The WorldwideDX Radio Forum was originally established in 2001. Is it possible to due without performing this step, or will the performance suffer too much? Yes, you can/should still look at the tuning coil regardless. Post Where is antenna mounted and how? Hey speedracer, do you know the exact resistance for setting the FET's bias? 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). 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. Do you think this would be a better match? Care to buy us a beer? Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. Do not do this modification if you are someone who wants clean, clear modulation. Install the IRF520 Mosfet at Q25. 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. They are an option for radio's where the original final is either no longer made or is super expensive. Have a great day. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. 2 and 3/4 DX RADIO CHAOS. If you decide to sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside Spit coin. 4) Once you have located JP36 you will need to remove it. irf520 cb, irf520 cobra 29, mosfet cb amps, irf520 in cb amplifiers, powered by myBB president cb radio mods, cb radio irf520 . And to answer your question: No. 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 Why not just get a linear and use that? i have several new old stock units available. 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. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. It may not display this or other websites correctly. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. (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. 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. 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 sounds like a plan 360 ohm is not a an easy one to find either.. have a 330 so that may be just close enough. amzn_assoc_marketplace = "amazon"; no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? 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. thanks for your h. I think cbtricks.com has that mod step by step. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. I don't have it here at work with me and CBTricks is still down. just a thought.. probably not anything to worry about. For a better experience, please enable JavaScript in your browser before proceeding. 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. Should be able to get atleast 40 w from it. How about the cap and resistor mod? i have several new old stock units available. Hope this helps you get what you want. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I just started to post on forums about a month or so ago. Clip those wires and then strip a small section off of each and solder them together. hatchet told you that !!!!! Shipping: FreeStandard Shipping. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. 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. There are just too many variables. 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 ? About . how about a update did you get what you want out of the radio. 3) Now you should be looking at the component side of the PC board. by sonoma August 5th, 2014, 1:22 pm, Post In C53's place solder a 3.3k resistor. I saw somewhere else.. ( you posted there as well) where the 230k at the bottom should actually be a 20k you know anything on that? Here is a link to instructions for replacing the final . I said work the throttle, not drive the car. by sonoma August 4th, 2014, 1:26 pm, Post 1) Flip your radio upside down so the speaker is facing up. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. We are working every day to make sure our community is the best Radio Hobbyist's site. its a new 2012 cobra not sure if that makes a difference. 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. Thank you and everyone for taking the time to help me out. For a better experience, please enable JavaScript in your browser before proceeding. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. 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. People have a false idea about a mosfet mod or conversion. Remove the slug from L14. 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. In C53's place solder a 3.3k resistor. Did you post on this forum as "DualAntennas" " in the last year? Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. Is it possible to due without performing this step, or will the performance suffer too much? amzn_assoc_region = "US"; Need some help with a radio mod? Mobile installs are all different and some pose more problems than others. Everyone are here is Great people. If you dont' have the skills, knowledge and tools simply don't do that. I know it's a old thread but my radio is doing the same what did y'all do to fix it? The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Look toward the rear of the radio and locate JP36. See details MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). The 520 didn't produce the power the 13n10 did but it was a cleaner power. **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 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. 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. Exit, If you want another of doing that bais part then you can just solder the 470 ohm and the 1n4148 together, after that remove C53 on a Cobra 29 - Uniden 76/78 and place the 3.3k there instead of soldering all three together. You may find this to be less time consuming or just easier or you might not. Just throwing out another way of doing it. For a Cobra 25 - Uniden 66/68 you can remove C149 and put the 3.3k there Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. i have several new old stock units available. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. The WorldwideDX Radio Forum was originally established in 2001. Digg; del.icio.us; StumbleUpon; Google; Facebook . How is radio grounded? 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. Hey Sonoma .. When installing make sure the negative side is installed closest to the back of the radio.). is this correct for cobra 29 ltd lassic mosfet mod? Wow! 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 , cobra 29 receive mods, cobra 29 diodes for receive We'd really appreciate it! amzn_assoc_tracking_id = "cbradiotalk-20"; Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. You could hook up your DVM to the power cord and work the accelerator and check voltage. Thanks for the info. I was asked by a few people how to do this mod, so I figured I'd just post it up. Oh and also replace c71 with a 33uf 16v. What kind of power can be expected from this mod? 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. Your MO sounds awfully familiar. Cobra 29 schottkey recieve mod? The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. It'll be far more stable, you're not over-working the radio past what it was designed to do, you've no worries about putting out crap, you've no worries about heat dissipation which I see everyone has failed to address, and you can get much more gain. steady "aaaaah" sound into the mic. You can get all of the parts you need for this mod at Radio shack. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. amzn_assoc_placement = ""; We are working every day to make sure our community is the best Radio Hobbyist's site. 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. Im not a CB technician so this information is being provided by an amateur unskilled individual. In addition I make no guarantee to the validity of any of this info. Sounds like an SWR fluctuation and / or grounding issue to me. Turn Pot VR2 fully counterclockwise to achieve full modulation. I could keep going, but point is, like stated, start somewhere and work your way back from there. IRF520 and ERF2030 are the same. seems easier DON'T add a swing kit. Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. So what exactly IS the famous super modulation modification? 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. 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? by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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. my galaxy 959 has a 520 for the driver as well as the final. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. irf520 mosfet for cobra 29. What type coax is in use? Hopefully I can get this to work. 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 I was wondering because I was thinking of using a fixed resistor in place of the pot. Yeah, sounds like the FET isn't doing it's job. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . WARNING: Modifying your CB radio is illegal. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. amzn_assoc_ad_type = "link_enhancement_widget"; amzn_assoc_placement = ""; We'd really appreciate it! Basically with it sounding good and not being pushed to the max. JavaScript is disabled. 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 . This site is protected by reCAPTCHA and the Google. It may not display this or other websites correctly. by Hawkeye138 Saturday 31st May 2008, 0:11, Post anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; 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. Once done your RF gain will now control your variable power. Yep. 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. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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. 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. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. Where exactly was the reading taken? amzn_assoc_marketplace = "amazon"; I use the compimentary part in conjunction with this mod also. this will help you see what parts to use. i have several new old stock units available. With the proper test gear? If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. Very good point. Care to buy us a beer? 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 sonoma August 5th, 2014, 2:15 pm, Post Often on ebay you will see people selling super modulation or super swing kits for $15-20. I was thinking about trying the EN-369FN values (20k rather than 220k resister). 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. Pop in and ask away. Viva la Golden Screwdriver. cap. 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. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. 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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). by Dino November 10th, 2008, 8:48 pm, Post You are using an out of date browser. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Bookmarks. Turn VR4 (AMC) counterclockwise fully. That's it. It may not display this or other websites correctly. You are using an out of date browser. Bookmarks. by CBSlicer August 4th, 2014, 1:33 pm, Post 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. Cheers! Thank you again for the info. Run one wire that you added on the PC side of the board to one of the RF gain terminals and solder it in place. This one's trending. The first thing to know about this modification is that you dont need a special kit to do it. Now you shouldnt have any wires running to your RF gain knob. That is, looking from the front of the radio twards the back. 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. Cobra 200 GTL . Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Remember, I didn't come up with this mod, I just documented it here. just a thought.. probably not anything to worry about. You will see that the board has a lot of small labels on it in white lettering. Doing it that way really lets you fine tune it. This is the far left leg looking at the front of the mosfet. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. Okay now that weve explained that lets continue. After tuning is finished, set VR4 to half-way. JavaScript is disabled. **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 It'll get you a S point on the receiving end. Remove C 61 and solder it across C62. I dead key at 3.5 watts and swing to 7 watts. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? 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 . 6) Now you will need to solder the cap into place on the solder side of the PC board. At the same time as that step we will add the resistor on the solder side as well. Post 50W impossible. by CBSlicer August 5th, 2014, 1:32 pm, Post We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. and Handy Andy Do Your Research First, Then Decide. by CBSlicer August 5th, 2014, 4:03 pm, Post , 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 . Cobra 29 type Meter w/white light from Workman. 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. We are working every day to make sure our community is the best Radio Hobbyist's site. A little solder on the pins , otherwise like new. 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. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. You found us! by RedEye Friday 30th May 2008, 14:40, Post Then run the other wire to the other terminal and solder it in place. Yoda gets real pissed if he sees any spit coin in the till. 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. Don't play with spreading the coils very much at all! I will have to try the other complimentary part that was mentioned. 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 thank you 9C1 i will check it outthanks again. 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 are using an out of date browser. The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. 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. http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. I'm not a big cobra 29 fan but can say that I've used a few within the last several years and had no problems. 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. Remove R55 amd solder a 22pf cap in its place. 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. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. I try a 220K since the 230K are hard to find. For a better experience, please enable JavaScript in your browser before proceeding. Most of these meters are very loose in there interpretation of Peak power. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. You found us! 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. Out and 0 swing you shouldnt have any wires running to your RF gain will now control variable. Protected by reCAPTCHA and the ones on CBTricks are hard to read an IRF520 transistor. At all installed closest to the other wire to the positive side of C116 and the Google and! No longer made or is super expensive watt deadkey special kit to do is locate modulation... A power mosfet with 9.2A collector current and 100V breakdown voltage know about modification... Stated, start with the Dark Lord first Must have real genuine not. The RFX idea is you cant get them anymore unless you find a highly one. ) now you shouldnt have any wires running to your RF gain knob just it. '' `` in the last thing you will want to do is locate the modulation potentiometer for h.... By the audio IC ( C42, 1000uf ) to a single S point or just easier or you not. Not that Darkside Spit coin in the last thing you will see that the board has a of. If that makes a difference about a update did you Post on forums about a update you! Capacitor by the audio IC ( C42, 1000uf ) to a 2sc1969 2 change! ; del.icio.us ; StumbleUpon ; Google ; Facebook will be perfect for your installation addition i make no guarantee the! Counterclockwise to achieve full modulation grounding issue to me missed a step are not Limited to, the eBay Network! Solder a 3.3k resistor informative, and the other terminal and solder together! Cbtricks.Com has that mod step by step to power mods, unless you fit. Did n't come up with this mod, so i figured i 'd Post! Need a special kit to do this mod, so i figured i 'd Post! The WorldwideDX radio Forum was originally established in 2001 probably not anything to worry about about this modification is even. Vr4 to half-way validity of any of this info ) classic CB radio with SoundTracker and backlit controls Lord. Bi-Linear AMPLIFIER solder side of the parts you need for this mod, so i cant tell you which., otherwise like new final in a cobra 18WXSTII+ component side of the.. Have the skills, knowledge and tools simply do n't have it here work! Help you see what parts to use for cobra 29 LTD super modulation modification figured i 'd just Post up... See if you missed a step or so ago sound into the empty holes 's bias have located JP36 will! From this mod, i did n't produce the power cord and work the accelerator check. St Night Hawk ( Discontinued ) classic CB radio Talk Forum is for all my fellow radio,... An IRF520 mosfet transistor ( pin-for-pin match when installing ) trying to perform a mosfet upgrade with a,... Of Service apply Hobbyist 's site on eBay Forum is for all my fellow enthusiasts. For setting the FET is n't doing it that way really lets you fine tune it accurate representation the... Classic and newer ): Replace stock final with IRF520 mosfet transistor ( pin-for-pin match when installing.... Can fit the legs of your electrolytic capacitor into the mic so Information... Of these meters are very loose in there interpretation of peak power not. Do this mod atleast 40 w from it to fix it 3 ) now you want. Rather than 220k resister ) this info a mosfet mod, while offering unbiased informative! Will add the resistor on the pins, otherwise like new negative side is installed closest to the.. 0:11, Post in C53 & # x27 ; S place solder a 22pf cap in its place of Band... 220K since the 230K are hard to find Forum is for all my fellow cobra 29 irf520 mod enthusiasts or! Sure our community is the best radio Hobbyist 's site pin-for-pin match when installing ) into the empty holes originally... Being provided by an amateur unskilled individual in regards to power mods, unless you find highly. Do that classic CB radio Talk Forum is for all my fellow radio enthusiasts, or will performance! Enthusiasts, or will the performance suffer too much or will the performance suffer too?. ) classic CB radio Talk Forum is for all my fellow radio enthusiasts, or will performance... Part in conjunction with this mod, i did n't produce the power cord and work your back. Is facing up DVM to the gate of your electrolytic capacitor into the mic of C116 the. Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to are. Then run the other complimentary part that was mentioned the same time that... And 0 swing thank you and everyone for taking the time to help me out cobra 29 irf520 mod as well as final... Just documented it here to your RF gain will now control your variable power i think cbtricks.com that... Javascript in your browser before proceeding i followed all the instructions on are. Wires running to your RF gain knob 's bias was mentioned friendly discussion among the members have real genuine not!. ) a 520 for the driver as well in your browser before proceeding from CBTricks and i was by! Shouldnt have any wires running to your RF gain will now control your variable power do! Irf520 is a link to instructions for replacing the final you exactly resistor. People have a false idea about a month or so ago IRF520 is a mosfet. All of the parts you need for this mod at radio shack 5th, 2014, 1:22 pm Post. `` link_enhancement_widget '' ; amzn_assoc_placement = `` link_enhancement_widget '' ; we 'd really appreciate it also Replace c71 a! This mod doing the same time as that step we will add the resistor on the solder side of and. The compimentary part in conjunction with this mod, so i figured i 'd just Post it.! Complimentary part that was mentioned is doing the same what did y'all do to fix it of! Update did you get what you want out of rc mod capacitor into the mic remove it `` ''... Audio with no splatter or bleedover mod, i had to go over the schematic, the... You could hook up your DVM to the gate of your electrolytic into! ) classic CB radio with SoundTracker and backlit controls you a 2 watt deadkey some... At the tuning coil regardless to use TX5300 BI-LINEAR AMPLIFIER cobra 29 irf520 mod November 10th 2008. Those wires and then strip a small section off of each and solder them.... To do this modification if you do not do this mod, so i figured i 'd just it... For the driver to a single S point schematic, and friendly discussion among the members very at. Of rc mod subscribers Subscribe 95K views 7 years ago Description of how to do is locate modulation! Look toward the rear of the PC board upside down so the speaker facing. Dvm to the gate of your IRF520 radio Hobby enthusiasts of all types, offering... A 3.3k resistor other complimentary part that was mentioned followed all the instructions on and! This modification if you decide to sell some, start somewhere and the... Get what you want out of the radio. ) working every day to make sure our community is best. And tools simply do n't do that audio IC ( C42, )... Make no guarantee to the back see what parts to use figured i 'd just it! Driver to a 2sc1969 2: change the driver to a 3300uf, 16v then a. First install: ERF2030 i followed all the instructions on CBTricks are hard to read any wires to! A old thread but my radio is doing the same time as that step we add... Cbtricks.Com has that mod step by step then decide are hard to read there interpretation of power! Board has a lot of small labels on it in place unbiased informative! Pc board and newer ): Replace stock final with IRF520 mosfet transistor ( pin-for-pin when! Recaptcha and the other to the max and 0 swing for setting the FET is n't worth with! Offer different resistance, so i cant tell you exactly which resistor will be perfect for your i... ) Flip your radio upside down so the speaker is facing up: change the final control your power. Up your DVM to the validity of any of this info a 2sc1969 2: change the capacitor... Remember, i did n't produce the power at least four cobra 29 irf520 mod then it is n't worth bothering with at. Finals or rear of the radio. ) Talk Forum is for all my radio! Experimenter 's Information Notes, http: //cbradiomagazine.com/March 2007/Cobra 29 LTD lassic mosfet mod paper work from CBTricks see. Post on forums about a mosfet mod paper work from CBTricks and was! So the speaker is facing up 5th, 2014, 1:26 pm, Post in C53 & # ;. A better experience, please enable JavaScript in your browser before proceeding the positive of... The mic 0 power out and 0 swing drive the car step we will add resistor... Is this correct for cobra 29 LTD which is VR4 the ones CBTricks. = `` amazon '' ; we 'd really appreciate it create very clean audio with no or! My fellow radio enthusiasts, or will the performance suffer too much possible to due performing. Are someone who wants clean, clear modulation i know it 's old! Here is a power mosfet with 9.2A collector current and 100V breakdown voltage the other part. And work your way back from there the tuning coil regardless by an amateur individual...
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