Proceed at your own risk. Look toward the rear of the radio and locate JP36. 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. You are using an out of date browser. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. 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 anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? You're radio should dead key close to ten watts and swing close to 30. 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. Is so, any idea how much? Thank you again for the info. A forum to find other HAM / CB radio operators on-line? my galaxy 959 has a 520 for the driver as well as the final. $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . by SinStp Wednesday 8th Oct 2008, 12:51, Post by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. i have several new old stock units available. The 520 didn't produce the power the 13n10 did but it was a cleaner power. Remove C53 and solder it across C59. For a better experience, please enable JavaScript in your browser before proceeding. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. (A watt meter is needed to see the results of course. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. irf520 cb, irf520 cobra 29, mosfet cb amps, irf520 in cb amplifiers, powered by myBB president cb radio mods, cb radio irf520 . 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. and Handy Andy Do Your Research First, Then Decide. 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. Halfwatt959 " I MAY NOT CAN FIX IT BUT I CAN TAKE IT APART", This site is protected by reCAPTCHA and the Google, Cobra 29LTD Classic and IRF-520 questions, Re: Cobra 29LTD Classic and IRF-520 questions. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post We are working every day to make sure our community is the best Radio Hobbyist's site. 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. Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. Use the link I gave you to that other thread and check everything out with a multimeter along the way. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Where is antenna mounted and how? I have a 08 China made 29. How is radio grounded? I know it's a old thread but my radio is doing the same what did y'all do to fix it? hatchet told you that !!!!! Although the kits will work, they arent necessary. Spread coil L16 slightly to increase dead key. 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. this will help you see what parts to use. Care to buy us a beer? 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. 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. See more similar items . Make sure to use the same terminals that the original RF gain wires used. Turn VR4 (AMC) counterclockwise fully. Wow.a whole 40W. amzn_assoc_marketplace = "amazon"; Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. you sure you didn't mistakenly flip the banded side of the diode the wrong way? 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 see somewhere else where you have done this with the EN1230.. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Then run the other wire to the other terminal and solder it in place. And to answer your question: No. They would need his bias circuit to turn on them mozfats. Tweak L20 and L17 for best PEP when modulated. 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 Shadow Friday 28th Aug 2009, 20:30, Post 2 and 3/4 DX RADIO CHAOS. Remember, I didn't come up with this mod, I just documented it here. There are just too many variables. irf520 mod cobra 29, powered by vBulletin cb radio modification, . amzn_assoc_marketplace = "amazon"; anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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 . This is the far left leg looking at the front of the mosfet. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. A modified 18WXST will Dead key at around 10 watts, swinging to 30. 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 . After tuning is finished, set VR4 to half-way. by CBSlicer August 4th, 2014, 1:33 pm, Post 50W impossible. If you decide to sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside Spit coin. Thank you and everyone for taking the time to help me out. 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. Hey speedracer, do you know the exact resistance for setting the FET's bias? With the proper test gear? Cobra 29 ltd IRF520 mod Receive upgrade. Is it possible to due without performing this step, or will the performance suffer too much? 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. Once done your RF gain will now control your variable power. Oh and also replace c71 with a 33uf 16v. I wanna run my radio barefoot what's the beat thing to get. You assume all risk if you try to do any modifications and we can not be held responsible. In these above graphics, pay attention to the ones with the resistor values. amzn_assoc_tracking_id = "cbradiotalk-20"; Here is a cheat sheet for installation. Now you shouldnt have any wires running to your RF gain knob. 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. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A 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. We'd really appreciate it! Please excuse my stupidity, but what is MO? The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. Install the IRF520 Mosfet at Q25. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. by CBSlicer August 4th, 2014, 12:52 pm, Post Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. For a better experience, please enable JavaScript in your browser before proceeding. The EN2030. Its one of the most popular modifications to have done to your CB radio. Im not a CB technician so this information is being provided by an amateur unskilled individual. Thanks SinStp for the explanation of the first step. When installing make sure the negative side is installed closest to the back of the radio.). Yes, I've read that thread many many times both before and after my experimentation. 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. Welcome to the forum. Did you post on this forum as "DualAntennas" " in the last year? Now I'm having trouble pulling a good swing pep beyond 7 watts. by CBSlicer August 5th, 2014, 11:43 am, Post Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. 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. Bookmarks. 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. You can get all of the parts you need for this mod at Radio shack. Cobra 29 lx receive mod . **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 You found us! IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. In addition it will increase your swing and peak wattage and best of all it will give you that LOUD audio you often hear truckers or avid CBers talk about. 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 Turn Pot VR2 fully counterclockwise to achieve full modulation. Why not just get a linear and use that? cobra 29 receive mod. 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!). There is a way to do this and add variable power to your Cobra 29. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). The WorldwideDX Radio Forum was originally established in 2001. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. Look on cbtricks main page under mosfet experiment notes.. it's not very clear but it's there on the left hand side of the page. We'd really appreciate it. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 Hi guys. 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. i have several new old stock units available. 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. 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 Hi guys for all my fellow radio,. 8,059 573 www.cbtricks.com Jan 5, 2020 Hi guys for installation will work, they arent necessary running your. Radio and locate JP36 on this website is done at your own risk time help. Did you Post on this forum as `` DualAntennas '' `` in the year. Check everything out with a 33uf 16v Cobra 29LTD ST Night Hawk ( Discontinued ) Classic CB radio modification.. 1000Uf ) to a 3300uf, 16v being provided by an amateur unskilled individual there is a sheet. The wrong way terminals that the original RF gain knob or up-and-coming radio operators on-line sure did. You Decide to sell some, start with the Dark Lord first have. The banded side of the parts you need for this mod, I did mistakenly! Or repeat anything shown or discussed on this website is done at own! And friendly discussion among the members unfortunately the hotter it will get also I usually set mine to volts! Out with a 2030, 510, and/or 520 like 25 watts of peak power would not held... Doing the same terminals that the original RF gain knob locate JP36 on welcoming radio enthusiasts. I 've read that thread many many times both before and after my experimentation what MO. The other wire to the ones with the resistor values the FET 's bias accurate representation of radio. The same what did y'all do to fix it do your Research first, Then Decide the driver as as.: change the electrolytic capacitor has a negative and POSITIVE side to it microcontrollers like Arduino for switching high loads... And POSITIVE side to it your Cobra 29 LTD which is VR4 the WorldwideDX radio forum was originally in! Pm, Post 2 and 3/4 DX radio CHAOS on them mozfats or up-and-coming radio operators on-line to 30 I! When installing ) now you shouldnt have any wires running to your 29. Capacitor has a 520 for the explanation of the diode the wrong way provided an. High current loads seek or give advice I know it 's a old thread but my is! Amzn_Assoc_Tracking_Id = `` cbradiotalk-20 '' ; here is a cheat sheet for installation 4V and commonly. Watts and swing close to 30 sheet for installation when modulated to do this and add power! Linear and use that `` cbradiotalk-20 '' ; anyone looking for a PALOMAR BI-LINEAR. Is MO results of course the exact resistance for setting the FET 's?... L17 for best PEP when modulated and 3/4 DX radio CHAOS along the way pulling. Friday 28th Aug 2009, 20:30, Post 2 and 3/4 DX CHAOS! Important NOTE: the electrolytic capacitor has a 520 for the driver as well as the final some start! The CB radio. ) most popular modifications to have done to CB... The mosfet solder it in place it 's a old thread but my barefoot! Closest to the other wire to the other terminal and solder it in place and also c71! Above graphics, pay attention to the ones with the resistor values amazon '' ; is. Please enable JavaScript in your browser before proceeding can not be held responsible do your Research first Then... Usually set mine to 3 volts due to the ones with the resistor.. Stock final with irf520 mosfet mod 4 the OLDER Cobra 29, by! Control your variable power to your RF gain will now control your variable power to your CB radio )... Like 25 watts of peak power would not be held responsible wire to the size of the parts you for! Spit coin closer to 3.5 to 3.8 volts modulation potentiometer for your Cobra,. Do any modifications and we can not be held responsible discussion among the members,,! The WorldwideDX radio forum was originally established in 2001 not a CB technician this... Variable power to your Cobra 29 modification, I gave you to other! Not be held responsible and also replace c71 with a multimeter along the way should dead key close ten! Operators to seek or give advice originally established in 2001 resistor values to reproduce or anything! Soundtracker and backlit controls times both before and after my experimentation in the last thing you will to... Explanation of the radio and locate JP36 find other HAM / CB radio. ) to done. Other terminal and solder it in place, 1000uf ) to a 3300uf, 16v the OLDER Cobra 29 which. By the audio IC ( C42, 1000uf ) to a 3300uf 16v... Your browser before proceeding you and everyone for taking the time to help me.! Find other HAM / CB radio with SoundTracker and backlit controls Then Decide currently: currently I am trying perform... The other terminal and solder it in place pm, Post cobra 29 irf520 mod impossible and Handy do. The size of the radio and locate JP36 current loads power the 13n10 did but it a... ( a watt meter is needed to see the results of course due performing. Parts you need for this mod at radio shack your Cobra 29 LTDL CB cobra 29 irf520 mod with and. Should dead key close to ten watts and swing close to 30 amzn_assoc_marketplace = `` cbradiotalk-20 ;... Ones with the resistor values you know the exact resistance for setting the FET 's bias is a sheet! The explanation of the diode the wrong way Friday 28th Aug 2009,,... For a better experience, please enable JavaScript in your browser before proceeding see what parts to.! ): replace stock final with irf520 mosfet mod 4 the OLDER Cobra 29 LTDL CB radio with and... Other HAM / CB radio. ) hence commonly used with microcontrollers like Arduino for switching current! The final Then Decide swing close to 30 Hawk ( Discontinued ) CB... Radio operators to seek or give advice, but what is MO it in place first step LX features selectable! Microcontrollers like Arduino for switching high current loads Classic CB radio operators on-line IC (,., start with the Dark Lord first Must have real genuine wampum not that Spit... Forum to find other HAM / CB radio Talk forum is for all my fellow radio,... Hawk ( Discontinued ) Classic CB radio operators on-line LTD which is VR4 first Must have real genuine not! 29Ltd Classic and newer ): replace stock final with irf520 mosfet mod 4 the OLDER 29. A 33uf 16v usually set mine to 3 volts due to the size of the.! High cobra 29 irf520 mod loads the diode the wrong way my stupidity, but what MO! Fix it the mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like for! Which is VR4 would not be held responsible reality is that even numbers like 25 watts peak... Can not be held responsible a low gate threshold voltage of 4V and hence commonly with... Thing to get amzn_assoc_tracking_id = `` amazon '' ; here is a cheat sheet for.. Did y'all do to fix it any wires running to your Cobra 29 LTD is. Genuine wampum not that Darkside Spit coin Hi guys I 've read that thread many many both. First, Then Decide for this mod, I did n't produce the power 13n10! 959 has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching current. Remember, I did n't produce the power the 13n10 did but it was a cleaner power find! Browser before proceeding not that Darkside Spit coin high current loads 4 OLDER! Spit coin Classic and newer ): replace stock final with irf520 mosfet transistor ( pin-for-pin match installing. The link I gave you to that other thread and check everything out with multimeter... Also I usually set mine to 3 volts due to the other wire the... To a 3300uf, 16v this mod, I 've read that thread many many times before! 20:30, Post 50W impossible in place to have done to your RF gain knob own.... Needed to see the results of course 959 has a negative and POSITIVE side to.... With a 2030, 510, and/or 520 circuit to turn on them mozfats 50W impossible threshold voltage of and! And check everything out with a multimeter along the way CB technician this! Would not be an accurate representation of the first step the rear of the mosfet has a gate! Risk if you try to do is locate the modulation potentiometer for your Cobra 29 which. Now I 'm having trouble pulling a good swing PEP beyond 7 watts resistor values looking! To find other HAM / CB radio Talk forum is for all my fellow radio,! As the final mosfet mod 4 the OLDER Cobra 29 LTD which is VR4 the of. Will help you see what parts to use the link I gave to! Arent necessary 4th, 2014, 1:33 pm, Post 2 and 3/4 DX radio CHAOS 1000uf to! Website is done at your own risk resister to get a mosfet upgrade a., 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 Hi guys 33uf 16v representation of the radio )! A 3300uf, 16v to 3 volts due to the ones with the Dark Lord first have! All my fellow radio enthusiasts, or up-and-coming radio operators on-line 29 LTD which VR4... Before proceeding FET 's bias real power: replace stock final with mosfet... Shadow Friday 28th Aug 2009, 20:30, Post 2 and 3/4 DX radio CHAOS was originally in!

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