273 round the big d wavin !!!!!!!! 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 For a better experience, please enable JavaScript in your browser before proceeding. 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 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. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Replace C71 with a 33-47uf cap. 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. 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. How about the cap and resistor mod? This site is protected by reCAPTCHA and the Google. http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. Cobra 29 lx receive mod . Now I'm having trouble pulling a good swing pep beyond 7 watts. JavaScript is disabled. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. Please excuse my stupidity, but what is MO? Viva la Golden Screwdriver. 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 5th, 2014, 1:32 pm, Post 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. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. Thank you and everyone for taking the time to help me out. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. is this correct for cobra 29 ltd lassic mosfet mod? See more similar items . 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. If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. amzn_assoc_ad_type = "link_enhancement_widget"; 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 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). A forum to find other HAM / CB radio operators on-line? by Hawkeye138 Saturday 31st May 2008, 0:11, Post This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. 1) Flip your radio upside down so the speaker is facing up. I dont promote it or condone it. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. Here is a link to instructions for replacing the final . Hopefully I can get this to work. At the same time as that step we will add the resistor on the solder side as well. by sonoma August 4th, 2014, 4:41 pm, Post 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 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 keys at 1/2 watt and swings waaay over to 5 watts. 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. For a better experience, please enable JavaScript in your browser before proceeding. by CBSlicer August 4th, 2014, 1:33 pm, Post my galaxy 959 has a 520 for the driver as well as the final. It may not display this or other websites correctly. JavaScript is disabled. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Post irf520 cb, irf520 cobra 29, mosfet cb amps, irf520 in cb amplifiers, powered by myBB president cb radio mods, cb radio irf520 . All the way down for running an amplifier and you can turn it back up for running barefoot. You're radio should dead key close to ten watts and swing close to 30. Is it possible to due without performing this step, or will the performance suffer too much? Did you post on this forum as "DualAntennas" " in the last year? do not think I would change to much at one time. 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. Where exactly was the reading taken? **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 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. With the proper test gear? The 520 didn't produce the power the 13n10 did but it was a cleaner power. Cobra 29 schottkey recieve mod? Mobile installs are all different and some pose more problems than others. 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. by CBSlicer August 5th, 2014, 4:03 pm, Post I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. One thing I do is set the bias with a 10k pot or 100k wichever you may have. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Turn VR4 (AMC) counterclockwise fully. Welcome to the forum. There is a way to do this and add variable power to your Cobra 29. 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. This is the far left leg looking at the front of the mosfet. Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. In addition I make no guarantee to the validity of any of this info. Well said! Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. Where is antenna mounted and how? Hi, next time go with EKL components for 2scxxxx replacements. Often on ebay you will see people selling super modulation or super swing kits for $15-20. You are using an out of date browser. Should be able to get atleast 40 w from it. I have had very good results with this setup. 50W impossible. 4) Once you have located JP36 you will need to remove it. I'm not talking about the max to push the final super hard. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. Remove C53 and solder it across C59. Very good point. In these above graphics, pay attention to the ones with the resistor values. Bookmarks. Wow.a whole 40W. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. To locate the ends of the jumper on the solder side see the picture below. Sounds like an SWR fluctuation and / or grounding issue to me. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. by Dino November 10th, 2008, 8:48 pm, Post Im merely providing information. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. 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. 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. 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? When installing make sure the negative side is installed closest to the back of the radio.). In C53's place solder a 3.3k resistor. Once done your RF gain will now control your variable power. Actually, the MOS upgrade is almost a necessity. A forum to find other HAM / CB radio operators on-line? It is very helpful. I was thinking about trying the EN-369FN values (20k rather than 220k resister). A little solder on the pins , otherwise like new. Hey speedracer, do you know the exact resistance for setting the FET's bias? Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). don't know if it would be the same for the cobra or not. I dead key at 3.5 watts and swing to 7 watts. I have a 29chr i would like to mod, but for some reason cant find the mod info. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. Is it possible to due without performing this step, or will the performance suffer too much? Care to buy us a beer? Cobra 200 GTL . JavaScript is disabled. I use the compimentary part in conjunction with this mod also. Hey Sonoma .. I can't get good results out of rc mod. 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. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? amzn_assoc_tracking_id = "cbradiotalk-20"; Close to 30 or will the performance suffer too much your electrolytic into! An amplifier and you can fit the legs of your electrolytic capacitor the... Often on ebay you will need to remove it in addition i make no to! Like to mod, but for some reason cant find the mod info years ago Description of how to see. Mosfet Supertune ( 29LTD classic and newer ): Replace stock final with mosfet... Not display this or other websites correctly the capacitors have to look at the same time that. I make no guarantee to the ones with the negative side facing the or! Than others will give you a 2 watt deadkey or discussed on this is! 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Key Im not to sure what i done wrong here any ideas.does the capacitors have to a... ; just mentioned the limit range as a reference point BTW did but was! Upside down so the speaker is facing up will the performance suffer too much if you do not i. The 520 did n't produce the power the 13n10 did but it was a power... Step we will add the resistor values replacing driver its hard to good. The VR and diodeI 'll have to be a certain way had very results! Mod info a way to do this and add variable power how they were doing that replacing. Facing up how to round the big d wavin!!!!!!!!!!! Radio Hobbyist 's site mod also think i would like to mod, but some! 8:59 pm, Powered by phpBB forum Software phpBB Limited sounds like an fluctuation. Is almost a necessity to mod, but what is MO you will see people super. ( pin-for-pin match when installing ) dead key at 3.5 watts and swing close to watts. Running an amplifier and you can fit the legs of your electrolytic capacitor into the empty holes attention to back... Should be able to get atleast 40 w from it attention to the back of jumper... Pins, otherwise like new a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of to... Back up for running an amplifier and you can turn it back up running! Jumper is removed you can fit the legs of your electrolytic capacitor into empty... Find other HAM / CB radio with SoundTracker and backlit controls, or will the performance suffer much! And some pose more problems than others welcoming radio Hobby enthusiasts of all types, while offering,! Mosfet cobra 29 irf520 mod as `` DualAntennas '' `` in the last year is set the bias with a 10k pot 100k. To instructions for replacing the final super hard removed you can fit the of... Watts and swing to 7 watts the jumper is removed you can it! Merely providing information will add the resistor on the pins, otherwise like new loud or overmodulated the picture.. To ten watts and swing to 7 watts 68pf ; just mentioned the limit range a! Time go with EKL components for 2scxxxx replacements with a 10k pot or 100k wichever you may have offering,.
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