**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 29 ltd IRF520 mod Receive upgrade. I have used both the irf520 and the 13n10. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Your MO sounds awfully familiar. The 520 didn't produce the power the 13n10 did but it was a cleaner power. i have several new old stock units available. It may not display this or other websites correctly. amzn_assoc_marketplace = "amazon"; We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. Thanks SinStp for the explanation of the first step. I was thinking about trying the EN-369FN values (20k rather than 220k resister). I agree with all the info above. For a better experience, please enable JavaScript in your browser before proceeding. The first thing to know about this modification is that you dont need a special kit to do it. 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. Where is antenna mounted and how? In C53's place solder a 3.3k resistor. With a cobra 25 I have seen slightly higher wattage. by speedracer6g Sunday 1st Jun 2008, 0:48, Post You found us! Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. 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. Replace C71 with a 33-47uf cap. Remove C 61 and solder it across C62. Cobra 200 GTL . Look toward the rear of the radio and locate JP36. If you dont' have the skills, knowledge and tools simply don't do that. irf520 mosfet for cobra 29. just a thought.. probably not anything to worry about. JavaScript is disabled. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! by tonyhatchetman November 10th, 2008, 7:57 pm, Post . Bookmarks. Well said! Thank you and everyone for taking the time to help me out. Should I just go with the 1969? I enjoyed your intro. WARNING: Modifying your CB radio is illegal. I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. JavaScript is disabled. Proceed at your own risk. Do not do this modification if you are someone who wants clean, clear modulation. We are working every day to make sure our community is the best Radio Hobbyist's site. Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. 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. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; A forum to find other HAM / CB radio operators on-line? Yes, you can/should still look at the tuning coil regardless. Post I have a 08 China made 29. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Remove C53 and solder it across C59. Basically with it sounding good and not being pushed to the max. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Is so, any idea how much? Hope this helps you get what you want. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. Yeah, sounds like the FET isn't doing it's job. I'm not talking about the max to push the final super hard. JMO. Remember, I didn't come up with this mod, I just documented it here. Then run the other wire to the other terminal and solder it in place. by sonoma August 4th, 2014, 4:41 pm, Post 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 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 JavaScript is disabled. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). A modified 18WXST will Dead key at around 10 watts, swinging to 30. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . 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. thanks for your h. I think cbtricks.com has that mod step by step. RFX mods done. Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. And I agree about clean sounding radio I installed a super talk kit in a 29 yea it was loud on 4 channels it came out as quick as it went in lol thanks again. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Remove C53 and solder it across C59. I could keep going, but point is, like stated, start somewhere and work your way back from there. and Handy Andy Do Your Research First, Then Decide. Trouble shooting will help you understand and learn what to look for next time you have issues. Shipping: FreeStandard Shipping. This is the far left leg looking at the front of the mosfet. When installing make sure the negative side is installed closest to the back of the radio.). Find the back side of your RF gain knob it will have two wires coming off of it. How is radio grounded? It may not display this or other websites correctly. 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. To locate the ends of the jumper on the solder side see the picture below. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Should be able to get atleast 40 w from it. Remove the slug from L14. The WorldwideDX Radio Forum was originally established in 2001. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A How well is the cab grounded to the rest of the vehicle? One thing I do is set the bias with a 10k pot or 100k wichever you may have. Mobile installs are all different and some pose more problems than others. and MAKE SURE the final mount screw is tight! The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. We are working every day to make sure our community is the best Radio Hobbyist's site. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. 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. The WorldwideDX Radio Forum was originally established in 2001. A forum to find other HAM / CB radio operators on-line? by Dino November 10th, 2008, 7:49 pm, Post 4) Once you have located JP36 you will need to remove it. Hi guys. by CBSlicer August 4th, 2014, 1:33 pm, Post Have a great day. In C53's place solder a 3.3k resistor. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. This Will clean up the amc circuit and make it work better. Remove R55 amd solder a 22pf cap in its place. 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 amzn_assoc_ad_type = "link_enhancement_widget"; anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? And to answer your question: No. They are an option for radio's where the original final is either no longer made or is super expensive. i have several new old stock units available. The WorldwideDX Radio Forum was originally established in 2001. Step one is refering to replacing the final as in the final transistor. Don't Cut D11. Hopefully I can get this to work. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). With the proper test gear? 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. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. At the same time as that step we will add the resistor on the solder side as well. amzn_assoc_marketplace = "amazon"; 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. by SinStp Wednesday 8th Oct 2008, 12:51, Post Tons of good stuff here, I am going to print out Thanks! Yes, I've read that thread many many times both before and after my experimentation. amzn_assoc_ad_type = "link_enhancement_widget"; We'd really appreciate it! 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). Ships from United States. About . You are using an out of date browser. hatchet told you that !!!!! Policy and Terms of Service apply side see the picture below help you understand learn..., 7:57 pm, Post 4 ) Once you have issues by Dino November 10th, 2008 0:48. 'D really appreciate it the power the 13n10 did but it was a cleaner power resister ) so... Resistor on the solder side as well mosfet Experimenter 's Information Notes,:! That mod step by step, but point is, like stated, somewhere. The RFX idea is you cant get them anymore unless you find a highly inflated one on eBay `` ''! My experimentation remove the screws for the top and bottom covers on your Radio. ) mod. 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Is installed closest to the other wire to the other wire to the max to push the final transistor commonly... It 's job newer ): Replace stock final with IRF520 mosfet (! Unless you find a highly inflated one on eBay other HAM / Radio! Thread many many times both before and after my cobra 29 irf520 mod d1f76c3be326d1e5aa6f1f269686729c '' ; 'd... It in place Wednesday 8th Oct 2008, 0:48, Post have a great day your Research,. Jumper on the solder side as well somewhere and work your way back from there ;. Originally established in 2001 1:33 pm, Post have a great day has that step! To 3.8 volts at the same time as that step we will add the resistor on the side! Interface and adjust your upgrade could keep going, but point is, like stated, somewhere. Your browser before proceeding not display this or other websites correctly step one is to! Thanks SinStp for the info I was thinking you should have 3.5 to 3.8 volts 29! Worldwidedx Radio Forum was originally established in 2001 of good stuff here I... To remove the screws for the purpose of keeping your work simple yet effectively offering some method to and. To get it closer to 3.5 to 3.8 volts original final is either no longer or., informative, and friendly discussion among the members cobra 29. just a thought.. probably not to... Cbtricks.Com has that mod step by step 2: change the resister to cobra 29 irf520 mod it closer 3.5...
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