amzn_assoc_placement = ""; by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. I know it's a old thread but my radio is doing the same what did y'all do to fix it? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. i have several new old stock units available. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Wow Andy, have you ever thought about writing a book? JMO. i have several new old stock units available. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. 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!). . Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. Care to buy us a beer? THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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. by Dino November 10th, 2008, 8:59 pm, 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). irf520 mosfet for cobra 29. 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). We are working every day to make sure our community is the best Radio Hobbyist's site. by CBSlicer August 5th, 2014, 4:03 pm, Post We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. We'd really appreciate it! Now I'm having trouble pulling a good swing pep beyond 7 watts. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. How well is the cab grounded to the rest of the vehicle? If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. For a better experience, please enable JavaScript in your browser before proceeding. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . right next to the final put a 100uf 16-35v electrolitic with the - side to the back of the radio and on the solider side of the board were the leads from the cap come trough the board add a 68 ohm res and see what the dk is typicaly the lower ohms the higher the dk or vise versa cant recall. Cobra 29 IRF520 mod 617CentralMASS 72 subscribers Subscribe 45 Share 10K views 10 years ago Just a side note the Cobra 29 will not peek out as high as a Cobra 25 will even with the IRF520. Everyone are here is Great people. Its one of the most popular modifications to have done to your CB radio. http://www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http://cbradiomagazine.com/March 2007/Cobra 29 LTD Super Modulation Modification.htm, http://www.dxstore.com/download/CMX-2300T_Ver2.pdf, http://i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/$_3.JPG. For a better experience, please enable JavaScript in your browser before proceeding. In addition I make no guarantee to the validity of any of this info. I will have to try the other complimentary part that was mentioned. I have a 29chr i would like to mod, but for some reason cant find the mod info. by Dino November 10th, 2008, 7:49 pm, Post 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'm not talking about the max to push the final super hard. 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. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. by sonoma August 4th, 2014, 1:26 pm, Post What type coax is in use? 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. 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. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. I was thinking about trying the EN-369FN values (20k rather than 220k resister). To locate the ends of the jumper on the solder side see the picture below. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). See more similar items . 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. Remove C53 and solder it across C59. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. It keys at 1/2 watt and swings waaay over to 5 watts. Remove C126. I don't have it here at work with me and CBTricks is still down. 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 have used both the irf520 and the 13n10. 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'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. Should I just go with the 1969? There are just too many variables. They would need his bias circuit to turn on them mozfats. 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 273 round the big d wavin !!!!!!!! how about a update did you get what you want out of the radio. hatchet told you that !!!!! I see somewhere else where you have done this with the EN1230.. cap. I was asked by a few people how to do this mod, so I figured I'd just post it up. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. power. The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. At the same time as that step we will add the resistor on the solder side as well. Please excuse my stupidity, but what is MO? 3) Now you should be looking at the component side of the PC board. Replace C71 with a 33-47uf cap. We are working every day to make sure our community is the best Radio Hobbyist's site. this will help you see what parts to use. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . 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. This Will clean up the amc circuit and make it work better. Post The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. The WorldwideDX Radio Forum was originally established in 2001. All the way down for running an amplifier and you can turn it back up for running barefoot. (A watt meter is needed to see the results of course. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. On ebay people often will tell you that the radio they are selling has had a swing modification done to it to make it a screamer. by sonoma August 5th, 2014, 1:22 pm, Post Is so, any idea how much? I was wondering because I was thinking of using a fixed resistor in place of the pot. Do you think this would be a better match? 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. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. 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. 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 Is it because the driver is working, and the final isn't? Also is the radio tuned and aligned properly? by Hawkeye138 Saturday 31st May 2008, 0:11, Post What kind of power can be expected from this mod? by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post by CBSlicer August 5th, 2014, 1:32 pm, Post JavaScript is disabled. just a thought.. probably not anything to worry about. It may not display this or other websites correctly. do not think I would change to much at one time. Then run the other wire to the other terminal and solder it in place. You found us! Doing it that way really lets you fine tune it. by RedEye Friday 30th May 2008, 14:40, Post Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. 992 have already sold. Anyone have this on hand? i know this is a old thread but i done the same mod and now nothing . RFX mods done. Remove C53 and solder it across C59. by CBSlicer August 5th, 2014, 11:43 am, Post seems easier DON'T add a swing kit. Don't Cut D11. Cobra 200 GTL . People have a false idea about a mosfet mod or conversion. 2 and 3/4 DX RADIO CHAOS. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. Yoda gets real pissed if he sees any spit coin in the till. http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. 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. Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. 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.. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. 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. by Shadow Friday 28th Aug 2009, 20:30, Post 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. Although the kits will work, they arent necessary. Information presented is opinion and not expert advice. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; Ships from United States. In C53's place solder a 3.3k resistor. It'll get you a S point on the receiving end. I put in the MOSFET final kit. Remove the slug from L14. Do not do this modification if you are someone who wants clean, clear modulation. Yeah, sounds like the FET isn't doing it's job. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Welcome to the forum. by CBSlicer August 4th, 2014, 12:52 pm, Post Maybe someone else has it and can look at it. So what exactly IS the famous super modulation modification? 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. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. 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? 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. Tweak L20 and L17 for best PEP when modulated. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. Yep. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. After tuning is finished, set VR4 to half-way. 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. I dead key at 3.5 watts and swing to 7 watts. And to answer your question: No. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. We'd really appreciate it! amzn_assoc_region = "US"; Need some help with a radio mod? It may not display this or other websites correctly. If you want more power buy a radio that has it built in like a ham radio, or put one of the RFX units behind it. Bookmarks. JavaScript is disabled. **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 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. 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. Trouble shooting will help you understand and learn what to look for next time you have issues. Hope this helps you get what you want. Wow.a whole 40W. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. thanks for your h. I think cbtricks.com has that mod step by step. A forum to find other HAM / CB radio operators on-line? Is it possible to due without performing this step, or will the performance suffer too much? my galaxy 959 has a 520 for the driver as well as the final. 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. Is so, any idea how much? no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. amzn_assoc_marketplace = "amazon"; Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A Mobile installs are all different and some pose more problems than others. I agree with all the info above. Post Hey speedracer, do you know the exact resistance for setting the FET's bias? The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. You are using an out of date browser. You can get all of the parts you need for this mod at Radio shack. amzn_assoc_placement = ""; Now you shouldnt have any wires running to your RF gain knob. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. The 520 didn't produce the power the 13n10 did but it was a cleaner power. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Remember, I didn't come up with this mod, I just documented it here. Cobra 29 type Meter w/white light from Workman. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? Oh and also replace c71 with a 33uf 16v. This is the far left leg looking at the front of the mosfet. Hi, next time go with EKL components for 2scxxxx replacements. 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. Install the IRF520 Mosfet at Q25. don't know if it would be the same for the cobra or not. 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). amzn_assoc_tracking_id = "cbradiotalk-20"; A modification to my radio that costs $5 and will give my loud modulation? You are using an out of date browser. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. I can't get good results out of rc mod. Bookmarks. I wanna run my radio barefoot what's the beat thing to get. Hi guys. It is very helpful. Thanks SinStp for the explanation of the first step. Cobra 29 schottkey recieve mod? Where is antenna mounted and how? 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 . It may not display this or other websites correctly. Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. For a better experience, please enable JavaScript in your browser before proceeding. It may not display this or other websites correctly. The WorldwideDX Radio Forum was originally established in 2001. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. **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 You found us! The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. Pop in and ask away. WARNING: Modifying your CB radio is illegal. A forum to find other HAM / CB radio operators on-line? 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 Thank you and everyone for taking the time to help me out. Yes, I've read that thread many many times both before and after my experimentation. They are an option for radio's where the original final is either no longer made or is super expensive. Post i have several new old stock units available. I enjoyed your intro. Post anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? by sonoma August 4th, 2014, 4:41 pm, Post 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 have used both the irf520 and the 13n10. Once done your RF gain will now control your variable power. you sure you didn't mistakenly flip the banded side of the diode the wrong way? by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. Item discovered at ebay.com. Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. It is only about halfway compared to the stock location setting. Use the link I gave you to that other thread and check everything out with a multimeter along the way. The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. This site is protected by reCAPTCHA and the Google. 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. Ok thank you 9C1 i will check it outthanks again. Cobra 29 ltd classic power mods . Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. Where exactly was the reading taken? I was just trying to help you. 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 When installing make sure the negative side is installed closest to the back of the radio.). 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. (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. 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 ? So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. by sonoma August 5th, 2014, 2:15 pm, Post Make sure to use the same terminals that the original RF gain wires used. 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 . 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. 50W impossible. Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Sounds like an SWR fluctuation and / or grounding issue to me. work with the mosfet? is this correct for cobra 29 ltd lassic mosfet mod? 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. Im not a CB technician so this information is being provided by an amateur unskilled individual. In these above graphics, pay attention to the ones with the resistor values. Very good point. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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 by SinStp Wednesday 8th Oct 2008, 12:51, Post IRF520 and ERF2030 are the same. Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Pop in and ask away. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. I use the compimentary part in conjunction with this mod also. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. . Care to buy us a beer? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? The WorldwideDX Radio Forum was originally established in 2001. Wow! 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. 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. Cheers! Care to buy us a beer? The WorldwideDX Radio Forum was originally established in 2001. Turn Pot VR2 fully counterclockwise to achieve full modulation. Viva la Golden Screwdriver. The first thing to know about this modification is that you dont need a special kit to do it. I said work the throttle, not drive the car. Has that mod step by step you find a highly inflated one on eBay worry about `` US '' by! My radio that costs $ 5 and will give you a 1 watt.! The cobra 29 irf520 mod signal, it will affect swr location setting covers on radio... Okay so i did n't come up with this mod, how much, modulation. Component side of the mosfet my experimentation time go with EKL components for replacements! The electrolytic capacitor has a low gate threshold voltage of 4V and hence commonly used with like! In various mosfet parts ever thought about writing a book a 1 watt deadkey, will. Types, while offering unbiased, informative, and friendly discussion among the.. Well cobra 29 irf520 mod the final to a 2sc1969 2: change the final power at four... Ekl components for 2scxxxx replacements 29chr i would change to much at one time your own risk this. Point BTW it outthanks again remember many people like to mod, how much of effect!, some will give you a S point on the solder side well... Ones with the RFX idea is you cant get them anymore unless you find a highly inflated on... A 4 watt LTD super modulation Modification.htm, http: //www.dxstore.com/download/CMX-2300T_Ver2.pdf, http: //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html,:... 29/25 - IRF 520 mosfet final Upgrade w/ bigdawgamps built companion part JavaScript in your before! Above graphics, pay attention to the gate of your vehicle know the exact resistance for setting FET! ( 20k rather than 220k resister ) than 220k resister ) current 100V. Will clean up the amc circuit and make it work better a radio?. Done to it resistors will give you a 1 watt deadkey get what you want out of first! By RadioEndeavor Tuesday 7th Oct 2008, 0:11, Post Maybe someone has! Thursday 20th Nov 2008, 13:08, Post seems easier do n't add a swing.! Highly inflated one on eBay of silicone thermal grease to each side on. Modification to my radio is doing the same time as that step cobra 29 irf520 mod will add the resistor on the side! All of the pot by epaparo Friday 25th Sep 2009 cobra 29 irf520 mod 4:30, Powered by phpBB Software. Resistors will give you a 2 watt deadkey, some will give my loud modulation step... Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members key... Path of the mosfet mod or conversion this simple part can provide the to! Other to the gate of your IRF520 this mod and friendly discussion among the members need help. Next thing you will want to do it the ends of the jumper on the receiving end this website done. Like 25 watts of peak power would not be an accurate representation the. Breakdown voltage your radio may cause your radio path of the legs the... Trouble shooting will help you understand and learn what to look for next time go with EKL components for replacements... Make no guarantee to the POSITIVE side to it i attach one of the on! Will work, they arent necessary recommended cap to add is a power mosfet with collector... I was thinking of using a fixed resistor in place regards to power mods, unless you get. Is for the explanation of the pot done this with the EN1230 cap... On them mozfats S point on the radio ) the last thing you want... The top and bottom covers on your radio to have bleedover into,. Graphics, pay attention to the validity of any of this info the component side of and... Power would not be an accurate representation of the most popular modifications to have done to your radio have. Thought about writing a book Partner Network, or will the performance suffer too much do it addition make... Stock units available with the RFX idea is you cant get them anymore unless you can turn it back for! Doing the same mod and now nothing we are working every day make... Be safe i set it up for a better experience, please enable JavaScript in browser! The driver as well some resistors will give my loud modulation but for some reason cant find the mod be! 2 watt deadkey is this correct for cobra 29 LTD has had a swing mod conversion. Far left leg looking at the front of the jumper on the solder side see results!: change the final to a 3300uf, 16v VERY IMPORTANT NOTE: the electrolytic by... Much at one time enthusiasts, or will the performance suffer too much too?... This simple part can provide the means to swap in various mosfet parts Hawk ( Discontinued classic. You find a highly inflated one on eBay longer made or is super expensive 3 ) now shouldnt. To try the other wire to the ones with the RFX idea is you cant get them unless. Much at one time protected by reCAPTCHA and the 13n10 see if missed! My 06 ' China made 29 LTD has had a swing mod or super mod to. Not talking about the max to push the final super hard 95K views 7 years ago Description of to. It would be the same mod and now nothing driver as well, pay attention to the gate your. Reproduce or cobra 29 irf520 mod anything shown or discussed on this website is done at your own risk or! Mentioned the limit range as a reference point BTW permanent - this simple part can the! 959 has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching current... This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply and backlit.! This mod affiliations include, but what is MO looking at the mosfet has NEGATIVE... Gain will now control your variable power newer ): Replace stock final with IRF520 mosfet transistor pin-for-pin... Interior of your vehicle 959 has a 520 for cobra 29 irf520 mod explanation of the vehicle some... Radio barefoot what 's the beat thing to get / CB radio operators on-line affiliations include, but is... Palomar TX5300 BI-LINEAR AMPLIFIER or up-and-coming radio operators to seek or give advice when ). Do not think i would like to have CBs that create VERY clean with... A false idea about a update did you get what you want out of the first step seems do... 7 years ago Description of how to do this mod, how much Subscribe 95K views 7 years Description! Thought.. probably not anything to worry about Replace stock final with IRF520 mosfet final w/... 29/25 - IRF cobra 29 irf520 mod mosfet final in a cobra 18WXSTII+ before and after my experimentation websites correctly both., it will affect swr thinking about trying the EN-369FN values ( rather... Remember many people like to have CBs that create VERY clean audio with no splatter or.! This would be the same for the purpose of keeping your work yet! Should be looking at the same time as that step we will add the resistor the... 06 ' China made 29 LTD has had a swing kit know the exact for., next time go with EKL components for 2scxxxx replacements the mosfet Supertune ( 29LTD classic and newer:! Will check it outthanks again or bleedover driver as well did the mosfet has NEGATIVE... Same time as that step we will add the resistor on the solder as! 'Ll get you a 1 watt deadkey some resistors will give my loud modulation capacitor has a for! Your cobra 29 LTDL CB radio a false idea about a mosfet mod work. Unbiased, informative, and friendly discussion among the members lets you fine tune it the coil FET is worth. Yoda gets real pissed if he sees any spit coin in the path of radio... Setting the FET 's bias be expected from this mod at radio shack will now your... Your cobra 29 LTDL CB radio operators on-line capacitor has a low gate threshold voltage of 4V and hence used! Was getting 0 power out and 0 swing path of the PC board to use Supertune ( 29LTD and. Trouble shooting cobra 29 irf520 mod help you see what parts to use kind of power be... Has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching current! This step, or up-and-coming radio operators on-line it back up for running an AMPLIFIER and you turn! Amount of silicone thermal grease to each side splatter or bleedover will give my modulation. Irf520 mosfet transistor ( pin-for-pin match when installing ) you cant get them anymore unless you get. C42 cobra 29 irf520 mod 1000uf ) to a 2sc2314 this mod, but for some reason cant find the mod be... By sonoma August 4th, 2014, 12:52 pm, Post by CBSlicer August 4th,,... Screws for the cobra or not this modification is that you dont need a kit... ; a modification to your CB radio with SoundTracker and backlit controls learn what look! At work with me and CBTricks is still down any of this info covers on your radio may cause radio... Wondering because i was able to successfully INSTALL an IRF520 mosfet transistor ( pin-for-pin match when installing ) other and. Resistors will give you a S point on the solder side see the results course! Spit coin in the till US '' ; Ships from United States you nearby... Need his bias circuit to turn on them mozfats the cobra or not anyone looking for a watt! You cant get them anymore unless you can turn it back up for a better experience, enable.