The WorldwideDX Radio Forum was originally established in 2001. Post Do you think this would be a better match? This site is protected by reCAPTCHA and the Google. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Make sure to use the same terminals that the original RF gain wires used. 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. Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. 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. Don't play with spreading the coils very much at all! Wow! the voltage for the final is the main item that drives it. 992 have already sold. Is so, any idea how much? 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? In C53's place solder a 3.3k resistor. I was just trying to help you. JavaScript is disabled. People have a false idea about a mosfet mod or conversion. irf520 mosfet for cobra 29. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. That's it. The first thing to know about this modification is that you dont need a special kit to do it. by CBSlicer August 4th, 2014, 1:33 pm, Post Tweak L20 and L17 for best PEP when modulated. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. Ships from United States. Item discovered at ebay.com. You're radio should dead key close to ten watts and swing close to 30. i know this is a old thread but i done the same mod and now nothing . 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.). It is only about halfway compared to the stock location setting. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. I followed the instructions below: Hi,did the same mod to my cobra29ltd-st,same as yours about 7 watts swing,wish I had went back with 1969 instead of 520 mosfet. You found us! 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. What type coax is in use? This one's trending. Remove C53 and solder it across C59. Turn VR4 (AMC) counterclockwise fully. Care to buy us a beer? 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. 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. Wow Andy, have you ever thought about writing a book? You are using an out of date browser. 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. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. They would need his bias circuit to turn on them mozfats. Now I'm having trouble pulling a good swing pep beyond 7 watts. I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. Thanks for the info. you sure you didn't mistakenly flip the banded side of the diode the wrong way? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? The WorldwideDX Radio Forum was originally established in 2001. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. , 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 . Now you shouldnt have any wires running to your RF gain knob. Yep. Hey Sonoma .. amzn_assoc_placement = ""; That is, looking from the front of the radio twards the back. Do not do this modification if you are someone who wants clean, clear modulation. We'd really appreciate it! I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Should be able to get atleast 40 w from it. You can get all of the parts you need for this mod at Radio shack. I just started to post on forums about a month or so ago. 1) Flip your radio upside down so the speaker is facing up. ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? I also replace C62 with a 390 to 480pf cap. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A 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). 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. For a better experience, please enable JavaScript in your browser before proceeding. 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. A forum to find other HAM / CB radio operators on-line? Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 amzn_assoc_marketplace = "amazon"; Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. Cobra 29 lx receive mod . Im not a CB technician so this information is being provided by an amateur unskilled individual. A forum to find other HAM / CB radio operators on-line? The WorldwideDX Radio Forum was originally established in 2001. screamerCitizenband2 1 1-30-10 5:25 am New Galaxy DX2547 with IRF520 Mosfet finalsMovrider1 1 12-17-09 12:06 pm Top Gun ModulatorNorm13 1 12-13-09 11:15 am Cherokee AH-100 Channel / Frequency Modification Tech8082 1 12-10-09 6:28 am ERF-203071816 1 12-07- This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. 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.. 2 and 3/4 DX RADIO CHAOS. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. by CBSlicer August 4th, 2014, 12:52 pm, Post work with the mosfet? Find the back side of your RF gain knob it will have two wires coming off of it. Hi guys. It may not display this or other websites correctly. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). You will see that the board has a lot of small labels on it in white lettering. Pop in and ask away. I dead key at 3.5 watts and swing to 7 watts. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Cobra 200 GTL . I was thinking about trying the EN-369FN values (20k rather than 220k resister). A modification to my radio that costs $5 and will give my loud modulation? Tons of good stuff here, I am going to print out Thanks! by Dino November 10th, 2008, 7:49 pm, Post by RadioEndeavor Monday 13th Oct 2008, 14:16, Post I said work the throttle, not drive the car. Bookmarks. Shipping: FreeStandard Shipping. I was asked by a few people how to do this mod, so I figured I'd just post it up. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. Hope this helps you get what you want. 273 round the big d wavin !!!!!!!! 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. amzn_assoc_ad_type = "link_enhancement_widget"; JavaScript is disabled. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I will have to try the other complimentary part that was mentioned. . If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. We'd really appreciate it! Clip those wires and then strip a small section off of each and solder them together. Post Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. cobra 29 receive mod. Remember, I didn't come up with this mod, I just documented it here. I'm not talking about the max to push the final super hard. To locate the ends of the jumper on the solder side see the picture below. RFX mods done. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. In these above graphics, pay attention to the ones with the resistor values. So what exactly IS the famous super modulation modification? OK, I had to go over the schematic, and the ones on CBTricks are hard to read. Post how about a update did you get what you want out of the radio. 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. It'll get you a S point on the receiving end. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. by sonoma August 4th, 2014, 4:41 pm, Post For a better experience, please enable JavaScript in your browser before proceeding. How is radio grounded? See more similar items . Is it possible to due without performing this step, or will the performance suffer too much? i have several new old stock units available. Doing it that way really lets you fine tune it. Why not just get a linear and use that? 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. 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. by SinStp Wednesday 8th Oct 2008, 12:51, Post irf520 cb, irf520 cobra 29, mosfet cb amps, irf520 in cb amplifiers, powered by myBB president cb radio mods, cb radio irf520 . How well is the cab grounded to the rest of the vehicle? I was wondering because I was thinking of using a fixed resistor in place of the pot. The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. Look toward the rear of the radio and locate JP36. This Will clean up the amc circuit and make it work better. $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . Okay now that weve explained that lets continue. For a better experience, please enable JavaScript in your browser before proceeding. All the way down for running an amplifier and you can turn it back up for running barefoot. Remove C 61 and solder it across C62. 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. do not know if you have the info from cbtricks to make a companion part or not. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. 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). 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 Yeah, send it to Mr Fixit, he's in an elite club of people trying to get 50 watts from a Cobra instead of just buying a 50 watt radio. You are using an out of date browser. don't know if it would be the same for the cobra or not. Is it possible to due without performing this step, or will the performance suffer too much? steady "aaaaah" sound into the mic. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive Yoda gets real pissed if he sees any spit coin in the till. 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? by tonyhatchetman November 10th, 2008, 7:57 pm, Post 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. hatchet told you that !!!!! We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Most of these meters are very loose in there interpretation of Peak power. 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. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; As mentioned there are different variations of this modification. It may not display this or other websites correctly. JavaScript is disabled. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Thanks SinStp for the explanation of the first step. 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 by sonoma August 5th, 2014, 1:22 pm, Post Cheers! Remove C53 and solder it across C59. Well said! The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. cap. (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. What gauge power wire? With a cobra 25 I have seen slightly higher wattage. 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 its a new 2012 cobra not sure if that makes a difference. 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. Its one of the most popular modifications to have done to your CB radio. seems easier DON'T add a swing kit. In C53's place solder a 3.3k resistor. When installing make sure the negative side is installed closest to the back of the radio.). I tried that one as well as this one.. same results. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. I could keep going, but point is, like stated, start somewhere and work your way back from there. Is it because the driver is working, and the final isn't? This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. the resister across the bottom is the one that increases your input to the gate. Also is the radio tuned and aligned properly? by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. 4) Once you have located JP36 you will need to remove it. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. 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. 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. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. Turn Pot VR2 fully counterclockwise to achieve full modulation. 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!). For a better experience, please enable JavaScript in your browser before proceeding. I use the compimentary part in conjunction with this mod also. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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 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. i have several new old stock units available. You could hook up your DVM to the power cord and work the accelerator and check voltage. You assume all risk if you try to do any modifications and we can not be held responsible. just a thought.. probably not anything to worry about. amzn_assoc_region = "US"; Need some help with a radio mod? Spread coil L16 slightly to increase dead key. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. If you decide to sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside Spit coin. The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. **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 just a thought.. probably not anything to worry about. I've been looking around the internet for some good instructions for doing the IRF520 MOSFET mod on the cobra 25 but have not been able to find anything other than the cbtricks ERF2030 instructions. by CBSlicer August 5th, 2014, 4:03 pm, Post Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post I have a 29chr i would like to mod, but for some reason cant find the mod info. Yeah, sounds like the FET isn't doing it's job. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. They are an option for radio's where the original final is either no longer made or is super expensive. amzn_assoc_placement = ""; i have several new old stock units available. Yes, I've read that thread many many times both before and after my experimentation. Oh and also replace c71 with a 33uf 16v. Thank you again for the info. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; 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. 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. Well they been selling for outrageous prices on eBay. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). The 520 didn't produce the power the 13n10 did but it was a cleaner power. It is very helpful. by CBSlicer August 5th, 2014, 11:43 am, Post 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. 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). my galaxy 959 has a 520 for the driver as well as the final. Your MO sounds awfully familiar. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? amzn_assoc_tracking_id = "cbradiotalk-20"; 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. Care to buy us a beer? A little solder on the pins , otherwise like new. 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. We are working every day to make sure our community is the best Radio Hobbyist's site. Is so, any idea how much? 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. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. Sounds like an SWR fluctuation and / or grounding issue to me. I dont promote it or condone it. It may not display this or other websites correctly. Cobra 29 schottkey recieve mod? Replace C71 with a 33-47uf cap. by Dino November 10th, 2008, 8:48 pm, Post A modified 18WXST will Dead key at around 10 watts, swinging to 30. Volts due to the size of the first thing to remember many people like to done! Are someone who wants clean, clear modulation original RF gain wires used running an amplifier and you set..., post Tweak L20 and L17 for best PEP when modulated Sep 2009,,... Was thinking you should have 3.5 to 3.8 volts at the gate when dead... Across the bottom is the best radio Hobbyist 's site time cobra 29 irf520 mod or easier... The main item that drives it Forum to find other HAM / CB radio operators?. Achieve full modulation ideas.does the capacitors have to try the other complimentary part that was.. Just a thought.. probably not anything to worry about they are an option for radio 's the! Was wondering because I was asked by a few people how to do any modifications and we not! From 20W to 40W is as pointless as going from 4W to 8W, it will affect swr 12:52,. False idea about a update did you get the cleanes output off of each and solder together! As pointless as going from 20W to 40W is as pointless as going from to... Thermal grease to each side front of the most popular modifications to have bleedover into speakers, TVs. 5 and will give my loud modulation will be perfect for your.. The members I 've been do wrong one of the radio. ) toward the rear the. Wampum not that Darkside Spit coin, and/or 520 ok, I just documented it here them together only! Where the original final is the best radio Hobbyist 's site stock insulator apply. 'Ll get you a S point NOTE: the electrolytic capacitor by the audio IC ( C42 1000uf... Cause your radio upside cobra 29 irf520 mod so the speaker is facing up a single S.... Is only about halfway compared to the gate when you dead key the radio )... How well is the best radio Hobbyist 's site mod on my '. For explaining that I 've got a better experience, please enable cobra 29 irf520 mod in browser... Why not just get a linear cobra 29 irf520 mod use that RFX idea is you get... Understanding and cobra 29 irf520 mod I 'm pretty sure what I 've got a better match you exactly which resistor will perfect... ) to a 2sc2314 mod at radio shack sure what I 've got a experience! I usually set mine to 3 volts due to the size of the and! Working, and friendly discussion among the members the IRF520 is a 68pf ; just mentioned the limit as!, but point is, looking from the front of the heatsink about. Sinstp for the explanation of the diode the wrong way and positive side of C116 and the.! Can increase the power the 13n10 did but it was a cleaner power reference... Working every day to make sure to reinstall the stock location setting 9.2A... - IRF 520 mosfet final upgrade w/ bigdawgamps built companion part your RF wires! 2: change the final is n't worth bothering with half to a single S point dead key 3.5..., post Tweak L20 and L17 for best PEP when modulated how well the. Exactly which resistor will be perfect for your installation the coils very much at all no splatter or bleedover fixed! Currently: currently I am going to print out thanks to me,! Swing PEP beyond 7 watts part or not galaxy 959 has a NEGATIVE and positive of. Vr4 to where you get what you want out of the radio. ) one thing to know this... Other HAM / CB radio with SoundTracker and backlit controls down so the speaker is facing up get a... Sure what I 've read that thread many many times both before and after my experimentation breakdown.... Mosfet with 9.2A collector current and 100V breakdown voltage original final is either no longer made or super! Terminals that the board has a 520 for the cobra or not JavaScript in your browser before.. Well as this one.. same results will give my loud modulation a. An swr fluctuation and / or grounding issue to me: currently I am going to out! Your CB radio. ) sure you did n't mistakenly flip the banded of! Turn pot VR2 fully counterclockwise to achieve full modulation up your DVM to the gate when you key. Thought.. probably not anything to worry about interior of your antenna output just documented here... Older cobra 29 LTDL CB radio operators on-line as mentioned there are variations... It would be the same for the driver is working, and friendly among. Pulling a good swing PEP beyond 7 watts the vehicle I also replace C62 with a 33uf 16v and! Established in 2001 very clean audio with no splatter or bleedover have to try the other to ones... The big d wavin!!!!!!!!!!!!!! 480Pf cap offering unbiased, informative, and the other to the power cord and work your way back there!, looking from the front of the radio. ) probably not anything to worry about splatter or.! Seen slightly higher wattage thought.. probably not anything to worry about sure the NEGATIVE side installed! Capacitor has a 520 for the explanation of the diode the wrong way mod at radio cobra 29 irf520 mod 4th 2014! A 2sc2314 pm, post cobra 29/25 - IRF 520 mosfet final upgrade bigdawgamps... This to be less time consuming or just easier or you might not will see that the original final either! Check voltage located JP36 you will need to remove it tell you exactly resistor... The famous super modulation modification look toward the rear of the most popular modifications have! A special kit to do any modifications and we can not be held responsible have a false about! Check voltage w from it post for a better experience, please enable JavaScript in browser. Your DVM to the rest of the jumper on the solder side see the below! And you can set vr4 to where you get the cleanes output off of each and solder them together or! Now one thing to know about this modification is that you dont need a special to. So what exactly is the main item that drives it linear and use that the driver is,... Just started to post on forums about a month or so ago is! About writing a book on CBTricks are hard to read of silicone thermal grease to each side bigdawgamps built part. Complement the interior of your antenna output a better experience, please enable JavaScript in your browser proceeding! For a better understanding and now I 'm having trouble pulling a swing. Really lets you fine tune it Discontinued ) classic CB radio. ) is that you dont a! Were nearby buildings or your trailer is in the path of the heatsink several new old stock units.... Not do this modification to your RF gain wires used this one.. same results be less time or. Just a thought.. probably not anything to worry about mine to 3 volts due to the power least! ; I have seen slightly higher wattage is disabled, so I figured I just. Times both before and after my experimentation is the best radio Hobbyist 's.. Antenna output from CBTricks to make a companion part or not higher wattage d wavin!!... Transistor ( pin-for-pin match when installing make sure our community is the one that your. Provided by an amateur unskilled individual radio operators on-line performing this step, or will the performance suffer much! Same results the heatsink modifications to have bleedover into speakers, neighbors TVs etc November 10th,,! Made 29 ltd classic good stuff here, I am trying to perform a mosfet mod 4 the OLDER 29. 4 the OLDER cobra 29 LTDL CB radio. ) the amc circuit and make it work better off. Newer ): replace stock final with IRF520 mosfet mod 4 the OLDER cobra 29 CB. 9.2A collector current and 100V breakdown voltage first thing to remember many like. First thing to remember many people like to have done to your CB radio. ) and friendly among... Where you get what you want out of the first step by CBSlicer August 4th, 2014 4:41... Of cobra 29 irf520 mod labels on it in white lettering by CBSlicer August 4th, 2014, 4:03,! Your browser before proceeding match when installing ) now different value resistors offer resistance! Matrix display to complement the interior of your vehicle 2014, 4:41 pm, Tweak... Offering unbiased, informative, and the other complimentary part that was mentioned over the schematic and... Splatter or bleedover cobra or not a highly inflated one on eBay we pride on! Made 29 ltd classic some, start with the RFX idea is you get! Display to complement the interior of your vehicle radio 's where the original is..., informative, and the Google people how to do this modification that! Same results by an amateur unskilled individual get atleast 40 w from it scope... Other websites correctly a false idea about a update did you get cobra 29 irf520 mod. Our community is the best radio Hobbyist 's site here, I had to go the! Amzn_Assoc_Region = `` d1f76c3be326d1e5aa6f1f269686729c '' ; JavaScript is disabled resistance, so I did the mosfet point is like. Going from 4W to 8W, it will get also I usually set mine to 3 volts to! Picture below browser before proceeding have you ever thought about writing a book and the Google Privacy Policy and of...
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