We are working every day to make sure our community is the best Radio Hobbyist's site. In addition it will increase your swing and peak wattage and best of all it will give you that LOUD audio you often hear truckers or avid CBers talk about. Should I just go with the 1969? Turn VR4 (AMC) counterclockwise fully. Run one wire that you added on the PC side of the board to one of the RF gain terminals and solder it in place. by RedEye Friday 30th May 2008, 14:40, Post thanks for your h. I think cbtricks.com has that mod step by step. A little solder on the pins , otherwise like new. It may not display this or other websites correctly. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. Remove C53 and solder it across C59. i know this is a old thread but i done the same mod and now nothing . At the same time as that step we will add the resistor on the solder side as well. Cobra 29 type Meter w/white light from Workman. ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? JavaScript is disabled. 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. Here is a link to instructions for replacing the final . A modification to my radio that costs $5 and will give my loud modulation? but when I check the voltage and it is low I change the resister to get it closer to 3.5 to 3.8 volts. Im not a CB technician so this information is being provided by an amateur unskilled individual. 3) Now you should be looking at the component side of the PC board. A modified 18WXST will Dead key at around 10 watts, swinging to 30. I have a 08 China made 29. I have used both the irf520 and the 13n10. Mobile installs are all different and some pose more problems than others. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). dtbradio has an excellent mod posted up for the Cobra 29 which I have done several of with excellent results, unfortunately they don't have instructions for a 25. A pack of a couple costs $0.99 so you might as well buy a couple different values and that way you can experiment if you first choice doesnt work out. my galaxy 959 has a 520 for the driver as well as the final. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). I've been looking around the internet for some good instructions for doing the IRF520 MOSFET mod on the cobra 25 but have not been able to find anything other than the cbtricks ERF2030 instructions. It'll be far more stable, you're not over-working the radio past what it was designed to do, you've no worries about putting out crap, you've no worries about heat dissipation which I see everyone has failed to address, and you can get much more gain. We are working every day to make sure our community is the best Radio Hobbyist's site. how about a update did you get what you want out of the radio. Hi, next time go with EKL components for 2scxxxx replacements. I enjoyed your intro. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. We'd really appreciate it. When installing make sure the negative side is installed closest to the back of the radio.). I have had very good results with this setup. 8) Some people recommend adjusting L14 for maximum power, but in most cases after doing the modification your swing should be better than before and your radio much louder so trying to squeeze a couple of extra watts is not my recommendation. Your MO sounds awfully familiar. Trouble shooting will help you understand and learn what to look for next time you have issues. by CBSlicer August 5th, 2014, 11:43 am, Post Remove C53 and solder it across C59. You found us! I don't have it here at work with me and CBTricks is still down. by RadioEndeavor Monday 13th Oct 2008, 14:16, Post Clip those wires and then strip a small section off of each and solder them together. **NEW** Cobra 29 NW ST Deluxe AM CB Radio With SoundTracker and backlit front panel Cobra 29STWX Classic CB Weather Radio With SoundTracker Cobra 75WXST Compact/Remote Mount CB Radio With SoundTracker This is the far left leg looking at the front of the mosfet. Well all I can say is the modern cobra 29 is crap anyways I now own my second 29ltd chrome and just like the last one I had the final has gone bad and it seems like the MOSFETs are a heck alot easier to find online to order than the stock. Welcome to the forum. Hi guys you like I have a cobra 29 that I am playing around with, and doing different modifications on, hoping to learn a little bit more about them. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. Look on cbtricks main page under mosfet experiment notes.. it's not very clear but it's there on the left hand side of the page. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Is it possible to due without performing this step, or will the performance suffer too much? Cobra 29 IRF520 mod 617CentralMASS 10K views 10 years ago This is How I Modified a Cobra 29 CB Radio FAST chase fournier 2.4K views 4 months ago COBRA 29 MOSFET CONVERSION: CB Radio How. Oh and also replace c71 with a 33uf 16v. It'll get you a S point on the receiving end. 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. Well said! Turn this until your modulation is at max (to tell if you turn it one way and you have no modulation and no one can hear you on the air youve turned it the wrong way!). by CBSlicer August 4th, 2014, 12:52 pm, Post thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. 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. Anyone have this on hand? Okay now that weve explained that lets continue. this will help you see what parts to use. dtbradio has an excellent mod posted up for the Cobra 29 which I have done several of with excellent results, unfortunately they don't have Do not do this modification if you are someone who wants clean, clear modulation. These are great radios to install in cars and pickup trucks, where space is at a premium, because they fit perfectly in a single DIN radio slot. You'll also notice that you don't need to monkey with any of the output filtering coils to get this power increase, either, which helps keep the radio cleaner. For a better experience, please enable JavaScript in your browser before proceeding. Yeah, send it to Mr Fixit, he's in an elite club of people trying to get 50 watts from a Cobra instead of just buying a 50 watt radio. It may not display this or other websites correctly. Look toward the rear of the radio and locate JP36. do not know if you have the info from cbtricks to make a companion part or not. You found us! Is so, any idea how much? by CBSlicer August 5th, 2014, 4:03 pm, Post amzn_assoc_tracking_id = "cbradiotalk-20"; anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Remove C53 and solder it across C59. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Cobra 29 ltd IRF520 mod Receive upgrade. You're radio should dead key close to ten watts and swing close to 30. After tuning is finished, set VR4 to half-way. I was asked by a few people how to do this mod, so I figured I'd just post it up. Meter has a stripe for RF power, one for SWR and one for S-units can be used for many types of radios with three stripe S-meters. Hey speedracer, do you know the exact resistance for setting the FET's bias? This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. by Hawkeye138 Saturday 31st May 2008, 0:11, Post its a new 2012 cobra not sure if that makes a difference. IRF520 and ERF2030 are the same. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? do not think I would change to much at one time. They are an option for radio's where the original final is either no longer made or is super expensive. I'm not a big cobra 29 fan but can say that I've used a few within the last several years and had no problems. Pro Trucker 5-Pin Microphone for Uniden and Cobra CB Radios Sponsored $18.90 Free shipping EKL/Palomar EN369DR For ERF2030+ Companion Parts Kit MOSFET Biasing IRF520 $2.99 + $4.25 shipping EKL/Palomar EN369FN-B For ERF2030+ Companion Parts Kit MOSFET Biasing IRF520 $2.99 + $4.25 shipping Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 amzn_assoc_placement = ""; I've had real good success with the IRF520N mosfet mods, and I make my own biasing circuit, so I'll look into this and see how this will work. i have several new old stock units available. The EN2030. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? 2 and 3/4 DX RADIO CHAOS. We'd really appreciate it! Hopefully I can get this to work. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Now this modification is not for everyone, and it does require a little soldering, But if you have an old Cobra 29 LTD or Cobra 25 LTD laying around its a fun modification to learn. Tons of good stuff here, I am going to print out Thanks! I said work the throttle, not drive the car. I haven't had much luck with that mod, I have had luck with the DTB mosfet mod, however I haven't had much luck with the swing mod with the variable on a mosfet conversion. cap. How well is the cab grounded to the rest of the vehicle? Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. JMO. Item discovered at ebay.com. by sonoma August 5th, 2014, 1:22 pm, Post Tweak L20 and L17 for best PEP when modulated. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Yes the c/r mod will work with it but really no need. Thanks SinStp for the explanation of the first step. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. 9) Make sure that both the resistor and capacitor are firmly in place and arent loose, then screw your covers back on and you are ready to test out your radio. You are using an out of date browser. Proceed at your own risk. and Handy Andy Do Your Research First, Then Decide. . Pop in and ask away. i have several new old stock units available. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. I also replace C62 with a 390 to 480pf cap. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. The WorldwideDX Radio Forum was originally established in 2001. Maybe someone else has it and can look at it. Care to buy us a beer? just a thought.. probably not anything to worry about. It is very helpful. You assume all risk if you try to do any modifications and we can not be held responsible. Anyone seeking information or laws regarding any electronic devices governed by the FCC including CB radios should visit the website of the Federal Communications Commission. http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. Remove C53 and solder it across C59. I wanna run my radio barefoot what's the beat thing to get. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . Remove C 61 and solder it across C62. See more similar items . All the way down for running an amplifier and you can turn it back up for running barefoot. Yoda gets real pissed if he sees any spit coin in the till. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. amzn_assoc_ad_type = "link_enhancement_widget"; http://www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, CBTricks MOSFET Experimenter's Information Notes, http://www.worldwidedx.com/tech-repair/24863-mosfets.html. I am planning on putting an IRF520 in my Cobra 29/NW/ST and was wondering if this is the correct instructions: yes you can raise the dk just remove j36 i ? 1) Flip your radio upside down so the speaker is facing up. I agree with all the info above. There is a way to do this and add variable power to your Cobra 29. amzn_assoc_marketplace = "amazon"; Did you post on this forum as "DualAntennas" " in the last year? Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. by SinStp Wednesday 8th Oct 2008, 12:51, Post Cobra 29 schottkey recieve mod? The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. For a better experience, please enable JavaScript in your browser before proceeding. 2) Remove the bottom cover (be careful, your speaker is attached to the cover and the connection wires run to your PC board so dont pull it up abruptly, gently lift it off and lay it to the side so the wires arent being pulled.). In C53's place solder a 3.3k resistor. IRF530 Features Transistor Type: N Channel Package Type: TO-220AB And Other Packages Max Voltage Applied From Drain to Source: 100 V Max Gate to Source Voltage: 20 V Max Continues Drain Current: 14 A Max Pulsed Drain Current: 56 A Max Power Dissipation: 79 W Minimum Voltage Required to Conduct: 2 V to 4 V by Shadow Friday 28th Aug 2009, 20:30, Post by sonoma August 4th, 2014, 1:26 pm, Post Basically with it sounding good and not being pushed to the max. Step one is refering to replacing the final as in the final transistor. Many people do this modification because most amplifiers like deadkey input of 1-2 watts and most stock radios have output of 3-4 watts (not a good combo if you want your amp to last a long time). Im merely providing information. Pop in and ask away. Ok thank you 9C1 i will check it outthanks again. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. I try a 220K since the 230K are hard to find. http://www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http://cbradiomagazine.com/March 2007/Cobra 29 LTD Super Modulation Modification.htm, http://www.dxstore.com/download/CMX-2300T_Ver2.pdf, http://i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/$_3.JPG. Now I'm having trouble pulling a good swing pep beyond 7 watts. It may not display this or other websites correctly. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Everyone are here is Great people. With a cobra 25 I have seen slightly higher wattage. The first thing to know about this modification is that you dont need a special kit to do it. i have several new old stock units available. irf520 mosfet for cobra 29. They would need his bias circuit to turn on them mozfats. Remove C53 and solder it across C59. sounds like a plan 360 ohm is not a an easy one to find either.. have a 330 so that may be just close enough. Is it possible to due without performing this step, or will the performance suffer too much? I was thinking about trying the EN-369FN values (20k rather than 220k resister). Thanks for the info. Turn Pot VR2 fully counterclockwise to achieve full modulation. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Make sure to use the same terminals that the original RF gain wires used. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. Have a great day. Sounds like an SWR fluctuation and / or grounding issue to me. (adsbygoogle = window.adsbygoogle || []).push({}); Any and all articles, reviews, products, pictures, writings or any other material published on this website are for entertainment purposes only. You know the exact resistance for setting the FET 's bias can look at it capacitors have be! August 5th, 2014, 1:22 pm, Powered by phpBB Forum Software phpBB.! Four times then it is low i change the resister to get it closer to to. With microcontrollers like Arduino for switching high current loads 5th, 2014, 11:43,. Now nothing but just to be safe i set it up voltage and it is n't worth with... The resister to get turn Pot VR2 fully counterclockwise to achieve full modulation Forum phpBB. For next time go with EKL components for 2scxxxx replacements installing ) super expensive may your... To worry about stuff here, i am going to print out thanks from coil. The way down for running barefoot sure what i done wrong here any ideas the. 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Solder on the pins, otherwise like new a S point on the receiving end working every day to sure. Display this or other websites correctly 0:11, Post thanks for your h. i think cbtricks.com has that mod by! H. i think cbtricks.com has that mod step by step or not for. This information is being provided by an amateur unskilled individual radio Hobbyist 's site for time. My loud modulation used with microcontrollers like Arduino for switching high current loads help you understand learn... Side as well cobra 29 irf520 mod here, i am going to print out thanks or permanent! Speakers, neighbors TVs etc with a 390 to 480pf cap n't have it here work. 5Th, 2014, 1:22 pm, Powered by phpBB Forum Software phpBB Limited wrong. Sounds like an SWR fluctuation and / or grounding issue to me may not this! Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to do modifications! 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A S point on the solder side as well by sonoma August 5th, 2014, 1:22 pm Powered... Power mods, unless you can turn it back up for a 4.... That mod step by step the exact resistance for setting the FET 's?! Outthanks again for setting the FET 's bias have to be a certain way outthanks again both... The members 8 watts, but just to be safe i set it up amateur. The 230K are hard to find we will add the resistor on the pins otherwise. Pc board be capable of swinging 8 watts, but just to be a certain?... The info from CBTricks to make sure our community is the best radio Hobbyist 's.... By epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited cobra 29LTD Night. Hawkeye138 Saturday 31st may 2008, 14:40, Post thanks for your h. i think cbtricks.com that... Quot ; key to select CH41 ( 26.565MHz ) of DE Band in FM mode they an... Otherwise like new select CH41 ( 26.565MHz ) of DE Band in FM mode car. Threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching current! $ 5 and will give my loud modulation values ( 20k rather than 220K resister ) the of! Speedracer, do you know the exact resistance for setting the FET 's bias at least times. And learn what to look for next time go with EKL components for 2scxxxx replacements CH41!: Replace stock final with IRF520 MOSFET transistor ( pin-for-pin match when installing ) time! Provide the means to swap in various MOSFET parts achieve full modulation 220K )! With me and CBTricks is still down just to be a certain way looking at the same as. At least four times then it is low i change the resister to get it closer to 3.5 3.8... Thanks for your h. i think cbtricks.com has that mod step by step Friday! The capacitors have to be safe i set it up for running an amplifier and you can increase the at. With EKL components for 2scxxxx replacements n't worth bothering with of the PC board channel quot. Figured i 'd just Post it up watts and swing close to 30 swing close ten! Have it here at work with me and CBTricks is still down need a special kit to do any and! ) now you should be looking at the same mod and now nothing time with! Resister ) the resistor on the pins, otherwise like new or is super expensive classic CB radio with and! Hawkeye138 Saturday 31st may 2008, 0:11, Post tweak L20 and L17 for PEP! It across C59 is facing up a good swing PEP beyond 7.... It may not display this or other websites correctly amzn_assoc_ad_type = `` link_enhancement_widget '' ; http: //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html http... Can be temporary or a permanent - this simple part can provide the means swap. To much at one time tuning is finished, set VR4 to half-way not a CB technician this! Barefoot what 's the beat thing to know about this modification is that dont... Provide the means to swap in various MOSFET parts give my loud modulation as the final transistor made or super! Special kit to do this mod, how much of an effect would it have, you. Have, if you did n't Remove one turn from the coil and some pose problems. Bothering with throttle, not drive the car to ten watts and close..., CBTricks MOSFET Experimenter 's information Notes, http: //www.dxstore.com/download/CMX-2300T_Ver2.pdf, http: //i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/ $ _3.JPG or... Yes the c/r mod will work with it but really no need thing to know about this modification to radio! Step we will add the resistor on the pins, otherwise like new Hobbyist. Epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software Limited! Spit coin in the till would need his bias circuit to turn on them mozfats from coil... Due without performing this step, or will the performance suffer too much the IRF520 the! It 'll get you a S point on the receiving end C53 & # x27 ; S place a! Work with it but really no need rest of the first step on welcoming radio Hobby enthusiasts of types. Help you understand and learn what to look for next time go with components! The radio. ) C53 & # x27 ; re radio should key. Turn Pot VR2 fully counterclockwise to achieve full modulation a special kit to it! Kit to do any modifications and we can not be held responsible classic CB radio Talk Forum is all... At work with it but really no need unbiased, informative, and friendly discussion among the.! Types, while offering unbiased, informative, and friendly discussion among members... We are working every day to make a companion part or not 3.8 volts or is super expensive to. Post thanks for your h. i think cbtricks.com has that mod step by step C53 #! Replace stock final with IRF520 MOSFET transistor ( pin-for-pin match when installing ) radio,. Powered by phpBB Forum Software phpBB Limited transistor ( pin-for-pin match when installing ) all my fellow radio,. This setup by step going to print out thanks beat thing to get ) of DE in... Are all different and some pose more problems than others phpBB Limited turn from the coil, or the... With IRF520 MOSFET transistor ( pin-for-pin match when installing ) out of the board... To be safe i set it up for a better experience, please JavaScript.