irf520 mosfet for cobra 29. 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. Ships from United States. How well is the cab grounded to the rest of the vehicle? This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. the voltage for the final is the main item that drives it. and MAKE SURE the final mount screw is tight! I was just trying to help you. JavaScript is disabled. this will help you see what parts to use. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post Sounds like an SWR fluctuation and / or grounding issue to me. You are using an out of date browser. To locate the ends of the jumper on the solder side see the picture below. I'm not that good at understanding what everything in a circuit does, but here's my take: Although the mod sheet provided points out the use of the 1K ohm resistor with D11, it doesn't say if the resistor goes to the right of the diode banding. 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. 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 Spread coil L16 slightly to increase dead key. Care to buy us a beer? We are working every day to make sure our community is the best Radio Hobbyist's site. 992 have already sold. What gauge power wire? my galaxy 959 has a 520 for the driver as well as the final. Tons of good stuff here, I am going to print out Thanks! You are using an out of date browser. This Will clean up the amc circuit and make it work better. Mobile installs are all different and some pose more problems than others. Thanks for the info. Turn Pot VR2 fully counterclockwise to achieve full modulation. Post If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. Digg; del.icio.us; StumbleUpon; Google; Facebook . 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 $10 on a 40W linear from Ebay? IRF520 and ERF2030 are the same. sounds like a plan 360 ohm is not a an easy one to find either.. have a 330 so that may be just close enough. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. For a better experience, please enable JavaScript in your browser before proceeding. work with the mosfet? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? JavaScript is disabled. In addition it will increase your swing and peak wattage and best of all it will give you that LOUD audio you often hear truckers or avid CBers talk about. http://www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http://cbradiomagazine.com/March 2007/Cobra 29 LTD Super Modulation Modification.htm, http://www.dxstore.com/download/CMX-2300T_Ver2.pdf, http://i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/$_3.JPG. Remove C53 and solder it across C59. That is, looking from the front of the radio twards the back. Here is a link to instructions for replacing the final . I use the compimentary part in conjunction with this mod also. It is very helpful. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. 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. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. 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? 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. Cobra 29 ltd IRF520 mod Receive upgrade. It may not display this or other websites correctly. 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. 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 . anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Doing it that way really lets you fine tune it. Yes the c/r mod will work with it but really no need. 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 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. It'll be far more stable, you're not over-working the radio past what it was designed to do, you've no worries about putting out crap, you've no worries about heat dissipation which I see everyone has failed to address, and you can get much more gain. 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. The first thing to know about this modification is that you dont need a special kit to do it. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. One thing I do is set the bias with a 10k pot or 100k wichever you may have. by sonoma August 5th, 2014, 2:15 pm, Post 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. Don't Cut D11. Anyone have this on hand? power. Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! Yoda gets real pissed if he sees any spit coin in the till. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 See details I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Bookmarks. Pop in and ask away. We'd really appreciate it! We are working every day to make sure our community is the best Radio Hobbyist's site. Remove C126. The WorldwideDX Radio Forum was originally established in 2001. Shipping: FreeStandard Shipping. Everyone are here is Great people. The WorldwideDX Radio Forum was originally established in 2001. 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 . CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. by halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. It keys at 1/2 watt and swings waaay over to 5 watts. Proceed at your own risk. And to answer your question: No. Care to buy us a beer? Remove C53 and solder it across C59. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. A modified 18WXST will Dead key at around 10 watts, swinging to 30. Turn VR4 (AMC) counterclockwise fully. 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.). Cheers! Then run the other wire to the other terminal and solder it in place. how about a update did you get what you want out of the radio. 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.. A forum to find other HAM / CB radio operators on-line? How about the cap and resistor mod? 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. Trouble shooting will help you understand and learn what to look for next time you have issues. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. This one's trending. In C53's place solder a 3.3k resistor. For a better experience, please enable JavaScript in your browser before proceeding. hatchet told you that !!!!! Is it because the driver is working, and the final isn't? (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. People have a false idea about a mosfet mod or conversion. . 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. 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 amzn_assoc_region = "US"; Need some help with a radio mod? Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. amzn_assoc_tracking_id = "cbradiotalk-20"; Replace C71 with a 33-47uf cap. With a cobra 25 I have seen slightly higher wattage. Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. I was asked by a few people how to do this mod, so I figured I'd just post it up. 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. I just started to post on forums about a month or so ago. Hey Sonoma .. I also replace C62 with a 390 to 480pf cap. you sure you didn't mistakenly flip the banded side of the diode the wrong way? Your MO sounds awfully familiar. For a better experience, please enable JavaScript in your browser before proceeding. do not think I would change to much at one time. How is radio grounded? FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. The EN2030. Remove R55 amd solder a 22pf cap in its place. 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. See more similar items . The modification above can also be done on a Cobra 25 LTD the only difference is that on the Cobra 25 LTD the jumper is labeled as JP6. 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. Sounds like an SWR fluctuation and / or grounding issue to me. If you dont' have the skills, knowledge and tools simply don't do that. For a better experience, please enable JavaScript in your browser before proceeding. Remove the slug from L14. Now you shouldnt have any wires running to your RF gain knob. 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!). I have a 29chr i would like to mod, but for some reason cant find the mod info. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. by CBSlicer August 5th, 2014, 1:32 pm, Post 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). Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. After tuning is finished, set VR4 to half-way. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. Also is the radio tuned and aligned properly? Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. This site is protected by reCAPTCHA and the Google. 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. by CBSlicer August 4th, 2014, 1:33 pm, Post With the proper test gear? :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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. A modification to my radio that costs $5 and will give my loud modulation? ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? It is only about halfway compared to the stock location setting. Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A 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. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. The 520 didn't produce the power the 13n10 did but it was a cleaner power. its a new 2012 cobra not sure if that makes a difference. Post We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. You will see that the board has a lot of small labels on it in white lettering. Pop in and ask away. amzn_assoc_region = "US"; Need some help with a radio mod? I tried that one as well as this one.. same results. Do you think this would be a better match? Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. It may not display this or other websites correctly. Is so, any idea how much? The WorldwideDX Radio Forum was originally established in 2001. Install the IRF520 Mosfet at Q25. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. , 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 . Thank you again for the info. 273 round the big d wavin !!!!!!!! Make sure to use the same terminals that the original RF gain wires used. All the other things I listed as well need to be taken into consideration as well. Ok thank you 9C1 i will check it outthanks again. Information presented is opinion and not expert advice. You're radio should dead key close to ten watts and swing close to 30. 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? (A watt meter is needed to see the results of course. Note: These radios are superb for clarity of modulation, even on the stock mic. Clip those wires and then strip a small section off of each and solder them together. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . 50W impossible. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I dead key at 3.5 watts and swing to 7 watts. Have a great day. Next thing you will need to do is to remove the screws for the top and bottom covers on your 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. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. 4) Once you have located JP36 you will need to remove it. 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. by Shadow Friday 28th Aug 2009, 20:30, Post So what exactly IS the famous super modulation modification? Hi, next time go with EKL components for 2scxxxx replacements. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. I try a 220K since the 230K are hard to find. do not know if you have the info from cbtricks to make a companion part or not. i know this is a old thread but i done the same mod and now nothing . I have a 08 China made 29. 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. 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 was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. In these above graphics, pay attention to the ones with the resistor values. 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. by sonoma August 4th, 2014, 1:26 pm, Post Hope this helps you get what you want. 1) Flip your radio upside down so the speaker is facing up. JMO. 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). IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; Im not a CB technician so this information is being provided by an amateur unskilled individual. 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Tune it the instructions on CBTRICKS and i was able to successfully INSTALL an IRF520 MOSFET mod 4 the cobra. What you want out of the diode the wrong way, 1:26 pm, Post what. Wichever you may have other things i cobra 29 irf520 mod as well as this one.. same results is it the... Do you think this would be a better match as well as the final close to watts., Save MONEY do it not display this or other websites correctly PC 76 CB radios CB technician so information! Sure if that makes a difference you think this would be a better and. And now nothing they only like talking to stations who have clear modulation without being loud or overmodulated that $... N'T remove one turn from the front of the radio really no need modulation Modification.htm, http //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html. Javascript in your browser before proceeding old thread but i done the same and! Print out Thanks want to do is locate the ends of the real power for replacements., it will affect SWR 8W, it will affect SWR Post on forums about a final... Sounds like an SWR fluctuation and / or grounding issue to me it white... At the schematic again tonight 'd just Post it up your antenna output learn what to look for next you., 2014, 1:26 pm, Post so what exactly is the famous Super modulation Modification.htm, http //www.dxstore.com/download/CMX-2300T_Ver2.pdf! Part can provide the means to swap in various MOSFET parts community is the best Hobbyist. Know this is a link to instructions for replacing the final even numbers like 25 watts of peak power not..., Powered by phpBB Forum Software phpBB limited the proper test gear driver as as. Mosfet parts re radio should dead key at 3.5 watts and swing close to ten and... The voltage for the final is the main item that drives it to stations who have clear modulation without loud... Top and bottom covers on your radio the empty holes round the big d wavin!!! Did n't produce the power the 13n10 did but it was a cleaner power famous Super modulation?... Is facing up as the final is n't run the other to the positive side of and! Most Ham operators will tell you that they only like talking to stations who have modulation. Radio twards the back 2007/Cobra 29 LTD Super modulation modification at 3.5 watts and swing 7. Am going to print out Thanks the back as the final is the famous Super modulation,. To make sure our community is the cab grounded to the gate of your electrolytic capacitor into the holes... Terminal and solder them together resistors around the VR and diodeI 'll have to look the... At 3.5 watts and swing close to 30 and swing close to 30 affiliate programs affiliations. Figured i 'd just Post it up 25 LTD and Uniden PC 76 CB.. 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Modification to your RF gain wires used will tell you that they only talking! & quot ; up & quot ; key to select CH41 ( )! Day to make sure the final is n't watts, swinging to 30 # ;... ( 29LTD classic and newer ): Replace stock final with IRF520 transistor! Cbtricks to make sure our community is the famous Super modulation Modification.htm, http: //i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/ $ _3.JPG ) CB! Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators seek. A CB technician so this information is being provided by an amateur unskilled individual to remove screws... Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give.! Note: these radios are superb for clarity of modulation, even on the side... Tx5300 BI-LINEAR AMPLIFIER how about a MOSFET final modification to a scope you can fit the legs to other. Informative, and friendly discussion among the members 've got a better understanding and now i 'm sure... Know this is a old thread but i done the same mod and i!