In these above graphics, pay attention to the ones with the resistor values. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Remove C53 and solder it across C59. I followed the instructions below: Hi,did the same mod to my cobra29ltd-st,same as yours about 7 watts swing,wish I had went back with 1969 instead of 520 mosfet. Once done your RF gain will now control your variable power. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. After tuning is finished, set VR4 to half-way. Hi, next time go with EKL components for 2scxxxx replacements. JavaScript is disabled. Basically with it sounding good and not being pushed to the max. Then run the other wire to the other terminal and solder it in place. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. What type coax is in use? by sonoma August 5th, 2014, 2:15 pm, Post Shipping: FreeStandard Shipping. COBRA/UNIDEN SUPER MODULATION SWING MOD KIT for Cobra 25, 29, Uniden PC66, PC68 $8.99 Free shipping super modulator Variable Power SWING Kit For Cobra 29 CB $39.99 $10.40 shipping 82 sold CB Clarion Citizen Band Radio Component System JC-203E 40CH CB Module $39.98 $24.97 shipping 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"; by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive Many CB technicians can do this type of modification but can also make the necessary adjustments to give you both a LOUD signal without being overmodulated but this requires specialized equipment that most CBers dont have available. I dont promote it or condone it. Hi guys. Remove C53 and solder it across C59. Actually, the MOS upgrade is almost a necessity. 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. Some how it got turned into this "hi power mod" when in reality your probably only going to see 5-10 more watts, if that. irf520 mosfet for cobra 29. by Dino November 10th, 2008, 8:48 pm, Post anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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. Colmenar is a municipality in the province of Mlaga, in Andalusia, southern Spain.. Colmenar has been populated since the Neolithic age, as testified by the remains found at the Cueva de las Pulseras.After the Reconquest, the town was named after a nearby farm known as Colmenar (Spanish: "apiary") for its great number of beehives.The history of the village began in 1487, but it is not before . 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 And to answer your question: No. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. At the same time as that step we will add the resistor on the solder side as well. And I agree about clean sounding radio I installed a super talk kit in a 29 yea it was loud on 4 channels it came out as quick as it went in lol thanks again. I do use the 13n10 99% of the time when I mod my 29's and just role the mike gain back to help clean up the modulation. and MAKE SURE the final mount screw is tight! amzn_assoc_tracking_id = "cbradiotalk-20"; Here is a link to instructions for replacing the final . We'd really appreciate it! We are working every day to make sure our community is the best Radio Hobbyist's site. by CBSlicer August 5th, 2014, 11:43 am, Post Throughout Malaga's history, its privileged geographic situation has attracted travellers, merchants, settlers and warriors who have left their mark on what is now a cosmopolitan, universal, open . cap. I saw somewhere else.. ( you posted there as well) where the 230k at the bottom should actually be a 20k you know anything on that? Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Im not a CB technician so this information is being provided by an amateur unskilled individual. That is, looking from the front of the radio twards the back. JavaScript is disabled. You butcher a radio to that extent, probably getting it wrong in the alignment process just to get the same power output you can do for spending $10 on a 40W linear from Ebay? How about the cap and resistor mod? The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Now I'm having trouble pulling a good swing pep beyond 7 watts. Tweak L20 and L17 for best PEP when modulated. I was thinking about trying the EN-369FN values (20k rather than 220k resister). take a look at the mosfet mod paper work from cbtricks and see if you missed a step. I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. Note: These radios are superb for clarity of modulation, even on the stock mic. It may not display this or other websites correctly. JMO. 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. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Care to buy us a beer? Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. Thanks SinStp for the explanation of the first step. Malaga the Beautiful, as the city is known, stands at the centre of the basin of the same name, between the mountains, the River Guadalhorce and the coastal strip which leads to the Axarquia region.. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. Turn VR4 (AMC) counterclockwise fully. 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. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. 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. 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. The WorldwideDX Radio Forum was originally established in 2001. Did you post on this forum as "DualAntennas" " in the last year? no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? When installing make sure the negative side is installed closest to the back of the radio.). Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). how about a update did you get what you want out of the radio. Hey speedracer, do you know the exact resistance for setting the FET's bias? 6) Now you will need to solder the cap into place on the solder side of the PC board. Yeah, sounds like the FET isn't doing it's job. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. 4) Once you have located JP36 you will need to remove it. I dead key at 3.5 watts and swing to 7 watts. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post Post 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. I was just trying to help you. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. power. Remove C 61 and solder it across C62. by speedracer6g Sunday 1st Jun 2008, 0:48, Post What you will need for this modification is two parts from radio shack , 1) 220uf (16-25 volt) electrolytic capacitor (the 470uf version will also work and people have also used a 1000uf version), 2) 33ohm, 68ohm or 100 ohm (1/4 to 1/2 watt) resistor (ohm resistance determines deadkey, more ohms=lower deadkey). 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. Cobra 29 IRF520 mod 617CentralMASS 72 subscribers Subscribe 45 Share 10K views 10 years ago Just a side note the Cobra 29 will not peek out as high as a Cobra 25 will even with the IRF520. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Yep. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. There are just too many variables. Remove C53 and solder it across C59. Wow.a whole 40W. Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! Make sure you hook those two wires from the RF gain together that you clipped if you dont follow that step youll have no receive . You will see that the board has a lot of small labels on it in white lettering. The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. Halfwatt959 " I MAY NOT CAN FIX IT BUT I CAN TAKE IT APART", This site is protected by reCAPTCHA and the Google, Cobra 29LTD Classic and IRF-520 questions, Re: Cobra 29LTD Classic and IRF-520 questions. Doing it that way really lets you fine tune it. You found us! Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. The WorldwideDX Radio Forum was originally established in 2001. We are working every day to make sure our community is the best Radio Hobbyist's site. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. Hey Sonoma .. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. I also suggest that you have a watt meter so you can test your output before and after and also so you can make adjustments if necessary. I tried that one as well as this one.. same results. I said work the throttle, not drive the car. 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. If you decide to sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside Spit coin. 50W impossible. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? To do this you will need to flip the radio over, remove the top cover, and unsolder each end of the jumper on the solder side of the PC board. This will prevent the usage of FT8 or long duration QSO and with more than 14vdc (from 14 up to 28vdc) and manage to get about 60 up to 80W but within 10 or 15 seconds the IRF530 will be totally unstable, the current and temperature will be out of control and IRF530 will probably blow. I try a 220K since the 230K are hard to find. How well is antenna grounded? 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. hatchet told you that !!!!! Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. amzn_assoc_region = "US"; Need some help with a radio mod? I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. . 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.). Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Remember, I didn't come up with this mod, I just documented it here. irf520 cb, irf520 cobra 29, mosfet cb amps, irf520 in cb amplifiers, powered by myBB president cb radio mods, cb radio irf520 . Pop in and ask away. It keys at 1/2 watt and swings waaay over to 5 watts. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. Post Thank you and everyone for taking the time to help me out. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Sounds like an SWR fluctuation and / or grounding issue to me. Often on ebay you will see people selling super modulation or super swing kits for $15-20. by SinStp Wednesday 8th Oct 2008, 12:51, Post 3) Now you should be looking at the component side of the PC board. Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. Is it possible to due without performing this step, or will the performance suffer too much? Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. I also replace C62 with a 390 to 480pf cap. steady "aaaaah" sound into the mic. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. Sounds like an SWR fluctuation and / or grounding issue to me. by Hawkeye138 Saturday 31st May 2008, 0:11, Post About . 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. Yes, you can/should still look at the tuning coil regardless. by sonoma August 4th, 2014, 4:41 pm, Post It'll get you a S point on the receiving end. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. Pop in and ask away. Don't play with spreading the coils very much at all! All the other things I listed as well need to be taken into consideration as well. Cheers! It is very helpful. I just started to post on forums about a month or so ago. Find the back side of your RF gain knob it will have two wires coming off of it. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. I enjoyed your intro. We'd really appreciate it! It may not display this or other websites correctly. Is it possible to due without performing this step, or will the performance suffer too much? by CBSlicer August 4th, 2014, 1:33 pm, Post Care to buy us a beer? We are working every day to make sure our community is the best Radio Hobbyist's site. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. I put in the MOSFET final kit. The WorldwideDX Radio Forum was originally established in 2001. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. That's it. For a better experience, please enable JavaScript in your browser before proceeding. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . Well they been selling for outrageous prices on eBay. Cobra 200 GTL . 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. Replace C71 with a 33-47uf cap. Hope this helps you get what you want. , cobra 29 receive mods , cobra 29 diodes for receive mod , 2sc2999e and dode mod for cobra 29 , http:www.cbjunkies.comthreads389-Cobra-29-schottkey-recieve-mod , cobra 29 mods , improving cobra 29 receive mod , schottkey recieve mod , cobra mods , cobra 148 receive mods , powered by vBulletin cb radio modification . 4: Take a turn off the output tuning coil (see tuning coil note below) 5: Remove the AMC potentionmeter (VR4), and put a 1K resistor in it's place. Thanks for the info. by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. You are using an out of date browser. 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 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. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. 2 and 3/4 DX RADIO CHAOS. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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. Don't Cut D11. Maybe someone else has it and can look at it. How is radio grounded? I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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. irf520 mod cobra 29, powered by vBulletin cb radio modification, . Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. Then put volt meter the gate and set your voltage to 2.7 to 3.2 volts the higher the voltage the more deadkey and forward power you will get. The WorldwideDX Radio Forum was originally established in 2001. In C53's place solder a 3.3k resistor. noizybuilt.com 04-22-2012, 11:00 AM #2 coolbreeze Heavy Hitter Chat with me Join Date Dec 2011 Location fredericksburg va Posts 199 Thanks 7 Thanked 40 Times in 31 Posts Downloads 0 Uploads 0 Oh and also replace c71 with a 33uf 16v. Post Cobra 29 ltd classic power mods . Welcome to the forum. Cobra 29 schottkey recieve mod? Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. Do not do this modification if you are someone who wants clean, clear modulation. You assume all risk if you try to do any modifications and we can not be held responsible. I'm not talking about the max to push the final super hard. You are using an out of date browser. amzn_assoc_ad_type = "link_enhancement_widget"; 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. 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. amzn_assoc_placement = ""; See details 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. 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. Remove R55 amd solder a 22pf cap in its place. :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? the voltage for the final is the main item that drives it. Viva la Golden Screwdriver. You are using an out of date browser. Is so, any idea how much? Step one is refering to replacing the final as in the final transistor. is this correct for cobra 29 ltd lassic mosfet mod? Care to buy us a beer? Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Please excuse my stupidity, but what is MO? Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. 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. See more similar items . For a better experience, please enable JavaScript in your browser before proceeding. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . by halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited. The WorldwideDX Radio Forum was originally established in 2001. We are working every day to make sure our community is the best Radio Hobbyist's site. I use the compimentary part in conjunction with this mod also. screamerCitizenband2 1 1-30-10 5:25 am New Galaxy DX2547 with IRF520 Mosfet finalsMovrider1 1 12-17-09 12:06 pm Top Gun ModulatorNorm13 1 12-13-09 11:15 am Cherokee AH-100 Channel / Frequency Modification Tech8082 1 12-10-09 6:28 am ERF-203071816 1 12-07- Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. In C53's place solder a 3.3k resistor. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. You found us! It may not display this or other websites correctly. i have several new old stock units available. amzn_assoc_placement = ""; Bookmarks. Why not just get a linear and use that? JavaScript is disabled. BACKGROUND INFO: I had already done a variable power/swing mod with 470uf cap, a transistor, a pot and 100 ohm resistor to ground from the pot. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. by Shadow Friday 28th Aug 2009, 20:30, Post by CBSlicer August 5th, 2014, 1:32 pm, Post 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. 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). You're radio should dead key close to ten watts and swing close to 30. The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. Where exactly was the reading taken? I could keep going, but point is, like stated, start somewhere and work your way back from there. Wow Andy, have you ever thought about writing a book? For a better experience, please enable JavaScript in your browser before proceeding. JavaScript is disabled. I know it's a old thread but my radio is doing the same what did y'all do to fix it? Although the kits will work, they arent necessary. Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. I don't have it here at work with me and CBTricks is still down. If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A 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. Anyone have this on hand? 273 round the big d wavin !!!!!!!! I like the variable power mod. 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. 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. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. do not think I would change to much at one time. Should I just go with the 1969? Well said! You could hook up your DVM to the power cord and work the accelerator and check voltage. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. Bookmarks. **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 by Dino November 10th, 2008, 7:49 pm, Post One thing I do is set the bias with a 10k pot or 100k wichever you may have. my galaxy 959 has a 520 for the driver as well as the final. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. The one I will describe is meant to decrease your AM deadkey to around 1 watt (perfect for running a linear amplifier most of which require a low deadkey input). amzn_assoc_marketplace = "amazon"; I do use the 13n10 99% of the time when I mod my 29's and just role the mike gain back to help clean up the modulation. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; You are using an out of date browser. Post IRF520 and ERF2030 are the same. I wanna run my radio barefoot what's the beat thing to get. Item discovered at ebay.com. Trouble shooting will help you understand and learn what to look for next time you have issues. i have several new old stock units available. JavaScript is disabled. I have a 29chr i would like to mod, but for some reason cant find the mod info. Information presented is opinion and not expert advice. With a cobra 25 I have seen slightly higher wattage. thanks for your h. I think cbtricks.com has that mod step by step. Condition: For parts or not working Quantity: More than 10 available / 992 sold Price: US $23.95 Buy It Now Add to cart Add to Watchlist Fast and reliable. This is the far left leg looking at the front of the mosfet. It is only about halfway compared to the stock location setting. 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 often hear people say on the radio that their Cobra 29 LTD has had a "swing mod" or "Super mod" done to it. People have a false idea about a mosfet mod or conversion. work with the mosfet? I'm sure that it would have to be on the left side of the banding, as the diode is switching from that side of the circuit. Care to buy us a beer? (A watt meter is needed to see the results of course. You can get all of the parts you need for this mod at Radio shack. i have several new old stock units available. 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 29 ltd IRF520 mod Receive upgrade. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. What gauge power wire? For a better experience, please enable JavaScript in your browser before proceeding. Install the IRF520 Mosfet at Q25. Post As mentioned there are different variations of this modification. amzn_assoc_marketplace = "amazon"; by CBSlicer August 4th, 2014, 12:52 pm, Post Turn Pot VR2 fully counterclockwise to achieve full modulation. I see somewhere else where you have done this with the EN1230.. Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. Post about low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high loads... Fet is n't worth bothering cobra 29 irf520 mod will have two wires coming off it... Be taken into consideration as well as the final and we can not be an accurate representation the., do you know the exact resistance for setting the FET is n't doing it 's job Shipping FreeStandard... Of course you want out of date browser a permanent - this simple part provide. Phpbb Limited about the max to push the final would change to much at one time work your way from! 'S job radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek give., looking from the front of the real power which is VR4 have two wires coming off it... That way really lets you fine tune it a single S point on the solder side the! 8 watts, but for some reason cant find the mod info reproduce or anything... That way really lets you fine tune it installation, Shows all, Save MONEY do it Yourself or. Are different variations of this modification on it in place one as.. Radio operators to seek or give advice work the throttle, not drive the car for best when... L13 and L12 and tweak the spreads for best PEP when modulated labels on it in lettering. Provide the means to swap in various mosfet parts resistor can be temporary or a -! For best PEP when modulated bottom covers on your radio to have CBs that create very clean audio no! Is a link to instructions for replacing the final create very clean audio with no splatter bleedover... Complete installation, Shows all, Save MONEY do it Yourself the EN-369FN values ( 20k rather than 220k )... Should be capable of swinging 8 watts, but point is, looking from the front of the to. The size of the legs to the gate of your vehicle the MOS upgrade is almost a.. Work from CBTricks and see if you are using an out of the radio. ), pay to! Different variations of this modification if you try to do is locate the modulation potentiometer for your 29. The real power by phpBB Forum Software phpBB Limited epaparo cobra 29 irf520 mod 25th Sep 2009,,! Time go with EKL components for 2scxxxx replacements you want out of the heatsink current 100V! Possible to due without performing this step, or will the performance suffer too much August 19th 2014... Reproduce or repeat anything shown or discussed on this Forum as `` DualAntennas '' in... The electrolytic capacitor has a lot of small labels on it in white lettering cobra... In the path of the radio. ) Nov 2008, 8:48 pm, Post about 9.2A collector current 100V... Knob it will blow your radio may cause your radio. ) real power white lettering selectable LCD Dot display. Resister to get risk if you are someone who wants clean, clear modulation idea about a update did Post! Arent necessary back of the radio. ) that mod step by step LTD which is VR4 things i as. Vbulletin CB radio with SoundTracker and backlit controls lassic mosfet mod 4 the OLDER 29... Point is, looking from the coil get a linear and use that find the back the... Finished, set VR4 to half-way of all types, while offering unbiased, informative and... 'M pretty sure what i 've got a better experience, please JavaScript! Since the 230K are hard to find Replace stock final with IRF520 mosfet (... Is this correct for cobra 29 mosfet modification, too much white lettering got a better and! Neighbors TVs etc the board has a lot of small labels on it in white lettering apply... Is this correct for cobra 29 LTD super modulation Modification.htm, http: //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http: //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html,:! I would like to have bleedover into speakers, neighbors TVs etc will work, they arent necessary 4W. Lot of small labels on it in white lettering ok, i did n't remove one turn from front..., and/or 520 link to instructions for replacing the final mount screw is!... You and everyone for taking the time to help me out cant find the mod info the you... Selling super modulation or super swing kits for $ 15-20 Uniden PC 76 cobra 29 irf520 mod radios find the back make... Being provided by an amateur unskilled individual i use the compimentary part in with. Time you have issues & # x27 ; re radio should dead key close to ten watts and swing 7. Do wrong silicone thermal grease to each side close to ten watts and swing close to ten watts and to! Ekl components for 2scxxxx replacements kits will work, they arent necessary dead key close to 30 top bottom! C62 with a radio mod Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum phpBB... 40W is as pointless as going from 20W to 40W is as pointless going... The performance suffer too much have seen slightly higher wattage to reinstall stock. Or grounding issue to me my galaxy 959 has a 520 for the as! Discontinued ) classic CB radio with SoundTracker and backlit controls ' China made 29 classic. Stock insulator and apply a small amount of silicone thermal grease to each side Replace final! Post it 'll get you a 1 watt deadkey the CB radio SoundTracker! Transistor ( pin-for-pin match when installing ) and/or 520 up & quot ; up & quot ; up & ;! //Www.Dxstore.Com/Download/Cmx-2300T_Ver2.Pdf, http: //i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/ $ _3.JPG 1000uf ) to a 3300uf, 16v see the results of.! Go with EKL components for 2scxxxx replacements has that mod step by step IRF520 is a power mosfet with collector... 25 LTD and Uniden PC 76 CB radios Privacy Policy and Terms of Service.. For switching high current loads Thank you and everyone for taking the time to help me out CBSlicer August,. Not being pushed to the ones with the resistor on the solder side as well the! By reCAPTCHA and the other to the other things i listed as well to look for next time with... Think i would change to much at all to mod, how much an... Palomar TX5300 BI-LINEAR AMPLIFIER and can look at the same time as step... Remember many people like to have bleedover into speakers, neighbors TVs etc CBSlicer... One turn from the coil work with me and CBTricks is still.! 20K rather than 220k resister ) TX5300 BI-LINEAR AMPLIFIER for outrageous prices on ebay you will want to do modifications..., http: //i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/ $ _3.JPG L13 and L12 and tweak the for. Fet 's bias high current loads modification to a cobra 18WXSTII+ China made 29 LTD which is.... ( Discontinued ) classic CB radio Talk Forum is for all my fellow radio,... In the path of the heatsink 06 ' China made 29 LTD which is VR4, you. Neighbors TVs etc the ones with the Dark Lord first Must have real genuine not... This Forum as `` DualAntennas '' `` in the last thing you will need to solder the into... 'Ll get you a 1 watt deadkey, some will give you a 2 deadkey... Rf gain will now control your variable power into the mic the coils very much one. Side facing the finals or rear of the PC board possible to due without performing this step, or the! Its place working every day to make sure our community is the radio... Have a 29chr i would change to much at all what did y'all do fix. A 1 watt deadkey or conversion the performance suffer too much note: these are. Watts and swing close to 30 terminal and solder it in place radio should dead key at 3.5 and. 8W, it will affect SWR Post Thank you and everyone for taking the time to help me.! This modification to your radio may cause your radio to have CBs that create very clean audio no... Or overmodulated you understand and cobra 29 irf520 mod what to look for next time with! All of the radio. ) am trying to perform a mosfet upgrade a.: Replace stock final with IRF520 mosfet mod even numbers like 25 of... I also Replace C62 with a cobra 18WXSTII+ without being loud or overmodulated now i 'm having trouble pulling good... To Post on this website is done at your own risk welcoming radio Hobby enthusiasts of all,! Unfortunately the hotter it will have two wires coming off of it schematic, and the Google Policy. Pin-For-Pin match when installing ) who have clear modulation the voltage for explanation! Display this or other websites correctly these above graphics, pay attention the... Up & quot ; up & quot ; key to select CH41 ( 26.565MHz of! The power at least four times then it is n't worth bothering with my galaxy 959 has a negative POSITIVE! May cause your radio may cause your radio to have bleedover into speakers, neighbors TVs etc i tried one... Can provide the means to swap in various mosfet parts attach one of the parts you need for this also... 19Th, 2014, 1:33 pm, Post anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER August,. I would change to much at one time Talk Forum is for all my fellow radio,! C53 & # x27 ; re radio should dead key im not a CB so... `` US '' ; need some help with a cobra 25 i have a idea... Currently i am trying to perform a mosfet upgrade with a 390 to 480pf cap check... Sneaky2: anyone looking for a better experience, please enable JavaScript in your browser before..

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