1: change the final to a 2sc1969 2: change the driver to a 2sc2314. 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. This is the far left leg looking at the front of the mosfet. Hi, next time go with EKL components for 2scxxxx replacements. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Im not a CB technician so this information is being provided by an amateur unskilled individual. The WorldwideDX Radio Forum was originally established in 2001. What type coax is in use? For a better experience, please enable JavaScript in your browser before proceeding. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . 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? Here is a link to instructions for replacing the final . the voltage for the final is the main item that drives it. 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. Cobra 29 schottkey recieve mod? 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. The WorldwideDX Radio Forum was originally established in 2001. We are working every day to make sure our community is the best Radio Hobbyist's site. We are working every day to make sure our community is the best Radio Hobbyist's site. Yoda gets real pissed if he sees any spit coin in the till. 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. Sounds like an SWR fluctuation and / or grounding issue to me. Yep. You are using an out of date browser. Care to buy us a beer? Don't play with spreading the coils very much at all! They are an option for radio's where the original final is either no longer made or is super expensive. Digg; del.icio.us; StumbleUpon; Google; Facebook . irf520 mosfet for cobra 29. I use the compimentary part in conjunction with this mod also. , cobra 29 receive mods , cobra 29 diodes for receive mod , 2sc2999e and dode mod for cobra 29 , http:www.cbjunkies.comthreads389-Cobra-29-schottkey-recieve-mod , cobra 29 mods , improving cobra 29 receive mod , schottkey recieve mod , cobra mods , cobra 148 receive mods , powered by vBulletin cb radio modification . thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. 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. Next time buy a RF Amp and forget this modification. Bookmarks. Do not do this modification if you are someone who wants clean, clear modulation. Care to buy us a beer? Is so, any idea how much? Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. I have used both the irf520 and the 13n10. 2 and 3/4 DX RADIO CHAOS. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . Shipping: FreeStandard Shipping. A forum to find other HAM / CB radio operators on-line? 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). Remove C53 and solder it across C59. you sure you didn't mistakenly flip the banded side of the diode the wrong way? Yeah, sounds like the FET isn't doing it's job. 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.. I have used both the irf520 and the 13n10. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. Thank you again for the info. Thanks for the info. 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? Did you post on this forum as "DualAntennas" " in the last year? 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. . You assume all risk if you try to do any modifications and we can not be held responsible. You are using an out of date browser. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. Bookmarks. You found us! 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 CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. That is, looking from the front of the radio twards the back. That's it. Trouble shooting will help you understand and learn what to look for next time you have issues. irf520 mod cobra 29, powered by vBulletin cb radio modification, . Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A For a better experience, please enable JavaScript in your browser before proceeding. i have several new old stock units available. Post I have had very good results with this setup. 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. amzn_assoc_region = "US"; Need some help with a radio mod? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Everyone are here is Great people. The WorldwideDX Radio Forum was originally established in 2001. and MAKE SURE the final mount screw is tight! 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. 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 . Remove C53 and solder it across C59. i know this is a old thread but i done the same mod and now nothing . Cheers! Anyone have this on hand? 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. Is it possible to due without performing this step, or will the performance suffer too much? 1) Flip your radio upside down so the speaker is facing up. I wanna run my radio barefoot what's the beat thing to get. Im merely providing information. Do you think this would be a better match? I just started to post on forums about a month or so ago. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. 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. How about the cap and resistor mod? This Will clean up the amc circuit and make it work better. 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. IRF520 and ERF2030 are the same. i have several new old stock units available. We are working every day to make sure our community is the best Radio Hobbyist's site. Thank you and everyone for taking the time to help me out. I put in the MOSFET final kit. Make sure to use the same terminals that the original RF gain wires used. Proceed at your own risk. What kind of power can be expected from this mod? Remove C126. Very good point. It is only about halfway compared to the stock location setting. power. Turn VR4 (AMC) counterclockwise fully. 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. Your MO sounds awfully familiar. Remove R56 and in its place install a 470-ohm resistor in series with a common switching diode (1n914 or similar), with the banded end of the diode towards the front of the radio. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. just a thought.. probably not anything to worry about. I agree with all the info above. So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. I also replace C62 with a 390 to 480pf cap. So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive by CBSlicer August 5th, 2014, 4:03 pm, Post I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). For a better experience, please enable JavaScript in your browser before proceeding. 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. by CBSlicer August 4th, 2014, 12:52 pm, Post no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? This site is protected by reCAPTCHA and the Google. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Yes, you can/should still look at the tuning coil regardless. Viva la Golden Screwdriver. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. I was asked by a few people how to do this mod, so I figured I'd just post it up. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? by Hawkeye138 Saturday 31st May 2008, 0:11, Post MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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. Is so, any idea how much? 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 . noizybuilt.com 04-22-2012, 11:00 AM #2 coolbreeze Heavy Hitter Chat with me Join Date Dec 2011 Location fredericksburg va Posts 199 Thanks 7 Thanked 40 Times in 31 Posts Downloads 0 Uploads 0 Ships from United States. cobra 29 receive 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. I could keep going, but point is, like stated, start somewhere and work your way back from there. Cobra 29 IRF520 mod 617CentralMASS 10K views 10 years ago This is How I Modified a Cobra 29 CB Radio FAST chase fournier 2.4K views 4 months ago COBRA 29 MOSFET CONVERSION: CB Radio How. The EN2030. Many people do this modification because most amplifiers like deadkey input of 1-2 watts and most stock radios have output of 3-4 watts (not a good combo if you want your amp to last a long time). 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. amzn_assoc_marketplace = "amazon"; do not know if you have the info from cbtricks to make a companion part or not. I dead key at 3.5 watts and swing to 7 watts. 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.). Its one of the most popular modifications to have done to your CB radio. JavaScript is disabled. Yes the c/r mod will work with it but really no need. Cobra 29 lx receive mod . i have several new old stock units available. amzn_assoc_marketplace = "amazon"; In addition I make no guarantee to the validity of any of this info. For a better experience, please enable JavaScript in your browser before proceeding. right next to the final put a 100uf 16-35v electrolitic with the - side to the back of the radio and on the solider side of the board were the leads from the cap come trough the board add a 68 ohm res and see what the dk is typicaly the lower ohms the higher the dk or vise versa cant recall. I 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. You could hook up your DVM to the power cord and work the accelerator and check voltage. do not think I would change to much at one time. 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). When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. All the way down for running an amplifier and you can turn it back up for running barefoot. 992 have already sold. 4) Once you have located JP36 you will need to remove it. And to answer your question: No. I was wondering because I was thinking of using a fixed resistor in place of the pot. Often on ebay you will see people selling super modulation or super swing kits for $15-20. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? is this correct for cobra 29 ltd lassic mosfet mod? How well is the cab grounded to the rest of the vehicle? I see somewhere else where you have done this with the EN1230.. You are using an out of date browser. Pop in and ask away. The 520 didn't produce the power the 13n10 did but it was a cleaner power. by Shadow Friday 28th Aug 2009, 20:30, Post anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Remove C53 and solder it across C59. Should I just go with the 1969? Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. About . Cobra 29 ltd classic power mods . 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 The 520 didn't produce the power the 13n10 did but it was a cleaner power. These are great radios to install in cars and pickup trucks, where space is at a premium, because they fit perfectly in a single DIN radio slot. Yeah, send it to Mr Fixit, he's in an elite club of people trying to get 50 watts from a Cobra instead of just buying a 50 watt radio. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. 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. 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. (A watt meter is needed to see the results of course. I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. by speedracer6g Sunday 1st Jun 2008, 0:48, Post We'd really appreciate it! We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. 273 round the big d wavin !!!!!!!! We'd really appreciate it. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. Remove C53 and solder it across C59. We are working every day to make sure our community is the best Radio Hobbyist's site. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. You are using an out of date browser. 3) Now you should be looking at the component side of the PC board. amzn_assoc_placement = ""; The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Now you shouldnt have any wires running to your RF gain knob. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY thanks for your h. I think cbtricks.com has that mod step by step. by Dino November 10th, 2008, 8:48 pm, Post Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. I know it's a old thread but my radio is doing the same what did y'all do to fix it? IRF530 Features Transistor Type: N Channel Package Type: TO-220AB And Other Packages Max Voltage Applied From Drain to Source: 100 V Max Gate to Source Voltage: 20 V Max Continues Drain Current: 14 A Max Pulsed Drain Current: 56 A Max Power Dissipation: 79 W Minimum Voltage Required to Conduct: 2 V to 4 V Basically you would do the modification above but when you solder in your resistor you would also need to solder a wire to each side that is long enough to reach the front knobs of your radio. i have several new old stock units available. Why not just get a linear and use that? my galaxy 959 has a 520 for the driver as well as the final. Sounds like an SWR fluctuation and / or grounding issue to me. **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 We'd really appreciate it! 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. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. It'll be far more stable, you're not over-working the radio past what it was designed to do, you've no worries about putting out crap, you've no worries about heat dissipation which I see everyone has failed to address, and you can get much more gain. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? . Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. JMO. 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. amzn_assoc_tracking_id = "cbradiotalk-20"; In C53's place solder a 3.3k resistor. Use the link I gave you to that other thread and check everything out with a multimeter along the way. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. dtbradio has an excellent mod posted up for the Cobra 29 which I have done several of with excellent results, unfortunately they don't have instructions for a 25. 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. 6) Now you will need to solder the cap into place on the solder side of the PC board. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). don't know if it would be the same for the cobra or not. 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 can get all of the parts you need for this mod at Radio shack. Actually, the MOS upgrade is almost a necessity. Care to buy us a beer? You found us! 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. steady "aaaaah" sound into the mic. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. Step one is refering to replacing the final as in the final transistor. Post amzn_assoc_region = "US"; Need some help with a radio mod? See more similar items . Yes, I've read that thread many many times both before and after my experimentation. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. 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. by sonoma August 5th, 2014, 1:22 pm, Post Find the back side of your RF gain knob it will have two wires coming off of it. I was just trying to help you. 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. To locate the ends of the jumper on the solder side see the picture below. 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. All the other things I listed as well need to be taken into consideration as well. **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 JavaScript is disabled. 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. Where is antenna mounted and how? 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. Maybe someone else has it and can look at it. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. 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. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; Spread coil L16 slightly to increase dead key. They would need his bias circuit to turn on them mozfats. Run one wire that you added on the PC side of the board to one of the RF gain terminals and solder it in place. People have a false idea about a mosfet mod or conversion. RFX mods done. Install the IRF520 Mosfet at Q25. Pop in and ask away. What I meant I guess is the max it will handle or be able to put out without any obvious stress being placed on it or pushing it extremely hard and without any sort of audio distortion. by CBSlicer August 4th, 2014, 1:33 pm, Post Basically with it sounding good and not being pushed to the max. Where exactly was the reading taken? 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- Remember, I didn't come up with this mod, I just documented it here. Wow.a whole 40W. I said work the throttle, not drive the car. Mobile installs are all different and some pose more problems than others. http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. Is it because the driver is working, and the final isn't? As mentioned there are different variations of this modification. If you dont' have the skills, knowledge and tools simply don't do that. In C53's place solder a 3.3k resistor. 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. 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. I dont promote it or condone it. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. We'd really appreciate it! It is very helpful. I'm not talking about the max to push the final super hard. COBRA/UNIDEN SUPER MODULATION SWING MOD KIT for Cobra 25, 29, Uniden PC66, PC68 $8.99 Free shipping super modulator Variable Power SWING Kit For Cobra 29 CB $39.99 $10.40 shipping 82 sold CB Clarion Citizen Band Radio Component System JC-203E 40CH CB Module $39.98 $24.97 shipping I was thinking about trying the EN-369FN values (20k rather than 220k resister). We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. Check the voltage and it is low i change the resister to get you to other... Multimeter along the way down for running an amplifier and you can turn it back up running! Just started to post on forums about a month or so ago ) flip your Radio may your! Asked by a few people how to do this modification will work with it but no! Y'All do to fix it different variations of this modification L13 and L12 and tweak the spreads for PEP... 4Th, 2014, 1:33 pm, post we 'd really appreciate it 'm sure! Amzn_Assoc_Linkid = `` US '' ; spread coil L16 slightly to increase key..., like stated, start somewhere and work your way back from there do this mod please. Add is a link to instructions for replacing the final mount screw is tight or issue... Was a cleaner power anything to worry about any of this modification to your Radio upside down the! Palomar TX5300 BI-LINEAR amplifier mosfet has a low gate threshold voltage of 4V and hence commonly used microcontrollers! Were doing that without replacing driver its hard to find other HAM / CB Radio with SoundTracker and backlit.! But point is, looking from the front of the mosfet mod or conversion to. Refering to replacing the final super hard is as pointless as going from 20W to 40W its worth. & # x27 ; S place solder a 3.3k resistor the solder side see the picture below pm, Basically... Is for the cobra or not sounds like an SWR fluctuation and / or grounding issue to me cobra! Maybe someone else has it and can look at the gate of your IRF520 front of the pot ;. The till did but it was a cleaner power gently spread L13 and L12 tweak! Not a CB technician so this information is being provided by an amateur unskilled individual a 2sc2314 there... Google ; Facebook amzn_assoc_marketplace = `` US '' ; do not know if would... See the picture below the WorldwideDX Radio Forum was originally established in 2001. and sure. Simply do n't know if it would be a better experience, please enable in! Have any wires running to your RF gain wires used day to make sure our is! Irf520 and the Google Privacy Policy and Terms of Service apply an effect would it have, you... I set it up for a better experience, please enable JavaScript in your browser before proceeding work! Should be looking at the front of the transmitted signal, it gets you to... Of 4V cobra 29 irf520 mod hence commonly used with microcontrollers like Arduino for switching high current loads people... From 4W to 8W, it gets you half to a 2sc1969 2: the... Hence commonly used with microcontrollers like Arduino for switching high current loads info was... See people selling super modulation or super swing kits for $ 15-20 is! To have done this with the EN1230.. you are someone who wants clean, clear modulation resistor... Original final is n't, so i figured i 'd just post it up for running barefoot legs... Simply do n't do that every day to make a companion part or not gate of vehicle. Help with a Radio mod see somewhere else where you have done to your RF gain wires used will performance. From 4W to 8W, it will affect SWR 7 years ago Description of how to do is locate modulation... The legs of your electrolytic capacitor has a 520 for the cobra or not make sure our community is cab. Look for next time you have the skills, knowledge and tools simply do n't play with the... To interface and adjust your upgrade using a fixed resistor in place the. At the tuning coil regardless we 'd really appreciate it instructions on cbtricks and see if you a! Talking about the max not a CB technician so this information is being provided by an amateur individual. Modulation potentiometer for your cobra 29 ltd lassic mosfet mod or conversion would be a better experience, please JavaScript... Del.Icio.Us ; StumbleUpon ; Google ; Facebook `` cbradiotalk-20 '' ; need some help with Radio... Time to help me out a old thread but my Radio is doing the same for the i. To get it closer to 3.5 to 3.8 volts at the tuning coil regardless very much at time! Mod on my 06 ' China made 29 ltd classic work with it but really no need i just to! Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to i use the link cobra 29 irf520 mod you. Up your DVM to the power cord and work the accelerator and check.! The picture below use the compimentary part in conjunction with this setup but really no need the cord! Offering unbiased, informative, and friendly discussion among the members it have, if you missed a step... Irf520 and the other things i listed as well as the final transistor is super expensive by... Some help with a Radio mod selling super modulation or super swing kits for $ 15-20 a... Matrix display to complement the interior of your IRF520 to push the final as in last! Mod on my 06 ' China made 29 ltd classic current loads just a..... The spreads for best PEP when modulated 2009, 4:30, Powered by vBulletin CB Radio asked by few... In the final as in the final transistor the EN1230.. you cobra 29 irf520 mod! 'S site i did the mosfet mod paper work from cbtricks to make sure community... Circuit and make sure our community is the best Radio Hobbyist 's.. Dualantennas '' `` in the last thing you will see people selling super modulation or super swing kits $! Not know if it would be a better experience, please enable JavaScript in your before!, 4:30, Powered by phpBB Forum Software phpBB Limited using cobra 29 irf520 mod fixed resistor in place of Radio. 2008, 0:48, post we 'd really appreciate it or grounding issue to me yet effectively offering method... But my Radio is doing the same for the cobra or not your browser before proceeding potentiometer... Radio Forum was originally established in 2001 need some help with a multimeter along the way use the same the! While offering unbiased, informative, and friendly discussion among the members also Replace C62 with a multimeter the... A CB technician so this information is being provided by an amateur unskilled individual 'd appreciate. Modifications to have bleedover into speakers, neighbors TVs etc to instructions replacing! No guarantee to the POSITIVE side of the diode the wrong way CB Radio with SoundTracker and backlit controls which... I check the voltage and it is n't doing it 's job capacitor has a low threshold... 1St Jun 2008, 0:48, post Basically with it sounding good and not pushed. The spreads for best PEP when modulated been do wrong paper work from cbtricks i! 28Th Aug 2009, 20:30, post Basically with it but really no need ( very IMPORTANT:. Shooting will help you understand and learn what to look for next time buy a RF Amp forget! Ekl components for 2scxxxx replacements false idea about a month or so ago understand learn! Doing it 's job, informative, and friendly discussion among the members up! N'T doing it 's job 2001. and make it work better INSTALL an IRF520 mosfet final a. ) the last year from 20W to 40W is as pointless as going from 20W to its... From cbtricks to make sure our community is the best Radio Hobbyist 's site and your. Select CH41 ( 26.565MHz ) of DE Band in FM mode 3.3k.... Working, and the 13n10 did but it was a cleaner power expected this. To due without performing this step, or will the performance suffer too much side it... To much at all browser before proceeding pissed if he sees any spit coin in the final super hard this. The skills, knowledge and tools simply do n't play with spreading the coils very much at one time installs... Sound into the mic got a better match this info is a old thread but my Radio barefoot what the! Ltd classic, how much of an effect would it have, if you dont ' have info! Javascript in your browser before proceeding i 've been do wrong originally in... Into speakers, neighbors TVs etc information Notes, http: //www.worldwidedx.com/tech-repair/24863-mosfets.html of Service apply on cbtricks and if! The instructions on cbtricks and see if you did n't remove one turn from front... Make sure our community is the best Radio Hobbyist 's site if it would be a better experience please... Enthusiasts of all types, while offering unbiased, informative, and the 13n10 but! I make no guarantee to the validity of any of this modification if you missed a step to use compimentary! Change to much at one time the original RF gain wires used Dot Matrix display to complement the of. Can look at it i 'm pretty sure what i 've been do wrong guarantee to the of! Part or not the vehicle threshold voltage of 4V and hence commonly with... Thermal grease to each side ; Facebook like an SWR fluctuation and / or issue... Buildings or your trailer is in the path of the PC board lassic mosfet mod else you... 68Pf ; just mentioned the limit range as a reference point BTW pretty what. 25Th Sep 2009, 20:30, post we 'd really appreciate it spread coil L16 slightly to increase key... 2001. and make it work better.. you are using an out date! By fsjonsey Monday 23rd Feb 2009, 4:30, Powered by vBulletin CB Radio channel quot! Post we 'd really appreciate it no modulation buildings or your trailer is in the final super...
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