Use the link I gave you to that other thread and check everything out with a multimeter along the way. I don't have it here at work with me and CBTricks is still down. Note: These radios are superb for clarity of modulation, even on the stock mic. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. This site is protected by reCAPTCHA and the Google. amzn_assoc_region = "US"; Need some help with a radio mod? Care to buy us a beer? amzn_assoc_placement = ""; Yes, I've read that thread many many times both before and after my experimentation. Should be able to get atleast 40 w from it. 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? JavaScript is disabled. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Now you shouldnt have any wires running to your RF gain knob. WARNING: Modifying your CB radio is illegal. 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. 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. Yeah, sounds like the FET isn't doing it's job. 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. With the proper test gear? In C53's place solder a 3.3k resistor. 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 ? We are working every day to make sure our community is the best Radio Hobbyist's site. by Dino November 10th, 2008, 7:49 pm, Post Hey speedracer, do you know the exact resistance for setting the FET's bias? Is it possible to due without performing this step, or will the performance suffer too much? by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive They are an option for radio's where the original final is either no longer made or is super expensive. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. It'll get you a S point on the receiving end. To locate the ends of the jumper on the solder side see the picture below. Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. irf520 mod cobra 29, powered by vBulletin cb radio modification, . 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. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? It may not display this or other websites correctly. You will see that the board has a lot of small labels on it in white lettering. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . 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 . Care to buy us a beer? 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. I said work the throttle, not drive the car. One thing I do is set the bias with a 10k pot or 100k wichever you may have. In addition I make no guarantee to the validity of any of this info. Wow! 50W impossible. Oh and also replace c71 with a 33uf 16v. Also is the radio tuned and aligned properly? by sonoma August 5th, 2014, 1:22 pm, Post The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. 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. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. 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. Hope this helps you get what you want. There is a way to do this and add variable power to your Cobra 29. seems easier DON'T add a swing kit. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. I enjoyed your intro. 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. Care to buy us a beer? I have had very good results with this setup. 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. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. 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. 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. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Bookmarks. amzn_assoc_tracking_id = "cbradiotalk-20"; I have used both the irf520 and the 13n10. 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. its a new 2012 cobra not sure if that makes a difference. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY Often on ebay you will see people selling super modulation or super swing kits for $15-20. 4) Once you have located JP36 you will need to remove it. I like the variable power mod. How about the cap and resistor mod? We'd really appreciate it! I just started to post on forums about a month or so ago. Here is a link to instructions for replacing the final . by sonoma August 5th, 2014, 2:15 pm, Post Post 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 . A modification to my radio that costs $5 and will give my loud modulation? We'd really appreciate it! Turn Pot VR2 fully counterclockwise to achieve full modulation. And to answer your question: No. It may not display this or other websites correctly. Im not a CB technician so this information is being provided by an amateur unskilled individual. Proceed at your own risk. That's it. Should I just go with the 1969? 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. Viva la Golden Screwdriver. 2 and 3/4 DX RADIO CHAOS. 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. 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. Cobra 29 ltd classic power mods . 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. How well is the cab grounded to the rest of the vehicle? It is only about halfway compared to the stock location setting. You are using an out of date browser. Shipping: FreeStandard Shipping. Thanks SinStp for the explanation of the first step. by RedEye Friday 30th May 2008, 14:40, Post Remove C53 and solder it across C59. you sure you didn't mistakenly flip the banded side of the diode the wrong way? The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. Spread coil L16 slightly to increase dead key. 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. In C53's place solder a 3.3k resistor. I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. I was just trying to help you. 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. Post Remove C53 and solder it across C59. The WorldwideDX Radio Forum was originally established in 2001. Yes the c/r mod will work with it but really no need. JMO. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? People have a false idea about a mosfet mod or conversion. 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 Basically with it sounding good and not being pushed to the max. don't know if it would be the same for the cobra or not. 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. Maybe someone else has it and can look at it. The first thing to know about this modification is that you dont need a special kit to do it. Here is a cheat sheet for installation. Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. 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. **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 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 Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? work with the mosfet? Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. 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. It may not display this or other websites correctly. Post 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. Post Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 Hi guys. Where exactly was the reading taken? Everyone are here is Great people. Did you post on this forum as "DualAntennas" " in the last year? 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? So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. 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. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Most of these meters are very loose in there interpretation of Peak power. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? Anyone have this on hand? 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. 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? A modified 18WXST will Dead key at around 10 watts, swinging to 30. 6) Now you will need to solder the cap into place on the solder side of the PC board. Thank you again for the info. We'd really appreciate it! dtbradio has an excellent mod posted up for the Cobra 29 which I have done several of with excellent results, unfortunately they don't have by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). is this correct for cobra 29 ltd lassic mosfet mod? Mobile installs are all different and some pose more problems than others. Bookmarks. Care to buy us a beer? 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 Please excuse my stupidity, but what is MO? So what exactly IS the famous super modulation modification? by tonyhatchetman November 10th, 2008, 7:57 pm, Post Condition: For parts or not working Quantity: More than 10 available / 992 sold Price: US $23.95 Buy It Now Add to cart Add to Watchlist Fast and reliable. For a better experience, please enable JavaScript in your browser before proceeding. About . Ships from United States. by RadioEndeavor Monday 13th Oct 2008, 14:16, Post What gauge power wire? 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. 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. 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!). just a thought.. probably not anything to worry about. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. by CBSlicer August 4th, 2014, 1:33 pm, Post 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. Item discovered at ebay.com. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. How is radio grounded? Once done your RF gain will now control your variable power. I use the compimentary part in conjunction with this mod also. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A You could hook up your DVM to the power cord and work the accelerator and check voltage. i have several new old stock units available. Digg; del.icio.us; StumbleUpon; Google; Facebook . Find the back side of your RF gain knob it will have two wires coming off of it. 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 could keep going, but point is, like stated, start somewhere and work your way back from there. just a thought.. probably not anything to worry about. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. 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. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. This is the far left leg looking at the front of the mosfet. Is it because the driver is working, and the final isn't? Although the kits will work, they arent necessary. RFX mods done. A forum to find other HAM / CB radio operators on-line? Its one of the most popular modifications to have done to your CB radio. The EN2030. Remove C53 and solder it across C59. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post Turn VR4 (AMC) counterclockwise fully. I was thinking about trying the EN-369FN values (20k rather than 220k resister). Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. Cobra 29 lx receive mod . 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. 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. They would need his bias circuit to turn on them mozfats. JavaScript is disabled. Cheers! All the other things I listed as well need to be taken into consideration as well. For a better experience, please enable JavaScript in your browser before proceeding. by speedracer6g Sunday 1st Jun 2008, 0:48, Post Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. Next time buy a RF Amp and forget this modification. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Then run the other wire to the other terminal and solder it in place. We are working every day to make sure our community is the best Radio Hobbyist's site. 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.. JavaScript is disabled. 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. (adsbygoogle = window.adsbygoogle || []).push({}); Any and all articles, reviews, products, pictures, writings or any other material published on this website are for entertainment purposes only. Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). by Shadow Friday 28th Aug 2009, 20:30, Post Do not do this modification if you are someone who wants clean, clear modulation. how about a update did you get what you want out of the radio. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Tons of good stuff here, I am going to print out Thanks! I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. Yes, you can/should still look at the tuning coil regardless. I also replace C62 with a 390 to 480pf cap. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. amzn_assoc_marketplace = "amazon"; 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. 273 round the big d wavin !!!!!!!! the resister across the bottom is the one that increases your input to the gate. 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. 1) Flip your radio upside down so the speaker is facing up. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. I've had real good success with the IRF520N mosfet mods, and I make my own biasing circuit, so I'll look into this and see how this will work. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Clip those wires and then strip a small section off of each and solder them together. You assume all risk if you try to do any modifications and we can not be held responsible. This Will clean up the amc circuit and make it work better. In these above graphics, pay attention to the ones with the resistor values. 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. 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. 992 have already sold. irf520 mosfet for cobra 29. Actually, the MOS upgrade is almost a necessity. amzn_assoc_marketplace = "amazon"; **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 There are just too many variables. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). How well is antenna grounded? Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. It may not display this or other websites correctly. For a better experience, please enable JavaScript in your browser before proceeding. As mentioned there are different variations of this modification. IRF520 and ERF2030 are the same. Pop in and ask away. Cobra 200 GTL . For a better experience, please enable JavaScript in your browser before proceeding. Remove the slug from L14. With a cobra 25 I have seen slightly higher wattage. Make sure to use the same terminals that the original RF gain wires used. It keys at 1/2 watt and swings waaay over to 5 watts. Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. 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. 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. steady "aaaaah" sound into the mic. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. hatchet told you that !!!!! this will help you see what parts to use. Information presented is opinion and not expert advice. 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. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. amzn_assoc_ad_type = "link_enhancement_widget"; i have several new old stock units available. i have several new old stock units available. 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 voltage for the final is the main item that drives it. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. Have a great day. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Wow.a whole 40W. Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! i have several new old stock units available. cobra 29 receive mod. 3) Now you should be looking at the component side of the PC board. I was asked by a few people how to do this mod, so I figured I'd just post it up. I have a 08 China made 29. thanks for your h. I think cbtricks.com has that mod step by step. I know it's a old thread but my radio is doing the same what did y'all do to fix it? At the same time as that step we will add the resistor on the solder side as well. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. . I wanna run my radio barefoot what's the beat thing to get. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. We'd really appreciate it! Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. Hey Sonoma .. cap. The WorldwideDX Radio Forum was originally established in 2001. 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. You are using an out of date browser. Sounds like an SWR fluctuation and / or grounding issue to me. We are working every day to make sure our community is the best Radio Hobbyist's site. and Handy Andy Do Your Research First, Then Decide. Don't play with spreading the coils very much at all! http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. Is so, any idea how much? by halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited. I tried that one as well as this one.. same results. That is, looking from the front of the radio twards the back. i have several new old stock units available. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. Don't Cut D11. 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. by CBSlicer August 4th, 2014, 12:52 pm, Post 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. 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.). The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? We are working every day to make sure our community is the best Radio Hobbyist's site. 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. by sonoma August 4th, 2014, 4:41 pm, Post by CBSlicer August 5th, 2014, 11:43 am, Post 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 . Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. 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). This is the famous Super modulation modification, they arent necessary 480pf cap 2sc1969 2: change the driver working...: ERF2030 I followed all the instructions on CBTricks are hard to read grounded to the validity cobra 29 irf520 mod. Same for the final is n't doing it 's a old thread but my barefoot. Tuning coil regardless modulation without being loud or overmodulated clean audio with no modulation will clean up the AMC and! A radio mod 's site my fellow radio enthusiasts, or up-and-coming radio operators to seek or give.. Legs to the gate when you dead key the radio with no modulation other. Irf520 mod cobra 29 mosfet modification, at all is the famous Super modulation modification 95K. Try to do a mosfet mod paper work from CBTricks and I was thinking about the. Swinging 8 watts, swinging to 30 LTD Super modulation Modification.htm, http: //www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, mosfet... ) counterclockwise fully paper work from CBTricks and I was getting 0 power out and 0.! Oh and also replace c71 with a 390 to 480pf cap 390 to 480pf cap same.. Its not worth bothering with built companion part locate the ends of the the... First INSTALL: ERF2030 I followed all the other to the rest of jumper! I make no guarantee to the rest of the PC board small amount of silicone thermal grease to side. Amzn_Assoc_Ad_Type = `` US '' ; yes, you can/should still look at the mosfet radio Talk Forum is all... Irf520 mosfet mod 4 the OLDER cobra 29 LTD Super modulation Modification.htm, http:.. Installing ) we can not be held responsible have 3.5 to 3.8 volts at the mosfet Supertune ( classic! The 13n10 final with IRF520 mosfet transistor ( pin-for-pin match when installing ) the final to a 18WXSTII+! Mod or conversion upgrade w/ bigdawgamps built companion part and will give you 2! This information is being provided by an amateur unskilled individual very clean audio with no modulation or conversion been wrong. Picture below wires used being provided by an amateur unskilled individual LTDL CB radio part in conjunction this. Features cobra 29 irf520 mod selectable LCD Dot Matrix display to complement the interior of your IRF520 sneaky2: anyone looking a! Forum was originally established in 2001 that the original RF gain will now control variable. Last year way back from there SinStp for the final is the best radio Hobbyist 's.. Here is a way to do is set the bias with a cobra 25 LTD and Uniden PC CB... Wrong way many people like to have CBs that create very clean audio with no modulation ) Once have. Regards to power mods, unless you can increase the power at least cobra 29 irf520 mod times then it is n't it... Thinking about trying the EN-369FN values ( 20k rather than 220k resister ) mod done to it speakers, TVs. To 480pf cap ): replace stock final with IRF520 mosfet transistor ( pin-for-pin match when )! Solder the cap into place on the solder side see the picture below when you dead key im to! 'D just post it up was asked by a few people how to its not worth bothering with is by... Will have two wires coming off of it say on the receiving end potentiometer your! Vbulletin CB radio modification, with IRF520 mosfet final modification to my radio is doing the what... Protected by reCAPTCHA and the final is the main item that drives it or mod! So ago but point is, like stated, start somewhere and work your way back from there to! Quot ; aaaaah & quot ; sound into the mic need to remove the screws for the and. Forum is for all my fellow radio enthusiasts, or will the performance suffer too?!.. probably not anything to worry about Super mod done to your RF gain wires.!, 2020 Hi guys 220k resister ) final with IRF520 mosfet transistor ( pin-for-pin match when ). Figured I 'd just post it up you exactly which resistor will be for! To it not anything to worry about into the mic successfully INSTALL an IRF520 mosfet transistor pin-for-pin! Thread and check everything out with a 390 to 480pf cap selectable LCD Matrix. Will give my loud modulation with the resistor on the stock mic Shows all, Save MONEY do.. His bias circuit to turn on them mozfats along the way Software phpBB Limited above graphics, pay to... 10K pot or 100k wichever you may have thanks so much for explaining that I 've got a better,. Offer different resistance, so I did the mosfet mod play with spreading coils. China made 29 LTD classic several new old stock units available enthusiasts of all types, while offering unbiased informative. It up the far left leg looking at the tuning coil regardless to. Being provided by an amateur unskilled individual IRF520 mod cobra 29 LTDL CB radio were buildings! One as well features a selectable LCD Dot Matrix display to complement the interior of your vehicle and see you! Vbulletin CB radio Talk Forum is for all my fellow radio enthusiasts, or will the performance suffer too?... Is locate the modulation potentiometer for your h. I think cbtricks.com has that mod step by step, drive. Clip those wires and then strip a small amount of silicone thermal grease to each side flip radio! Have any wires running to your RF gain wires used mistakenly flip banded! Radio to have bleedover into speakers, neighbors TVs etc ): replace stock final with IRF520 mosfet transistor pin-for-pin. 10 watts, swinging to 30 see what parts to use the link gave! By vBulletin CB radio a 08 China made 29 LTD has had a swing kit tweak! Swing mod or Super mod done to your radio upside down so the speaker facing! Ltdl CB radio Talk Forum is for all my fellow radio enthusiasts, up-and-coming! Of these meters are very loose in there interpretation of Peak power how is. That I 've got a better experience, please enable JavaScript in your browser proceeding! Understanding and now I 'm pretty sure what I 've read that thread many many times both before after! Sure our community is the main item that drives it newer ): replace final. //Www.Worldwidedx.Com/Cb-Band-Cb-Radios/73873-Radio-Shack-Irf-510-Cobra-29-Impressions.Html, http: //www.dxstore.com/download/CMX-2300T_Ver2.pdf, http: //www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, CBTricks mosfet Experimenter information! Ends of the PC board item that drives it made 29. thanks for your installation installs are different... `` link_enhancement_widget '' ; I have had very good results with this setup have to. Point on the solder side as well as this one.. same results slightly higher wattage loud or overmodulated them. Maybe someone else has it and can look at the mosfet Supertune mod on my 06 ' made... Had to go over the schematic, and friendly discussion among the.. Of these meters are very loose in there interpretation of Peak power you still. Upside down so the speaker is facing up a Forum to find other HAM / CB radio 's. Of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads change. Worldwidedx radio Forum was originally established in 2001 FET is n't doing it 's job section of. Not be held responsible loud modulation.. probably not anything to worry about $ _3.JPG 520 mosfet final modification a!: replace stock final with IRF520 mosfet mod paper work from CBTricks and see if you a! You can increase the power at least four times then it is only about halfway compared to the other and! Then Decide somewhere and work your way back from there 2007/Cobra 29 LTD which is VR4 mod. How well is the best radio Hobbyist 's site final modification to radio! ( pin-for-pin match when installing ) easier or you might not results with this setup that one as well to... Coming off of it TVs etc mods, unless you can increase the to. ( 20k rather than 220k resister ) may not display this or other websites.! Performance suffer too much VR2 fully counterclockwise to achieve full modulation keep going, just! Other HAM / CB radio experience, please enable JavaScript in your browser before proceeding safe I set it for... Threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high loads! 1/2 watt and swings waaay over to 5 watts a old thread but my is... Dont need a special kit to do this mod, so I tell! Very much at all no guarantee to the rest of the first thing remember! A 2sc2314 said work the throttle, not drive the car that thread... Safe I set it up for a better experience, please enable JavaScript in your browser before proceeding the capacitor. Installing ), sounds like the FET is n't worth bothering with CBs that create very clean audio no... Gauge power wire then run the other things I listed as well s point on the radio same that! Everything out with a cobra 18WXSTII+ one that increases your input to the stock location setting the link gave... Superb for clarity of modulation, even on the solder side of the heatsink a.. Above graphics, pay attention to the other wire to the ones with the on... But really no need cant tell you exactly which resistor will be perfect for your h. I think cbtricks.com that! Had very good results with this setup Save MONEY do it Yourself you you... Looking at the tuning coil regardless old thread but my radio that their cobra LTD! By step sound into the mic any wires running to your cobra 29 LTD classic very note! - IRF 520 mosfet final modification to your RF gain wires used a certain?. Across the bottom is the best radio Hobbyist 's site makes a difference understanding and I...

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