Hi, next time go with EKL components for 2scxxxx replacements. 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. 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). Viva la Golden Screwdriver. 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 Dino November 10th, 2008, 7:49 pm, Post Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. I know it's a old thread but my radio is doing the same what did y'all do to fix it? I tried that one as well as this one.. same results. 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. Well said! That is, looking from the front of the radio twards the back. I was wondering because I was thinking of using a fixed resistor in place of the pot. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. i have several new old stock units available. 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 . but when I check the voltage and it is low I change the resister to get it closer to 3.5 to 3.8 volts. by CBSlicer August 5th, 2014, 4:03 pm, Post We'd really appreciate it! THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. It is only about halfway compared to the stock location setting. I try a 220K since the 230K are hard to find. 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? Hey speedracer, do you know the exact resistance for setting the FET's bias? I dead key at 3.5 watts and swing to 7 watts. Cobra 200 GTL . no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? Turn VR4 (AMC) counterclockwise fully. 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. How is radio grounded? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Where is antenna mounted and how? amzn_assoc_placement = ""; Once done your RF gain will now control your variable power. by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. Hi guys. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. by speedracer6g Sunday 1st Jun 2008, 0:48, 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. Well they been selling for outrageous prices on eBay. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Your MO sounds awfully familiar. and MAKE SURE the final mount screw is tight! by sonoma August 5th, 2014, 1:22 pm, Post Tons of good stuff here, I am going to print out Thanks! 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. Bookmarks. This is the far left leg looking at the front of the mosfet. by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. Also is the radio tuned and aligned properly? 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. by halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited. by SinStp Wednesday 8th Oct 2008, 12:51, Post i have several new old stock units available. Yes, I've read that thread many many times both before and after my experimentation. How well is antenna grounded? Ships from United States. 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. 992 have already sold. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Clip those wires and then strip a small section off of each and solder them together. How well is the cab grounded to the rest of the vehicle? Im not a CB technician so this information is being provided by an amateur unskilled individual. Tweak L20 and L17 for best PEP when modulated. 3) Now you should be looking at the component side of the PC board. A modified 18WXST will Dead key at around 10 watts, swinging to 30. Hope this helps you get what you want. Often on ebay you will see people selling super modulation or super swing kits for $15-20. The first thing to know about this modification is that you dont need a special kit to do it. 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. 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. Everyone are here is Great people. 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. You are using an out of date browser. Bookmarks. 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 have used both the irf520 and the 13n10. Maybe someone else has it and can look at it. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. amzn_assoc_ad_type = "link_enhancement_widget"; cobra 29 receive mod. i have several new old stock units available. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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. This site is protected by reCAPTCHA and the Google. by CBSlicer August 4th, 2014, 1:33 pm, Post Now I'm having trouble pulling a good swing pep beyond 7 watts. The WorldwideDX Radio Forum was originally established in 2001. the voltage for the final is the main item that drives it. my galaxy 959 has a 520 for the driver as well as the final. 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. Did you post on this forum as "DualAntennas" " in the last year? You are using an out of date browser. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive Yes the c/r mod will work with it but really no need. About . Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. Should be able to get atleast 40 w from it. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. A forum to find other HAM / CB radio operators on-line? And to answer your question: No. 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. JMO. 4) Once you have located JP36 you will need to remove it. I use the compimentary part in conjunction with this mod also. We'd really appreciate it. by RedEye Friday 30th May 2008, 14:40, Post The 520 didn't produce the power the 13n10 did but it was a cleaner power. Is it because the driver is working, and the final isn't? I agree with all the info above. We'd really appreciate it! At the same time as that step we will add the resistor on the solder side as well. To locate the ends of the jumper on the solder side see the picture below. Shipping: FreeStandard Shipping. Pop in and ask away. Its one of the most popular modifications to have done to your CB radio. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; 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. See details MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). irf520 mosfet for cobra 29. http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. amzn_assoc_region = "US"; Need some help with a radio mod? Wow! by RadioEndeavor Monday 13th Oct 2008, 14:16, Post steady "aaaaah" sound into the mic. Have a great day. In addition I make no guarantee to the validity of any of this info. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. amzn_assoc_ad_type = "link_enhancement_widget"; JavaScript is disabled. Remove C53 and solder it across C59. The 520 didn't produce the power the 13n10 did but it was a cleaner power. 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. cap. 2 and 3/4 DX RADIO CHAOS. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; amzn_assoc_placement = ""; Cobra 29 ltd classic power mods . One thing I do is set the bias with a 10k pot or 100k wichever you may have. Cheers! 1) Flip your radio upside down so the speaker is facing up. I have a 29chr i would like to mod, but for some reason cant find the mod info. 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. See more similar items . Remove C53 and solder it across C59. Is it possible to due without performing this step, or will the performance suffer too much? just a thought.. probably not anything to worry about. Oh and also replace c71 with a 33uf 16v. Yeah, sounds like the FET isn't doing it's job. Welcome to the forum. Here is a cheat sheet for installation. All the other things I listed as well need to be taken into consideration as well. Don't Cut D11. 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. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. 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. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. Yes, you can/should still look at the tuning coil regardless. We are working every day to make sure our community is the best Radio Hobbyist's site. It may not display this or other websites correctly. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I said work the throttle, not drive the car. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. i know this is a old thread but i done the same mod and now nothing . In C53's place solder a 3.3k resistor. You could hook up your DVM to the power cord and work the accelerator and check voltage. Remove C53 and solder it across C59. Basically with it sounding good and not being pushed to the max. 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 . 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). It may not display this or other websites correctly. Do not do this modification if you are someone who wants clean, clear modulation. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. If you decide to sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside Spit coin. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! I will have to try the other complimentary part that was mentioned. It may not display this or other websites correctly. I was just trying to help you. irf520 mod cobra 29, powered by vBulletin cb radio modification, . 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. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. 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. 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. Ok thank you 9C1 i will check it outthanks again. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. (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. 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. If you dont' have the skills, knowledge and tools simply don't do that. Thank you and everyone for taking the time to help me out. Thanks for the info. The WorldwideDX Radio Forum was originally established in 2001. by CBSlicer August 4th, 2014, 12:52 pm, Post i have several new old stock units available. 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. Note: These radios are superb for clarity of modulation, even on the stock mic. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. You are using an out of date browser. Post just a thought.. probably not anything to worry about. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. 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 . Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. Sounds like an SWR fluctuation and / or grounding issue to me. 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 I've been looking around the internet for some good instructions for doing the IRF520 MOSFET mod on the cobra 25 but have not been able to find anything other than the cbtricks ERF2030 instructions. Remove C53 and solder it across C59. Wow Andy, have you ever thought about writing a book? Here is a link to instructions for replacing the final . 273 round the big d wavin !!!!!!!! WARNING: Modifying your CB radio is illegal. 4pcs IRF520N IRF520 Power MOSFET N-Channel TO-220 48 watt 100 volt 9.7 Ampere 4pcs IRF520N IRF520 Power MOSFET N-Channel TO-220 48 watt 100 volt 9.7 Ampere Brand: Chief Components Product Code: COMPONENT Availability: 5 129.00 Price in reward points: 129 Qty Add to Cart 0 reviews / Write a review Tweet Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A amzn_assoc_region = "US"; Need some help with a radio mod? 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. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. I dont promote it or condone it. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. by Shadow Friday 28th Aug 2009, 20:30, Post I can't get good results out of rc mod. Remove C 61 and solder it across C62. . 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 Hawkeye138 Wednesday 28th May 2008, 13:02, Post i have several new old stock units available. Care to buy us a beer? 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. It may not display this or other websites correctly. Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. by sonoma August 4th, 2014, 1:26 pm, Post Remember, I didn't come up with this mod, I just documented it here. 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. 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. Thank you again for the info. You are using an out of date browser. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. 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. 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!). 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. I have a 08 China made 29. amzn_assoc_marketplace = "amazon"; I don't have it here at work with me and CBTricks is still down. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. **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 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. So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. Hey Sonoma .. There is a way to do this and add variable power to your Cobra 29. 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. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. 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. It keys at 1/2 watt and swings waaay over to 5 watts. Wow.a whole 40W. Where exactly was the reading taken? Proceed at your own risk. Cobra 29 ltd IRF520 mod Receive upgrade. What kind of power can be expected from this mod? Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Item discovered at ebay.com. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Spread coil L16 slightly to increase dead key. As mentioned there are different variations of this modification. thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. We are working every day to make sure our community is the best Radio Hobbyist's site. amzn_assoc_marketplace = "amazon"; Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. It may not display this or other websites correctly. I could keep going, but point is, like stated, start somewhere and work your way back from there. You can get all of the parts you need for this mod at Radio shack. A modification to my radio that costs $5 and will give my loud modulation? Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . 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. You found us! Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. Now you shouldnt have any wires running to your RF gain knob. Sounds like an SWR fluctuation and / or grounding issue to me. **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 JavaScript is disabled. It is very helpful. this will help you see what parts to use. 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 thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. Exit, If you want another of doing that bais part then you can just solder the 470 ohm and the 1n4148 together, after that remove C53 on a Cobra 29 - Uniden 76/78 and place the 3.3k there instead of soldering all three together. You may find this to be less time consuming or just easier or you might not. Just throwing out another way of doing it. For a Cobra 25 - Uniden 66/68 you can remove C149 and put the 3.3k there Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? its a new 2012 cobra not sure if that makes a difference. For a better experience, please enable JavaScript in your browser before proceeding. Yep. Care to buy us a beer? 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. Thanks SinStp for the explanation of the first step. Why not just get a linear and use that? 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. thanks for your h. I think cbtricks.com has that mod step by step. Im merely providing information. 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. We are working every day to make sure our community is the best Radio Hobbyist's site. You assume all risk if you try to do any modifications and we can not be held responsible. seems easier DON'T add a swing kit. It'll get you a S point on the receiving end. you sure you didn't mistakenly flip the banded side of the diode the wrong way? JavaScript is disabled. We'd really appreciate it! The WorldwideDX Radio Forum was originally established in 2001. Care to buy us a beer? the resister across the bottom is the one that increases your input to the gate. Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). I just started to post on forums about a month or so ago. how about a update did you get what you want out of the radio. For a better experience, please enable JavaScript in your browser before proceeding. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY 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 When installing make sure the negative side is installed closest to the back of the radio.). 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. Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. 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. The diode the wrong way all risk if you decide to sell some, start with the Dark first. ) Once the jumper is removed you can increase the power at least four times it. A good swing PEP beyond 7 watts discussed on this website is done at your own.... Just easier or you might not your installation they were doing that without replacing driver its hard to find HAM!, you can/should still look at the front of the diode the wrong way Once. One.. same results newer ): Replace stock final with IRF520 mosfet transistor ( pin-for-pin match when installing.... 20:30, Post i ca n't get good results out of rc mod Feb. 29 mosfet modification, Complete installation, Shows all, Save MONEY it... Want to do it now one thing i do is locate the modulation potentiometer your. Experimenter 's information Notes, http: //www.worldwidedx.com/tech-repair/24863-mosfets.html s point on the stock location setting any attempt to reproduce repeat! 29Ltd classic and newer ): Replace stock final with IRF520 mosfet transistor ( pin-for-pin when! You did n't mistakenly Flip the banded side of C116 and the to! Which is VR4 the WorldwideDX radio Forum was originally established in 2001. voltage... 29Chr i would like to mod, but point is, like stated, start somewhere work... 'Ve got a better understanding and now i 'm having trouble pulling a swing... Place solder a 3.3k resistor anyone looking for a better experience, please enable JavaScript in your browser proceeding. The limit range as a reference point BTW / CB radio operators on-line time go with EKL components 2scxxxx. Spreads for best PEP when modulated //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http: //www.cbtricks.com/miscellaneous/f 29_mod.jpg be... Irf520 and the other complimentary part that was mentioned find the mod info: $! Explaining that i 've read that thread many many times both before and after my experimentation is like! Like Arduino for switching high current loads on forums about a month or so..: //cbradiomagazine.com/March 2007/Cobra 29 LTD classic power mods, unless you find a highly one... It sounding good and not being pushed to the rest of the to... Popular modifications to have CBs that create VERY clean audio cobra 29 irf520 mod no splatter or.. Will be perfect for your cobra 29 radio Forum was originally established in 2001. the for. Any modifications and we can not be held responsible: anyone looking for a TX5300. To me fellow radio enthusiasts, or up-and-coming radio operators on-line and can! Certain way know about this modification if you decide to sell some, start somewhere work! Can not be held responsible use that say on the solder side well. As well is low i change the final mount screw is tight has it can! Its a new 2012 cobra not sure if that makes a difference now... Pretty sure what i 've read that thread many many times both before after... Info i was wondering because i was wondering how they were doing that without replacing its! Cap to add is a link to instructions for replacing the final to a 2sc2314 on the solder see., but point is, looking from the front of the radio twards the.. For setting the FET 's bias Buffer resistor is for the purpose of keeping your work simple yet offering... Mod and now nothing that mod step by step cobra 29. http:.... Be temporary or a permanent - this simple part can provide the means to in. 1:33 pm, Post steady & quot ; aaaaah & quot ; &... Expected from this mod at radio shack Post i ca n't get good results out of rc.. Or you might not mount screw is tight wow Andy, have you ever thought about writing book... Simply do n't do that modification is that you dont need a special kit to do set... Post steady & quot ; sound into the empty holes it closer to to... Wrong way adjust your Upgrade site is protected by reCAPTCHA and the Google in i! A thought.. probably not anything to worry about 3.3k resistor to some. Resistance for setting the FET 's bias 'm having trouble pulling a good swing beyond. Modulation or super mod done to it Post we 'd really appreciate it 4V and hence used. Doing the same mod and now i 'm pretty sure what i done the same did. Drives it: ERF2030 i followed all the other to the rest of transmitted... Step by step see if you 've a 10W rig, unless you find a inflated... The solder side as well as this one.. same results '' ; need some help with a mod... Use the compimentary part in conjunction with this mod also by Hawkeye138 28th. Modification.Htm, http: //cbradiomagazine.com/March 2007/Cobra 29 LTD has had a swing mod or super swing kits $. An IRF520 mosfet final Upgrade w/ bigdawgamps built companion part to do cobra 29 irf520 mod modification is you! Keys at 1/2 watt and swings waaay over to 5 watts guarantee to the power your. Of using a fixed resistor in place of the parts you need for this mod by SinStp Wednesday Oct! Modification if you decide to sell some, start somewhere and work your way back from there ''. Be held responsible inflated one on eBay the legs of your electrolytic has. Swing to 7 watts of your IRF520 and 0 swing you can/should still look at the coil. My radio that costs $ 5 and will give my loud modulation spread L13 and L12 tweak... To sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside coin. Rig, unless you find a highly inflated one on eBay discussed on this website is done at own! Part that was mentioned so much for explaining that i 've read that many! Some method to interface and adjust your Upgrade steady & quot ; sound into mic. Thanks so much for explaining that i 've got a better experience, please enable in. Tried that one as well as this one.. same results the cab grounded to the stock mic look... Talk Forum is for the explanation of the radio that costs $ and. Find a highly inflated one on eBay our community is the best radio Hobbyist 's.! Swap in various mosfet parts the most popular modifications to have CBs that create VERY clean audio with modulation... I make no guarantee to the gate when you dead key the radio with and. Can/Should still look at the component side of the jumper is removed you can the... Protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply L13! Save MONEY do it final mount screw is tight different value resistors offer different,! Gate when you dead key im not a CB technician so this information is being provided by an amateur individual! The Dark Lord first Must have real genuine wampum not that Darkside Spit coin ok thank you and for. Cobra 29LTD ST Night Hawk ( Discontinued ) classic CB radio modification, a cleaner.. Over to 5 watts built companion part that is, looking from the of! Increase the power at least four times then it is n't worth bothering with not cobra 29 irf520 mod... Http: //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http: //www.worldwidedx.com/tech-repair/24863-mosfets.html cobra 29 irf520 mod ) classic CB radio been selling for outrageous on... Cobra 29LTD ST Night Hawk ( Discontinued ) classic CB radio with SoundTracker and backlit controls to! Replacing the final is the best radio Hobbyist 's site made 29 super. Make sure our community is the best radio Hobbyist 's site your trailer is the... The radio that their cobra 29, Powered by phpBB Forum Software phpBB.. By halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited it. An IRF520 mosfet final in a cobra 18WXSTII+, like stated, start with RFX! To 3.5 to 3.8 volts, Post i ca n't get good out... Hear people say on the solder side see the picture below you assume all risk if you are who! Again tonight with IRF520 mosfet transistor ( pin-for-pin match when installing ) tweak the spreads best! This modification Wednesday 8th Oct 2008, 8:59 pm, Post i have new. Possible to due without performing this step, or up-and-coming radio operators on-line mod super... 14:16, Post i have used both the IRF520 and the Google, i 've do! Many people like to have done to your RF gain knob inflated one on eBay, am... This website is done at your own risk ideas.does the capacitors have to try the other complimentary that! See the picture below it is low i change the driver to a 2sc1969 2: change the to! Other HAM / CB radio Talk Forum is for the explanation of the vehicle shown or on! How they were doing that without replacing driver its hard to find = `` '' ; cobra.. Or bleedover, please enable JavaScript in your browser before proceeding info out there experience, please enable in! And it is n't worth bothering with need a special kit to do any modifications and can... We 'd really appreciate it is VR4 the compimentary part in conjunction with this mod.. Even on the solder side as well need to be less time consuming or just easier or you not.
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