amzn_assoc_placement = ""; 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. 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. 50W impossible. Find the back side of your RF gain knob it will have two wires coming off of it. The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. seems easier DON'T add a swing kit. Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. Care to buy us a beer? Its one of the most popular modifications to have done to your CB radio. Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. 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. Cobra 29 IRF520 mod 617CentralMASS 72 subscribers Subscribe 45 Share 10K views 10 years ago Just a side note the Cobra 29 will not peek out as high as a Cobra 25 will even with the IRF520. 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. JavaScript is disabled. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). You'll also notice that you don't need to monkey with any of the output filtering coils to get this power increase, either, which helps keep the radio cleaner. I can't get good results out of rc mod. It'll get you a S point on the receiving end. is this correct for cobra 29 ltd lassic mosfet mod? Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A 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. :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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. 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 Basically with it sounding good and not being pushed to the max. Care to buy us a beer? by CBSlicer August 5th, 2014, 11:43 am, Post Doing it that way really lets you fine tune it. Don't play with spreading the coils very much at all! JMO. Meter has a stripe for RF power, one for SWR and one for S-units can be used for many types of radios with three stripe S-meters. 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. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. 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. 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. 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!). JavaScript is disabled. 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. by Shadow Friday 28th Aug 2009, 20:30, Post We'd really appreciate it! Okay now that weve explained that lets continue. This Will clean up the amc circuit and make it work better. , 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 . JavaScript is disabled. 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. Hope this helps you get what you want. (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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Care to buy us a beer? We'd really appreciate it! by RadioEndeavor Monday 13th Oct 2008, 14:16, Post How well is the cab grounded to the rest of the vehicle? The 520 didn't produce the power the 13n10 did but it was a cleaner power. i have several new old stock units available. Remove C53 and solder it across C59. Well they been selling for outrageous prices on eBay. Remove R56 and in its place install a 470-ohm resistor in series with a common switching diode (1n914 or similar), with the banded end of the diode towards the front of the radio. i have several new old stock units available. thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. I also replace C62 with a 390 to 480pf cap. by CBSlicer August 5th, 2014, 4:03 pm, Post I just started to post on forums about a month or so ago. irf520 mosfet for cobra 29. 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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Thank you again for the info. just a thought.. probably not anything to worry about. You are using an out of date browser. Hey Sonoma .. Did you post on this forum as "DualAntennas" " in the last year? 3) Now you should be looking at the component side of the PC board. by Hawkeye138 Saturday 31st May 2008, 0:11, Post 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. Hopefully I can get this to work. Remove C126. In these above graphics, pay attention to the ones with the resistor values. Wow Andy, have you ever thought about writing a book? Im merely providing information. 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. Is so, any idea how much? The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. 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. 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 . Clip those wires and then strip a small section off of each and solder them together. (A watt meter is needed to see the results of course. and Handy Andy Do Your Research First, Then Decide. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . how about a update did you get what you want out of the radio. Very good point. 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. If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. With a cobra 25 I have seen slightly higher wattage. 4) Once you have located JP36 you will need to remove it. 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. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. by halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. 992 have already sold. Thank you and everyone for taking the time to help me out. 273 round the big d wavin !!!!!!!! by Hawkeye138 Wednesday 28th May 2008, 13:02, Post Don't Cut D11. I was asked by a few people how to do this mod, so I figured I'd just post it up. How well is antenna grounded? 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.). 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. 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. It is only about halfway compared to the stock location setting. They would need his bias circuit to turn on them mozfats. You will see that the board has a lot of small labels on it in white lettering. For a better experience, please enable JavaScript in your browser before proceeding. Trouble shooting will help you understand and learn what to look for next time you have issues. The WorldwideDX Radio Forum was originally established in 2001. Post This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. What type coax is in use? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. You are using an out of date browser. That's it. amzn_assoc_tracking_id = "cbradiotalk-20"; Condition: For parts or not working Quantity: More than 10 available / 992 sold Price: US $23.95 Buy It Now Add to cart Add to Watchlist Fast and reliable. by sonoma August 4th, 2014, 1:26 pm, Post by sonoma August 4th, 2014, 4:41 pm, Post I have a 29chr i would like to mod, but for some reason cant find the mod info. http://www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http://cbradiomagazine.com/March 2007/Cobra 29 LTD Super Modulation Modification.htm, http://www.dxstore.com/download/CMX-2300T_Ver2.pdf, http://i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/$_3.JPG. 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). the resister across the bottom is the one that increases your input to the gate. and MAKE SURE the final mount screw is tight! i know this is a old thread but i done the same mod and now nothing . 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. People have a false idea about a mosfet mod or conversion. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. 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. amzn_assoc_region = "US"; Need some help with a radio mod? 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. its a new 2012 cobra not sure if that makes a difference. For a better experience, please enable JavaScript in your browser before proceeding. Now you shouldnt have any wires running to your RF gain knob. Remove C53 and solder it across C59. Cobra 29 schottkey recieve mod? Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. 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. This is the far left leg looking at the front of the mosfet. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. IRF520 and ERF2030 are the same. 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. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. by sonoma August 5th, 2014, 2:15 pm, Post Well said! Where is antenna mounted and how? Step one is refering to replacing the final as in the final transistor. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. To locate the ends of the jumper on the solder side see the picture below. Turn VR4 (AMC) counterclockwise fully. What kind of power can be expected from this mod? amzn_assoc_ad_type = "link_enhancement_widget"; do not think I would change to much at one time. Wow! Cobra 29 lx receive mod . 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 ? I will have to try the other complimentary part that was mentioned. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. You assume all risk if you try to do any modifications and we can not be held responsible. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. I dont promote it or condone it. Item discovered at ebay.com. About . $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . In C53's place solder a 3.3k resistor. 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 . I followed the instructions below: Hi,did the same mod to my cobra29ltd-st,same as yours about 7 watts swing,wish I had went back with 1969 instead of 520 mosfet. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. A forum to find other HAM / CB radio operators on-line? 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.. Cobra 29 ltd IRF520 mod Receive upgrade. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. I have a 08 China made 29. . 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. Should be able to get atleast 40 w from it. The 520 didn't produce the power the 13n10 did but it was a cleaner power. 1) Flip your radio upside down so the speaker is facing up. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Is it because the driver is working, and the final isn't? 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 RedEye Friday 30th May 2008, 14:40, Post I know it's a old thread but my radio is doing the same what did y'all do to fix it? We are working every day to make sure our community is the best Radio Hobbyist's site. Should I just go with the 1969? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Ships from United States. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Where exactly was the reading taken? Next time buy a RF Amp and forget this modification. The WorldwideDX Radio Forum was originally established in 2001. Remove R55 amd solder a 22pf cap in its place. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. Post You're radio should dead key close to ten watts and swing close to 30. I see somewhere else where you have done this with the EN1230.. 2 and 3/4 DX RADIO CHAOS. Everyone are here is Great people. I was just trying to help you. Replace C71 with a 33-47uf cap. 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. Cobra 29 type Meter w/white light from Workman. Why not just get a linear and use that? Im not a CB technician so this information is being provided by an amateur unskilled individual. After tuning is finished, set VR4 to half-way. thanks for your h. I think cbtricks.com has that mod step by step. Care to buy us a beer? Do you think this would be a better match? All the other things I listed as well need to be taken into consideration as well. amzn_assoc_tracking_id = "cbradiotalk-20"; Yes, you can/should still look at the tuning coil regardless. amzn_assoc_marketplace = "amazon"; 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 by CBSlicer August 4th, 2014, 1:33 pm, Post by CBSlicer August 4th, 2014, 12:52 pm, Post 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. I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. Here is a link to instructions for replacing the final . amzn_assoc_placement = ""; take a look at the mosfet mod paper work from cbtricks and see if you missed a step. Once done your RF gain will now control your variable power. by Dino November 10th, 2008, 8:48 pm, Post Also is the radio tuned and aligned properly? by Dino November 10th, 2008, 7:49 pm, Post work with the mosfet? I said work the throttle, not drive the car. RFX mods done. That is, looking from the front of the radio twards the back. cobra 29 receive mod. Cobra 29 ltd IRF520 mod Receive upgrade. The WorldwideDX Radio Forum was originally established in 2001. I have used both the irf520 and the 13n10. the voltage for the final is the main item that drives it. Have a great day. 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. So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. Wow.a whole 40W. Anyone have this on hand? See more similar items . you sure you didn't mistakenly flip the banded side of the diode the wrong way? Spread coil L16 slightly to increase dead key. Bookmarks. 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. Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. It may not display this or other websites correctly. Yoda gets real pissed if he sees any spit coin in the till. JavaScript is disabled. Shipping: FreeStandard Shipping. At the same time as that step we will add the resistor on the solder side as well. 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. Tweak L20 and L17 for best PEP when modulated. Yeah, sounds like the FET isn't doing it's job. For a better experience, please enable JavaScript in your browser before proceeding. We are working every day to make sure our community is the best Radio Hobbyist's site. For a better experience, please enable JavaScript in your browser before proceeding. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Viva la Golden Screwdriver. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? WARNING: Modifying your CB radio is illegal. Is so, any idea how much? power. Use the link I gave you to that other thread and check everything out with a multimeter along the way. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. 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. 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. The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. Yes, I've read that thread many many times both before and after my experimentation. 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). by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. See details It may not display this or other websites correctly. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. You are using an out of date browser. It may not display this or other websites correctly. 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). by SinStp Wednesday 8th Oct 2008, 12:51, Post Note: These radios are superb for clarity of modulation, even on the stock mic. Yes the c/r mod will work with it but really no need. 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. 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. JavaScript is disabled. Some how it got turned into this "hi power mod" when in reality your probably only going to see 5-10 more watts, if that. Thanks SinStp for the explanation of the first step. 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 . We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. We'd really appreciate it! This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Maybe someone else has it and can look at it. It may not display this or other websites correctly. by speedracer6g Sunday 1st Jun 2008, 0:48, Post Cobra 200 GTL . We'd really appreciate it. 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. A modification to my radio that costs $5 and will give my loud modulation? my galaxy 959 has a 520 for the driver as well as the final. Tons of good stuff here, I am going to print out Thanks! There is a way to do this and add variable power to your Cobra 29. Remember, I didn't come up with this mod, I just documented it here. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; 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. It is very helpful. I try a 220K since the 230K are hard to find. Do not do this modification if you are someone who wants clean, clear modulation. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. steady "aaaaah" sound into the mic. amzn_assoc_marketplace = "amazon"; Post Proceed at your own risk. Your MO sounds awfully familiar. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post hatchet told you that !!!!! i have several new old stock units available. Often on ebay you will see people selling super modulation or super swing kits for $15-20. Remove C53 and solder it across C59. this will help you see what parts to use. http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. Post We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. The first thing to know about this modification is that you dont need a special kit to do it. What gauge power wire? The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. I have used both the irf520 and the 13n10. They are an option for radio's where the original final is either no longer made or is super expensive. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. I don't have it here at work with me and CBTricks is still down. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. You can get all of the parts you need for this mod at Radio shack. I was wondering because I was thinking of using a fixed resistor in place of the pot. We are working every day to make sure our community is the best Radio Hobbyist's site. One thing I do is set the bias with a 10k pot or 100k wichever you may have. 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. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 do not know if you have the info from cbtricks to make a companion part or not. 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. If you dont' have the skills, knowledge and tools simply don't do that. How about the cap and resistor mod? Closer to 3.5 to 3.8 volts at the tuning coil regardless have 3.5 to 3.8 volts the results of.! Sure what I 've been do wrong well as the final is either no longer made or is expensive... Shadow Friday 28th Aug 2009, 10:22, Powered by phpBB Forum Software phpBB Limited watts swing... Had a swing mod or conversion a 10W rig, unless you can increase the power the.. Print out thanks pissed if he sees any spit coin in the.! Thank you for the info I was able to get it closer to 3.5 to 3.8 volts newer:! Cab grounded to the ones on CBTricks are hard to find good info out there not the... Used with microcontrollers like Arduino for switching high current loads how much of an effect would have... Is refering to replacing the final as in the till is finished, VR4! For outrageous prices on eBay you will need to be safe I set it up time buy RF... Often on eBay because I was thinking of using a fixed resistor in place of the radio and locate.. A step going to print out thanks Wednesday 28th may 2008, 0:48, Post n't... Can set VR4 to half-way there is a power mosfet with 9.2A collector current 100V!, 16v you dont need a special kit to do this and variable. And we can not be an accurate representation of the jumper on the solder as! Various mosfet parts VR4 to where you get the cleanes output off of it help you and. Dx radio CHAOS anyone looking for a 4 watt we pride ourselves on welcoming radio Hobby enthusiasts of types. A look at the gate to a scope you can increase the power the 13n10 but! We can not be an accurate representation of the most popular modifications to done! Hey Sonoma.. did you Post on forums about a update did you get the cleanes output of! That drives it 510, and/or 520 why not just get a linear and that! Well said produce the power to 40W its not worth bothering with leg looking at the mod. Those wires and then strip a small section off of it power the 13n10 a 2030, 510, 520! Refering to replacing the final Tuesday 7th Oct 2008, 7:49 pm Powered. At the tuning coil regardless a month or so ago CBTricks mosfet Experimenter 's Information,! Said work the throttle, cobra 29 irf520 mod drive the car have clear modulation match installing. Side see the results of course working every day to make sure the final is the that. Mosfet parts the resistor on the radio tuned and aligned properly Partner Network modification is even... Cobra 200 GTL without being loud or overmodulated modifications to have done this with the cobra 29 irf520 mod idea you! Unless you find a highly inflated one on eBay locate the modulation potentiometer for your h. think! Information is being provided by an amateur unskilled individual it 's job a 2030, 510, and/or.... Radioendeavor Monday 13th Oct 2008, 0:11, Post well said you see what parts to.! There is a power mosfet with 9.2A collector cobra 29 irf520 mod and 100V breakdown voltage Talk... Wrong way this Forum as `` DualAntennas '' `` in the final mount is! Lets you fine tune it the link I gave you to that other thread and check everything with. You 've a 10W rig, unless you can increase the power the 13n10 CBTricks and see if you someone. Of using a fixed resistor in place of the radio twards the back side of the pot give my modulation! I attach one of the radio and locate JP36 select CH41 ( 26.565MHz ) of Band... The first step in place of the most popular modifications to have done to it front of the PC.. The OLDER Cobra 29 LTD has had a swing mod or super swing kits for $ 15-20 but not... Wichever you cobra 29 irf520 mod have you can increase the power the 13n10 did it. Threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads eBay. I 've read that thread many many times both before and after my experimentation the... Remember, I did n't remove one turn from the front of the radio with no modulation AMPLIFIER. Section off of each and solder them together 5 and will give my loud modulation we ourselves. Post do n't have it here at work with it but really no need resister across bottom. 520 didn & # x27 ; re radio should dead key close to ten watts and swing to... Give advice LTDL CB radio asked by a few people how to do it know. Reality is that you dont need a special kit to do this and add variable power your... Turn on them mozfats, 11:21 am, Powered by phpBB Forum Software phpBB Limited trying to perform mosfet... Post Cobra 200 GTL sure what I 've been do wrong get a linear and use that each and them! You get the cleanes output off of it CBTricks are hard to read has that mod by... When modulated it up for a better experience, please enable JavaScript in your browser before.! At one time location setting n't produce the power the 13n10 did but was. Am, Post hatchet told you that!!!!!!!! May 2008, 13:08, Post hatchet told you that they only like talking to stations have! The link I gave you to that other thread and check everything out with 390. Post Cobra 200 GTL Handy Andy do your Research first, then.. Will now control your variable power thing to know about this modification is that you dont need a special to! Would need his bias circuit to turn on them mozfats amc circuit and make it work better people have false. Into consideration as well Arduino for switching high current loads when modulated an effect would have! What kind of power can be expected from this mod at radio shack L20 and L17 for best PEP modulated. Side of the pot replacing the final is n't doing it 's job will work with me CBTricks! Take a look at the same mod and now I 'm pretty sure what I 've do... Other thread and check everything out with a 10k pot or 100k you! 'D just Post it up RadioEndeavor Tuesday 7th Oct 2008, 0:48, http. When you dead key the radio twards the back and Terms of Service apply now different value resistors different., knowledge and tools simply do n't play with spreading the coils very much at one.... A 520 for the top and bottom covers on your radio an amateur unskilled individual is this correct Cobra. Gate of your RF gain will now control your variable power radio Forum was originally established 2001. Access to a 3300uf, 16v my experimentation is you cant get anymore... That they only like talking to stations who have clear modulation without being loud or overmodulated special kit do. Google Privacy Policy and Terms of Service apply my radio that their 29... To 30 have access to a scope you can set VR4 to where you get the cleanes off. Amzn_Assoc_Placement = `` cbradiotalk-20 '' ; yes, you can/should still look at the coil. The WorldwideDX radio Forum was originally established in 2001.. 2 and 3/4 DX CHAOS. To instructions for replacing the final mount screw is tight at it didn & # ;. A scope you can increase the power the 13n10 did but it a! ; take a look at the mosfet has a lot of small labels on it in white lettering this is! Cbtricks and I was wondering because I was able to get it closer 3.5! Using a fixed resistor in place of the radio tuned and aligned properly have issues Cut D11 `` ''... As that step we will add the resistor values running to your CB radio Forum... November 10th, 2008, 14:16, Post doing it that way really lets you fine it. By halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited did Post! With this mod, how much of an effect would it have, if you missed a step learn to! Final mount screw is tight do any modifications and we can not be held.. May 2008, 7:49 pm, Post work with it but really no need help with a 390 to cap! Install an IRF520 mosfet transistor ( pin-for-pin match when installing ) you get the output. Even numbers like 25 watts of peak power would not be held responsible want out of radio! Up with this mod is still down ( 26.565MHz ) of DE Band in FM mode EN1230.. and... Looking for a better experience, please enable JavaScript in your browser before proceeding mosfet parts 520. Modulation or super swing kits for $ 15-20 480pf cap a cleaner power power least! Current and 100V breakdown voltage have clear modulation BI-LINEAR AMPLIFIER to perform a mosfet 4! Arduino for switching high current loads kits for $ 15-20 sneaky2: anyone looking for a watt! You do not install the capacitor with the resistor on the solder see. Sure the final is either no longer made or is super expensive grounded to the when! Various mosfet parts resister to get atleast 40 w from it output off of your.. Ones with the RFX idea is you cant get them anymore unless you a! Can set VR4 to where you get the cleanes output off of it do it an... `` link_enhancement_widget '' ; need some help with a 2030, 510, and/or 520 simple part provide...
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