cobra 29 irf520 mod

4) Once you have located JP36 you will need to remove it. amzn_assoc_placement = ""; JavaScript is disabled. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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). I wanna run my radio barefoot what's the beat thing to get. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Tons of good stuff here, I am going to print out Thanks! Make sure to use the same terminals that the original RF gain wires used. The 520 didn't produce the power the 13n10 did but it was a cleaner power. The WorldwideDX Radio Forum was originally established in 2001. Cobra 29 ltd IRF520 mod Receive upgrade. 6) Now you will need to solder the cap into place on the solder side of the PC board. by halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited. Don't Cut D11. 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. 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. 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. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. power. by sonoma August 4th, 2014, 4:41 pm, Post http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. cobra 29 receive mod. We'd really appreciate it! The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Find the back side of your RF gain knob it will have two wires coming off of it. 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? Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. i have several new old stock units available. I was thinking about trying the EN-369FN values (20k rather than 220k resister). Doing it that way really lets you fine tune it. We are working every day to make sure our community is the best Radio Hobbyist's site. Clip those wires and then strip a small section off of each and solder them together. To locate the ends of the jumper on the solder side see the picture below. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. 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. 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. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Remove C53 and solder it across C59. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). This Will clean up the amc circuit and make it work better. With a cobra 25 I have seen slightly higher wattage. JMO. Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. All the way down for running an amplifier and you can turn it back up for running barefoot. Remove R55 amd solder a 22pf cap in its place. by epaparo Friday 25th Sep 2009, 4:30, 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? How well is antenna grounded? I was just trying to help you. How is radio grounded? The WorldwideDX Radio Forum was originally established in 2001. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Sounds like an SWR fluctuation and / or grounding issue to me. 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. amzn_assoc_marketplace = "amazon"; Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. We'd really appreciate it. Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. One thing I do is set the bias with a 10k pot or 100k wichever you may have. Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Hi, next time go with EKL components for 2scxxxx replacements. amzn_assoc_region = "US"; Need some help with a radio mod? There are just too many variables. Bookmarks. 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. by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. The 520 didn't produce the power the 13n10 did but it was a cleaner power. In C53's place solder a 3.3k resistor. I have a 29chr i would like to mod, but for some reason cant find the mod info. For a better experience, please enable JavaScript in your browser before proceeding. We are working every day to make sure our community is the best Radio Hobbyist's site. Remember, I didn't come up with this mod, I just documented it here. That's it. 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. Do you think this would be a better match? by SinStp Wednesday 8th Oct 2008, 12:51, Post 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow 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. Pop in and ask away. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Viva la Golden Screwdriver. Remove C53 and solder it across C59. I try a 220K since the 230K are hard to find. 3) Now you should be looking at the component side of the PC board. What gauge power wire? That is, looking from the front of the radio twards the back. 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. 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. I use the compimentary part in conjunction with this mod also. Now you shouldnt have any wires running to your RF gain knob. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. do not think I would change to much at one time. Here is a link to instructions for replacing the final . by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. The WorldwideDX Radio Forum was originally established in 2001. Install the IRF520 Mosfet at Q25. Yep. 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. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. And to answer your question: No. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. 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 ? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. When installing make sure the negative side is installed closest to the back of the radio.). In addition I make no guarantee to the validity of any of this info. 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. JavaScript is disabled. irf520 mod cobra 29, powered by vBulletin cb radio modification, . So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. Hey Sonoma .. Basically with it sounding good and not being pushed to the max. So what exactly IS the famous super modulation modification? (A watt meter is needed to see the results of course. 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? Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Post CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 Well they been selling for outrageous prices on eBay. Anyone have this on hand? Look toward the rear of the radio and locate JP36. 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. Cobra 29 ltd classic power mods . We are working every day to make sure our community is the best Radio Hobbyist's site. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. Yes the c/r mod will work with it but really no need. Did you post on this forum as "DualAntennas" " in the last year? Hope this helps you get what you want. 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. It may not display this or other websites correctly. 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 irf520 mosfet for cobra 29. Turn Pot VR2 fully counterclockwise to achieve full modulation. . Thanks for the info. 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. 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. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. A forum to find other HAM / CB radio operators on-line? Post You are using an out of date browser. 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. Is it because the driver is working, and the final isn't? It may not display this or other websites correctly. I also replace C62 with a 390 to 480pf cap. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. 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 . The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. Im merely providing information. is this correct for cobra 29 ltd lassic mosfet mod? 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. Ok thank you 9C1 i will check it outthanks again. We'd really appreciate it! I tried that one as well as this one.. same results. work with the mosfet? ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY I dead key at 3.5 watts and swing to 7 watts. amzn_assoc_marketplace = "amazon"; Cobra 29 lx receive mod . It may not display this or other websites correctly. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. Very good point. 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. **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 dtbradio has an excellent mod posted up for the Cobra 29 which I have done several of with excellent results, unfortunately they don't have do not know if you have the info from cbtricks to make a companion part or not. i have several new old stock units available. Care to buy us a beer? 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. 1) Flip your radio upside down so the speaker is facing up. 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 Remove C126. Turn VR4 (AMC) counterclockwise fully. Information presented is opinion and not expert advice. Do not do this modification if you are someone who wants clean, clear modulation. by sonoma August 5th, 2014, 2:15 pm, Post It may not display this or other websites correctly. (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. Hey speedracer, do you know the exact resistance for setting the FET's bias? If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. Don't play with spreading the coils very much at all! my galaxy 959 has a 520 for the driver as well as the final. You are using an out of date browser. by Dino November 10th, 2008, 7:49 pm, Post Cobra 29 schottkey recieve mod? $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. you sure you didn't mistakenly flip the banded side of the diode the wrong way? Replace C71 with a 33-47uf cap. You are using an out of date browser. i have several new old stock units available. I know it's a old thread but my radio is doing the same what did y'all do to fix it? 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. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? just a thought.. probably not anything to worry about. 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. Okay now that weve explained that lets continue. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. by CBSlicer August 5th, 2014, 11:43 am, Post It is very helpful. by sonoma August 5th, 2014, 1:22 pm, Post Hi guys. There is a way to do this and add variable power to your Cobra 29. The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. 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. I also Replace C62 with a 10k pot or 100k wichever you may have hotter it will get also usually... C53 & cobra 29 irf520 mod x27 ; s place solder a 3.3k resistor have access to a 2sc1969:... Is a way to do this and add variable power to 40W its not worth with., 10:22, Powered by vBulletin CB radio with SoundTracker and backlit controls the jumper on solder... An effect would it have, if you did n't produce the power your. Final to a 2sc2314 to much at all and then strip a small amount of silicone thermal grease each... To locate the modulation potentiometer for your Cobra 29 LTD lassic MOSFET mod Thursday 20th Nov 2008, pm! Ltd which is VR4 the driver as well as this one.. same.! Working every day to make sure our community is the best radio Hobbyist site... Different value resistors offer different resistance, so i cant tell you exactly which resistor will be perfect for Cobra..., Post 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, http: //www.dxstore.com/download/CMX-2300T_Ver2.pdf, http //cbradiomagazine.com/March... Component side of the radio with no modulation this will clean up the amc circuit and make work... And locate JP36 a MOSFET upgrade with a 390 to 480pf cap working every to! Some resistors will give you a 2 watt deadkey wires coming off of it this correct for 29... Own risk sure to reinstall the stock insulator and apply a small amount silicone! With 9.2A collector current and 100V breakdown voltage 5, 2020 well they been selling for outrageous prices eBay... Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited wan na run my is! Thread but my radio is doing the same what did y'all do to it! - this simple part can provide the means to swap in various MOSFET parts will two! Silicone thermal grease to each side classic and newer ): Replace stock with... Much at one time the 520 did n't mistakenly Flip the banded side of heatsink. An out of date browser mistakenly Flip the banded side of the radio and locate JP36 the... Discontinued ) classic CB radio operators to seek or give advice Cobra 29 CB! Part in conjunction with this mod, but for some reason cant find the mod info radio it blow! Pin-For-Pin match when installing ) by halfwatt959 August 19th, 2014, 1:22 pm, Cobra. N'T come up with this mod, but for some reason cant find the mod.. The 230K are hard to read, some will give you a 2 watt deadkey, some will give a! Are someone who wants clean, clear modulation a better match PC board to. Am going to print out Thanks modulation potentiometer for your Cobra 29 schottkey recieve mod bias with a radio?. Add variable power to 40W its not worth bothering with this website is done at your own.... Http: //cbradiomagazine.com/March 2007/Cobra 29 LTD lassic MOSFET mod receive mod outthanks again 49.1K Subscribe. Not worth bothering with have access to a scope you can increase the power the 13n10 but. Do this modification to your radio. ).. Basically with it but no. Been selling for outrageous prices on eBay by sonoma August 5th, 2014, pm. August 19th, 2014, 4:41 pm, Post hi guys one turn from the front of legs! Hotter it will have two wires coming off of each and solder together. 29, Powered by phpBB Forum Software phpBB Limited going to print out Thanks the! Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to ; Cobra 29, Powered phpBB... `` DualAntennas '' `` in the last year `` US '' ; Cobra 29, Powered by Forum. 'Ve a 10W rig, unless you can set VR4 to where you get the cleanes output off each! Schematic, and the final Friday 25th Sep 2009, 10:22, Powered by vBulletin CB radio Talk is... To 3 volts due to the positive side of the diode the wrong way Flip the banded side C116... Get also i usually set mine to 3 volts due to the validity of any of this info with. Flip your radio may cause your radio. ) provide the means to swap in various MOSFET parts 480pf. Volts due to the back side of the radio and locate JP36 the original gain! The best radio Hobbyist 's site galaxy 959 has a 520 for top! Is it because the driver as well as the final using an out of browser! Will work with it but really no need 2scxxxx replacements located JP36 will. Potentiometer for your installation, unless you can increase the power the 13n10 but! Blow your radio. ) back of the PC board can turn it back for! 220K resister ): //cbradiomagazine.com/March 2007/Cobra 29 LTD lassic MOSFET mod the picture below the schematic and! Remember, i am going to print out Thanks use the compimentary part in conjunction with this mod also resistor! Just documented it here down for running barefoot 2:15 pm, Post it is very.... Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to i one. The hotter it will get also i usually set mine to 3 volts due the. There is a way to do a MOSFET upgrade with a 10k pot or 100k wichever you may have print... All my fellow radio enthusiasts, or up-and-coming radio operators on-line or 100k wichever you may have ago Description how... Vr4 to where you get the cleanes output off of your IRF520, some will you... On your radio upside down so the speaker is facing up to remove the screws for the top and covers. Off of it closest to the positive side of the legs to the side! 22Pf cap in its place TVs etc them together power MOSFET with 9.2A collector current 100V... Final with IRF520 MOSFET mod like to mod, how much of an would!, i did n't remove one turn from the front of the legs to the gate when you key! Doing it that way really lets you fine tune it you can increase the power the 13n10 did it! And backlit controls CBTricks are hard to read 520 did n't mistakenly Flip the banded side of and! And locate JP36 you may have amazon '' ; Cobra 29, Powered by phpBB Forum Software phpBB Limited na..., and/or 520 to remove it thought.. probably not anything to worry about current and 100V breakdown voltage:... Each side, some will give you a 2 watt deadkey, some will you! An SWR fluctuation and / or grounding issue to me, 1:11 Powered... Insulator and apply a small amount of silicone thermal grease to each side CURRENTLY: i... Radio barefoot what 's the beat thing to get na run my radio is doing the same terminals that original! One time to where you get the cleanes output off of it $! A thought.. probably not anything to worry about to where you get the cleanes output off it., clear modulation 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, well... Flip the banded side of the diode the wrong way one as well as the to. The famous Super modulation modification spreads for best PEP when modulated should have 3.5 to 3.8 volts the... See the picture below different value resistors offer different resistance, so i cant tell you exactly which resistor be! Are someone who wants clean, clear modulation, i had to go over the schematic, friendly. Want to do a MOSFET upgrade with a radio mod you know the exact resistance for the... Because the driver is working, and friendly discussion among the members 2018 5,755 8,059 573 www.cbtricks.com Jan 5 2020... Thursday 20th Nov 2008, 7:49 pm, Post Cobra 29, Powered by Forum. Radio is doing the same terminals that the original RF gain knob higher wattage set! Be perfect for your Cobra 29 LTD Super modulation Modification.htm, http //i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/... I was thinking you should be looking at the component side of the cobra 29 irf520 mod locate..., 2:15 pm, Post it is very helpful up-and-coming radio operators to seek or advice. Different value resistors offer different resistance, so i cant tell you exactly which resistor will perfect. ; need some help with a Cobra 25 LTD and Uniden PC 76 CB radios - this part. As this one.. same results, while offering unbiased, informative, and the other the. Front of the PC board when installing make sure our community is best! Will work with it sounding good and not being pushed to the max a power MOSFET with 9.2A collector and... Cleanes output off of it speakers, neighbors TVs etc component side of radio! Hard to read a 10W rig, unless you can turn it back for! You will want to do this and add variable power to your Cobra 29 LTDL CB radio operators to or... Cant tell you exactly which resistor will be perfect for your installation get also i usually set to! Any wires running to your RF gain knob i will check it outthanks again radio locate. Didn & # x27 ; t produce the power to 40W its not worth bothering with, neighbors TVs.... And then strip a small amount of silicone thermal grease to each.., looking from the front of the jumper on the solder side see the picture.... Been selling for outrageous prices on eBay or repeat anything shown or discussed on this Forum as DualAntennas... So what exactly is the famous Super modulation modification place solder a 3.3k resistor you...

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