra 29 FM radios TX (direct Mods for the Cobra 29 GTL, 29LTD, Uniden PC76 CB radios. 7 Ohm. Cobra 29 ltd classic Direct Injecton Caps, cap, capacitor, direct inject, bass, lows, hi fi, hifi, hi-fi, high fidelity, mod, mods, modification, upgrade, widen, wide audio, Goldfinger, Cobra, The Cobra 29 LX CB radio offers a selectable 4-color LCD display based on the 29 LTD Classic platform. 1277 Extra POWER mod (no soldering) from a Radioddity CS-47 CB Radio. this is the mod I want to do 29GTL/LTD/CLASSIC Just turn up I want to channel mod a cobra 29ltd and a few other am cb radios that need to be modded with a crystal injector board. for Cobra 29, Uniden 76, and Uniden 78 Radios Parts List for Mod. VR3- Squelch VR6-Antenna Warning Indicator A quick way to lower your dead key on a Cobra 29 will work on all Cobra 29 radio's Big, Loud, Cobra 29 LTD Radios Discussion in ' CB Radio Forum ' started by garmich1000, May 23, 2011. Change R58(10 Ohm) to a 2. Locate pin 14 of the PLL chip, and the Positive (+) side of C-12. NEW Cobra 29 LTD AM/FM for the US Delboy Online, CB Radio, HAM Radio, DX-ing, Mods, Modifications, QSL, QSO, BLOG, DX Weekend, Legal SSB/USB/AM/FM, Mods, Cobra 29 WXNWST Mods #152829 by armyguy » February 29th, 2008, 5:52 pm I've been looking for modes for my radio but am only finding cobra 29 ltd mods. 47 Ohm. Set it to 5 swing to almost 10 opened vr4 and 100% is about 1 to 2 oclock mic gain, Have to set the levels on the DM Hey guys, I recently purchased a Cobra 29 LTD Classic It has been peaked and tuned already, but i want to add a few mods into the radio I want to try and add a few in while the radio is The Radio Garage way of converting a cobra 29 or uniden 78 style cb radio chassis to a mosfet final transistor. I went to the local cb shop yesterday and he did a little fine tuning to bump me up to 35 watts. average mobile to mobile range for barefoot (no linear amplifier) radios is around 5-20 miles, depending greatly on your antenna setup. Cobra 29 LX chrome with adjustable rf power, swing kit, Hi-Fi mod I want to expand the frequencies on my 29LTD "front mic" any advice appreciated and can you tell me what is the range they produce? RadioMods Cobra Mods and Tuning List - Free download as PDF File (. Note: Links on this page may include PDF, JPG, DOC, TEXT, or HTML Formats. When doing the swing mod for the Cobra 29, the CBRadioMagazine page suggests adding a variable power with the added 33 ohm resistor and disconnecting the RF Gain wires from I have a 29 wx nw st, and yes, all the mods I have done to it were from the 29 classic and gtl etc mod pages. theradiogarage. Change R123(1 ohm) to Description of how to convert your cobra 29 radio to Mosfet final. Or can someone recommend a model that can be Can it be done? I read somewhere that it is basically like the last model of 29 I think, just has the new digital face and a few firmware extras. Is the Limiter still intact? Variable Power - the mod itself, does it only control the amount of power ALL of the power Signal (audio) and BIAS (DC power) On a Cobra 29 - you have 12 volts DC Subscribed 43 8. It includes modifications such as cutting resistors or capacitors, Below I share my modification video showing what I did for those that may have the required skills, or if it just interests you to know how it is done. POWER TWEAK The Fix: This problem is more common in the "older" 2000's but is relatively easy to fix. There is another way this channel mod could be done, and that is by using a 2nd microcontroller to modify the serial data being sent to the PLL, the same way I did for the Cobra 29Ltd AM/FM variant, Go the new Cobra 29 LX was set to almost 4 watts and 70% mod. Well, before I tuned it up to 6w deadkey. Close to 40 watts Peak! This works for all breeds of cobra 29. Plus like chassis such as the Cobra 1000 Base radio. Might be with the current pll on board. On these units, you must leave the tuning 29GTL Slide Update; Uniden PC33 Info. Remove tuning slug from L14 and discard. if Cobra Mods & Info Documentation Project CBTricks. I have some cheap equipment and I am a college student who Re: Cobra 29 LX Receive audio mods? by ChubbyChops » 25 May 2022, 06:32 Have you checked the detector coil is set correctly? We at bigdawg amps can not be responsible for bad workmanship. com The Cobra 29 LTD super modulation modification It's one of the most popular modifications to have done to your CB radio. After a complete tune up/upgraded final/mosfet/etc, See the attached PDF. I'd put the 2091/2092 diver/final in it as suggested; but where can I get them w/o having to buy Re: Cobra 29 AMC & Hifi by 479tx » Thu Mar 01, 2018 6:26 pm Thanks, Goldfinger! Do you run the JP36 mod on your wide 29? I will try the C73 experiment out and let you know what I find. Free downloads with easy installation instructions. 5 V with a dead key. So far of love this radio. Tweak L20 and L17 for best PEP when modulated. Feel free to pop in and join the discussion! When you use a "fixed" resistor value - and not the variable mod, 100uF may be too much as you drop down the carrier to lower than 2 watts - begins to get sounding like, well - pretty distorted Cobra 29 LTD Classic CB with chrome case & microphone - Includes Peak Performance Upgrade - Now with both AM /FM Modes This is the manual page for Cobra. What other mods Secret CB Index By Model Cobra (Dynascan) Documentation Project CBTricks. 1. I know the xtal freqs just need to make an injector oscillator Cobra 29 LTD Classic by Turkish » Monday 16th Apr 2007, 2:08 Hello I am new to the forums, and new to CB radio as well. I give some info about Swing kits, Dead Keys, Power Supply Voltages & C Great seller and great communication on late shipping COBRA/UNIDEN SUPER MODULATION SWING MOD KIT for Cobra 25, 29, Cobra 29 mosfet question So, I modified my 29LX with a new IRF520 and en1230 in accordance with the instructions listed. Modulation is set after mod is performed usin 40 Watt, High Power Mod. Less than $20 in parts. Or can someone recommend a model that can be I see mentioned many times about adding low channels to the cobra 29s with out an expo kit or xtals. 5 watts by utilizing the channel 9 switch that I never If you need assistance with a radio modification or have any questions, this forum is the perfect place to ask. Anybody here know where on the board this Dustin's Competition Cobra 29's page updated on 07-21-2025 As of now, Fat Boy and Carl Built Amplifiers are the only dealers selling my World Known A buddy hooked this radio up for me. Customers appreciate its excellent display features and This is a clean radio. Thanks. Change R58 (10 Ohm) to a 2. Uses a 2078 - just like the Cobra 25, Cobra 18 II - Cobra 19 DXVLVII - Superbowl Edition - pretty much the "Standard" for CB radio is the 2078. 8K subscribers Subscribe ok, taz's question first, because he posted first. Do you only see the big The other option is too undo the power mods and have the radio operate close too 100% modulation which is both loud and clear,with power mods done your radio will struggle to do 100% Browse the best BeamNG Continental Gt V8 Cobra Edition Mods. If you find that this voltage is not The 29 is thankfully an older through hole parts design, easy to modify and play with. comwww. Find unique mods, popular downloads, and community favorites. Here you will find instruction manuals, service manuals, user guides schematic, brochures etc. Cobra 29 with an RFX75 Amp, from Ebay. Install a 22k-220k ohm resistor between these two points. After tuning is finished, set VR4 to half-way. This is the Cobra 29LX I have picked up and tuned from Curley at Mauldroppers. It's one of the most popular modifications to have done to your CB radio. ive got a wilson silver load mounted on the roof of my I just bought a Cobra 29lx with the digital display. I have just got done installing 7 mods in it. The Transmit Power can be set to any level desired to achieve Maximum Modulation Swing. A. I thought I would see atleast 20 watts pep. 15w pep with the stock 2070 final. Cobra Mods & Info Documentation Project CBTricks. 2. Would anyone have the info or directions on Get a Cobra 29 Nightwatch with our peak upgrade to maximize your radio's performance People have been wanting access to FM mode on CB's for years because it offers clearer sound quality with Cobra 29 LTD Classic high/low power mod? Looking for a solid mod to change the dead key of a Cobra 29 LTD Classic from 4 watts to approx 1-1. 3. If Quick video showing how I did the variable carrier/ dead key mod on a Cobra 29 CB Radio. I know how to solder, Im We would like to show you a description here but the site won’t allow us. 5K views 7 years ago This is just a video of me tuning up new cobra 29 LXmore 29LX COBRA CB RADIO 4 COLOR LCD NOAA/ WEATHER SCAN+ALERT hey guys. Re-tune L14,L13,L12 for maximum forward power. {2 bands of 40 Channels using cobra 29 ltd bt mods by slapshot1540 » Sunday 25th Oct 2009, 22:16 i have a cobra 29 ltd w/ bluetooth jus looking to do some mods. The radio worked good until I attempted a power mod I found. I'd like to install a switch also to turn it on and off. is this correct for cobra 29 ltd lassic mosfet mod? by Hawkeye138 » Wednesday 28th May 2008, 1:02 MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 I've been trying to figure out where to install the electrolytic cap and resistor on my Cobra 29. NOTE: One old model of Cobra 29 utilized a smaller tuning coil at L14. Test with and without to determine best results. The new radios are all going surface mount with no adjustments on the board, all you can do is talk Sticky threads Cobra 29 High Power mod with 2sc1969 transistor Moleculo Dec 15, 2008 172 Jan 16, 2026 Here's what I got: Modulation- VR4 Modulation Limiter- cut D11 (diode right below vr4) AM Power- L12,L13,L14 VR1- This will help receive a bit. Mods for the Uniden PC78 LTX CB radios. This document contains a list of radio modifications and tunings for various Cobra radio models. For the Cobra 29GTL/LTD/WX and yes the 29LX. You'll often hear people say on the Was asked about this in a previous thread , The radio is usually tuned to spec's which would look very close to 5 to 20 give or take a watt either way at 100% Modulation , The cap/resistor I recently picked up a cobra 29 for 20 dollars from a co-worker. i just bought a new cobra 29 night watch, wx, and bluetooth. txt) or read online for free. Look for the collector of TR-23, you should read about 4. 148GTL-DX (Late) Don"t Ask Why? It has been peaked and tuned already, but i want to add a few mods into the radio I want to try and add a few in while the radio is open instead of opening it 4 times or more This document provides instructions for performing a "super modulation modification" on a Cobra 29 LTD CB radio. Works on all cobra 29 radios, ltd and up. pdf), Text File (. RadioMods Cobra Mods and . You'll often hear people say on the radio that their Cobra 29 LTD has had a "swing Take a look at the schematic and finished product below. This is just the basic idea. (Will not fit the Cobra 25/Uniden Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. CB Radio testing. This kit will improve the performance of your Radio on transmit, If you have any questions Cobra 29 LX that came in with a blown final. Everything I have done from swing kits to the final upgrades all worked great Cobra 29 LTD classic #162265 by Git_R_Done » March 29th, 2008, 9:28 am I want to do some simple mods to my radio. Credit should go to CBphreaker whos excellent work and kind mentorship brought these mods to light. If you want to increase the modulation, you can also increase VR4, Back by popular demand. Can it be done? I read somewhere that it is basically like the last model of 29 I think, just has the new digital face and a few firmware extras. & Tune-Up. ) The "Two Bands Mod".
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