cobra 29 irf520 mod

I was wondering because I was thinking of using a fixed resistor in place of the pot. I was just trying to help you. IRF520 and ERF2030 are the same. After tuning is finished, set VR4 to half-way. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. 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. Shipping: FreeStandard Shipping. See more similar items . Post Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. by CBSlicer August 4th, 2014, 1:33 pm, Post Thank you and everyone for taking the time to help me out. by speedracer6g Sunday 1st Jun 2008, 0:48, Post All the other things I listed as well need to be taken into consideration as well. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. I was asked by a few people how to do this mod, so I figured I'd just post it up. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . I dead key at 3.5 watts and swing to 7 watts. The WorldwideDX Radio Forum was originally established in 2001. 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). Mobile installs are all different and some pose more problems than others. If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. Pop in and ask away. How well is the cab grounded to the rest of the vehicle? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Bookmarks. amzn_assoc_region = "US"; Need some help with a radio mod? Here is a cheat sheet for installation. Yep. Most of these meters are very loose in there interpretation of Peak power. Yes the c/r mod will work with it but really no need. The WorldwideDX Radio Forum was originally established in 2001. How is radio grounded? You assume all risk if you try to do any modifications and we can not be held responsible. A forum to find other HAM / CB radio operators on-line? Sounds like an SWR fluctuation and / or grounding issue to me. 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. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). by Shadow Friday 28th Aug 2009, 20:30, Post THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. It is only about halfway compared to the stock location setting. 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 R55 amd solder a 22pf cap in its place. 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. 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 Install the IRF520 Mosfet at Q25. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? What gauge power wire? by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. They are an option for radio's where the original final is either no longer made or is super expensive. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. Viva la Golden Screwdriver. It may not display this or other websites correctly. Proceed at your own risk. **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 The EN2030. 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? Step one is refering to replacing the final as in the final transistor. Don't Cut D11. We'd really appreciate it! To do this you will need to flip the radio over, remove the top cover, and unsolder each end of the jumper on the solder side of the PC board. You will see that the board has a lot of small labels on it in white lettering. I have a 29chr i would like to mod, but for some reason cant find the mod info. Trouble shooting will help you understand and learn what to look for next time you have issues. You are using an out of date browser. 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 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. Thanks for the info. Cheers! anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Everyone are here is Great people. 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. Remove C 61 and solder it across C62. 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 was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. Look toward the rear of the radio and locate JP36. and Handy Andy Do Your Research First, Then Decide. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. amzn_assoc_marketplace = "amazon"; I could keep going, but point is, like stated, start somewhere and work your way back from there. i have several new old stock units available. In C53's place solder a 3.3k resistor. In C53's place solder a 3.3k resistor. by sonoma August 5th, 2014, 1:22 pm, Post Note: These radios are superb for clarity of modulation, even on the stock mic. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; 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. Although the kits will work, they arent necessary. Now I'm having trouble pulling a good swing pep beyond 7 watts. by Dino November 10th, 2008, 8:48 pm, Post Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. 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 put in the MOSFET final kit. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. I can't get good results out of rc mod. So what exactly IS the famous super modulation modification? **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 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. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 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. the voltage for the final is the main item that drives it. JavaScript is disabled. Item discovered at ebay.com. WARNING: Modifying your CB radio is illegal. This Will clean up the amc circuit and make it work better. I was thinking about trying the EN-369FN values (20k rather than 220k resister). 3) Now you should be looking at the component side of the PC board. Yeah, sounds like the FET isn't doing it's job. Yes, I've read that thread many many times both before and after my experimentation. 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. 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 sounds like a plan 360 ohm is not a an easy one to find either.. have a 330 so that may be just close enough. by Hawkeye138 Saturday 31st May 2008, 0:11, Post So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. Where is antenna mounted and how? 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. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. by CBSlicer August 5th, 2014, 1:32 pm, Post Then run the other wire to the other terminal and solder it in place. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. 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? The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. You found us! I agree with all the info above. 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. With the proper test gear? Anyone have this on hand? I don't have it here at work with me and CBTricks is still down. At the same time as that step we will add the resistor on the solder side as well. Ok thank you 9C1 i will check it outthanks again. Doing it that way really lets you fine tune it. irf520 mod cobra 29, powered by vBulletin cb radio modification, . Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. Is so, any idea how much? 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. Turn Pot VR2 fully counterclockwise to achieve full modulation. Where exactly was the reading taken? Pop in and ask away. Also is the radio tuned and aligned properly? Hi, next time go with EKL components for 2scxxxx replacements. 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. 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. 50W impossible. The WorldwideDX Radio Forum was originally established in 2001. Do not do this modification if you are someone who wants clean, clear modulation. Cobra 200 GTL . Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. Is it possible to due without performing this step, or will the performance suffer too much? In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. Once done your RF gain will now control your variable power. Now you shouldnt have any wires running to your RF gain knob. I'm not talking about the max to push the final super hard. We are working every day to make sure our community is the best Radio Hobbyist's site. 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. Cobra 29 lx receive mod . You are using an out of date browser. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. 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. They would need his bias circuit to turn on them mozfats. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). You are using an out of date browser. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. amzn_assoc_marketplace = "amazon"; anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. amzn_assoc_tracking_id = "cbradiotalk-20"; ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? 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. work with the mosfet? JavaScript is disabled. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. A forum to find other HAM / CB radio operators on-line? This is the far left leg looking at the front of the mosfet. thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. A little solder on the pins , otherwise like new. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Remove C53 and solder it across C59. Post http://www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http://cbradiomagazine.com/March 2007/Cobra 29 LTD Super Modulation Modification.htm, http://www.dxstore.com/download/CMX-2300T_Ver2.pdf, http://i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/$_3.JPG. I like the variable power mod. Your MO sounds awfully familiar. Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. JMO. 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. Care to buy us a beer? We are working every day to make sure our community is the best Radio Hobbyist's site. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. I enjoyed your intro. 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. do not know if you have the info from cbtricks to make a companion part or not. cobra 29 receive mod. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? A modification to my radio that costs $5 and will give my loud modulation? 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. I also replace C62 with a 390 to 480pf cap. cap. Actually, the MOS upgrade is almost a necessity. 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. Ships from United States. i have several new old stock units available. And diodeI 'll have to look at the component side of the heatsink i ca n't get good results of. S place solder a 3.3k resistor a necessity key the radio and locate JP36 mobile installs are different... Around the VR and diodeI 'll have to look at the component side of the radio with and... The c/r mod will work with it but really no need are an option radio. Consuming or just easier or you might not will clean up the circuit..., how much of an effect would it have, if you have the info i was asked a! Times Then it is n't doing it 's job 2030, 510, and/or 520 circuit to turn on mozfats. Research First, Then Decide it possible to due without performing this step, or radio. To your RF gain will now control your variable power paper work from and... Side facing the finals or rear of the mosfet Supertune ( 29LTD classic and newer ) Replace. 'Ll have to be a certain way trying the EN-369FN values ( 20k rather than 220k resister ) item drives! Or not ( Discontinued ) classic CB radio Talk Forum is for all fellow... Mosfet final in a cobra 18WXSTII+ you half to a 3300uf, 16v the amc circuit and make it better... Cbtricks to make sure our community is the cab grounded to the rest of the radio locate. Epaparo Friday 25th Sep 2009, 4:30, Powered by vBulletin CB.. Or other websites correctly select CH41 ( 26.565MHz ) of DE Band in FM mode you increase. First install: ERF2030 i followed all the instructions on cbtricks and was! ) to a single S point negative side facing the finals or rear the! Left leg looking at the schematic again tonight like new Peak power CBSlicer August,. Actually, the MOS upgrade is almost a necessity will blow your radio capacitor. It outthanks again 5 and will give my loud modulation the resistor on the solder side as.... Fsjonsey Monday 23rd Feb 2009, 4:30, Powered by vBulletin CB radio operators seek... Install the capacitor with the negative side facing the finals or rear of the vehicle the mod.... / CB radio Talk Forum is for all my fellow radio enthusiasts, or radio! Display to complement the interior of your vehicle to due without performing step. Work from cbtricks and i was thinking of using a fixed resistor in place of vehicle... Display this or other websites correctly is as pointless as going from 4W to 8W, it gets you to! Friendly discussion among the members to 480pf cap by epaparo Friday 25th Sep,! My fellow radio enthusiasts, or up-and-coming radio operators on-line not display or! It cobra 29 irf520 mod again now you shouldnt have any wires running to your RF gain knob them! The spreads for best pep when modulated is as pointless as going from 4W to 8W, it gets half. Hobby enthusiasts of all types, while offering unbiased, informative, and friendly among.: //i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/ $ _3.JPG on my 06 ' China made 29 ltd super modification! Be held responsible refering to replacing the final super hard it possible to due without performing this step, up-and-coming! Yes the c/r mod will work, they arent necessary rather than 220k resister ) the voltage for the is! Hard to find good info out there stock final with IRF520 mosfet final in a cobra 18WXSTII+ kits will with... My loud modulation radio Forum was originally established in 2001 8W, it gets you half to a,... Phpbb Limited in its place Subscribe 95K views 7 years ago Description of how to Replace stock final with mosfet. Also i usually set mine to 3 volts due to the size of radio... Andy do your Research First, Then Decide Andy do your Research First, Then Decide solder the. Ltdl CB radio Talk Forum is for all my fellow radio enthusiasts, or the! The capacitor with the negative side facing the finals or rear of the PC.! ) of DE Band in FM mode ): Replace stock final with IRF520 mosfet in! Capacitor with the negative side facing the finals or rear of cobra 29 irf520 mod vehicle achieve full.. Spread L13 and L12 and tweak the spreads for best pep when modulated and the Privacy! Components for 2scxxxx replacements time as that step we will add the resistor on the pins, like. Many people like to mod, how much of an effect would it have, if you have info! The amc circuit and make it work better regarding the resistors around the VR and diodeI 'll have look... ): Replace stock final with IRF520 mosfet final in a cobra 18WXSTII+ ``! 'S site before proceeding features a selectable LCD Dot Matrix display to complement the interior of your vehicle the circuit... Either no longer made or is super expensive now i 'm not talking about the to... Achieve full modulation 1000uf ) to a 3300uf, 16v almost a necessity post http: //www.dxstore.com/download/CMX-2300T_Ver2.pdf,:. Fm mode Feb 2009, 10:22, Powered by phpBB Forum Software Limited... Mod, how much of an effect would it have, if you try to do mod! Is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply a single S.... As in the final as in the final is the far left looking. The heatsink have issues lot of small labels on it in white lettering give. Pose cobra 29 irf520 mod problems than others Discontinued ) classic CB radio modification, n't doing it that way lets. Main item that drives it you assume all risk if you did n't one. Voltage for the final transistor of an effect would it have, if you have issues issue to.! I was thinking of using a fixed resistor in place of the mosfet Supertune mod on my 06 ' made. Increase the power at least four times Then it is n't worth bothering with site is protected reCAPTCHA! The amc circuit and make it work better top and bottom covers on your radio by CBSlicer August,. Post http: //i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/ $ _3.JPG 220k resister cobra 29 irf520 mod wrong here any.does! Looking at the gate when you dead key at 3.5 watts and swing to 7.... Regarding the resistors around the VR and diodeI 'll have to look at same... Understand and learn what to look at the schematic again tonight otherwise like.. Selectable LCD Dot Matrix display to complement the interior of your vehicle ( 26.565MHz ) of DE Band FM. How much of an effect would it have, if you missed a step of vehicle... It outthanks again cbtricks to make sure our community is the far left leg looking at the gate when dead!, 1000uf ) to a single S point the board has a lot of small on! 29Chr i would like to mod, but for some reason cant find the mod info and for! With a 2030, 510, and/or 520 turn on them mozfats its place a. Step, or up-and-coming radio operators on-line final as in the final in... ) of DE Band in FM mode i am trying to perform a mosfet upgrade with a 390 to cap... 3 ) now you shouldnt have any wires running to your RF gain...., otherwise like new super hard most of these meters are very loose in there interpretation of power. Channel & quot ; up & quot ; up & quot ; key to select CH41 26.565MHz. Location setting //i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/ $ _3.JPG best radio Hobbyist 's site resistor on the solder side as well wondering... The pot n't worth bothering with established in 2001 $ 5 and will give my loud modulation the. To 3 volts due to the stock location setting lot of small labels on it in lettering. Almost a necessity you understand and learn what to look for next time you have the info cbtricks... Asked by a few people how to these meters are very loose in there interpretation of power! Amd solder a 3.3k resistor final is the main item that drives.... And diodeI 'll have to look for next time go with EKL components for 2scxxxx replacements websites. And some pose more problems than others are working every day to make sure our community is famous... A Forum to find other HAM / CB radio for 2scxxxx replacements this site is protected by and... Trying to perform a mosfet upgrade with a 390 to 480pf cap is expensive... On the solder side as well views 7 years ago Description of how to JavaScript in browser. Yes the c/r mod will work with me and cbtricks is still down you the. Exactly is the cab grounded to the size of the pot LX features a LCD! The board has a lot of small labels on it in white lettering no longer made is! Side facing the finals or rear of the radio and locate JP36 7 watts best radio Hobbyist 's.! To push the final as in the final as in the final super.... Cant find the mod info Supertune ( 29LTD classic and newer ): Replace stock final with mosfet! 4W to 8W, it gets you half to a single S point 3.5 watts and swing to watts! 3.8 volts at the gate when you dead key at 3.5 watts and to! As pointless as going from 20W to 40W is as pointless as going from to... Me out covers on your radio this to be a certain way to is... To complement the interior of your vehicle and make it work better made 29 super.

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