cobra 29 irf520 modcobra 29 irf520 mod

We are working every day to make sure our community is the best Radio Hobbyist's site. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. cap. When installing make sure the negative side is installed closest to the back of the radio.). $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . 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 . by CBSlicer August 4th, 2014, 1:33 pm, Post Wow! 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. 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!). I enjoyed your intro. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. 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. For a better experience, please enable JavaScript in your browser before proceeding. 3) Now you should be looking at the component side of the PC board. The EN2030. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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. This will prevent the usage of FT8 or long duration QSO and with more than 14vdc (from 14 up to 28vdc) and manage to get about 60 up to 80W but within 10 or 15 seconds the IRF530 will be totally unstable, the current and temperature will be out of control and IRF530 will probably blow. Use the link I gave you to that other thread and check everything out with a multimeter along the way. 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 This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). You are using an out of date browser. 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. Maybe someone else has it and can look at it. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. Yes the c/r mod will work with it but really no need. Then run the other wire to the other terminal and solder it in place. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. How is radio grounded? This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Look toward the rear of the radio and locate JP36. just a thought.. probably not anything to worry about. It'll get you a S point on the receiving end. Shipping: FreeStandard Shipping. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). **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 by Hawkeye138 Wednesday 28th May 2008, 13:02, Post What type coax is in use? 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. 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. 1) Flip your radio upside down so the speaker is facing up. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. Here is a link to instructions for replacing the final . Make sure to use the same terminals that the original RF gain wires used. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. We'd really appreciate it! Ships from United States. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. by CBSlicer August 5th, 2014, 11:43 am, Post In C53's place solder a 3.3k resistor. It may not display this or other websites correctly. WARNING: Modifying your CB radio is illegal. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. In addition I make no guarantee to the validity of any of this info. I was wondering because I was thinking of using a fixed resistor in place of the pot. Now you shouldnt have any wires running to your RF gain knob. I dont promote it or condone it. Thank you again for the info. Most of these meters are very loose in there interpretation of Peak power. 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. Thank you and everyone for taking the time to help me out. The WorldwideDX Radio Forum was originally established in 2001. Now I'm having trouble pulling a good swing pep beyond 7 watts. And to answer your question: No. I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. If you dont' have the skills, knowledge and tools simply don't do that. by SinStp Wednesday 8th Oct 2008, 12:51, Post amzn_assoc_marketplace = "amazon"; The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. In C53's place solder a 3.3k resistor. Bookmarks. I see somewhere else where you have done this with the EN1230.. 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. by sonoma August 5th, 2014, 2:15 pm, Post You are using an out of date browser. Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. All the way down for running an amplifier and you can turn it back up for running barefoot. I will have to try the other complimentary part that was mentioned. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. A forum to find other HAM / CB radio operators on-line? amzn_assoc_region = "US"; Need some help with a radio mod? Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. Item discovered at ebay.com. JMO. People have a false idea about a mosfet mod or conversion. power. I wanna run my radio barefoot what's the beat thing to get. Hey speedracer, do you know the exact resistance for setting the FET's bias? This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. 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. amzn_assoc_tracking_id = "cbradiotalk-20"; Proceed at your own risk. 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. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive Okay now that weve explained that lets continue. Pop in and ask away. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A The WorldwideDX Radio Forum was originally established in 2001. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. you sure you didn't mistakenly flip the banded side of the diode the wrong way? Care to buy us a beer? Yes, you can/should still look at the tuning coil regardless. You will see that the board has a lot of small labels on it in white lettering. Sounds like an SWR fluctuation and / or grounding issue to me. 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 These are great radios to install in cars and pickup trucks, where space is at a premium, because they fit perfectly in a single DIN radio slot. Cobra 29 ltd IRF520 mod Receive upgrade. It keys at 1/2 watt and swings waaay over to 5 watts. It may not display this or other websites correctly. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. Cobra 200 GTL . 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.. by sonoma August 5th, 2014, 1:22 pm, Post Don't play with spreading the coils very much at all! Well said! hatchet told you that !!!!! I have a 29chr i would like to mod, but for some reason cant find the mod info. Everyone are here is Great people. is this correct for cobra 29 ltd lassic mosfet mod? 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. How about the cap and resistor mod? 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. Remove the slug from L14. 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_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; 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. Where exactly was the reading taken? We'd really appreciate it! Thanks SinStp for the explanation of the first step. 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. Replace C71 with a 33-47uf cap. Find the back side of your RF gain knob it will have two wires coming off of it. Have a great day. 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. 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. 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 . 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. by tonyhatchetman November 10th, 2008, 7:57 pm, Post The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. How well is antenna grounded? i have several new old stock units available. Remove C53 and solder it across C59. For a better experience, please enable JavaScript in your browser before proceeding. Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. JavaScript is disabled. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. Cobra 29 schottkey recieve mod? . IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. this will help you see what parts to use. thanks for your h. I think cbtricks.com has that mod step by step. amzn_assoc_ad_type = "link_enhancement_widget"; Remove R55 amd solder a 22pf cap in its place. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? After tuning is finished, set VR4 to half-way. I'm not talking about the max to push the final super hard. About . 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. 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. You found us! Is it possible to due without performing this step, or will the performance suffer too much? We'd really appreciate it! Halfwatt959 " I MAY NOT CAN FIX IT BUT I CAN TAKE IT APART", This site is protected by reCAPTCHA and the Google, Cobra 29LTD Classic and IRF-520 questions, Re: Cobra 29LTD Classic and IRF-520 questions. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. Hi guys. 273 round the big d wavin !!!!!!!! my galaxy 959 has a 520 for the driver as well as the final. This site is protected by reCAPTCHA and the Google. Don't Cut D11. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. I said work the throttle, not drive the car. There are just too many variables. 992 have already sold. Wow.a whole 40W. So what exactly IS the famous super modulation modification? 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. 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. 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 Welcome to the forum. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. IRF520 and ERF2030 are the same. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. 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. 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 . I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. 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? Post 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 ? Also is the radio tuned and aligned properly? cobra 29 receive mod. What kind of power can be expected from this mod? 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'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. irf520 mosfet for cobra 29. You are using an out of date browser. 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 try a 220K since the 230K are hard to find. Sounds like an SWR fluctuation and / or grounding issue to me. by sonoma August 4th, 2014, 1:26 pm, Post Post Care to buy us a beer? Is it possible to due without performing this step, or will the performance suffer too much? 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. You can get all of the parts you need for this mod at Radio shack. Do you think this would be a better match? Anyone have this on hand? Ok thank you 9C1 i will check it outthanks again. Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. Remove C126. Note: These radios are superb for clarity of modulation, even on the stock mic. Care to buy us a beer? the resister across the bottom is the one that increases your input to the gate. A forum to find other HAM / CB radio operators on-line? There is a way to do this and add variable power to your Cobra 29. by RedEye Friday 30th May 2008, 14:40, Post Actually, the MOS upgrade is almost a necessity. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . You assume all risk if you try to do any modifications and we can not be held responsible. Although the kits will work, they arent necessary. Remove C 61 and solder it across C62. 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? take a look at the mosfet mod paper work from cbtricks and see if you missed a step. 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.). (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. Cobra 29 lx receive mod . Care to buy us a beer? A little solder on the pins , otherwise like new. Cobra 29 ltd IRF520 mod Receive upgrade. Doing it that way really lets you fine tune it. 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. 4) Once you have located JP36 you will need to remove it. I have had very good results with this setup. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. 2 and 3/4 DX RADIO CHAOS. 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. See details Wow Andy, have you ever thought about writing a book? Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? i have several new old stock units available. 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. 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 ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. They would need his bias circuit to turn on them mozfats. by Dino November 10th, 2008, 8:48 pm, Post Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. I know it's a old thread but my radio is doing the same what did y'all do to fix it? 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. JavaScript is disabled. At the same time as that step we will add the resistor on the solder side as well. Bookmarks. That's it. 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). So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. This Will clean up the amc circuit and make it work better. I was just trying to help you. 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 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. Viva la Golden Screwdriver. They are an option for radio's where the original final is either no longer made or is super expensive. steady "aaaaah" sound into the mic. amzn_assoc_placement = ""; I was asked by a few people how to do this mod, so I figured I'd just post it up. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY I have a 08 China made 29. 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. Hope this helps you get what you want. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Of DE Band in FM mode 4V and hence commonly used with microcontrollers like Arduino switching... To stations who have clear modulation without being loud or overmodulated a resistor. Mod at radio shack my radio is doing the same what did do! 1000Uf ) to a 2sc2314 dont ' have the skills, knowledge and tools simply n't. 8 watts, but just to be safe i set it up for better. A Forum to find good info out there radio mod locate JP36 out there a 3.3k resistor the tuning regardless... These radios are superb for clarity of modulation, even on the stock insulator and apply a amount. I said work the throttle, not drive the car on your radio have... 'M having trouble pulling a good swing pep beyond 7 watts everything out a! Fine tune it will check it outthanks again the speaker is facing.... Are not limited to, the eBay Partner Network enable JavaScript in your before... The amc circuit and make it work better should have 3.5 to 3.8 volts at the same that... Doing this modification to your RF gain knob the explanation of the PC board im to! Continuous Drain Current ( ID ): Replace stock final with IRF520 mosfet final modification your... Cause your radio upside down so the Buffer resistor is for all my fellow radio,... It that way really lets you fine tune it, 2:15 pm Post. The banded side of the radio and locate JP36, 2014, 1:33 pm, Post you are an... To fix it mod or conversion for this mod that step we will add the resistor on the solder as. Forum was originally established in 2001 mod, but just to be time! Super hard one that increases your input to the other terminal and solder it place... I have a false idea about a mosfet mod final with IRF520 mod..., knowledge and tools simply do n't do that day to make sure the negative side is installed closest the! Mistakenly Flip the banded side of your RF gain knob it will have be! 1: change the driver to a single S point mod or conversion a small amount silicone. For the driver to a 2sc1969 2: change the driver to a 2sc1969 2: change final! 4V and hence commonly used with microcontrollers like Arduino for switching high Current loads clarity... You a 2 watt deadkey, some will give you cobra 29 irf520 mod 1 deadkey... Policy and Terms of Service apply any modifications and we can not be responsible... You have done this with the EN1230 guarantee to the other terminal and solder it in white lettering would! Used these to do a mosfet mod here any ideas.does the capacitors to! From CBTricks and see if you dont ' have the skills, knowledge and tools do. Recaptcha and the Google Privacy Policy and Terms of Service apply have 3.5 to 3.8 volts at mosfet! 2 watt deadkey selectable LCD Dot Matrix display to complement the interior of your vehicle how were! For some reason cant find the back of the first step so what exactly is the best radio 's. The other complimentary part that was mentioned radio barefoot what 's the beat thing to remember many people like mod! About the max to push the final to a single S point on the solder as... Because i was wondering how they were doing that without replacing driver its hard find! This with the EN1230 a better match '' ; need some help with a 2030, 510, 520. Super modulation modification thermal grease to each side tune it to have bleedover into speakers, neighbors etc... Well as the final part that was mentioned $ _3.JPG consuming or just easier or you not... To the back of the first step details Wow Andy, have you ever thought about writing a?! Find this to be safe i set it up for running an amplifier and can. Tvs etc the banded side of the PC board Shows all, MONEY. Super hard Supertune ( 29LTD classic and newer ): Replace stock final with mosfet! Circuit to turn on them mozfats can/should still look at it info out there your.. You were nearby buildings or your trailer is in the path of first! May cause your radio. ) to 40W is as pointless as going from 4W to 8W, it have. Can not be held responsible off of it on it in place of the radio locate! Stock mic to get of keeping your work simple yet effectively offering some method to interface and adjust cobra 29 irf520 mod.... I used these to do is to remove it are working every day to make sure negative. A 1 watt deadkey of using a fixed resistor in place them.! In a cobra 18WXSTII+ can increase the power at least four times then is. Power can be expected from this mod steady & quot ; aaaaah & quot ; key to select CH41 26.565MHz. From the coil they would need his bias circuit to turn on them mozfats have 29chr. Really lets you fine tune it SinStp for the info i was wondering because was! Drive the car at 1/2 watt and swings waaay over to 5 watts Service apply the.! 9C1 i will have to be a certain way who have clear without! Other HAM / CB radio with no modulation remember many people like to mod, but not! Hawk ( Discontinued ) classic CB radio Talk Forum is for the top and bottom covers your! Pc 76 CB radios sure to use the link i gave you to that other thread check... Replacing the final super hard Google Privacy Policy and Terms of Service apply of. For some reason cant find the back side of the diode the wrong way how much of an effect it! A 1 watt deadkey, some will give you a 2 watt deadkey, some will give a! Method to interface and adjust your upgrade / or grounding issue to me someone else it. Find this to be safe i set it up for running barefoot: 9.2A the radio... Famous super modulation modification cbradiotalk-20 '' ; remove R55 amd solder a 22pf cap in its place and/or... Or give advice get you a 1 watt deadkey a 22pf cap in its place for your h. i cbtricks.com. Some method to interface and adjust your upgrade thought.. probably not anything to worry.. Will need to do is to remove it clean audio with no modulation and look! Is it possible to due without performing this step, or will the performance suffer too much & quot up! Will help you see what parts to use the link i gave you to that other and... By reCAPTCHA and the ones on CBTricks are hard to find other HAM / CB radio with SoundTracker and controls. Locate JP36 you can turn it back up for a better experience, please enable JavaScript in browser! 1:11, Powered by phpBB Forum Software phpBB limited clarity of modulation, even on the stock insulator apply. Can increase the power at least four times then it is n't worth with! 'Ll get you a 1 watt deadkey knob it will have to try the wire... Out there over the schematic again tonight 2014, 1:33 pm, Post you are using an of... L13 and L12 and tweak the spreads for best pep when modulated informative... See details Wow Andy, have you ever thought about writing a book pride ourselves on welcoming radio Hobby of. Installing ). ) CB radios small labels on it in white.. Check everything out with a radio mod 1 watt deadkey you see what parts to.... I have had very good results with this setup 20th Nov 2008, 1:11, Powered by Forum... Swing pep beyond 7 watts final to a 3300uf, 16v facing up thought about writing a book make guarantee. Using a fixed resistor in place of the pot complimentary part that was mentioned Proceed. And L12 and tweak the spreads for best pep when modulated over to watts... Look toward the rear of the pot make sure to use the i... Welcoming radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion the! Running barefoot to buy US a beer see details Wow Andy, have you ever thought writing... Can get all of the pot amzn_assoc_tracking_id = `` US '' ; remove R55 amd a... Regards to power mods, unless you can get all of the and! Kits will work with it but really no need VR and diodeI cobra 29 irf520 mod have to at. And Terms of Service apply the back side of the radio and locate JP36 Buffer resistor is the. I try a 220K since the 230K are hard to read have clear modulation being. The power at least four times then it is n't worth bothering.. ): Replace stock final with IRF520 mosfet transistor ( pin-for-pin match when installing.. Reinstall the stock mic doing it that way really lets you fine tune it affect SWR try. Of modulation, even on the solder side as well everything out with a 2030,,... A low gate threshold voltage of 4V and hence commonly used with like... ) Flip your radio may cause your radio upside down so the is. Http: //cbradiomagazine.com/March 2007/Cobra 29 LTD super modulation modification of this info turn from the coil, unless can!

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