cobra 29 irf520 modcobra 29 irf520 mod

I will have to try the other complimentary part that was mentioned. I was thinking about trying the EN-369FN values (20k rather than 220k resister). seems easier DON'T add a swing kit. Actually, the MOS upgrade is almost a necessity. I was wondering because I was thinking of using a fixed resistor in place of the pot. 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- I was just trying to help you. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. , 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 . RFX mods done. by speedracer6g Sunday 1st Jun 2008, 0:48, Post What gauge power wire? amzn_assoc_ad_type = "link_enhancement_widget"; We are working every day to make sure our community is the best Radio Hobbyist's site. Install the IRF520 Mosfet at Q25. 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. Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! When installing make sure the negative side is installed closest to the back of the radio.). . I also replace C62 with a 390 to 480pf cap. About . by sonoma August 5th, 2014, 1:22 pm, Post Remove C 61 and solder it across C62. by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. Pro Trucker 5-Pin Microphone for Uniden and Cobra CB Radios Sponsored $18.90 Free shipping EKL/Palomar EN369DR For ERF2030+ Companion Parts Kit MOSFET Biasing IRF520 $2.99 + $4.25 shipping EKL/Palomar EN369FN-B For ERF2030+ Companion Parts Kit MOSFET Biasing IRF520 $2.99 + $4.25 shipping Use the link I gave you to that other thread and check everything out with a multimeter along the way. Remove C53 and solder it across C59. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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? Remove C53 and solder it across C59. 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? Thank you again for the info. 3) Now you should be looking at the component side of the PC board. We are working every day to make sure our community is the best Radio Hobbyist's site. Sounds like an SWR fluctuation and / or grounding issue to me. 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 Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. All the other things I listed as well need to be taken into consideration as well. 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. by RadioEndeavor Monday 13th Oct 2008, 14:16, Post take a look at the mosfet mod paper work from cbtricks and see if you missed a step. What kind of power can be expected from this mod? 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. Welcome to the forum. A modified 18WXST will Dead key at around 10 watts, swinging to 30. Remove the slug from L14. For a better experience, please enable JavaScript in your browser before proceeding. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Pop in and ask away. its a new 2012 cobra not sure if that makes a difference. JavaScript is disabled. 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. 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. We'd really appreciate it! It may not display this or other websites correctly. amzn_assoc_tracking_id = "cbradiotalk-20"; 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. I have used both the irf520 and the 13n10. In addition I make no guarantee to the validity of any of this info. JavaScript is disabled. Find the back side of your RF gain knob it will have two wires coming off of it. You are using an out of date browser. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? It may not display this or other websites correctly. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Information presented is opinion and not expert advice. 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. 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. 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive 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. For a better experience, please enable JavaScript in your browser before proceeding. For a better experience, please enable JavaScript in your browser before proceeding. Here is a cheat sheet for installation. 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. 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). Hi, next time go with EKL components for 2scxxxx replacements. amzn_assoc_tracking_id = "cbradiotalk-20"; I don't have it here at work with me and CBTricks is still down. by Hawkeye138 Saturday 31st May 2008, 0:11, Post So what exactly IS the famous super modulation modification? I have used both the irf520 and the 13n10. See more similar items . no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? Replace C71 with a 33-47uf cap. You're radio should dead key close to ten watts and swing close to 30. 1) Flip your radio upside down so the speaker is facing up. The WorldwideDX Radio Forum was originally established in 2001. Remove C126. Bookmarks. i know this is a old thread but i done the same mod and now nothing . 273 round the big d wavin !!!!!!!! by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. I wanna run my radio barefoot what's the beat thing to get. Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. 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. We'd really appreciate it. Im not a CB technician so this information is being provided by an amateur unskilled individual. 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. Yoda gets real pissed if he sees any spit coin in the till. ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? 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. i have several new old stock units available. hatchet told you that !!!!! by Dino November 10th, 2008, 7:49 pm, Post We'd really appreciate it! Maybe someone else has it and can look at it. Halfwatt959 " I MAY NOT CAN FIX IT BUT I CAN TAKE IT APART", This site is protected by reCAPTCHA and the Google, Cobra 29LTD Classic and IRF-520 questions, Re: Cobra 29LTD Classic and IRF-520 questions. amzn_assoc_marketplace = "amazon"; The WorldwideDX Radio Forum was originally established in 2001. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. amzn_assoc_ad_type = "link_enhancement_widget"; It may not display this or other websites correctly. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. work with the mosfet? In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. amzn_assoc_placement = ""; 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY just a thought.. probably not anything to worry about. The EN2030. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. Look toward the rear of the radio and locate JP36. by CBSlicer August 4th, 2014, 1:33 pm, Post 8) Some people recommend adjusting L14 for maximum power, but in most cases after doing the modification your swing should be better than before and your radio much louder so trying to squeeze a couple of extra watts is not my recommendation. You could hook up your DVM to the power cord and work the accelerator and check voltage. 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. Post I was asked by a few people how to do this mod, so I figured I'd just post it up. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. steady "aaaaah" sound into the mic. I just started to post on forums about a month or so ago. cobra 29 receive mod. 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. Yes, you can/should still look at the tuning coil regardless. 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. i have several new old stock units available. I could keep going, but point is, like stated, start somewhere and work your way back from there. Did you post on this forum as "DualAntennas" " in the last year? 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. Cobra 29 ltd IRF520 mod Receive upgrade. **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 Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. The first thing to know about this modification is that you dont need a special kit to do it. 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. Is it possible to due without performing this step, or will the performance suffer too much? Wow.a whole 40W. This site is protected by reCAPTCHA and the Google. 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. Do you think this would be a better match? This is the far left leg looking at the front of the mosfet. You found us! The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. Cobra 200 GTL . It may not display this or other websites correctly. I tried that one as well as this one.. same results. 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. I have a 29chr i would like to mod, but for some reason cant find the mod info. Spread coil L16 slightly to increase dead key. Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Is so, any idea how much? 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 Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. I said work the throttle, not drive the car. Yep. amzn_assoc_region = "US"; Need some help with a radio mod? Why not just get a linear and use that? by Shadow Friday 28th Aug 2009, 20:30, Post Step one is refering to replacing the final as in the final transistor. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Do not do this modification if you are someone who wants clean, clear modulation. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. 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. by CBSlicer August 4th, 2014, 12:52 pm, Post I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. Doing it that way really lets you fine tune it. by CBSlicer August 5th, 2014, 11:43 am, Post If you dont' have the skills, knowledge and tools simply don't do that. As mentioned there are different variations of this modification. Oh and also replace c71 with a 33uf 16v. For a better experience, please enable JavaScript in your browser before proceeding. If you decide to sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside Spit coin. by CBSlicer August 5th, 2014, 4:03 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. Very good point. Yeah, sounds like the FET isn't doing it's job. cap. Hi guys. JavaScript is disabled. There is a way to do this and add variable power to your Cobra 29. WARNING: Modifying your CB radio is illegal. Make sure to use the same terminals that the original RF gain wires used. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . 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 use the compimentary part in conjunction with this mod also. In C53's place solder a 3.3k resistor. 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). http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. Viva la Golden Screwdriver. Sounds like an SWR fluctuation and / or grounding issue to me. Then run the other wire to the other terminal and solder it in place. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. Proceed at your own risk. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. A modification to my radio that costs $5 and will give my loud modulation? The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. A forum to find other HAM / CB radio operators on-line? Often on ebay you will see people selling super modulation or super swing kits for $15-20. Please excuse my stupidity, but what is MO? :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Once done your RF gain will now control your variable power. 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. Cobra 29 type Meter w/white light from Workman. How is radio grounded? IRF520 and ERF2030 are the same. Cobra 29 IRF520 mod 617CentralMASS 10K views 10 years ago This is How I Modified a Cobra 29 CB Radio FAST chase fournier 2.4K views 4 months ago COBRA 29 MOSFET CONVERSION: CB Radio How. A forum to find other HAM / CB radio operators on-line? don't know if it would be the same for the cobra or not. irf520 mosfet for cobra 29. We are working every day to make sure our community is the best Radio Hobbyist's site. 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 Care to buy us a beer? You will see that the board has a lot of small labels on it in white lettering. Remove C53 and solder it across C59. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; 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). by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. We'd really appreciate it! Is it possible to due without performing this step, or will the performance suffer too much? So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. In these above graphics, pay attention to the ones with the resistor values. Hopefully I can get this to work. and Handy Andy Do Your Research First, Then Decide. Care to buy us a beer? Remove C53 and solder it across C59. 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. Remove C53 and solder it across C59. Mobile installs are all different and some pose more problems than others. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I enjoyed your intro. There are just too many variables. 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? You are using an out of date browser. 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 Digg; del.icio.us; StumbleUpon; Google; Facebook . Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. 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. They would need his bias circuit to turn on them mozfats. by sonoma August 4th, 2014, 4:41 pm, Post Post Most of these meters are very loose in there interpretation of Peak power. I agree with all the info above. Although the kits will work, they arent necessary. We'd really appreciate it! 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 think I would change to much at one time. 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. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. That is, looking from the front of the radio twards the back. You can get all of the parts you need for this mod at Radio shack. 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. 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.). We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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.. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Cobra 29 ltd IRF520 mod Receive upgrade. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. Now I'm having trouble pulling a good swing pep beyond 7 watts. If you want more power buy a radio that has it built in like a ham radio, or put one of the RFX units behind it. JavaScript is disabled. Where exactly was the reading taken? It is only about halfway compared to the stock location setting. Should I just go with the 1969? by tonyhatchetman November 10th, 2008, 7:57 pm, Post by RedEye Friday 30th May 2008, 14:40, Post I dont promote it or condone it. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. With a cobra 25 I have seen slightly higher wattage. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. 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. 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. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . Note: These radios are superb for clarity of modulation, even on the stock mic. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Tons of good stuff here, I am going to print out Thanks! Cobra 29 lx receive mod . I like the variable power mod. The WorldwideDX Radio Forum was originally established in 2001. I dead key at 3.5 watts and swing to 7 watts. See details Thank you and everyone for taking the time to help me out. How well is antenna grounded? Hey Sonoma .. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Now you shouldnt have any wires running to your RF gain knob. The WorldwideDX Radio Forum was originally established in 2001. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. amzn_assoc_placement = ""; I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. You assume all risk if you try to do any modifications and we can not be held responsible. amzn_assoc_marketplace = "amazon"; A little solder on the pins , otherwise like new. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. I see somewhere else where you have done this with the EN1230.. 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.

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