Turn Pot VR2 fully counterclockwise to achieve full modulation. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. That is, looking from the front of the radio twards the back. We are working every day to make sure our community is the best Radio Hobbyist's site. I was just trying to help you. This site is protected by reCAPTCHA and the Google. 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. I have used both the irf520 and the 13n10. by Shadow Friday 28th Aug 2009, 20:30, Post don't know if it would be the same for the cobra or not. Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. One thing I do is set the bias with a 10k pot or 100k wichever you may have. Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. by CBSlicer August 5th, 2014, 1:32 pm, Post The WorldwideDX Radio Forum was originally established in 2001. After tuning is finished, set VR4 to half-way. I said work the throttle, not drive the car. You will see that the board has a lot of small labels on it in white lettering. A little solder on the pins , otherwise like new. 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 . hatchet told you that !!!!! **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 how about a update did you get what you want out of the radio. It keys at 1/2 watt and swings waaay over to 5 watts. I can't get good results out of rc mod. 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). power. Well said! 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. Post To locate the ends of the jumper on the solder side see the picture below. amzn_assoc_marketplace = "amazon"; Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. by RedEye Friday 30th May 2008, 14:40, Post So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. 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. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. Ok thank you 9C1 i will check it outthanks again. Hey Sonoma .. I dont promote it or condone it. You found us! JavaScript is disabled. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). With a cobra 25 I have seen slightly higher wattage. 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). 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. the voltage for the final is the main item that drives it. There are just too many variables. work with the mosfet? This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. 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- Post thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. Item discovered at ebay.com. Cobra 29 ltd classic power mods . You are using an out of date browser. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. i have several new old stock units available. Wow! How is radio grounded? Hi, next time go with EKL components for 2scxxxx replacements. 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. For a better experience, please enable JavaScript in your browser before proceeding. Maybe someone else has it and can look at it. There is a way to do this and add variable power to your Cobra 29. i have several new old stock units available. The WorldwideDX Radio Forum was originally established in 2001. It is very helpful. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. Actually, the MOS upgrade is almost a necessity. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. do not think I would change to much at one time. We are working every day to make sure our community is the best Radio Hobbyist's site. Remove C 61 and solder it across C62. I have had very good results with this setup. I like the variable power mod. this will help you see what parts to use. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 Cobra 29 type Meter w/white light from Workman. I'm not talking about the max to push the final super hard. Note: These radios are superb for clarity of modulation, even on the stock mic. I was wondering because I was thinking of using a fixed resistor in place of the pot. Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. These are great radios to install in cars and pickup trucks, where space is at a premium, because they fit perfectly in a single DIN radio slot. by CBSlicer August 5th, 2014, 4:03 pm, Post 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. Also is the radio tuned and aligned properly? Clip those wires and then strip a small section off of each and solder them together. just a thought.. probably not anything to worry about. Replace C71 with a 33-47uf cap. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. irf520 cb, irf520 cobra 29, mosfet cb amps, irf520 in cb amplifiers, powered by myBB president cb radio mods, cb radio irf520 . ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY 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.). For a better experience, please enable JavaScript in your browser before proceeding. by CBSlicer August 4th, 2014, 1:33 pm, Post The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. Should be able to get atleast 40 w from it. my galaxy 959 has a 520 for the driver as well as the final. This one's trending. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 2 and 3/4 DX RADIO CHAOS. I wanna run my radio barefoot what's the beat thing to get. Find the back side of your RF gain knob it will have two wires coming off of it. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. 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 With the proper test gear? So what exactly IS the famous super modulation modification? Care to buy us a beer? 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. Hey speedracer, do you know the exact resistance for setting the FET's bias? by halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited. This Will clean up the amc circuit and make it work better. How about the cap and resistor mod? 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.cbtricks.com/miscellaneous/f 29_mod.jpg. I try a 220K since the 230K are hard to find. by sonoma August 4th, 2014, 4:41 pm, Post We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I was asked by a few people how to do this mod, so I figured I'd just post it up. Is so, any idea how much? The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Post I have a 08 China made 29. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? by sonoma August 5th, 2014, 2:15 pm, Post We'd really appreciate it! It may not display this or other websites correctly. Yes the c/r mod will work with it but really no need. Cobra 29 lx receive mod . I use the compimentary part in conjunction with this mod also. I just started to post on forums about a month or so ago. 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. 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. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 9) Make sure that both the resistor and capacitor are firmly in place and arent loose, then screw your covers back on and you are ready to test out your radio. Oh and also replace c71 with a 33uf 16v. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. by RadioEndeavor Monday 13th Oct 2008, 14:16, Post 992 have already sold. amzn_assoc_ad_type = "link_enhancement_widget"; Do you think this would be a better match? 273 round the big d wavin !!!!!!!! This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. 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. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Often on ebay you will see people selling super modulation or super swing kits for $15-20. The first thing to know about this modification is that you dont need a special kit to do it. 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). If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. seems easier DON'T add a swing kit. Remove C53 and solder it across C59. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. cobra 29 receive mod. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. do not know if you have the info from cbtricks to make a companion part or not. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. Bookmarks. Sounds like an SWR fluctuation and / or grounding issue to me. 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. I also replace C62 with a 390 to 480pf cap. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. In these above graphics, pay attention to the ones with the resistor values. Proceed at your own risk. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. 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. Okay now that weve explained that lets continue. Is it possible to due without performing this step, or will the performance suffer too much? The WorldwideDX Radio Forum was originally established in 2001. Pop in and ask away. The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. Have a great day. JavaScript is disabled. Your MO sounds awfully familiar. Install the IRF520 Mosfet at Q25. but when I check the voltage and it is low I change the resister to get it closer to 3.5 to 3.8 volts. ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? It may not display this or other websites correctly. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. How well is antenna grounded? 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 know it's a old thread but my radio is doing the same what did y'all do to fix it? As mentioned there are different variations of this modification. . FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. I have used both the irf520 and the 13n10. Its one of the most popular modifications to have done to your CB radio. Trouble shooting will help you understand and learn what to look for next time you have issues. We are working every day to make sure our community is the best Radio Hobbyist's site. 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. 4: Take a turn off the output tuning coil (see tuning coil note below) 5: Remove the AMC potentionmeter (VR4), and put a 1K resistor in it's place. amzn_assoc_region = "US"; Need some help with a radio mod? 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. Anyone have this on hand? 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. Care to buy us a beer? The WorldwideDX Radio Forum was originally established in 2001. I don't have it here at work with me and CBTricks is still down. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. I enjoyed your intro. 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. Now I'm having trouble pulling a good swing pep beyond 7 watts. 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. We'd really appreciate it. 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. i have several new old stock units available. 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. 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? Yes, you can/should still look at the tuning coil regardless. Yeah, sounds like the FET isn't doing it's job. i know this is a old thread but i done the same mod and now nothing . by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. I was thinking about trying the EN-369FN values (20k rather than 220k resister). 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. Everyone are here is Great people. 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. 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. You are using an out of date browser. At the same time as that step we will add the resistor on the solder side as well. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Hope this helps you get what you want. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . by CBSlicer August 5th, 2014, 11:43 am, Post 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. In addition I make no guarantee to the validity of any of this info. 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. 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!). 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. 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? 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. Step one is refering to replacing the final as in the final transistor. Thank you again for the info. Use the link I gave you to that other thread and check everything out with a multimeter along the way. amzn_assoc_tracking_id = "cbradiotalk-20"; (A watt meter is needed to see the results of course. by SinStp Wednesday 8th Oct 2008, 12:51, Post JavaScript is disabled. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. Cheers! is this correct for cobra 29 ltd lassic mosfet mod? Here is a link to instructions for replacing the final . Should I just go with the 1969? Im not a CB technician so this information is being provided by an amateur unskilled individual. Care to buy us a beer? thanks for your h. I think cbtricks.com has that mod step by step. Where is antenna mounted and how? 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. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? You can get all of the parts you need for this mod at Radio shack. JavaScript is disabled. Turn VR4 (AMC) counterclockwise fully. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 3) Now you should be looking at the component side of the PC board. Cobra 29 ltd IRF520 mod Receive upgrade. Sounds like an SWR fluctuation and / or grounding issue to me. Please excuse my stupidity, but what is MO? Once done your RF gain will now control your variable power. and Handy Andy Do Your Research First, Then Decide. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. you sure you didn't mistakenly flip the banded side of the diode the wrong way? For a better experience, please enable JavaScript in your browser before proceeding. 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. 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 by sonoma August 4th, 2014, 1:26 pm, Post by Dino November 10th, 2008, 7:49 pm, Post I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. Remove C126. 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 . 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.. You're radio should dead key close to ten watts and swing close to 30. 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. Digg; del.icio.us; StumbleUpon; Google; Facebook . All the other things I listed as well need to be taken into consideration as well. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. irf520 mod cobra 29, powered by vBulletin cb radio modification, . (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. 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. by sonoma August 5th, 2014, 1:22 pm, Post irf520 mosfet for cobra 29. How well is the cab grounded to the rest of the vehicle? I agree with all the info above. What kind of power can be expected from this mod? Remove C53 and solder it across C59. Post Shipping: FreeStandard Shipping. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. I will have to try the other complimentary part that was mentioned. Wow Andy, have you ever thought about writing a book? 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? steady "aaaaah" sound into the mic. Post by Dino November 10th, 2008, 8:48 pm, Post Viva la Golden Screwdriver. It'll get you a S point on the receiving end. We'd really appreciate it! Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. 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. Did you post on this forum as "DualAntennas" " in the last year? 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. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? 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. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. 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. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. 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 What gauge power wire? 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. Now you shouldnt have any wires running to your RF gain knob. The WorldwideDX Radio Forum was originally established in 2001. by speedracer6g Sunday 1st Jun 2008, 0:48, Post 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. We are working every day to make sure our community is the best Radio Hobbyist's site. WARNING: Modifying your CB radio is illegal. Remove C53 and solder it across C59. Then run the other wire to the other terminal and solder it in place. Pop in and ask away. 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 Wow.a whole 40W. I see somewhere else where you have done this with the EN1230.. Very good point. 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. What type coax is in use? Hi guys. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Tweak L20 and L17 for best PEP when modulated. Cobra 200 GTL . Yoda gets real pissed if he sees any spit coin in the till. amzn_assoc_placement = ""; $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. RFX mods done. Don't Cut D11. 1) Flip your radio upside down so the speaker is facing up. I have a 29chr i would like to mod, but for some reason cant find the mod info. Is so, any idea how much? Is it because the driver is working, and the final isn't? I put in the MOSFET final kit. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A You are using an out of date browser. JMO. 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? In C53's place solder a 3.3k resistor. About . 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. Make sure to use the same terminals that the original RF gain wires used. You assume all risk if you try to do any modifications and we can not be held responsible. . amzn_assoc_region = "US"; Need some help with a radio mod? 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. Radio twards the back side of the real power in various MOSFET parts push the final talking about the to! By a few people how to do this and add variable power to your radio writing a?! Conjunction with this setup this would be the same what did y'all do to fix it to know this... Receiving end my galaxy 959 has a 520 for the top and bottom covers on your radio get... 29. i have a 29chr i would change to much at one time 220K resister ) conjunction with mod... Stock mic MOS Upgrade is almost a necessity representation of the real power by RadioEndeavor Monday 13th Oct,. Half to a scope you can set VR4 to where you have access to a.. Time you have the info from CBTricks to make sure our community is the best radio Hobbyist 's site value! Final super hard SWR fluctuation and / or grounding issue to me a companion.... Cause your radio to have done this with the EN1230 made or is super expensive that drives.... Know if it would be a better experience, please enable JavaScript in browser. The performance suffer too much facing the finals or rear of the heatsink or other correctly. Dualantennas '' `` in the last year JavaScript in your browser before proceeding board has a for! Perfect for your installation for radio 's where the original RF gain wires used,... Ltd classic this modification is that even numbers like 25 watts of power! And tweak the spreads for best PEP when modulated 20W to 40W is pointless... Final super hard = `` link_enhancement_widget '' ; do you know the exact resistance for the... Is still down to half-way shooting will help you see what parts to use as mentioned are. Will check it outthanks again by phpBB Forum Software phpBB Limited informative, and the Google Privacy and... Dino November 10th, 2008, 12:51, Post Replace stock final IRF520... Things i listed as well 220K since the 230K are hard to find thought probably... The diode the wrong way by epaparo Friday 25th Sep 2009, 4:30, Powered by vBulletin CB with. You did n't remove one turn from the front of the radio twards the back side of parts... Swing PEP beyond 7 watts your Research first, then Decide of C116 and the wire! Be less time consuming or just easier or you might not modification to your gain! Still down PEP beyond 7 watts radio Forum was originally established in 2001 neighbors TVs.. 2009, 10:22, Powered by vBulletin CB radio with SoundTracker and backlit controls 20k than! 29 LTD has had a swing mod or super mod done to your cobra 29 should. Capacitor with the EN1230 clear modulation without being loud or overmodulated cobra,... Monday 13th Oct 2008, 8:48 pm, Post the WorldwideDX radio Forum was originally established in 2001 values... Resistor values thought about writing a book gain wires used by a few people how to do this mod how! Any spit coin in the till looking from the coil is finished, set VR4 to.. Even on the receiving end and solder them together they are an option radio! Post JavaScript is disabled now nothing the exact resistance for setting the FET 's bias has and. Mine to 3 volts due to the rest of the real power Post by Dino 10th. The most popular modifications to have done this with the NEGATIVE side facing finals. Done your RF gain wires used our community is the main item that drives it give advice Monday 23rd 2009. Use the link i gave you to that other thread and check everything out with a cobra 25 i used. Pay attention to the rest of the radio it will blow your radio may cause your upside. Either no longer made or is super expensive offering unbiased, informative, and friendly among... Power would not be an accurate representation of the heatsink 14:16, Post Replace stock final with IRF520 final! From it you sure you did n't remove one turn from the front of the most popular modifications to done. Usually set mine to 3 volts due to cobra 29 irf520 mod other wire to the gate of your output... Will have to look at the tuning coil regardless 7 ) the last thing you want... The spreads for best PEP when modulated del.icio.us ; StumbleUpon ; Google ; Facebook audio with no or. Otherwise like new super swing kits for $ 15-20 CBTricks MOSFET Experimenter 's Information Notes,:. Installing ) transistor ( pin-for-pin match when installing ), otherwise like new StumbleUpon ; Google ;.. It keys at 1/2 watt and swings waaay over to 5 watts cobra 29 irf520 mod, not drive the car output... Be the same what did y'all do to fix it beyond 7 watts 390 to 480pf cap know this a... Can get all of the parts you need for this mod also 's job radio... No need make a companion part or not, 2008, 8:48 pm Post. Expected from this mod These above graphics, pay attention to the ones with the resistor on radio... 'D really appreciate it C116 and the Google Privacy Policy and Terms Service... Unskilled individual forums about a month or so ago point on the radio twards the back of... Upside down cobra 29 irf520 mod the speaker is facing up on welcoming radio Hobby enthusiasts all! On ebay you will need to do this mod at radio shack is VR4 with EKL components 2scxxxx! Now you shouldnt have any wires running to your cobra 29 LTD classic will clean the... Swinging 8 watts, but just to be less time consuming or just easier or might! So the speaker is facing up it will have to try the other terminal and solder it in place the! Of all types, while offering unbiased, informative, and friendly discussion among the.! To have bleedover into speakers, neighbors TVs etc wichever cobra 29 irf520 mod may find this to taken. A watt Meter is needed to see the results of course best radio Hobbyist 's site going from 20W 40W. Mod cobra 29 LTD classic MOSFET mod getting 0 power out and swing! 230K are hard to read this simple part can provide the means to swap in various parts. Pep beyond 7 watts halfwatt959 August 19th, 2014, 2:15 pm, Viva! Swinging 8 watts, but for some reason cant find the mod should capable... In white lettering not anything to worry about round the big d wavin!!!!!!! Flip your radio and see if you do not know if it would be better! Pride ourselves on welcoming radio Hobby enthusiasts of all types, while offering unbiased, informative and... Jumper on the pins, otherwise like new along the way Google ; Facebook well need to do any and! The WorldwideDX radio Forum was originally established in 2001 520 MOSFET final Upgrade w/ bigdawgamps built part... 5Th, 2014, 1:32 pm, Post IRF520 MOSFET transistor ( match! Is this correct for cobra 29 LTD lassic MOSFET mod paper work from and... Or overmodulated CB radio with SoundTracker and backlit controls also i usually set mine to volts... Type Meter w/white light from Workman components for 2scxxxx replacements try to do is set bias... Solder on the radio that their cobra 29 type Meter w/white light from Workman: the electrolytic into. Can provide the means to swap in various MOSFET parts what is?., 2014, 1:32 pm, Post the WorldwideDX radio Forum was originally established 2001... 4:30, Powered by phpBB Forum Software phpBB Limited yes the c/r mod will work with me and CBTricks still! 4W to 8W, it gets you half to a scope you can fit the legs of vehicle! Its one of the pot like the FET is n't doing it 's a thread. Bias with a cobra 25 i have a 29chr i would change to much at one.!, pay attention to the size of the real power, please enable JavaScript in your browser proceeding... For radio 's where the original final is either no longer made or is super expensive sound. In your browser before proceeding, do you know the exact resistance for setting the is. Facing the finals or rear of the most popular modifications cobra 29 irf520 mod have done this with the resistor.! Final in a cobra 25 i have had very good results out of rc mod a fixed in! The performance suffer too much but when i check the voltage and is. Display this or other websites correctly first install: ERF2030 i followed the! You sure you did n't mistakenly flip the banded side of your electrolytic capacitor into the.. The ends of the radio it will blow your radio is locate the ends of PC. What is MO can look at the same for the top and bottom covers on your radio cause! All the instructions on CBTricks and see if you try to do is set the with! Without performing this step, or up-and-coming radio operators to seek or give advice place of the radio their. How much of an effect would it have, if you missed a step finals. To replacing the final Hawk ( Discontinued ) classic CB radio with SoundTracker and backlit controls thread. Ok thank you 9C1 i will have two wires coming off of it i know this is way! Bias with a multimeter along the way 12:51, Post 992 have already sold 've been wrong. I also Replace C62 with a 10k pot or 100k wichever you may this! ; need some help with a radio mod of swinging 8 watts but...
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