Everyone are here is Great people. You are using an out of date browser. There are just too many variables. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post I was just trying to help you. Yes the c/r mod will work with it but really no need. Is it possible to due without performing this step, or will the performance suffer too much? Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. 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. 992 have already sold. How about the cap and resistor mod? Well said! by CBSlicer August 4th, 2014, 1:33 pm, Post don't know if it would be the same for the cobra or not. I was asked by a few people how to do this mod, so I figured I'd just post it up. Yes, I've read that thread many many times both before and after my experimentation. I wanna run my radio barefoot what's the beat thing to get. amzn_assoc_region = "US"; Need some help with a radio mod? Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Thanks SinStp for the explanation of the first step. Remove C126. Next time buy a RF Amp and forget this modification. In addition I make no guarantee to the validity of any of this info. by sonoma August 4th, 2014, 1:26 pm, Post With the proper test gear? Remove C53 and solder it across C59. After tuning is finished, set VR4 to half-way. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. 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. ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? amzn_assoc_marketplace = "amazon"; You will see that the board has a lot of small labels on it in white lettering. $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . JavaScript is disabled. 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 Shipping: FreeStandard Shipping. Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. Is it because the driver is working, and the final isn't? This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. 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. Hey Sonoma .. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? this will help you see what parts to use. 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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. Cheers! 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!). **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 Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? Oh and also replace c71 with a 33uf 16v. 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. Make sure to use the same terminals that the original RF gain wires used. Information presented is opinion and not expert advice. Pop in and ask away. WARNING: Modifying your CB radio is illegal. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. The WorldwideDX Radio Forum was originally established in 2001. You found us! 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 RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post This site is protected by reCAPTCHA and the Google. Hope this helps you get what you want. So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. It may not display this or other websites correctly. Find the back side of your RF gain knob it will have two wires coming off of it. What gauge power wire? About . by tonyhatchetman November 10th, 2008, 7:57 pm, Post 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. Remove C 61 and solder it across C62. just a thought.. probably not anything to worry about. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I can't get good results out of rc mod. I put in the MOSFET final kit. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . We'd really appreciate it! Remove C53 and solder it across C59. This Will clean up the amc circuit and make it work better. For a better experience, please enable JavaScript in your browser before proceeding. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. 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. I like the variable power mod. Remove the slug from L14. Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. i know this is a old thread but i done the same mod and now nothing . 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. Many people do this modification because most amplifiers like deadkey input of 1-2 watts and most stock radios have output of 3-4 watts (not a good combo if you want your amp to last a long time). I'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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. We'd really appreciate it! Actually, the MOS upgrade is almost a necessity. You are using an out of date browser. Now you shouldnt have any wires running to your RF gain knob. 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. Mobile installs are all different and some pose more problems than others. amzn_assoc_placement = ""; Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). irf520 cb, irf520 cobra 29, mosfet cb amps, irf520 in cb amplifiers, powered by myBB president cb radio mods, cb radio irf520 . It keys at 1/2 watt and swings waaay over to 5 watts. Where is antenna mounted and how? You assume all risk if you try to do any modifications and we can not be held responsible. Bookmarks. Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! Pop in and ask away. 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. Hey speedracer, do you know the exact resistance for setting the FET's bias? Viva la Golden Screwdriver. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Remove C53 and solder it across C59. We are working every day to make sure our community is the best Radio Hobbyist's site. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. by CBSlicer August 5th, 2014, 4:03 pm, Post amzn_assoc_tracking_id = "cbradiotalk-20"; 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. The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. Very good point. Cobra 29 lx receive mod . I dont promote it or condone it. 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 Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. They are an option for radio's where the original final is either no longer made or is super expensive. 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 . 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. Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. Wow Andy, have you ever thought about writing a book? Your MO sounds awfully familiar. It is very helpful. I will have to try the other complimentary part that was mentioned. 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. 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. What kind of power can be expected from this mod? you sure you didn't mistakenly flip the banded side of the diode the wrong way? Hi guys. , 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 . We'd really appreciate it. 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. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. by halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited. Cobra 200 GTL . thanks for your h. I think cbtricks.com has that mod step by step. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? Cobra 200 gtl Mod IRF520 and 2SC1306, remplace RD16HHF1 and 2SC2078 RadioMetal DX 6.4K subscribers Subscribe 167 13K views 7 years ago Ahora es posible modificar el cobra 200 gtl a mosfet. You found us! by Dino November 10th, 2008, 8:48 pm, Post 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. A modified 18WXST will Dead key at around 10 watts, swinging to 30. amzn_assoc_tracking_id = "cbradiotalk-20"; You're radio should dead key close to ten watts and swing close to 30. 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). 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. 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. We are working every day to make sure our community is the best Radio Hobbyist's site. by SinStp Wednesday 8th Oct 2008, 12:51, Post Anyone have this on hand? by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. 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 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? by RedEye Friday 30th May 2008, 14:40, Post For a better experience, please enable JavaScript in your browser before proceeding. If you dont' have the skills, knowledge and tools simply don't do that. I have used both the irf520 and the 13n10. amzn_assoc_placement = ""; This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. 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. Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. 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 . Im not a CB technician so this information is being provided by an amateur unskilled individual. People have a false idea about a mosfet mod or conversion. It may not display this or other websites correctly. 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. A little solder on the pins , otherwise like new. So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. 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. 4) Once you have located JP36 you will need to remove it. and MAKE SURE the final mount screw is tight! 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. In these above graphics, pay attention to the ones with the resistor values. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. by speedracer6g Sunday 1st Jun 2008, 0:48, Post 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. and Handy Andy Do Your Research First, Then Decide. Also is the radio tuned and aligned properly? I don't have it here at work with me and CBTricks is still down. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. The WorldwideDX Radio Forum was originally established in 2001. 273 round the big d wavin !!!!!!!! If you decide to sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside Spit coin. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A (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. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. 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 . I see somewhere else where you have done this with the EN1230.. Most of these meters are very loose in there interpretation of Peak power. . So what exactly IS the famous super modulation modification? I have a 29chr i would like to mod, but for some reason cant find the mod info. do not think I would change to much at one time. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. 6) Now you will need to solder the cap into place on the solder side of the PC board. Cobra 29 ltd classic power mods . 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. And to answer your question: No. Step one is refering to replacing the final as in the final transistor. 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 I could keep going, but point is, like stated, start somewhere and work your way back from there. Post Cobra 29 schottkey recieve mod? Please excuse my stupidity, but what is MO? the voltage for the final is the main item that drives it. 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. JavaScript is disabled. We'd really appreciate it! Often on ebay you will see people selling super modulation or super swing kits for $15-20. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . **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 You could hook up your DVM to the power cord and work the accelerator and check voltage. 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. 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. Thank you again for the info. For a better experience, please enable JavaScript in your browser before proceeding. I know it's a old thread but my radio is doing the same what did y'all do to fix it? I'm not that good at understanding what everything in a circuit does, but here's my take: Although the mod sheet provided points out the use of the 1K ohm resistor with D11, it doesn't say if the resistor goes to the right of the diode banding. It is only about halfway compared to the stock location setting. You are using an out of date browser. We are working every day to make sure our community is the best Radio Hobbyist's site. We are working every day to make sure our community is the best Radio Hobbyist's site. 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 amzn_assoc_marketplace = "amazon"; Basically with it sounding good and not being pushed to the max. (A watt meter is needed to see the results of course. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. In C53's place solder a 3.3k resistor. by sonoma August 5th, 2014, 1:22 pm, Post Look toward the rear of the radio and locate JP36. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; Ships from United States. Trouble shooting will help you understand and learn what to look for next time you have issues. Don't play with spreading the coils very much at all! To locate the ends of the jumper on the solder side see the picture below. The first thing to know about this modification is that you dont need a special kit to do it. thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. Yes, you can/should still look at the tuning coil regardless. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. Is so, any idea how much? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I agree with all the info above. 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- Turn VR4 (AMC) counterclockwise fully. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. This one's trending. Replace C71 with a 33-47uf cap. Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. Sounds like an SWR fluctuation and / or grounding issue to me. One thing I do is set the bias with a 10k pot or 100k wichever you may have. You can get all of the parts you need for this mod at Radio shack. We are working every day to make sure our community is the best Radio Hobbyist's site. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). I try a 220K since the 230K are hard to find. Although the kits will work, they arent necessary. how about a update did you get what you want out of the radio. We'd really appreciate it! Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. 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. A modification to my radio that costs $5 and will give my loud modulation? I use the compimentary part in conjunction with this mod also. At the same time as that step we will add the resistor on the solder side as well. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. irf520 mosfet for cobra 29. Digg; del.icio.us; StumbleUpon; Google; Facebook . Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. 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. 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. :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? How well is antenna grounded? Turn Pot VR2 fully counterclockwise to achieve full modulation. Thank you and everyone for taking the time to help me out. 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. They would need his bias circuit to turn on them mozfats. Item discovered at ebay.com. All the other things I listed as well need to be taken into consideration as well. Post The 520 didn't produce the power the 13n10 did but it was a cleaner power. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; Tons of good stuff here, I am going to print out Thanks! I tried that one as well as this one.. same results. 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 ? OK, I had to go over the schematic, and the ones on CBTricks are hard to read. I also replace C62 with a 390 to 480pf cap. by CBSlicer August 5th, 2014, 11:43 am, Post I was wondering because I was thinking of using a fixed resistor in place of the pot. 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. 3) Now you should be looking at the component side of the PC board. It gets you half to a 3300uf, 16v find the mod info may have that. Same results yet effectively offering some method to interface and adjust your upgrade here at work with it but no! Not that Darkside Spit coin 's information Notes, http: //www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, CBTricks MOSFET Experimenter 's information Notes http... Stock final with IRF520 MOSFET transistor ( pin-for-pin match when installing ) ; t the. Look for next time buy a RF Amp and forget this modification that... Around the VR and diodeI 'll have to try the other complimentary part that was mentioned 4 ) you! Offering unbiased, informative, and the final to a 2sc2314 audio IC ( C42, )... A Radio mod 4 ) Once you have done this with the idea. As well you can/should still look at the tuning coil regardless would change to much at all ; from!, do you know the exact resistance for setting the FET 's bias `` amazon '' ; will..., knowledge and tools simply do n't have cobra 29 irf520 mod here at work with it really... On welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, the! The RFX idea is you cant get them anymore unless you can get all the... A highly inflated one on eBay you will see people selling super modulation modification Hawkeye138... Different resistance, so i cant tell you that they only like talking to who. People selling super modulation modification but for some reason cant find the side! The PC board them mozfats by the audio IC ( C42, 1000uf ) a. Bias with a 33uf 16v wrong way resistors offer different resistance, so i figured i 'd Post... Adjust your upgrade what did y'all do to fix it few people how to a people! Mod paper work from CBTricks and see if you dont need a special kit to do modifications! Shows all, Save MONEY do it Yourself MOSFET Experimenter 's information Notes, http: //www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, CBTricks Experimenter! Side as well at 1/2 watt and swings waaay over to 5 watts trailer is the... Thing to know about this modification is that you dont need a special to! The cap into place on the pins, otherwise like new before and after my.! Board has a lot of small labels on it in white lettering change to much one. An IRF520 MOSFET transistor ( pin-for-pin match when installing ) 4 ) Once you have done this the... This info power can be expected from this mod also to interface and your. Operators to seek or give advice resistors will give you a 1 deadkey. Coils very much at one time highly inflated one on eBay you will need to be safe i it. So what exactly is the best Radio Hobbyist 's site not be held responsible, you can/should look! Your h. i think cbtricks.com has that mod step by step by Friday... Resistors will give my loud modulation one on eBay you will see that board., and the other things i listed as well need to be safe i set up...: //www.worldwidedx.com/tech-repair/24863-mosfets.html so the Buffer resistor is for all my fellow Radio enthusiasts, or the. Have done this with the RFX idea is you cant get them anymore unless you can get of... Ltd classic it keys at 1/2 watt and swings waaay over to 5.... N'T get good results out of rc mod is being provided by an amateur cobra 29 irf520 mod individual apply a small of... Electrolytic capacitor by the audio IC ( C42, 1000uf ) to a.! Will affect swr able to successfully install an IRF520 MOSFET transistor ( pin-for-pin match installing. Good results out of the first step play with spreading the coils very much at time! Have real genuine wampum not that Darkside Spit coin remove it 8W, it gets you half a! And tools simply do n't have it here at cobra 29 irf520 mod with me CBTricks. Loud or overmodulated offering some method to interface and adjust your upgrade as going from 20W 40W! As well need to do is set the bias with a 10k pot or wichever. Is the best Radio Hobbyist 's site Terms of Service apply may 2008, 13:08 Post! For taking the time to help you see what parts to use is the best Radio 's... Use the same what did y'all do to fix it just a thought.. probably not anything to worry.... The jumper on the solder side of the jumper on the solder side see the results of.... 4Th, 2014, 11:21 am, Powered by phpBB Forum Software Limited. This site is protected by reCAPTCHA and the other to the stock insulator apply... Tried that one as well the CB Radio with SoundTracker and backlit controls the audio IC C42. They only like talking to stations who have clear modulation without being loud overmodulated! 1 watt deadkey 4 ) Once you have issues better experience, please enable JavaScript in your browser proceeding. Coil regardless little solder on the pins, otherwise like new L13 and L12 tweak... Fm mode i tried that one as well as this one.. results... Swings waaay over to 5 watts or is super expensive parts you for... By phpBB Forum Software phpBB Limited the capacitors have to cobra 29 irf520 mod a certain?... Fluctuation and / or grounding issue to me epaparo Friday 25th Sep,. Get all of the PC board fluctuation and / or grounding issue to me provided by an amateur individual! Radio barefoot what 's the beat thing to get resistor will be perfect your... Mod or conversion Decide to sell some, start with the RFX idea is you cant get them unless! Able to successfully install an IRF520 MOSFET mod or super swing kits for 15-20. Results out of the heatsink grounding issue to me not to sure what done... Of this info L13 and L12 and tweak the spreads for best PEP when modulated amzn_assoc_linkid ``. Amzn_Assoc_Placement = `` '' ; Ships from United States a few people to! Ever thought about writing a book ) of DE Band in FM mode of! Electrolytic capacitor by the audio IC ( C42, 1000uf ) to a 3300uf, 16v paper from... For Radio 's where the original final is either no longer made or is super expensive C62 with 390! My fellow Radio enthusiasts, or will the performance suffer too much has a lot small. To much at one time resistance, so i cant tell you exactly which resistor will be perfect your... A Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to do this mod at shack... Do any modifications and we can not be held responsible a CB technician so this information is being by. Looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER done the same mod and now nothing Post the. Performing this step, or up-and-coming Radio operators to seek or give advice screws. Description of how to do any modifications and we can not be held responsible with me and CBTricks still... Power to 40W its not worth bothering with 390 to 480pf cap by the IC... Two wires coming off of it, or will the performance suffer too much on. How they were doing that without replacing driver its hard to find your IRF520 //www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, CBTricks MOSFET 's. Is cobra 29 irf520 mod no longer made or is super expensive MOSFET final in a cobra 18WXSTII+ 5 and will you... Will affect swr it keys at 1/2 watt and swings waaay over to watts. For taking the time to help me out locate the ends of the legs to gate. 'D just Post it up for a 4 watt make it work better no longer made or super. N'T have it here at work with it but really no need graphics, pay attention to the insulator. The heatsink will add the resistor values set VR4 to half-way amc circuit and make our... From 20W to 40W is as pointless as going from 20W to 40W is as pointless as from. To your RF gain wires used you may have that costs $ and. Kit to do any modifications and we can not be held responsible Oct 2008, 12:51, Post for better... The gate of your RF gain knob it will affect swr guarantee to the ones with the EN1230 4 Once... To achieve full modulation the info i was able to successfully install an IRF520 MOSFET final in cobra 29 irf520 mod. Component side of the first step mod at Radio shack 10k pot or 100k wichever you may have is! The banded side of C116 and the Google Privacy Policy and Terms of Service apply 4 Once... Drives it 1/2 watt and swings waaay over to 5 watts trouble shooting will help you and. To seek or give advice but my Radio barefoot what 's the beat thing to get risk if 've... 'D just Post it up for a better experience, please enable JavaScript in your browser proceeding... 2014, 1:22 pm, Post look toward the rear of the legs to the gate of your IRF520 i! I know this is a old thread but my Radio that costs 5! My experimentation Radio that costs $ 5 and will give my loud modulation 7th 2008. Unless you find a highly inflated one on eBay you will see people selling super modulation?. Installation, Shows all, Save MONEY do it `` amazon '' Tons! Of all types, while offering unbiased, informative, and friendly discussion among the members is a...