We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. The WorldwideDX Radio Forum was originally established in 2001. 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. 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? http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. by RedEye Friday 30th May 2008, 14:40, Post by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. There are just too many variables. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? 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. its a new 2012 cobra not sure if that makes a difference. It may not display this or other websites correctly. Hey speedracer, do you know the exact resistance for setting the FET's bias? 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). Yes the c/r mod will work with it but really no need. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. And I agree about clean sounding radio I installed a super talk kit in a 29 yea it was loud on 4 channels it came out as quick as it went in lol thanks again. amzn_assoc_ad_type = "link_enhancement_widget"; Remove R56 and in its place install a 470-ohm resistor in series with a common switching diode (1n914 or similar), with the banded end of the diode towards the front of the radio. Remove R56 and in its place install a 470-ohm resistor in series with a common switching diode (1n914 or similar), with the banded end of the diode towards the front of the radio. Spread coil L16 slightly to increase dead key. Now you shouldnt have any wires running to your RF gain knob. 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. The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. Once done your RF gain will now control your variable power. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. It'll get you a S point on the receiving end. Information presented is opinion and not expert advice. Remember, I didn't come up with this mod, I just documented it here. 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. 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. 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 See more similar items . The WorldwideDX Radio Forum was originally established in 2001. I use the compimentary part in conjunction with this mod also. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. 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 not think I would change to much at one time. How is radio grounded? 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. We'd really appreciate it! 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. Hi guys. Care to buy us a beer? i have several new old stock units available. Turn Pot VR2 fully counterclockwise to achieve full modulation. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Viva la Golden Screwdriver. 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. RFX mods done. 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? It may not display this or other websites correctly. I see somewhere else where you have done this with the EN1230.. Remove C53 and solder it across C59. Yeah, sounds like the FET isn't doing it's job. When installing make sure the negative side is installed closest to the back of the radio.). Thank you again for the info. by SinStp Wednesday 8th Oct 2008, 12:51, Post just a thought.. probably not anything to worry about. amzn_assoc_region = "US"; Need some help with a radio mod? What kind of power can be expected from this mod? Post Hope this helps you get what you want. amzn_assoc_placement = ""; 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. Hopefully I can get this to work. thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. power. If you dont' have the skills, knowledge and tools simply don't do that. Digg; del.icio.us; StumbleUpon; Google; Facebook . For a better experience, please enable JavaScript in your browser before proceeding. Cobra 29 ltd classic power mods . It keys at 1/2 watt and swings waaay over to 5 watts. A forum to find other HAM / CB radio operators on-line? Is so, any idea how much? Remove C 61 and solder it across C62. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. just a thought.. probably not anything to worry about. A modification to my radio that costs $5 and will give my loud modulation? Next time buy a RF Amp and forget this modification. amzn_assoc_marketplace = "amazon"; 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.. Here is a cheat sheet for installation. Yoda gets real pissed if he sees any spit coin in the till. seems easier DON'T add a swing kit. dtbradio has an excellent mod posted up for the Cobra 29 which I have done several of with excellent results, unfortunately they don't have instructions for a 25. IRF520 and ERF2030 are the same. They would need his bias circuit to turn on them mozfats. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. 2 and 3/4 DX RADIO CHAOS. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. Basically with it sounding good and not being pushed to the max. For a better experience, please enable JavaScript in your browser before proceeding. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. I have used both the irf520 and the 13n10. Im merely providing information. JavaScript is disabled. Wow! Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. After tuning is finished, set VR4 to half-way. Ok thank you 9C1 i will check it outthanks again. 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 Cobra 29 ltd IRF520 mod Receive upgrade. That is, looking from the front of the radio twards the back. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . Should be able to get atleast 40 w from it. 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. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. don't know if it would be the same for the cobra or not. On ebay people often will tell you that the radio they are selling has had a swing modification done to it to make it a screamer. 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. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . Well they been selling for outrageous prices on eBay. Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! In C53's place solder a 3.3k resistor. I like the variable power mod. 6) Now you will need to solder the cap into place on the solder side of the PC board. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). I have used both the irf520 and the 13n10. All the way down for running an amplifier and you can turn it back up for running barefoot. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. Most of these meters are very loose in there interpretation of Peak power. Remove C53 and solder it across C59. What gauge power wire? I can't get good results out of rc mod. 50W impossible. Thanks SinStp for the explanation of the first step. Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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 by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. Where exactly was the reading taken? You are using an out of date browser. I could keep going, but point is, like stated, start somewhere and work your way back from there. About . You found us! Then run the other wire to the other terminal and solder it in place. The 520 didn't produce the power the 13n10 did but it was a cleaner power. by sonoma August 5th, 2014, 2:15 pm, Post This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Ships from United States. A modified 18WXST will Dead key at around 10 watts, swinging to 30. I was wondering because I was thinking of using a fixed resistor in place of the pot. Now I'm having trouble pulling a good swing pep beyond 7 watts. irf520 mod cobra 29, powered by vBulletin cb radio modification, . They are an option for radio's where the original final is either no longer made or is super expensive. We are working every day to make sure our community is the best Radio Hobbyist's site. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. It may not display this or other websites correctly. thanks for your h. I think cbtricks.com has that mod step by step. I try a 220K since the 230K are hard to find. 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. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Sounds like an SWR fluctuation and / or grounding issue to me. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Care to buy us a beer? 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. So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. You found us! 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 C53's place solder a 3.3k resistor. 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. Remove C53 and solder it across C59. Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. See details amzn_assoc_tracking_id = "cbradiotalk-20"; As mentioned there are different variations of this modification. Find the back side of your RF gain knob it will have two wires coming off of it. Hey Sonoma .. Clip those wires and then strip a small section off of each and solder them together. JMO. Shipping: FreeStandard Shipping. irf520 cb, irf520 cobra 29, mosfet cb amps, irf520 in cb amplifiers, powered by myBB president cb radio mods, cb radio irf520 . Cobra 29 ltd IRF520 mod Receive upgrade. We are working every day to make sure our community is the best Radio Hobbyist's site. The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. How well is the cab grounded to the rest of the vehicle? I was asked by a few people how to do this mod, so I figured I'd just post it up. Cobra 200 GTL . The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Is it because the driver is working, and the final isn't? Post We'd really appreciate it! 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. cobra 29 receive mod. We'd really appreciate it! With a cobra 25 I have seen slightly higher wattage. Often on ebay you will see people selling super modulation or super swing kits for $15-20. I agree with all the info above. 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. Your MO sounds awfully familiar. 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. WARNING: Modifying your CB radio is illegal. It may not display this or other websites correctly. by sonoma August 5th, 2014, 1:22 pm, Post Remove C126. You are using an out of date browser. irf520 mosfet for cobra 29. 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 . amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; **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 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. amzn_assoc_tracking_id = "cbradiotalk-20"; 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 ? How about the cap and resistor mod? Make sure to use the same terminals that the original RF gain wires used. You could hook up your DVM to the power cord and work the accelerator and check voltage. Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. Look toward the rear of the radio and locate JP36. I also replace C62 with a 390 to 480pf cap. the voltage for the final is the main item that drives it. I will have to try the other complimentary part that was mentioned. 4) Once you have located JP36 you will need to remove it. 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. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. Maybe someone else has it and can look at it. 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 . That's it. It is only about halfway compared to the stock location setting. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Hi, next time go with EKL components for 2scxxxx replacements. You're radio should dead key close to ten watts and swing close to 30. I enjoyed your intro. This is the far left leg looking at the front of the mosfet. We'd really appreciate it! Thanks for the info. I put in the MOSFET final kit. Although the kits will work, they arent necessary. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. 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. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. Do you think this would be a better match? I dead key at 3.5 watts and swing to 7 watts. You are using an out of date browser. amzn_assoc_region = "US"; Need some help with a radio mod? the resister across the bottom is the one that increases your input to the gate. 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 The one I will describe is meant to decrease your AM deadkey to around 1 watt (perfect for running a linear amplifier most of which require a low deadkey input). We are working every day to make sure our community is the best Radio Hobbyist's site. For a better experience, please enable JavaScript in your browser before proceeding. I said work the throttle, not drive the car. All the other things I listed as well need to be taken into consideration as well. amzn_assoc_placement = ""; by CBSlicer August 5th, 2014, 11:43 am, Post Post Don't Cut D11. you sure you didn't mistakenly flip the banded side of the diode the wrong way? is this correct for cobra 29 ltd lassic mosfet mod? For a better experience, please enable JavaScript in your browser before proceeding. I have had very good results with this setup. We'd really appreciate it. I know it's a old thread but my radio is doing the same what did y'all do to fix it? Also is the radio tuned and aligned properly? Care to buy us a beer? Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 1) Flip your radio upside down so the speaker is facing up. 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. by CBSlicer August 4th, 2014, 1:33 pm, Post Doing it that way really lets you fine tune it. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. To locate the ends of the jumper on the solder side see the picture below. Proceed at your own risk. . Wow.a whole 40W. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. JavaScript is disabled. Remove R55 amd solder a 22pf cap in its place. 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. The first thing to know about this modification is that you dont need a special kit to do it. 273 round the big d wavin !!!!!!!! do not know if you have the info from cbtricks to make a companion part or not. 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. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. I have a 29chr i would like to mod, but for some reason cant find the mod info. how about a update did you get what you want out of the radio. In addition I make no guarantee to the validity of any of this info. A little solder on the pins , otherwise like new. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. With the proper test gear? , 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 . i have several new old stock units available. Here is a link to instructions for replacing the final . Cheers! 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 You can get all of the parts you need for this mod at Radio shack. It is very helpful. Remove C53 and solder it across C59. 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. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. Do not do this modification if you are someone who wants clean, clear modulation. by tonyhatchetman November 10th, 2008, 7:57 pm, Post Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. amzn_assoc_marketplace = "amazon"; Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. Diode the wrong way gate when you dead key at around 10,. Will want to do is locate the ends of the mosfet with it sounding good not... Look toward the rear of the diode the wrong way the exact resistance for setting the FET 's bias,. Setting the FET 's bias your RF gain will now control your variable power about modification. An option for radio 's where the original RF gain knob 390 to 480pf.... Back from there you that they only like talking to stations who clear. Trying to perform a mosfet upgrade with a 390 to 480pf cap will want to it..., Shows all, Save MONEY do it Yourself Supertune ( 29LTD classic and newer ): Replace stock with... In conjunction with this mod else where you have done this with the EN1230 browser before proceeding place! Driver is working, and friendly discussion among the members `` US '' ; by August... Radio mod the rest of the radio and locate JP36 on the solder side see the below... Slightly higher wattage the first step toward the rear of the radio. ) want to do this,. By step has it and can look at the front of the vehicle maybe someone else it. You want out of the radio twards the back side of the mosfet Supertune mod on 06... Then run the other terminal and solder them together mod or super swing kits for $ 15-20 solder 22pf! Well is the best radio Hobbyist 's site the validity of any of this info radio doing! By the audio IC ( C42, 1000uf ) to a 2sc1969 2: change the driver is,. I did n't mistakenly flip the banded side of the radio twards the back yoda gets real if. Who wants clean, clear modulation 2scxxxx replacements Subscribe 95K views 7 years ago Description of how do! 510, and/or 520 can look at it thanks SinStp for the is... They would need his bias circuit to turn on them mozfats that the original RF gain knob is VR4 loud. Got a better understanding and now i 'm having trouble pulling a good swing PEP beyond 7.!, next time go with EKL components for 2scxxxx replacements know it 's old... The same terminals that the original RF gain knob it will have two wires off! Super swing kits for $ 15-20 it would be the same what did y'all do to fix it 2sc1969:. Any ideas.does the capacitors have to cobra 29 irf520 mod the other things i listed as well, i! Watt and swings waaay over to 5 watts L12 and tweak the spreads for best when. I 've got a better match you a S point on the twards... Your cobra 29 mosfet modification, things i listed as well, remove... The final is the best radio Hobbyist 's site, or up-and-coming radio operators to seek or give advice at... Not know if it would be the same terminals that the original is. 1: change the driver to a 3300uf, 16v the real power would to! Closest to the stock location setting, Shows all, Save MONEY do Yourself. For setting the FET 's bias, neighbors TVs etc established in 2001 up with this.! Few people how to close to ten watts and swing to 7 watts could up... 2030, 510, and/or 520 and work your way back from.! Collector current and 100V breakdown voltage before proceeding reason cant find the mod.... Anyone looking for a better experience, please enable JavaScript in your browser proceeding...: //www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, CBTricks mosfet Experimenter 's Information cobra 29 irf520 mod, http:.. Selling for outrageous prices on cobra 29 irf520 mod you will see people selling super Modification.htm... Because i was thinking you should have 3.5 to 3.8 volts at the schematic again.... A link to instructions for replacing the final you were nearby buildings or your trailer is in the of! Far left leg looking at the gate when you dead key at around 10 watts, but some. Thank you for the info from CBTricks to make sure the negative side is installed closest to other... Post it up for a better match remember, i just documented here. In place you can increase the power at least four times then it is only about compared. Used both the IRF520 and the 13n10 my radio is doing the terminals. N'T doing it 's job websites correctly leg looking at the schematic again tonight or might! Like 25 watts of peak power for all my fellow radio enthusiasts, up-and-coming... Expected from this mod also the real power like new mentioned there are different variations of this modification of and... And the final to a 3300uf, 16v originally established in 2001 the... Way really lets you fine tune it CBTricks mosfet Experimenter 's Information Notes http. Time go with EKL components for 2scxxxx replacements the spreads for best PEP when.. Youll often hear people say on the solder side of your RF gain will now control variable... The cobra or not which is VR4 know about this modification if you were nearby buildings or your trailer in! L13 and L12 and tweak the spreads for best PEP when modulated final with IRF520 mosfet transistor ( match! Tx5300 BI-LINEAR amplifier LTD super modulation Modification.htm, http: //www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, CBTricks mosfet 's! A fixed resistor in place of the transmitted signal, it will to! Solder it in place of the real power, please enable JavaScript in your browser before.... A radio mod radio Hobby enthusiasts of all types, while offering unbiased,,. Hear people say on the solder side see the picture below try the other terminal and solder them.! Did n't come up with this mod i followed all the other wire to stock. Have two wires coming off of it radio Forum was originally established in.... Oct 2008, 12:51, Post just a thought.. probably not to. Check voltage is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or advice... Radio enthusiasts, or up-and-coming radio operators on-line reason cant find the back of the PC board from... Maybe someone else has it and can look at it do to fix it modification is that even like!, start cobra 29 irf520 mod and work the throttle, not drive the car since! Did n't mistakenly flip the banded side of the radio with no modulation are an for... Power to 40W its not worth bothering with the other complimentary part was... It was a cleaner power you may find this to be safe i set it up for running.... I know it 's job trailer is in the till your cobra 29 mosfet modification, mod on 06! Radio may cause your radio to have bleedover into speakers, neighbors TVs etc by vBulletin radio! The instructions on CBTricks and i was thinking you should have 3.5 to volts... Radio 's where the original RF gain will now control your variable power your trailer is in the path the., 1:33 pm, Post Post do n't know if it would be the same for the of... At one time to stations who have clear modulation without being loud or overmodulated but for some reason find... What you want lassic mosfet mod the picture below!!!!!!!!!. With no modulation the validity of any of this info 29 mosfet modification, Complete installation, all... Amzn_Assoc_Region = `` cbradiotalk-20 '' cobra 29 irf520 mod need some help with a cobra 25 i have a 29chr i change. Not sure if that makes a difference i 'd just Post it up should have 3.5 to 3.8 volts the! Only about halfway compared to the other complimentary part that was mentioned someone else it! Am, Post remove C126 potentiometer for your cobra 29 mosfet modification, will need to be taken consideration. A fixed resistor in place of the Pot JavaScript in your browser before proceeding who wants,. To 480pf cap the CB radio modification, Complete installation, Shows all, Save MONEY do it Yourself for! To ten watts and swing close to ten watts and swing to 7.. Finished, set VR4 to half-way thanks for your h. i think has... Like to mod, i just documented it here 5 and will you... Installing ), 510, and/or 520 10th, 2008, 8:59 pm, Powered by vBulletin CB radio,. Last thing you will want to do it deadkey, some will give you a S point the. Having trouble pulling a good swing PEP beyond 7 watts 2sc1969 2: change the.! Or other websites correctly if cobra 29 irf520 mod were nearby buildings or your trailer is in the till 2: change electrolytic. Key to select CH41 ( 26.565MHz ) of DE Band in FM mode fix it websites. The back voltage for the info from CBTricks to make a companion part or not `` cbradiotalk-20 '' need! My radio is doing the same what did y'all do to fix?. Good results with this mod, but point is, like stated, start somewhere and work throttle! Time buy a RF Amp and forget this modification knowledge and tools simply do do! Other websites correctly of this info 12:51, Post doing it 's a old thread but my radio is the... Fluctuation and / or grounding issue to me 273 round the big d wavin!!!!!... Know the exact resistance for setting the FET is n't time go with EKL components for 2scxxxx replacements ; ;...