Cobra 29 receive mod. just wondering which transistor and diodes to replace.

that gives you quiet talkback. CB radios can easily be damaged when tampered with by an untrained individual. Aug 24, 2014 · Please don't for the love of god use a pre-amp unless the S meter is on zero on receive without it turned on. have tried new diodes checked for bad traces etc but no luck in finding this problem. this radio has 1969 final too. I disagree though Oct 2, 2004 · The Cobra 138 and 139-XLR SSB radios have a relay in them. The Cobra® 29 LX BT is a step up from the 29 LX base model with several advanced technology features not found on other CB radios. Apr 22, 2005 · I search the internet and found quite a few replies on forums about increasing the dismal Cobra Cam 88 modulation as set by the factory. Dec 3, 2009 · Modulation mods but a dead key of 1. when the mike is keyed, the varactor diode's control voltage comes from a resistor and diode connected to the transmit-only voltage. irf520 mosfet for cobra 29. 47 Ohm. Finally, coverage under COBRA is retroactive to the date of the qualifying event, and the first payment can be due within 45 days after you elect to participate. Replies 32 Receive mention alerts; Mar 24, 2013 · I have a Cobra 29 LTD NW that had garbled receive audio after warming up for about 5-20 minutes (was clear and strong when first powered up). Is RT4 the same as VR4 ? Any answers greatly appreciated. Receive Boost Cobra 29 One, Locate pin 14 of the PLL chip The Cobra 29 LX is a radio device that offers a range of features and functionality. After a complete tune up/upgraded final/mosfet/etc, See the attached PDF. 7 Ohm. A switch can be installed in series with the negative leg if needed. 22-24guage wire 220k to 470k ohm 1/4 or 1/2watt resistor. Save cobra 29 mosfet mod to get e-mail alerts and updates on your eBay Feed. Whether or not the meter has been replaced, I've no idea. 0068uF (682) mylar to a 1uF-2. 5uF tantalum with the + side towards the right side of the radio. also, was there any improvement on the receive, and do big radios hurt the radio with this mod. Install a 22k-220k ohm resistor between these two points. You'll often hear people say on the radio that their Cobra 29 LTD has had a "swing mod" or "Super mod" done to it. 3. With dimensions measuring 177 x 203 x 51 millimeters, this radio is compact and portable, making it easy to transport and use in various settings. Also for: 29 wx st. Nov 4, 2011 · Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. The smaller the value, the more the receive is boosted. Wire the circuit as shown in the diagram using the parts listed below. New T27(I think) and 3 new diodes. Additionally it can be dangerous and may expose you to electrical shock, injury, or death. Fixing to put in a cap and resistor mod and talk back with the resistor across the ext speaker and pa . Opens Oct 8, 2009 · Connect with CB radio enthusiasts at CB Radio Talk Forum. are you sure the mosfet you installed is up to snuff. I want to hook up the talk back to the channel 9 switch. drive. Dec 15, 2008 · You can turn a 4Watt output radio into a 350mW Transmitter - but simply removing the Final and Removing the Power Choke coil (like that on a Cobra 29 - L15). com/March%202007/Cobra%2029%20LTD%20Super%20Modulation%20Modification. range. I know to replace TR1 with the 2sc2999 but what diodes do I replace? Anyone have a good schematic and full parts list for a 25 LTD Classic? Aug 13, 2008 · 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 frequency) and RX (offset by +10. Any radio with an audio transformer uses the same audio section for both the transmit and receive. I just did it to my General Lee and noticed a big difference in static level. The COBRA 29 LX 40-Channel CB Radio has a selectable, easy-to-read 4-color LCD display with customizable night and day settings. These mods maximize the radios capabilities while still sounding clean. The radio worked good until I attempted a power mod I found. also did you peak the stages going to the mosfet after the new install. The Cobra 29 LTD CB radio has been the standard of excellence in professional CB radios for over 50 years. The receive on mine was ok, not great quality, but it was ok. Model: 29 LX . Durable, reliable, and full-featured, you'll get clear CB communication on the road with 4 watts of power, 40 channels, and new dual-mode AM/FM functionality. Apr 6, 2016 · sorry pa was working before this happen but now no pa that was one reason i put a new audio chip in. Dec 18, 2008 · The IRF 520 mod Hello evreyone, I recently preformed the IRF 520 mod to a cobra 25 LTD ( that i just bought ) & I made sure I followed step for step. 032" 60/40 mix or similar mix. by Last post by KP68 Tuesday, 13 September 2022, 15:56 PM; Cobra 139xlr mod. But when you have your radio connect to a base antenna you make any different. I just want to build the ultimate Cobra 29 . What will strike you when you first see the radio is the up-to-date looks and large, clear LCD display. you can do it on the rear of the board. - 399 Aug 30, 2018 · Later "A" and "A+" kits used a dirty trick to get that '45 channel' jump from the same, old crystals. I have done the SC2999 and 1N6263 mods in my Galaxy 95t2 with good results. Change R58(10 Ohm) to a 2. Lastly, the 29 LX includes a redesigned ergonomic microphone for easy and comfortable use. Specs Model / SKU: Cobra 29 LTDFM Recommended for: Use in pick-up trucks, semi trucks and other vehicles with ample room for mounting a Oct 22, 2006 · cobra 29 wx nw st mods. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with The Cobra 29 WX NW ST is a radio with a total of 40 channels, allowing for versatile communication options. A page which list's the modulation boosts and tune ups for the cobra range of radio's. Aug 4, 2012 · this? CB Tips and Tricks MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). by littlesilver3 » Friday, 11 January 2008, 2:59 AM. Variable Power w/ M-80 Super Modulator Swing Kit Built In ( FOR COBRA 25/29 & UNIDEN 66/68/76/78 ONLY) The V-MOD kit gives you all of the same options as the Classic M-80 Super Modulator kit, but, we have added the ability to manually control your radios dead key setting with a simple to install control module. Dec 25, 2017 · Cobra 29 LTD: Receive Boost: Locate pin 14 of the PLL chip, and the Positive (+) side of C-12. Sound is very weak and full of static when I key. pdf ( It's upside down, so you'll need to rotate it) Basic Tuneup: Set mode to FM, Channel 40, Band E Low. 695, High Side injection into the 1st mixer). Attach the positive leg of a 47uf electrolytic cap (for quick windup) or a 100uf electrolytic cap (longer windup) to the banded end of D18. 1. 5 watts. My output went from a 2-5W to a Cobra 29 lx receive mod Copper Talk » Ask The Tech » Modifications « Previous Next » Thread Last Poster Posts Pages Last Post Direct inject on Uniden PC76xlTech8332 1 4-02-21 2:22 am Cobra 200 gtl frequency driftTech8332 1 8-19-20 11:58 am Help with Workman Roger K - Instructions and Specs Model / SKU: Cobra 29 LX MAX Recommended for: Use in pick-up trucks, semi trucks Free shipping $99+ (excludes antennas) TECHNICAL & INSTALLATION RESOURCES | 100,000+ SATISFIED CUSTOMERS TECHNICAL & INSTALLATION RESOURCES Mar 27, 2024 · Uniden PC33, PC35, Uniden Pro 710E. Plug extension speaker in to the PA socket switch the radio to the PA mode key the mic and speak there should be some output from the extension speaker, if there is no output the Audio IC4 is duff (and not the beer) just replace it, but if all is ok check with a DVM at the collector of TR12 and open and close the squelch the voltage should be about 9. When I get the rest of it sorted out I'd like to do the Schotty diode/transistor receive upgrade, and possibly a variable DK hooked to the RF gain knob. is there any difference on the Philly model from the Taiwan model and what are those differences. For the Cobra 29GTL/LTD/WX and yes the 29LX or uniden radio's that use the µPD2816 PLL IC such as the 68Elite & LTW plus the 78Elite & LTW. it sounds loud over my monitor radio and the talkback but being clipped you should get full swing with a whisper. Feb 17, 2012 · I got one of these when they first came out (the EU one) as I was impressed by how smart looking they are. 0. Amazon. Now featuring dual-mode AM/FM functionality, you'll enjoy clearer sound with minimized background noise plus backward compatibility with older AM-only CB radios. maybe its time to travel to a cb shop just hate that long drive. I put it on the shelf for about two years. Description. 400 TO 162. Thread starter Snack Man; Start date Oct 22, 2006; 1; 2; Next. May 1, 2012 · , cobra 29 receive mods, cobra 29 diodes for receive mod, powered by vBulletin cb radio modification, cobra 148 receive mods, 2sc2999e and dode mod for cobra 29, cobra mods, cobra 29 mods, improving cobra 29 receive mod, schottkey recieve mod, recieve mod for cobra 29, schottky cobra 29, cobra 29 home made, cb receive mods, cobra 29 receive Dec 15, 2008 · Cobra 29 High Power mod with 2sc1969 transistor. (No need to cut limiter what so ever) There are many different valued caps and Oct 28, 2015 · Motor Mouth Maul did this by putting an electrolytic cap on the transmit side of the Cobra 29 clarifier circuit. has great affect also. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. . 2 watts with swing to 4. Does anyone know what this mod is called and if there’s other parts That may have been change, added or removed. Model. 0 watts peak on Bird Termaline Relative Output Wattmeter/dummy load. Fuel your knowledge, unlock secrets, and engage in discussions. On ebay people often will tell you that the radio they are selling has had a swingIt's one of the most popular modifications to have done to your CB radio. I'm not volunteering. Then I ran across a receiver mod on eBay. Connect with CB radio enthusiasts at CB Radio Talk Forum. Jan 22, 2012 · the only mods done to the radio have been the Cobra 29 LTD super modulation modification mod. HELLO. Receive Diode Mod For Galaxy DX77HML : The 2030 final mod for the cobra 29: Milkman21218: 4 : 1 : 4-16-07 8:44 am: Power mod: Guardian: 1 : 1 : 4-15-07 8:54 pm Oct 22, 2015 · It can probably be done. had to throw them away. It powered up okay, the display only works on bright, but I didn't think it was a huge problem. 7K, but this is for a power regulator. Re-tune L14,L13,L12 for maximum forward power. that is a must do issue also. Aug 3, 2011 · I know the Cobra 29 Philippines model is supposed to sound great on the air, but what about the 148 Philippines model? Does it sound good on am like the 29? Also, is it stable in SSB?(at least better than Galaxy 959?) Aug 28, 2006 · Suits Cobra 146, Realistic TRC451, DSE Hornet 2, Uniden PC122 and AX144 etc Internal fit - undetectable when radio is turned off Gives 26. When I was finished ,the radio would key up but had no power. Then, I am to link wires from both sides of the 33 ohm resistor and run them back to COBRA CB RADIOS STAND THE TEST OF TIME Cobra 29 LTD CB radios are known for their performance, reliability, and durability and will provide you with years of reliable service. Thread starter Moleculo; Start date Dec 15, 2008; Receive mention alerts; Sound notifications. Long story short (IT DID NOT WORK). 2. Simple SPST switch or existing Jan 31, 2015 · www. Not the best for the "Swing mod" 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 - like you're eating the microphone. S Volted 29 does not do no more than 25 watts ! THE "V-MOD" KIT. According to the schematic from CBtricks I saved, it looks like the driver, TR8, is a 1957. Build quality was not that great though, controls felt cheap and loose and had quiet TX audio. Cobra® has taken all the great features of the "Classic 29LTD" and managed to enhance it even further! The 29 LX has the same size case and uses the same accessories as a "Classic 29LTD". by Need to unlock delta tune on Cobra 29. COBRA 25/29 & UNIDEN PC66/68 MODULATION SWING MOD KIT & RECEIVE MOD KIT COMBO. Cobra 2000's or Ranger/Galaxy have a separate modulator for transmit which makes them easier to inject. Very little has changed about this radio over the years. Now you can get this classic CB with dual-mode AM/FM functionality so you'll have clearer sound with less background noise. SheepDog. 5 volts. Professional driver-requested improvements include a front panel microphone connector (for convenient in-dash installation), a 9-foot microphone cord (for easy reach anywhere within the cab), and tactile controls (for added convenience and safety when Dec 15, 2008 · Cobra 89XLR MOD 2sc1969 and 2166 Installation. Dec 6, 2012 · Ok, the reason that the recieve comes on with the talkback is because when you short the two negative contacts on the EXT SPKR and PA jacks, it causes the radio to think there is a recieve line attached. 2uF mylar or non-polarized electrolytic View and Download Cobra 29 LTD ST service manual online. Also I want to mod one for the fun of it and choosing a model that has a frequency counter. All 25 & 29 Models. Out of the box , dead key was 3. just wondering which transistor and diodes to replace. Might be with the current pll on board. After pairing your smartphone, you can make and receive hands-free phone calls and text messages, and integrate the CB radio with the Cobra iRadar app for live notifications from other iRadar users, as well as report the same on the CB Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews. Dec 7, 2008 · TGIF to all has anybody tried or done the swing mod from the cobra 29 to cobra 2000 gtl or 148 curiosity is sitting on my right shoulder while on my left shoulder is saying get off the meds LOL i might just give this a try this weekend looking for input. Jun 20, 2007 · I used a 29 LTD Classic faceplate until I make one for my specific radio which happens to be a 29 LTD WX. 99 S&H per shipment Full Kit: receive your scale model in one shipment of $1,099. This will also happen on the cobra 29, 148, 2000, ect. The new radios are all going surface mount with no adjustments on the board, all you can do is talk on it. 5v if ok May 7, 2005 · place a 2200 ohm (red, red, red) resistor across the middle pin of the pa jack and the middle pin of the external speaker jack. com 50-Radio-mods, cobra 2000 gtl swing mod, palomar 450v, powered by vBulletin cb radio modification, astatic road devil mods, cobra 29 ltd classic light mods, http:www. Apr 21, 2012 · cobra 29 receive mod, cobra 29 receive mods, cobra 29 diodes for receive mod, 2sc2999e and dode mod for cobra 29, cobra 29 mods, improving cobra 29 receive mod, cobra mods, cobra 148 receive mods, powered by vBulletin cb radio modification, schottkey recieve mod, recieve mod for cobra 29, schottky cobra 29, cobra 29 home made, how to do Features. Mod. 5 watts swinging to 5. 2uF non-polarized electrolytics Transmit: Change C68 to a 1. After doing modification, output is now 1. Apr 3, 2005 · This is something I have been wanting to know for a while. What is it? I have a stock Cobra 29 WX NW ST that I was thinking of doing the swing mod to also. Long-Term Coverage is Available. Sep 23, 2021 · I see mentioned many times about adding low channels to the cobra 29s with out an expo kit or xtals. cause i cant seem to find where or why it is doing it thanks for the help and ideas on where to start May 18, 2005 · i went ahead and removed the resistor added to d17 but this did not bring the dead key back up. Here are a couple of known Bugs in the 858 SSB Chassis: Dec 18, 2008 · 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 the pot and soldering them together. We take an AM only radio that uses a modulation transformer, remove it, and install a darlington configuration (similar to the Cobra 148) in its place. (Will not fit the Cobra 25/Uniden PC66, 76, AX711 with the TC9106 or 9109 or other units that use the Apr 25, 2012 · New 2010/2011 Cobra 29LTD (TDA2003 audio chip) Receive: Remove C170 Change C33 and C40 to 2. comforums50-Radio-mods, cobra 29 ltd classic mods, Cobra 148 NPC mod, hr2510 swing mod, cb radio mods, hr2510 mods, cobra 2000 gtl mods, rci 2950 Nov 1, 2004 · Cobra 29 LTD: Receive Boost: Locate pin 14 of the PLL chip, and the Positive (+) side of C-12. See Attachment I recommend, to get your radios receive back - buy and install a 2SC1674 and replace the 2999 with it. If you were building a 29 to be the ultimate 29 and drive a tube box WHAT WOULD YOU DO? External switches are ok. htm The needle on the meter will The Cobra 29 LTD Classic CB radio has been the standard of excellence in professional CB radios for over 50 years. The Cobra 29 LTD NW CB radio adds NightWatch illumination to the 29 LTD Classic platform for enhanced safety and convenience. The Master Mod Upgrade Kit contains everything you need in one project package to update an old radio or give a fresh start to the new one. Jul 6, 2014 · Hi all, I am sure this has been asked before but I have a Cobra 139XLR (D858 chip), receive seems "decent" but it is somewhat noisy and I know I can improve the receive. If you tap the top of the case it receives fine till it fades out again, anybody got any idea where to start to fix this. THANK'S IN ADVANCE SCOTT. Sales: 800-964-3138 Monday - Friday 8am - 9pm EST Saturday 9am - 5pm EST Customer Service: 800-543-1608 Contact Us Monday - Friday 9am - 5:30pm EST Apr 23, 2023 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Remember to subscribe !Give this a Thumbs Up if you like it, it helps to grow the channel, also please share the video with your friends to help the channel Nov 1, 2004 · Cobra 29 LTD: Receive Boost: Locate pin 14 of the PLL chip, and the Positive (+) side of C-12. 01uF ceramic capacitor from pin 10 of IC-4 to the speaker positive lead. Jun 8, 2009 · I got a Cobra 29 LTD Classic off of a friend of mine. This removes the audio bandwidth restriction of the transformer, but it is only "half" of the mod. Clean and easily changed up to use the RF gain on the face is desired Join Date Aug 2012 Location Round Rock, TX Posts 394 Thanks 94 Thanked 196 Times in 100 Posts Downloads 7 Uploads 0 Oct 8, 2009 · I was thinking of doing this mod after reading that someone has done it. Trainwreck; Nov 1, 2012; 2 3. Cobra 29GTL, 29LTD and Uniden PC76 The PLL is not modifiable when used in an AM only radio, the only method that will allow more channels is to disconnect the 15. 5 Bluetooth Connectivity: When paired with the iRadar® app over Bluetooth, the Cobra 29 LX MAX provides real-time alerts to red light, speed camera, and law enforcement activity from a community of over 3 million drivers. 92 to 14. I've done it in several radios however I was told by a tech who shall remain nameless that it's a waste of time and doesn't do anything. Cobra HH33 this model is discontinued! Cobra HH34 Basic handheld with charging jack and lighter plug. JPG, DOC, TEXT, or HTML Formats. Maybe an echo boardreceive mods how about a "Top Gun" compressor? For this project money ain't really an object. Change C69 and C125 to . Cut the resistor out of circuit at the Dyna Boost switch. Good Luck and 73s. I think those are the best mods - so far. As far as the "other mods" R100 needs a 2. 0022uF (222) mylar to a 1uF-2. Oct 8, 2009 · What about this? :Receive Boost: Locate pin 14 of the PLL chip, and the Positive (+) side of C-12. i see it as it is cheaper than buying a It's one of the most popular modifications to have done to your CB radio. Equipped with various controls and buttons, this radio allows users to easily navigate and adjust its settings. 3k & the 1n4148 bias that Here is a very simple was to use 1 or 2 components to add super recieve boost to a Cobra 29 or Uniden PC78 CB radio. Must have figured it would sell better if the channel display on your Cobra 29 would read the same lower channels as your buddy's Galaxy. Cobra are a big name in CB Radio and have been offering quality rigs as far back as the 1960s! The radio we are reviewing here is the 29 LX and is based on the now legendary 29 LTD radio but with a modern facelift and some useful extra features. Right as rain now. After all, if it ain’t broke, don’t fix it. Nice little AM radio with no frills. Thanks Oct 26, 2016 · I have a somewhat newer 29 ltd classic, 2011 model. Dual-Mode AM/FM Newly Added! The Cobra 29 Chrome adds a chrome radio cabinet, chrome microphone, blue channel LEDs and signal strength meter. Excellent model Excellent appearance Great salon Good damage Realistic engine sound Working sensors The Cobra® 29 LTD Classic has been in production since the 1970s. I haven't done the frequency response boost on it - but that is next - I already have the parts for it. You can't just solder crap into a radio and tada it works great. All done. It is not an "amplifier" is a "final replacement" (with too damn many wires in the first place) Basically what the RFX75 unit does is take your stock finals out of line and replaces the stock finals with the mosfet finals that are in the RFX75 unit (ie May 20, 2019 · Hey gang, so I just got this cobra 29 wx st and noticed that it’s been peaked. The Bluetooth wireless connection allows text and caller ID information to show on the radio's display. com: Cobra 29 LTD Chrome AM/FM Professional CB Radio - Easy to Operate, Emergency Radio, Instant Channel 9, 4-Watt Output, Full 40 Channels, Adjustable Receiver and SWR Calibration, Chrome : Electronics Jul 7, 2006 · The next to try is the PA. Has anyone here done the 2sc2999 and Schottky diode swap on a cobra 29. I installed the components as instructed hoping to alleviate the garbled audio. 5 watts and swing to 7 watts. For the schottky diode mod you replace TR7 with 2SC2999 and then D5, D6, D24 with 1N6263 schottky diodes. Nov 8, 2017 · It's very simple for the Cobra 29. Had a receive mod and an audio kick kit as well. 965 TO 27. The meter is getting replaced and I don't have one yet. They put a disc capacitor in parallel with the lower-band crystal to pull it down from 14. Now I'm having trouble pulling a good swing pep beyond 7 watts. Last, you really have to know what your doing when you do these custom mods. The factory stock radio was 3. Rat , May 24, 2011 For over 50 years of excellence in the CB category, the Cobra 29 LTD Classic radio continues to be the radio standard of current and future professional drivers. I tested it a spare antenna and with my existing car rig (Cobra 19 + Wilson Antenna). That is because this is a radio that works. When I got it, it already had 80 extra channels put in it. this radio has been clipped as well and even though it has you must speak into the power mic pretty loud to get it to swing. There are alot of them out there that don't mention anything about cutting or removing the limiter. Mar 15, 2020 · I have found some different things listed for these, one is that you just replace the final with a 1969. 31] mod for BeamNG. I have a Taiwan model and I have acquired a phillipines model from eBay. Overview: The Cobra 29 LX MAX is a Citizens Band (CB) radio with Bluetooth-enabled smartphone features, making it ideal for the professional driver. Mike Possumz Mar 17, 2010 · Here is the receive mod for a Cobra 29GTL and original 29LTD chassis C33: Change from . It also features Instant Channel 9 and 19, adjustable Dynamike boost and Nov 5, 2004 · a stock 29 volted make's it get HOT and REAL HOT but with a few mods and a few bucks it can be done !!! but most people are into the export radios anymore so i have kinda lost touch on the tricks but i wil look up the mods for ya if you realy want to try it !!!! Allagator P. Join a vibrant community of like-minded individuals and explore the exciting realm of CB radios. Nov 21, 2006 · Cobra 29 LTD: Receive Boost: Locate pin 14 of the PLL chip, and the Positive (+) side of C-12. thanks CB Radio mods. Perhaps the most interesting recent model was the Cobra 29 with Bluetooth, but the one thing that hadn't changed with these radios for Cobra 29 LX LE CB Radio Review In the last couple of years Cobra has come out with a number new models that Apr 14, 2002 · I've done all of my own mods; but I am new and want to learn more. Cobra® 29 LTD Features Mar 30, 2019 · Your Hi Fi mods are the best! I've done the Cobra 29, 25, 148, 959 and every time I get compliments. Normal messages; Dec 31, 2007 · I recently modified my new Cobra 29 LTD Classic with the ERF-2030 final and EN-123 companion part with info obtained on ?CB Tricks? website. Use CARE when soldering to the Oct 1, 2011 · Go the new Cobra 29 LX was set to almost 4 watts and 70% mod. 91 MHz Cobra 29 Receive Mod Looks tight. 001uF disc Change C37 and C43 to . 005 % Page 21: Fcc Statement May 7, 2005 · As the title says I am installing the "super receive" mod in my Cobra 25. The front-panel control is powered in receive mode only. You need some basic skills, basic tools and basic understanding of electronic circuits. Small solder like . Use CARE when soldering to the PLL chip! If desired, this mod may be wired through a switch. Looking in the radio I seen this: D11-cut L14 slug- removed R55-cut R100- cut and a diode added. I dead key at 3. Mar 13, 2019 · First of all I want to say hey , I’ve just joined up. 2v to 0. 29 LTD ST transceiver pdf manual download. All you'll do is amplify the crap and make the signal to noise ratio worse actually making weaker signals harder to hear and increase bleedover from strong stations on nearby channels. From 0-max dead key. So, I want to try it with my 25. So if you want to do some mods, here is what I do to for the 29. To get talkback, install a . The mod is simple. com: Cobra 29 LTD Classic AM/FM Professional CB Radio - Easy to Operate, Emergency Radio, Instant Channel 9, 4-Watt Output, Full 40 Channels, Adjustable Receiver and SWR Calibration, Black : Electronics Feb 9, 2022 · 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. I had no deadkey or swing after I repaced A quick way to lower your dead key on a Cobra 29 will work on all Cobra 29 radio's Working on your own CB - adjusting the modulation ** Warning performing modifications on a CB radio can be a violation of FCC regulations. Apr 9, 2017 · Works on all cobra 29 radios, ltd and up. Internally, the 29 LX is based on the classic 29 LTD with some new added features. This websiteWorking on your own CB - adjusting the modulation ** Warning performing Cobra 25 JP6 L11 Cobra 29 JP36 L15 Uniden 68 JV17 L11 Uniden 78 JV101 L15 Jumper & Coil Part Number Notes: Drill a hole in the back or side of the radio to mount the Variable Power Pot. The final transistors are no longer available and in many cases the driver transistors are also obsolete. SKU: 3593632 Apr 5, 2005 · Does anyone know what this mod is for the Cobra 29 series. Cobra 140 GTL 142 GTL Remove and replace TR9 D1 D2 and D21 D22 Cobra 29 XLR Remove and replace TR1 D1 D2 and D2O D21 Uniden PC66 Also See Cobra Service Bulletins Page for other info. Try this,it is all I could find. It did 30-35 watts from a 2 watt carrier. Feb 17, 2014 · Here is the Cobra UK29 LTD ST Schematic View attachment Cobra_29_LTD_ST (1). The RX functions of the chip itself are locked out and not used. The Cobra 29 LTD Chrome CB radio has been the standard of excellence in professional CB radios for over 50 years. I'm wondering if I got a batch of bad IRF520's or is it that the IRF520 is not copatable with the 470ohm ,3. Would you have anything for the Alpha 10 Max Anytone AT-5555 Jun 11, 2011 · If you really want to do a mod I had Sparky cb do up a Cobra 25 with an IRF520 mosfet final. Mar 28, 2010 · 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. Plus like chassis such as the Cobra 1000 or President Dwight D Base radios. Master Mod Upgrade Kit Contains 1 each of the following: 1 - DM Variable Power Modulator Swing Kit 1 - DM Variable Back-Talk Kit 1 - DM RX Booster Kit w/ ON/OFF Apr 3, 2005 · Per @nomadradio - I - 2nd that - 100uF is the better of the two values. The thing I was wanting to know is is there something inside that Oct 8, 2009 · After doing the super modulation mod : http://cbradiomagazine. With dimensions of 184 x 235 x 57 millimeters and weighing 2540 grams, it has a compact and portable design. Cobra 29 LX LE CB Radio Review In the last couple of years Cobra has come out with a number new models that were variations of their famous Cobra 29 LTD. Cobra 2010 (Discontinued) The Cobra 2010 is Cobra's newest and best base station ever! POWER TWEAKS: Cobra 25 & 29 LTD This is a typical example of mis-information, the resistor changes listed below will not produce more power, they will make the radio sound crappie. 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-452 inside and out. Keyup and adjust L301, L302, L303, and L308 for maximum AM Modulation - RV201 FM Deviation - RV401. Aug 4, 2014 · Cobra 29 High Power mod with 2sc1969 transistor. Or can someone recommend a model that can be commonly found that is cheaper than a born 10 meter. Receive Modification Kit for Cobra, Uniden, Realistic, and more! COBRA 25/29 & UNIDEN PC66/68 MODULATION SWING MOD KIT Oct 8, 2009 · I have a stock Cobra 29 WX NW ST that I was thinking of doing the swing mod to also. Some prefer removing a less used control knob and mounting the pot there. I WOULD LIKE TO SEE THE PROCEEDURE FOR INSTALLING 1969 AND 2166 IN COBRA 89XLR AND WHAT COMPONENTS TO CHANGE TO GET THE BEST PERFORMANCE. Very disipointed. Now, thanks to Cobra's leadership to enable FM mode usage with CBs used in the United States and Canada, you can enjoy dual-mode AM/FM functionality in your CB. 360 Mhz signal that is coming from a tripler circuit and replace it with another one depending on the required freq. Jan 11, 2008 · Cobra 29 GTL LTD ST WX Remove and replace TR7 D5 D6 and D24 Cobra 148 GTL OLD Remove and replace TR14 D1 D2 and D21 D22 Swap T14 and move the transistor that came out of T14 to T19 for SSB receive. Apr 21, 2012 · The mod works well. Oct 8, 2009 · Will this mod work?: Receive Boost: Locate pin 14 of the PLL chip, and the Positive (+) side of C-12. There are several variations of the 29, but the classic keeps on going. While COBRA is temporary, in most circumstances, you can stay on COBRA for 18 to 36 months. com 50520210. Normal messages The 29 LX’s large center scroll knob provides simple one-touch programming of the unit for easy setup and channel changes. ( not 26 watts, must be a swing kit or something? on youtube See what happens when the skip quiets down for some radio checks Cobra nailed it with this model and recently made the only update to this 30-year-old legend by adding FM. Durable, reliable, and full-featured, you'll get clear CB communication on the road with 4 Watts of power, 40 channels, and new dual-mode AM/FM functionality. I know motor mouth has the 148 mods on his website but I can't find anything for the 29s. The Cobra 29 LTD Classic CB radio has been the standard of excellence in professional CB radios for over 50 years. Mod Boost: Power: 7 PLUS: VR4 or CUT D8: L11, L12, L13 29 GTL: VR4 or Apr 14, 2002 · Cobra 25 & Uniden 76 mod is similar, although you'll need to cross reference against the schematic. You'll often hear people say on the radio that Mar 3, 2013 · 29LTD CLASSIC Stock final swing kit,blue display,receive upgrade Feb 15, 2016 · Wabi-Sabi is just a pet-name for the AM regulator conversion with supporting mods. This page is being updated with more kits. 3 [0. I have a signal generator, VTVM, and solder/desolder equipment so any information would be great. 73's poboy Oct 6, 2011 · It had a bad protection diode (D17), receive need some peaking, meter adjustment on RX, turned up the mod a tad, and it was off freq a little bit. Use CARE when soldering to the PLL May 27, 2008 · MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 1 of 2 Receive mention alerts; Sound notifications. I tested the 1969 before installing, and it showed a Hfe of 143. Those were made for only one model year that I know, 1978. Can anyone tell me what to align for receive or perhaps some simple mods. I will later do the swing mod and post pictures. THEN SHORT BASE TO COLLECTOR PADS TOGETHER (form a solder bridged short) - the rest of the output then goes thru the tank circuit into the output network - you're running the radio on the Mar 17, 2017 · Quick video showing how I did the variable carrier/ dead key mod on a Cobra 29 CB Radio. this mod will give you a variable dead key using VR4, the modulation adjustment VR. One-touch Bluetooth can also be used to send and receive calls and texts completely hands-free. cut D11 or adjust VR4 (mod) (I am not cutting D11) adjust L14, L13, L12 Receive mention alerts; Sound notifications. should be about 3. Jun 29, 2016 · what is the voltages going into the gates of the fet. Jul 14, 2011 · Does anyone know what this mod is for the Cobra 29 series. cbjunkies. Use CARE when soldering to the PLL chip! Back by popular demand. (12 volts reference here is "battery power supply level) Apr 8, 2006 · Cobra 29 LTD Classic. Mike Gain minimum. Model COBRA Notice Revised. These mods will take you step by step to upgrade your CB radio. Do NOT use a large gun. Apr 3, 2005 · 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 Power available to use, with audio - you still have that 12 volts - but audio is ADDED. For Cobra 29 & Uniden 76/78 Units ONLY. This circuit May 27, 2013 · Got a cobra 29 with very little to no receive. The best thing to make noticed with this mod is when you have the radio installed in my car. 2uF mylar or non-polarized electrolytic C40: Change from . Attach the negative leg to the can adjacent to D18. I bought some a couple years ago that were not very good and only got about 6 watts out of them . Remove R56 and in its place install a 470-ohm resistor in series with a common switching diode (1n914 or similar), with the banded end of the diode towards the front of the radio. Cobra® is so confident in these radios, they offer a 2 year warranty for them. Parts + tools required: CB radio (duh) Soldering pencil 15-40w. Apr 6, 2005 · 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 mod is then applied. 5 or 2. May 24, 2011 · Do a quick google search on cobra 29 mods or cobra 25 mods. all voltage on new chip is ok pin 4 of chip. I can buy a big radio. Jul 1, 2006 · I recently picked up a cobra 29 for 20 dollars from a co-worker. 405 MHZ most ad vanced AM two-way radios used as a Class WX - 162. The Cobra 29 receives very poorly. But first someone would need to "translate" the procedure for later "29" radio models, and write directions with the exact part locations where connections get changed for the circuit board layout in the XLR model. 605 to 28. Mike Even if your enrollment is delayed, you will be covered by COBRA starting the day your prior coverage ended. 205 in 5 Khz steps with no gaps or skips When switched off, radio functions as a standard 40 channel unit Technician installation highly recommended Their words in purple above, not mine. But, no one stated how to perform the mod- go figure. 2K or 2. I have a Vietnam made cobra 29 Ltd classic. Every post I've read about the modulation adjustment tells you to turn vr4 all the way up counter clockwise, problem is my radio has no VR4. Mike Possumz Jan 11, 2008 · Cobra 29 recieve mod. 1uF mylar I did this mod on my 29lx and the receive is awesome May 18, 2022 · The 29 is thankfully an older through hole parts design, easy to modify and play with. 775 MHZ FREQUENCY TOLERANCE 0. Mar 26, 2007 · The most you are ever going to see out of a Cobra 29 with a RFX75 is about 55-60 watts, you have to first understand "what" the RFX75 is. 5 watts dead key with swing peak 5. It was a butt kicker. Would anyone have the info or directions on doing this mod for low channels. I have realignment the S-meter with an rf-generator and the receive. by It's just the design of the radio. I am talking about the recieve mod where one gets better lows and some highs on the receive end not the transmit end. Change R123(1 ohm) to a . It also receives NOAA weather and emergency alerts, does weather scans and alert scans, and has a radio check feature that runs diagnostics for RF power, vehicle voltage, and antenna SWR status. it appears there are more than two The 29 LX is the permanent replacement for the limited edition radio (20,000 Units Built) celebrating Cobra's 50th anniversary. I hope this helps. Please excuse the appearance. 29 LX Specifications GENERAL CHANNELS CB - 40 CH The Cobra 29 LX transceiver represents one of the FREQUENCY RANGE CB - 26. I have put in the super receive kit and the swing mod on my Cobra 29LTD. If you want to increase the modulation, you can also increase VR4, Cobra 25 low receive. You will receive a notice from your employer with information about deadlines for enrollment. Mar 1, 2024 · Download Ford SVT Cobra V1. dpd ipqeyuv hpxbi unqu sad gpgtn enfi bnsvtp ovjgfp accal