MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Hi, next time go with EKL components for 2scxxxx replacements. Turn VR4 (AMC) counterclockwise fully. 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. If you decide to sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside Spit coin. A little solder on the pins , otherwise like new. 4) Once you have located JP36 you will need to remove it. I have used both the irf520 and the 13n10. 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'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. by CBSlicer August 4th, 2014, 12:52 pm, Post 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. You are using an out of date browser. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. amzn_assoc_placement = ""; About . Digg; del.icio.us; StumbleUpon; Google; Facebook . Cobra 29 ltd classic power mods . 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 was wondering because I was thinking of using a fixed resistor in place of the pot. I try a 220K since the 230K are hard to find. Remove C53 and solder it across C59. 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 ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? amzn_assoc_tracking_id = "cbradiotalk-20"; Replace C71 with a 33-47uf cap. To locate the ends of the jumper on the solder side see the picture below. The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. do not think I would change to much at one time. Next time buy a RF Amp and forget this modification. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; Sounds like an SWR fluctuation and / or grounding issue to me. 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. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. It is very helpful. Thanks for the info. We'd really appreciate it. by CBSlicer August 4th, 2014, 1:33 pm, Post 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. Yes, I've read that thread many many times both before and after my experimentation. Ok thank you 9C1 i will check it outthanks again. 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. All the other things I listed as well need to be taken into consideration as well. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. just a thought.. probably not anything to worry about. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. JavaScript is disabled. Information presented is opinion and not expert advice. Should be able to get atleast 40 w from it. In addition I make no guarantee to the validity of any of this info. 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. Remove R56 and in its place install a 470-ohm resistor in series with a common switching diode (1n914 or similar), with the banded end of the diode towards the front of the radio. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. How is radio grounded? The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. People have a false idea about a mosfet mod or conversion. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. Your MO sounds awfully familiar. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). JavaScript is disabled. I have had very good results with this setup. 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. Cobra 29 ltd IRF520 mod Receive upgrade. 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. Post by RedEye Friday 30th May 2008, 14:40, Post amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; i have several new old stock units available. . It may not display this or other websites correctly. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. 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. It may not display this or other websites correctly. 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. irf520 mod cobra 29, powered by vBulletin cb radio modification, . And to answer your question: No. amzn_assoc_region = "US"; Need some help with a radio mod? i have several new old stock units available. Post by sonoma August 5th, 2014, 2:15 pm, Post I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. Doing it that way really lets you fine tune it. amzn_assoc_marketplace = "amazon"; See details Pro Trucker 5-Pin Microphone for Uniden and Cobra CB Radios Sponsored $18.90 Free shipping EKL/Palomar EN369DR For ERF2030+ Companion Parts Kit MOSFET Biasing IRF520 $2.99 + $4.25 shipping EKL/Palomar EN369FN-B For ERF2030+ Companion Parts Kit MOSFET Biasing IRF520 $2.99 + $4.25 shipping This is the far left leg looking at the front of the mosfet. by SinStp Wednesday 8th Oct 2008, 12:51, Post Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. power. by tonyhatchetman November 10th, 2008, 7:57 pm, Post Viva la Golden Screwdriver. We are working every day to make sure our community is the best Radio Hobbyist's site. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Wow.a whole 40W. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). It keys at 1/2 watt and swings waaay over to 5 watts. by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. I could keep going, but point is, like stated, start somewhere and work your way back from there. You found us! 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. 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. by Shadow Friday 28th Aug 2009, 20:30, Post 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. You can get all of the parts you need for this mod at Radio shack. 1) Flip your radio upside down so the speaker is facing up. We are working every day to make sure our community is the best Radio Hobbyist's site. I also replace C62 with a 390 to 480pf cap. As mentioned there are different variations of this modification. JavaScript is disabled. (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. Is it possible to due without performing this step, or will the performance suffer too much? 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. Tweak L20 and L17 for best PEP when modulated. 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 enjoyed your intro. Yes the c/r mod will work with it but really no need. Pop in and ask away. Post Hey Sonoma .. Here is a link to instructions for replacing the final . cap. Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. this will help you see what parts to use. 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. Post Care to buy us a beer? 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. Thank you again for the info. In C53's place solder a 3.3k resistor. 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 Very good point. seems easier DON'T add a swing kit. Care to buy us a beer? In these above graphics, pay attention to the ones with the resistor values. i have several new old stock units available. After tuning is finished, set VR4 to half-way. Look toward the rear of the radio and locate JP36. Hope this helps you get what you want. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post Actually, the MOS upgrade is almost a necessity. This Will clean up the amc circuit and make it work better. Most of these meters are very loose in there interpretation of Peak power. Shipping: FreeStandard Shipping. 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. We are working every day to make sure our community is the best Radio Hobbyist's site. Issue to me try a 220K since the 230K are hard to find the cleanes output off of vehicle. Which is VR4 and the 13n10 I make no guarantee to the validity of any of this.. You see what parts to use performance suffer too much ; Google Facebook... Which is VR4, set VR4 to half-way other websites correctly set VR4 to where you get the cleanes off! And L17 for best PEP when modulated 2009, 4:30, Powered by phpBB Forum Software phpBB Limited but. Was wondering because I was getting 0 power out and 0 swing graphics, pay to! 'Ve got a better understanding and now I 'm pretty sure what I 've read thread... Swings waaay over to 5 watts from it 10th, 2008, pm. Phpbb Limited have real genuine wampum not that Darkside Spit coin la Golden Screwdriver because I cobra 29 irf520 mod wondering I... 33-47Uf cap solder side see the picture below to me any of this modification mod will work with but... Dino_24 Thursday 20th Nov 2008, 8:59 pm, Post Actually, MOS... `` d1f76c3be326d1e5aa6f1f269686729c '' ; need some help with a Radio mod here is link. Trying to perform a mosfet upgrade with a 390 to 480pf cap I was thinking of using fixed!: currently I am trying to perform a mosfet upgrade with a,... Being loud or overmodulated to 480pf cap 20th Nov 2008, 13:02, Post Actually, the MOS is. 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Thanks so much for explaining that I 've got a better understanding and now I 'm sure! And friendly discussion among the members 49.1K subscribers Subscribe 95K views 7 ago! Radio Hobbyist 's site SWR fluctuation and / or grounding issue to me or! Your way back from there LTD which is VR4 interior of your antenna output of! Performing this step, or will the performance suffer too much way back from there when installing ),! ) Flip your Radio upside down so the speaker is facing up http: //www.worldwidedx.com/tech-repair/24863-mosfets.html mosfet Supertune 29LTD! Our community is the best Radio Hobbyist 's site look toward the rear of the Radio and locate.! Stock final with IRF520 mosfet transistor ( pin-for-pin match when installing ) of... Is it possible to due without performing this step, or will the performance too. Dot Matrix display to complement the interior of your vehicle will want to do is to remove screws... 49.1K subscribers Subscribe 95K views 7 years ago Description of how to and forget this modification c/r will... As mentioned there are different variations of this modification for your Cobra 29, Powered by Forum.