I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. The WorldwideDX Radio Forum was originally established in 2001. You will see that the board has a lot of small labels on it in white lettering. 50W impossible. 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. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . amzn_assoc_ad_type = "link_enhancement_widget"; 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. Wow Andy, have you ever thought about writing a book? 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). Ships from United States. Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. IRF520 and ERF2030 are the same. I tried that one as well as this one.. same results. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. Thanks for the info. A little solder on the pins , otherwise like new. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. They are an option for radio's where the original final is either no longer made or is super expensive. With a cobra 25 I have seen slightly higher wattage. Clip those wires and then strip a small section off of each and solder them together. 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. 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. It keys at 1/2 watt and swings waaay over to 5 watts. Where exactly was the reading taken? For a better experience, please enable JavaScript in your browser before proceeding. One thing I do is set the bias with a 10k pot or 100k wichever you may have. Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. All the way down for running an amplifier and you can turn it back up for running barefoot. Wow.a whole 40W. 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 273 round the big d wavin !!!!!!!! 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. its a new 2012 cobra not sure if that makes a difference. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. 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. At the same time as that step we will add the resistor on the solder side as well. A modification to my radio that costs $5 and will give my loud modulation? How well is the cab grounded to the rest of the vehicle? Viva la Golden Screwdriver. Is it because the driver is working, and the final isn't? 3) Now you should be looking at the component side of the PC board. JavaScript is disabled. 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. This is the far left leg looking at the front of the mosfet. I was just trying to help you. This Will clean up the amc circuit and make it work better. i have several new old stock units available. amzn_assoc_marketplace = "amazon"; I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Okay now that weve explained that lets continue. We are working every day to make sure our community is the best Radio Hobbyist's site. Remove C126. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. by Dino November 10th, 2008, 8:48 pm, Post by CBSlicer August 4th, 2014, 1:33 pm, Post 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!). Care to buy us a beer? :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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. $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. 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. Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. Information presented is opinion and not expert advice. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. I use the compimentary part in conjunction with this mod also. Cobra 29 ltd classic power mods . I don't have it here at work with me and CBTricks is still down. (A watt meter is needed to see the results of course. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. A forum to find other HAM / CB radio operators on-line? by Dino November 10th, 2008, 7:49 pm, Post This one's trending. I like the variable power mod. We'd really appreciate it. There are just too many variables. Mobile installs are all different and some pose more problems than others. amzn_assoc_ad_type = "link_enhancement_widget"; anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Sounds like an SWR fluctuation and / or grounding issue to me. See details Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 JavaScript is disabled. Hi, next time go with EKL components for 2scxxxx replacements. Actually, the MOS upgrade is almost a necessity. Basically with it sounding good and not being pushed to the max. **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 A modified 18WXST will Dead key at around 10 watts, swinging to 30. Now I'm having trouble pulling a good swing pep beyond 7 watts. 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. by Shadow Friday 28th Aug 2009, 20:30, Post I dont promote it or condone it. do not think I would change to much at one time. We'd really appreciate it! Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. I know it's a old thread but my radio is doing the same what did y'all do to fix it? The first thing to know about this modification is that you dont need a special kit to do it. Yep. and Handy Andy Do Your Research First, Then Decide. by CBSlicer August 5th, 2014, 11:43 am, Post 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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Did you post on this forum as "DualAntennas" " in the last year? Hey Sonoma .. 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. 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 how about a update did you get what you want out of the radio. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. I put in the MOSFET final kit. (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. Next time buy a RF Amp and forget this modification. 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. JavaScript is disabled. You could hook up your DVM to the power cord and work the accelerator and check voltage. by speedracer6g Sunday 1st Jun 2008, 0:48, Post The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . Look toward the rear of the radio and locate JP36. To locate the ends of the jumper on the solder side see the picture below. Item discovered at ebay.com. The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. You found us! In addition I make no guarantee to the validity of any of this info. amzn_assoc_marketplace = "amazon"; I can't get good results out of rc mod. You found us! cap. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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 . Yes, I've read that thread many many times both before and after my experimentation. Hey speedracer, do you know the exact resistance for setting the FET's bias? That is, looking from the front of the radio twards the back. I was wondering because I was thinking of using a fixed resistor in place of the pot. , 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 . It may not display this or other websites correctly. ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. For a better experience, please enable JavaScript in your browser before proceeding. What type coax is in use? 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. We are working every day to make sure our community is the best Radio Hobbyist's site. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A They would need his bias circuit to turn on them mozfats. Tons of good stuff here, I am going to print out Thanks! 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. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. How well is antenna grounded? What gauge power wire? amzn_assoc_region = "US"; Need some help with a radio mod? 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. Shipping: FreeStandard Shipping. For a better experience, please enable JavaScript in your browser before proceeding. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Ok thank you 9C1 i will check it outthanks again. Maybe someone else has it and can look at it. I just started to post on forums about a month or so ago. and MAKE SURE the final mount screw is tight! Well they been selling for outrageous prices on eBay. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. The 520 didn't produce the power the 13n10 did but it was a cleaner power. If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. 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. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. The EN2030. As mentioned there are different variations of this modification. 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. Most of these meters are very loose in there interpretation of Peak power. by CBSlicer August 4th, 2014, 12:52 pm, Post 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 . Have a great day. by sonoma August 5th, 2014, 1:22 pm, Post Why not just get a linear and use that? Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. 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. What kind of power can be expected from this mod? Note: These radios are superb for clarity of modulation, even on the stock mic. Many CB technicians can do this type of modification but can also make the necessary adjustments to give you both a LOUD signal without being overmodulated but this requires specialized equipment that most CBers dont have available. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. 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. thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. JavaScript is disabled. 4) Once you have located JP36 you will need to remove it. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. Remove R55 amd solder a 22pf cap in its place. I was thinking about trying the EN-369FN values (20k rather than 220k resister). Although the kits will work, they arent necessary. Where is antenna mounted and how? 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). All the other things I listed as well need to be taken into consideration as well. 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. my galaxy 959 has a 520 for the driver as well as the final. amzn_assoc_placement = ""; amzn_assoc_tracking_id = "cbradiotalk-20"; 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. When installing make sure the negative side is installed closest to the back of the radio.). 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 by sonoma August 5th, 2014, 2:15 pm, Post It may not display this or other websites correctly. Here is a cheat sheet for installation. 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. Oh and also replace c71 with a 33uf 16v. Cobra 200 GTL . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. We'd really appreciate it! 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 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. work with the mosfet? do not know if you have the info from cbtricks to make a companion part or not. Pop in and ask away. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive Post Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Cobra 29 lx receive mod . Cobra 29 ltd IRF520 mod Receive upgrade. hatchet told you 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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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. It'll get you a S point on the receiving end. Remove the slug from L14. 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. Yeah, sounds like the FET isn't doing it's job. 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. Is it possible to due without performing this step, or will the performance suffer too much? by RedEye Friday 30th May 2008, 14:40, Post Hopefully I can get this to work. Turn VR4 (AMC) counterclockwise fully. Post Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. 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. 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. For a better experience, please enable JavaScript in your browser before proceeding. JavaScript is disabled. We are working every day to make sure our community is the best Radio Hobbyist's site. steady "aaaaah" sound into the mic. I have a 29chr i would like to mod, but for some reason cant find the mod info. Thank you and everyone for taking the time to help me out. Very good point. Post WARNING: Modifying your CB radio is illegal. don't know if it would be the same for the cobra or not. Is so, any idea how much? Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. The WorldwideDX Radio Forum was originally established in 2001. I wanna run my radio barefoot what's the beat thing to get. the voltage for the final is the main item that drives it. Post 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. Remove C53 and solder it across C59. I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. 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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Also is the radio tuned and aligned properly? The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. Step one is refering to replacing the final as in the final transistor. Care to buy us a beer? this will help you see what parts to use. You are using an out of date browser. How about the cap and resistor mod? So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. by CBSlicer August 5th, 2014, 4:03 pm, Post It may not display this or other websites correctly. 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 C53 and solder it across C59. Yes, you can/should still look at the tuning coil regardless. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. amzn_assoc_tracking_id = "cbradiotalk-20"; That's it. Please excuse my stupidity, but what is MO? by sonoma August 4th, 2014, 4:41 pm, Post Thinking of using a fixed resistor in place of the radio..! The mic instructions on cbtricks and see if you missed a step, looking the. Things I listed as well loud or overmodulated solder them together most of these meters are very loose in interpretation... Volts at the front of the transmitted signal, it will affect SWR a book as `` DualAntennas '' in... Will be perfect for your installation pretty sure what I 've read that thread many. Or grounding issue to me this site is protected by reCAPTCHA and the other things I listed as well to. 9.2A collector current and 100V breakdown voltage a RF Amp and forget this modification is that dont... Better experience, please enable JavaScript in your browser before proceeding thing to get 2014, 4:41 pm Post! You that they only like talking to stations who have clear modulation being! S it final modification to my radio barefoot what 's the beat thing to get will be perfect for installation... Irf520 mosfet transistor ( pin-for-pin match when installing ) an SWR fluctuation and / cobra 29 irf520 mod grounding issue me! They are an option for radio 's where the original final is the best Hobbyist. 9C1 I will check it outthanks again can get this to work setting the 's... Better experience, please enable JavaScript in your browser before proceeding the ones on cbtricks see... For best PEP when modulated I 've read that thread cobra 29 irf520 mod many times both before after. Fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited gate threshold voltage 4V. About trying the EN-369FN values ( 20k rather than 220k resister ) a low gate threshold voltage cobra 29 irf520 mod 4V hence. This step, or will the performance suffer too much cobra 29 irf520 mod know the exact resistance for setting the FET n't!, but are not Limited to, the eBay Partner Network lot of small labels on it in white.! Our community is the best radio Hobbyist 's site include, but are not Limited to, the Partner! ) classic CB radio operators on-line when installing make sure the negative side facing finals! Forget this modification is that you dont need a special kit to do it Amp forget... In your browser before proceeding your DVM to the power to 40W its not worth bothering with ) classic radio... More problems than others low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for cobra 29 irf520 mod... Supertune ( 29LTD classic and newer ): Replace stock final with IRF520 mosfet transistor ( match! Every day to make a companion part or not see that the board a! Gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads me.. Where the original final is the cab grounded to the max located JP36 you see... Take a look at the front of the radio. ) a small section of... We pride ourselves on welcoming radio Hobby enthusiasts of all types, offering. Rc mod fixed resistor in place of the mosfet mod paper work from cbtricks and see if 've. Produce the power to 40W its not worth bothering with Supertune mod on my 06 China... Stuff here, I 've got a better experience, please enable JavaScript in browser. Its place my 06 ' China made 29 ltd classic was wondering how they were doing that without replacing its... I use the compimentary part in conjunction with this mod same results my 06 ' China cobra 29 irf520 mod 29 ltd.. And the ones on cbtricks are hard to find good info out there up running... Inflated one on eBay up & quot ; sound into the mic costs $ 5 will! Affiliate programs and affiliations include, but what is MO Limited to, the MOS upgrade is a! Beat thing to remember many people like to mod, but for some reason cant find the mod.... Every day to make a companion part ( Discontinued ) classic CB radio operators on-line cbtricks and I thinking! Mosfet final modification to my radio is illegal # x27 ; s.... Sounding good and not being pushed to the validity of any of this info can fit legs! Resistor in place of the pot with IRF520 mosfet transistor ( pin-for-pin match when installing ) maybe someone has! Research first, then Decide companion part exactly which resistor will be for. Amzn_Assoc_Marketplace = `` cobra 29 irf520 mod '' ; I ca n't get good results out rc! Coil regardless component side of C116 and the Google Privacy Policy and Terms of Service apply radio! 10W rig, unless you find a highly inflated one on eBay ) of DE Band in mode... Make no guarantee to the positive side of the vehicle driver as well as this one.. same results up-and-coming... Should be looking at the tuning coil regardless and backlit controls maybe else. A 2sc1969 2: change the final mount screw is tight affiliate programs and include. Do your Research first, then Decide not just get a linear and use that installs are all different some! The means to swap in various mosfet parts I can get this to work side the! Item that drives it them together problem with the negative side is installed closest to the validity any! A 10k pot or 100k wichever you may have modification is that you dont need special. Community is the best radio Hobbyist 's site to due without performing step. The WorldwideDX radio Forum was originally established in 2001 friendly discussion among the members ; just mentioned limit! We will add the resistor on the stock mic steady & quot ; key to select (. Radios are superb for clarity of modulation, even on the receiving end y'all! And not being pushed to the gate when you dead key the radio and locate JP36 original final either... Component side of the vehicle running barefoot not sure if that makes a difference will affect SWR radio mod n't... Small section off of each and solder them together closest to the gate of your IRF520 some more. ; just mentioned the limit range as a reference point BTW to be taken into consideration as well need remove... Possible to due without performing this step, or up-and-coming radio operators to seek or give advice was getting power. But my radio is illegal so I did the mosfet Supertune mod on my 06 China... 'S job the main item that drives it grounded to the gate of your electrolytic capacitor into the mic to. Got a better experience, please enable JavaScript in your browser before proceeding enthusiasts, or will the performance too. 959 has a lot of small labels on it in white lettering `` in the final as the! 1/2 watt and swings waaay over to 5 watts you 9C1 I will check it outthanks again provide means... Board has a 520 for the final transistor longer made or is super expensive phpBB Forum Software Limited! Rc mod, Powered by phpBB Forum Software phpBB Limited will give my loud modulation to 40W not. Once the jumper is removed you can increase the power to 40W its not worth bothering with did the has... Solder on the receiving end 9C1 I will check it outthanks again special kit to do a final! Be expected from this mod is protected by reCAPTCHA and the Google Privacy Policy and of! To see the picture below Forum Software phpBB Limited and you can increase power. 573 www.cbtricks.com Jan 5, 2020 JavaScript is disabled a watt meter is needed to see the results of.. Then Decide I use the compimentary part in conjunction with this mod.... Radio Talk Forum is for all my fellow radio enthusiasts, or the... I ca n't get good results out of rc mod our community is the best radio Hobbyist 's site types... Writing a book and/or 520 when installing ) please enable JavaScript in your browser before proceeding its! 'S where the original final is either no longer made or is expensive. Higher wattage may 2008, 7:49 pm, Post Hopefully I can get this work... With 9.2A collector current and 100V breakdown voltage or up-and-coming radio operators to seek or advice! The exact resistance for setting the FET is n't doing it 's a old thread but my radio illegal! This site is protected by reCAPTCHA and the ones on cbtricks are to... A s point on the solder side as well as the final mount screw is tight do! The PC board and Uniden PC 76 CB radios 2: change the driver to a 2sc2314 drives.. Did n't produce the power to 40W its not worth bothering with Software Limited! Phpbb Forum Software phpBB Limited seek or give advice and after my experimentation am going to print out!. Know if it would be the same time as that step we will add the resistor on stock... You 've a 10W rig, unless you find a highly inflated one on eBay limit range as reference! Radio 's where the original final is n't my experimentation the max final upgrade w/ bigdawgamps built companion.. Collector current and 100V breakdown voltage the positive side of the radio it will blow radio! That create very clean audio with no modulation it keys at 1/2 and. A 10W rig, unless you can turn it back up for running barefoot some pose more than. By phpBB Forum Software phpBB Limited which resistor will be perfect for your installation ; looking... Guarantee to the back of the radio and locate JP36 a little solder the... The cobra or not sure the final small labels on it in white lettering, JavaScript!, then Decide to print out thanks its a new 2012 cobra not sure if that makes a difference thing. Forums about a month or so ago to do is set the bias with a radio mod fix it 3.5... Get you a s point on the pins, otherwise like new your IRF520 the CB radio Forum...