Replace C71 with a 33-47uf cap. Thank you and everyone for taking the time to help me out. Yeah, sounds like the FET isn't doing it's job. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. It is very helpful. 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. Wow! 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. I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. What I meant I guess is the max it will handle or be able to put out without any obvious stress being placed on it or pushing it extremely hard and without any sort of audio distortion. 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. Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. People have a false idea about a mosfet mod or conversion. Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. Now I'm having trouble pulling a good swing pep beyond 7 watts. Bookmarks. Is it possible to due without performing this step, or will the performance suffer too much? In addition I make no guarantee to the validity of any of this info. 3) Now you should be looking at the component side of the PC board. You are using an out of date browser. Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. And to answer your question: No. , 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 . do not think I would change to much at one time. 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. 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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). A forum to find other HAM / CB radio operators on-line? A forum to find other HAM / CB radio operators on-line? In C53's place solder a 3.3k resistor. 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). We'd really appreciate it! I know it's a old thread but my radio is doing the same what did y'all do to fix it? amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; Sounds like an SWR fluctuation and / or grounding issue to me. This Will clean up the amc circuit and make it work better. I have used both the irf520 and the 13n10. Cobra 29 ltd IRF520 mod Receive upgrade. All the other things I listed as well need to be taken into consideration as well. Im not a CB technician so this information is being provided by an amateur unskilled individual. i have several new old stock units available. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. 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. JavaScript is disabled. I see somewhere else where you have done this with the EN1230.. It keys at 1/2 watt and swings waaay over to 5 watts. . Cobra 29 ltd IRF520 mod Receive upgrade. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. I have a 08 China made 29. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. 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 ? I try a 220K since the 230K are hard to find. There are just too many variables. Item discovered at ebay.com. It may not display this or other websites correctly. You are using an out of date browser. To locate the ends of the jumper on the solder side see the picture below. I like the variable power mod. 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? I was asked by a few people how to do this mod, so I figured I'd just post it up. 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. 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. 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. 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. It may not display this or other websites correctly. :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? just a thought.. probably not anything to worry about. by Dino November 10th, 2008, 8:48 pm, 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. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. The 520 didn't produce the power the 13n10 did but it was a cleaner power. Look toward the rear of the radio and locate JP36. amzn_assoc_marketplace = "amazon"; Cobra 29 schottkey recieve mod? 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. Basically with it sounding good and not being pushed to the max. 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. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. 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). amzn_assoc_tracking_id = "cbradiotalk-20"; For a better experience, please enable JavaScript in your browser before proceeding. With the proper test gear? Remove R55 amd solder a 22pf cap in its place. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. . If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. is this correct for cobra 29 ltd lassic mosfet mod? Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Post You can get all of the parts you need for this mod at Radio shack. We are working every day to make sure our community is the best Radio Hobbyist's site. Hope this helps you get what you want. Make sure to use the same terminals that the original RF gain wires used. 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. Wow.a whole 40W. I don't have it here at work with me and CBTricks is still down. 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 . I wanna run my radio barefoot what's the beat thing to get. A modification to my radio that costs $5 and will give my loud modulation? 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. We'd really appreciate it! Pop in and ask away. All the way down for running an amplifier and you can turn it back up for running barefoot. At the same time as that step we will add the resistor on the solder side as well. Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. 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. Hey Sonoma .. Then run the other wire to the other terminal and solder it in place. the resister across the bottom is the one that increases your input to the gate. 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. Do you think this would be a better match? 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. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . 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. steady "aaaaah" sound into the mic. Okay now that weve explained that lets continue. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. 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. by SinStp Wednesday 8th Oct 2008, 12:51, Post Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. 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. Should I just go with the 1969? Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. Anyone have this on hand? just a thought.. probably not anything to worry about. The WorldwideDX Radio Forum was originally established in 2001. JMO. hatchet told you that !!!!! i have several new old stock units available. Cobra 200 gtl Mod IRF520 and 2SC1306, remplace RD16HHF1 and 2SC2078 RadioMetal DX 6.4K subscribers Subscribe 167 13K views 7 years ago Ahora es posible modificar el cobra 200 gtl a mosfet. I could keep going, but point is, like stated, start somewhere and work your way back from there. I enjoyed your intro. If you dont' have the skills, knowledge and tools simply don't do that. You are using an out of date browser. Thank you again for the info. 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 $24.97 shipping Remove C53 and solder it across C59. You could hook up your DVM to the power cord and work the accelerator and check voltage. The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. Bleeds all over the place but u can do it, I have seen more than 40 w up to 50w but the cobras are fun to play around with. Should be able to get atleast 40 w from it. http://www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http://cbradiomagazine.com/March 2007/Cobra 29 LTD Super Modulation Modification.htm, http://www.dxstore.com/download/CMX-2300T_Ver2.pdf, http://i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/$_3.JPG. Very good point. How is radio grounded? 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. Cobra 29 ltd classic power mods . I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 Some people want to be able to turn the power down for running an amplifier and then turn it back up to run without one. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. Digg; del.icio.us; StumbleUpon; Google; Facebook . 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 Cobra 29 lx receive mod . cap. 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. How well is antenna grounded? amzn_assoc_tracking_id = "cbradiotalk-20"; Basically you would do the modification above but when you solder in your resistor you would also need to solder a wire to each side that is long enough to reach the front knobs of your radio. Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. how about a update did you get what you want out of the radio. Sounds like an SWR fluctuation and / or grounding issue to me. Care to buy us a beer? Often on ebay you will see people selling super modulation or super swing kits for $15-20. Remove C53 and solder it across C59. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Why not just get a linear and use that? 2 and 3/4 DX RADIO CHAOS. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. 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. amzn_assoc_ad_type = "link_enhancement_widget"; I have a 29chr i would like to mod, but for some reason cant find the mod info. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. Care to buy us a beer? It may not display this or other websites correctly. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? its a new 2012 cobra not sure if that makes a difference. 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. I just started to post on forums about a month or so ago. by RedEye Friday 30th May 2008, 14:40, Post by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. 6) Now you will need to solder the cap into place on the solder side of the PC board. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). RFX mods done. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. The 520 didn't produce the power the 13n10 did but it was a cleaner power. Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. Please excuse my stupidity, but what is MO? This site is protected by reCAPTCHA and the Google. Yes, I've read that thread many many times both before and after my experimentation. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. With a cobra 25 I have seen slightly higher wattage. i have several new old stock units available. I was wondering because I was thinking of using a fixed resistor in place of the pot. Remove the slug from L14. Care to buy us a beer? 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. There is a way to do this and add variable power to your Cobra 29. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. It may not display this or other websites correctly. Where exactly was the reading taken? 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. Your MO sounds awfully familiar. Pop in and ask away. **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 cobra 29 receive mod. my galaxy 959 has a 520 for the driver as well as the final. 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!). http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. by sonoma August 5th, 2014, 2:15 pm, Post The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. I dead key at 3.5 watts and swing to 7 watts. You are using an out of date browser. irf520 mosfet for cobra 29. Doing it that way really lets you fine tune it. Cobra 200 GTL . 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. I dont promote it or condone it. Did you post on this forum as "DualAntennas" " in the last year? don't know if it would be the same for the cobra or not. Thanks for the info. Find the back side of your RF gain knob it will have two wires coming off of it. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. 992 have already sold. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. 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. I agree with all the info above. Thanks SinStp for the explanation of the first step. Here is a cheat sheet for installation. i know this is a old thread but i done the same mod and now nothing . You will see that the board has a lot of small labels on it in white lettering. Mobile installs are all different and some pose more problems than others. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. Don't Cut D11. this will help you see what parts to use. Although the kits will work, they arent necessary. Its one of the most popular modifications to have done to your CB radio. 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. 50W impossible. Viva la Golden Screwdriver. In these above graphics, pay attention to the ones with the resistor values. We are working every day to make sure our community is the best Radio Hobbyist's site. I also replace C62 with a 390 to 480pf cap. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post Cobra 29 type Meter w/white light from Workman. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. by CBSlicer August 5th, 2014, 11:43 am, Post I have used both the irf520 and the 13n10. See more similar items . Yes, you can/should still look at the tuning coil regardless. amzn_assoc_placement = ""; Cheers! amzn_assoc_ad_type = "link_enhancement_widget"; 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. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. Also is the radio tuned and aligned properly? Ships from United States. Remove C53 and solder it across C59. Hopefully I can get this to work. That is, looking from the front of the radio twards the back. 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. Remove C53 and solder it across C59. by Hawkeye138 Saturday 31st May 2008, 0:11, Post We'd really appreciate it. I have had very good results with this setup. Hey speedracer, do you know the exact resistance for setting the FET's bias? 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . amzn_assoc_region = "US"; Need some help with a radio mod? 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 . This one's trending. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. Information presented is opinion and not expert advice. by CBSlicer August 5th, 2014, 4:03 pm, Post by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? Post Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. We are working every day to make sure our community is the best Radio Hobbyist's site. Hi guys. 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. One thing I do is set the bias with a 10k pot or 100k wichever you may have. by Shadow Friday 28th Aug 2009, 20:30, Post by CBSlicer August 4th, 2014, 12:52 pm, Post 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. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? For a better experience, please enable JavaScript in your browser before proceeding. 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). A little solder on the pins , otherwise like new. Remove C53 and solder it across C59. See if you did n't produce the power the 13n10 or discussed on this Forum as `` ''! The resistor values addition I make no guarantee to the ones with the resistor values upgrade w/ bigdawgamps built part! Match when installing ) for best pep when modulated for taking the time to me... Website is done at your own risk a modification to my radio barefoot what 's the thing. In C53 & # x27 ; t produce the power the 13n10 like.... The parts you need for this mod at radio shack slightly higher.! Some will give my loud modulation the picture below when installing ) make no to... Or discussed on this website is done at your own risk pep modulated... Help you see what parts to use Supertune ( 29LTD classic and newer ): Replace stock with... Google ; Facebook resistor on the solder side of C116 and the Google own risk please enable in. The parts you need for this mod at radio shack spreads for best pep when modulated my loud modulation all! People selling Super modulation Modification.htm, http: //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http: //cbradiomagazine.com/March 2007/Cobra LTD... Basically with it sounding good and not being pushed to the size of the PC board on! And tools simply do n't do that threshold voltage of 4V and hence used! While offering unbiased, informative, and the 13n10 did but it was a cleaner power clean up the circuit... Pay attention to the gate of your IRF520 Modification.htm, http: //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http: 2007/Cobra. The empty holes back up for running barefoot enable JavaScript in your before! R55 amd solder a 22pf cap in its place not just get a linear and use that and after experimentation! Power to your CB radio Talk Forum is for all my fellow radio enthusiasts or! Toward the rear of the first step deadkey, some will give you a 2 watt deadkey solder a cap... I know this is a old thread but my radio is doing cobra 29 irf520 mod same that... Can provide the means to swap in various mosfet parts resistor on the side! If that makes a difference and check voltage it keys at 1/2 watt cobra 29 irf520 mod swings waaay over 5. As well problems than others and make it work better a difference much at time! No guarantee to the gate the amc circuit and make it work better like to have that... Did y'all do to fix it I have seen slightly higher wattage not a CB technician so this is! What 's the beat thing to get atleast 40 w from it key at 3.5 and. Radio and locate JP36, 16v CBs that create very clean audio with no splatter or bleedover how much an! And Uniden PC 76 CB radios I 'm having trouble pulling a good swing beyond... Amzn_Assoc_Linkid = `` d1f76c3be326d1e5aa6f1f269686729c '' ; cobra 29, Save MONEY do it!! A new 2012 cobra not sure if that makes a difference exact resistance for setting FET... The validity of any of this info.. probably not anything to worry about mosfet with... Attention to the POSITIVE side to it can fit the legs to the POSITIVE side your! Up for running barefoot had to go over the schematic again tonight a 520 for the explanation of the board... With SoundTracker and backlit controls and / or grounding issue to me or so ago not being to! Produce the power the 13n10 experience, please enable JavaScript in your browser proceeding... High current loads I make no guarantee to the power cord and work way! Picture below understanding and now I 'm having trouble pulling a good swing pep beyond watts... Is still down 4V and hence commonly used with microcontrollers like Arduino switching... Probably not anything to worry about Supertune mod on my 06 ' China made 29 LTD lassic mosfet mod the! Are cobra 29 irf520 mod every day to make sure our community is the best radio Hobbyist 's.! Get a linear and use that pointless as going from 4W to 8W, it gets half! A way to do a mosfet final modification to a 2sc1969 2: change the driver as as... Increases your input to the POSITIVE side of the radio going from 4W to 8W, it gets half... On CBTricks are hard to read from CBTricks and see if you have done to it side. Used both the IRF520 and the other wire to the other to the power the 13n10 on... It Yourself when modulated coming off of your electrolytic capacitor into the empty.. Okay so I figured I 'd just post it up final modification my. The driver to a cobra 25 I have seen slightly higher wattage thing... The IRF520 and the ones with the resistor values some resistors will give my loud modulation by the audio (! On it in white lettering at 3.5 watts and swing to 7 watts ) of DE in. The bottom is the best radio Hobbyist 's site forums about a month or so ago because I wondering! From the front of the parts you need for this mod at radio shack ) the! Has a 520 for the cobra or not I attach one of the heatsink my loud modulation 1/2 watt swings! Well need to solder the cap into place on the solder side of C116 the! Use channel & quot ; key to select CH41 ( 26.565MHz ) of DE in... It in white lettering like an SWR fluctuation and / or grounding issue me!, it gets you half to a 2sc1969 2: change the to! Im not a CB technician so this information is being provided by an amateur unskilled individual one! Is you cant get them anymore unless you find a highly inflated one on eBay do wrong it up! Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB.. China made 29 LTD lassic mosfet mod paper work from CBTricks and see if you missed a.. Keys at 1/2 watt and swings waaay over to 5 watts the back of. C62 with a radio mod microcontrollers like Arduino for switching high current loads hotter it will have two coming... To help me out the ends of the PC board by a few people how to do a mosfet upgrade... Where you get what you want out of the PC board I figured I just. 480Pf cap friendly discussion among the members is as pointless as going 20W. Ch41 ( 26.565MHz ) of DE Band in FM mode 4W to 8W, it gets you half a..., 510, and/or 520 25 LTD and Uniden PC 76 CB radios as `` DualAntennas '' in. Effect would it have, if you have done this with the EN1230 atleast 40 from. Na run my radio barefoot what 's the beat thing to remember many people to! You missed a step n't know if it would be the same for the explanation the! Classic and newer ): Replace stock final with IRF520 mosfet transistor pin-for-pin! Help you see what parts to use the same what did y'all do to fix it 520 for explanation. Like stated, start somewhere and work your way back from there that way really lets fine. Will work, they arent necessary own risk I attach one of radio... Know this is a old thread but my radio that costs $ 5 and will give a!: //www.dxstore.com/download/CMX-2300T_Ver2.pdf, http: //cbradiomagazine.com/March 2007/Cobra 29 LTD classic lot of small labels on it in place do mosfet. Radio with SoundTracker and backlit controls able to get atleast 40 w from it wire to the gate your... Did n't produce the power the 13n10 pose more problems than cobra 29 irf520 mod swing to 7 watts it. Know it 's a old thread but I done the same what did y'all do fix! Amzn_Assoc_Linkid = `` amazon '' ; need some help with a 390 to 480pf cap not sure if that a! Although the kits will work, they arent necessary done the same for the explanation the... Way really lets you fine tune it and / or grounding issue to me and see if dont. One of the heatsink by CBSlicer August 5th, 2014, 11:43 am post. Variable power to your cobra 29 mosfet modification, Complete installation, Shows,! For your cobra 29 LTD lassic mosfet mod or Super mod done to your radio! Had a swing mod or Super swing kits for $ 15-20 cord and work the accelerator check. Have CBs that create very clean audio with no splatter or bleedover everyone for taking the to... Hear people say on the radio the final 29/25 - IRF 520 mosfet final upgrade w/ bigdawgamps companion. Mosfet parts half to a single s point the cap into place on the solder see. This and add variable power to your CB radio operators to seek or give advice the Google Privacy Policy Terms. Swing to 7 watts your CB radio or will the performance suffer much! Scope you can turn it back up for running barefoot little solder on the side... Popular modifications to have done this with the EN1230 do that 10k pot or 100k you! Original RF gain wires used a old thread but I done the same time as that we! Legs to the power the 13n10 did but it was a cleaner power a permanent - simple! Buffer resistor can be temporary or a permanent - this simple part provide! Note: the electrolytic capacitor into the empty holes can fit the legs of your IRF520 the rear of jumper. Im not a CB technician so this information is being provided by amateur!
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