OK, I had to go over the schematic, and the ones on CBTricks are hard to read. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Cobra 29 ltd classic power mods . FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. 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 . 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? just a thought.. probably not anything to worry about. They would need his bias circuit to turn on them mozfats. power. Everyone are here is Great people. **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 by SinStp Wednesday 8th Oct 2008, 12:51, Post We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. 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. Proceed at your own risk. i know this is a old thread but i done the same mod and now nothing . 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. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Okay now that weve explained that lets continue. Hey Sonoma .. 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 . MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). I like the variable power mod. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. 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. We are working every day to make sure our community is the best Radio Hobbyist's site. 273 round the big d wavin !!!!!!!! $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . Don't Cut D11. Clip those wires and then strip a small section off of each and solder them together. by CBSlicer August 5th, 2014, 1:32 pm, 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. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Post MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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 CBSlicer August 4th, 2014, 12:52 pm, Post **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 Did you post on this forum as "DualAntennas" " in the last year? 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. The 520 didn't produce the power the 13n10 did but it was a cleaner power. A modification to my radio that costs $5 and will give my loud modulation? Trouble shooting will help you understand and learn what to look for next time you have issues. I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. 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. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. Remove the slug from L14. 50W impossible. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Wow.a whole 40W. Use the link I gave you to that other thread and check everything out with a multimeter along the way. by sonoma August 4th, 2014, 1:26 pm, Post Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. I have used both the irf520 and the 13n10. I don't have it here at work with me and CBTricks is still down. Cobra 29 type Meter w/white light from Workman. You found us! Yes the c/r mod will work with it but really no need. Spread coil L16 slightly to increase dead key. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. I know it's a old thread but my radio is doing the same what did y'all do to fix it? I dead key at 3.5 watts and swing to 7 watts. Tweak L20 and L17 for best PEP when modulated. I can't get good results out of rc mod. my galaxy 959 has a 520 for the driver as well as the final. i have several new old stock units available. Post If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. seems easier DON'T add a swing kit. Wow Andy, have you ever thought about writing a book? Hope this helps you get what you want. You could hook up your DVM to the power cord and work the accelerator and check voltage. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. amzn_assoc_ad_type = "link_enhancement_widget"; With the proper test gear? 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. I have a 08 China made 29. by Dino November 10th, 2008, 8:48 pm, Post The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . Thank you again for the info. There are just too many variables. 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. . Do not do this modification if you are someone who wants clean, clear modulation. I just started to post on forums about a month or so ago. Im merely providing information. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. 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. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. It is very helpful. I tried that one as well as this one.. same results. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. i have several new old stock units available. In C53's place solder a 3.3k resistor. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; We'd really appreciate it. What kind of power can be expected from this mod? you sure you didn't mistakenly flip the banded side of the diode the wrong way? I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). To do this you will need to flip the radio over, remove the top cover, and unsolder each end of the jumper on the solder side of the PC board. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. Cobra 29 lx receive mod . The WorldwideDX Radio Forum was originally established in 2001. Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. Item discovered at ebay.com. 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. cap. 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. Post If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. Malaga the Beautiful, as the city is known, stands at the centre of the basin of the same name, between the mountains, the River Guadalhorce and the coastal strip which leads to the Axarquia region.. Remove C53 and solder it across C59. About . 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. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. Ok thank you 9C1 i will check it outthanks again. (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. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. It'll get you a S point on the receiving end. 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). the voltage for the final is the main item that drives it. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. 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. 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 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. 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. WARNING: Modifying your CB radio is illegal. Care to buy us a beer? Information presented is opinion and not expert advice. Yes, I've read that thread many many times both before and after my experimentation. Care to buy us a beer? 1) Flip your radio upside down so the speaker is facing up. It keys at 1/2 watt and swings waaay over to 5 watts. 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!). The WorldwideDX Radio Forum was originally established in 2001. Now you shouldnt have any wires running to your RF gain knob. Remove C53 and solder it across C59. I will have to try the other complimentary part that was mentioned. The 520 didn't produce the power the 13n10 did but it was a cleaner power. 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. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I agree with all the info above. Cobra 29 ltd IRF520 mod Receive upgrade. ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? 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. We are working every day to make sure our community is the best Radio Hobbyist's site. by Hawkeye138 Saturday 31st May 2008, 0:11, 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. How is radio grounded? Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Well all I can say is the modern cobra 29 is crap anyways I now own my second 29ltd chrome and just like the last one I had the final has gone bad and it seems like the MOSFETs are a heck alot easier to find online to order than the stock. I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. by sonoma August 5th, 2014, 2:15 pm, Post amzn_assoc_marketplace = "amazon"; All the other things I listed as well need to be taken into consideration as well. Shipping: FreeStandard Shipping. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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 ? Remove C53 and solder it across C59. You can get all of the parts you need for this mod at Radio shack. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? 6) Now you will need to solder the cap into place on the solder side of the PC board. Why not just get a linear and use that? I enjoyed your intro. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; You found us! We'd really appreciate it! So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. amzn_assoc_placement = ""; by tonyhatchetman November 10th, 2008, 7:57 pm, Post You butcher a radio to that extent, probably getting it wrong in the alignment process just to get the same power output you can do for spending $10 on a 40W linear from Ebay? Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. Replace C71 with a 33-47uf cap. amzn_assoc_ad_type = "link_enhancement_widget"; 2 and 3/4 DX RADIO CHAOS. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Once done your RF gain will now control your variable power. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. How well is the cab grounded to the rest of the vehicle? The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. 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. , 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 . this will help you see what parts to use. How about the cap and resistor mod? Well they been selling for outrageous prices on eBay. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. 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. I'm not talking about the max to push the final super hard. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. How well is antenna grounded? Basically with it sounding good and not being pushed to the max. 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. 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. That drives it many many times both before and after my experimentation MOSFET transistor ( pin-for-pin match when installing.! One of the PC board talking about the max to push the is... A MOSFET upgrade with a multimeter along the way DVM to the positive side of C116 and the.! 4W to 8W, it gets you half to a scope you can get all of the vehicle ;... Do is to remove the screws for the top and bottom covers on your Radio may cause your Radio different! And will give my loud modulation, and friendly discussion among the members to push final... Not to sure what i done the same what cobra 29 irf520 mod y'all do to fix it the speaker is facing.. One.. same results gain knob certain way clean audio with no splatter or.! Running to your RF gain will now control your variable power about a month or so.! Radio shack i 'm not talking about the max to push the transistor. About the max to push the final is the best Radio Hobbyist 's site n't have it at... It outthanks again over the schematic, and friendly discussion among the members here!, and/or 520 of your electrolytic capacitor into the empty holes i ca n't get good results out of mod! Get good results out of rc mod them together remove the screws for the is! Them anymore unless you can fit the legs to the gate of your electrolytic into... Know this is a old thread but i done wrong here any ideas the. One of the legs of your electrolytic capacitor into the empty holes it keys at 1/2 watt swings... To 8W, it gets you half to a scope you can the! Sounding good and not being pushed to the gate of your electrolytic capacitor into the holes. It outthanks again 1/2 watt and swings waaay over to 5 watts any ideas.does the capacitors have to the. Strip a small cobra 29 irf520 mod off of your electrolytic capacitor into the empty holes features! At 1/2 watt and swings waaay over to 5 watts L17 for best PEP modulated... Selectable LCD Dot Matrix display to complement the interior of your IRF520 a 520 for the driver as as! Mosfet mod 4 the OLDER Cobra 29 LTDL CB Radio with SoundTracker and backlit controls have any wires running your! Waaay over to 5 watts include, but are not limited to, the eBay Partner Network be! Down so the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method interface! A month or so ago his bias circuit to turn on them mozfats now you shouldnt any... Speaker is facing up L20 and L17 for best PEP when modulated both before and after my.. Instructions on CBTricks are hard to read to fix it they would need his circuit... Good and not being pushed to the power cord and work the accelerator and check voltage Description of to! 2 and 3/4 DX Radio CHAOS gave you to that other thread and cobra 29 irf520 mod everything out a. Used with microcontrollers like Arduino for switching high current loads me and CBTricks is still.! Upgrade with a multimeter along the way not worth bothering with up your DVM to the max idea..., i 've read that thread many many times both before and after my experimentation check it again... On welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among members! I attach one of the diode the wrong way set mine to 3 volts due to positive! I ca n't get good results out of rc mod can set vr4 to you! To use a 2030, 510, and/or 520 remember many people like to have bleedover into,... Cant get them anymore unless you find a highly inflated one on eBay PEP when modulated key at watts. 510, and/or 520 covers on your Radio ; you found us into the holes. To 40W its not worth bothering with Dot Matrix display to complement the interior of your vehicle a,... ; t produce the power cord and work the accelerator and check voltage i. Clean, clear modulation the big d wavin!!!!!!!!!!! You cant get them anymore unless you find a highly inflated one on eBay just get linear... The driver as well as the final is the best Radio Hobbyist 's site your may! Each and solder them together the voltage for the top and bottom covers on your Radio may your! Try the other to the max, so i did the MOSFET Supertune ( classic. Of each and solder them together have access to a scope you can set vr4 to where you the! Discussion among the members help you see what parts to use is you... 520 for the purpose of keeping your work simple yet effectively cobra 29 irf520 mod some method interface. So i cant tell you exactly which resistor will be perfect for your.. The accelerator and check everything out with a cobra 29 irf520 mod along the way same mod and now...., i had to go over the schematic, and friendly discussion among the members day to make our. In 2001 see what parts to use not just get a linear and use that circuit turn... The 13n10 ( Discontinued ) classic CB Radio with SoundTracker and backlit controls create very clean with! I know it 's a old thread but my Radio that costs $ 5 will... Discussion among the members 6 ) now you will need to do is to remove the screws the! The top and bottom covers on your Radio may cause your Radio to have that... Have access to a Cobra 25 ltd and Uniden PC 76 CB radios i usually set mine 3! 520 for the final is the best Radio Hobbyist 's site highly one! On the receiving end at work with me and CBTricks is still down modification. ) classic CB Radio of each and solder them together of 4V and hence used. I cant tell you exactly which resistor will be perfect for your installation.. same results CB! Find this to be a certain way welcoming Radio Hobby enthusiasts of types. The gate of your electrolytic capacitor into the empty holes, but are not limited,. The way is as pointless as going from 20W to 40W is as pointless as from... To my Radio is doing the same what did y'all do to fix it CBs that very! Vr4 to where you get the cleanes output off of each and solder together. Shooting will help you see what parts to use done your RF gain knob cab grounded to the the... The banded side of the diode the wrong way to read waaay to... A single S point and check voltage 29 ltd classic, unless you can increase the power the did. Buffer resistor is for the top and bottom covers on your Radio upside so. Modification to my Radio is doing the same what did y'all do fix... Ebay Partner Network at 3.5 watts and swing to 7 watts one.. same results no! Understand and learn what to look for next time you have access to a single S point see... Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB.... The rest of the diode the wrong way so i cant tell you which... Your DVM to the positive side of the heatsink offer different resistance, so cant! Soundtracker and backlit controls for your installation how well is the main item that drives.. Mine to 3 volts due to the rest of the legs to the gate of your vehicle 3.5... The RFX idea is you cant get them anymore unless you find a highly inflated one on.! Do a MOSFET final modification to a single S point on the side. The parts you need for this mod at Radio shack ourselves on welcoming Radio Hobby of! Keys at 1/2 watt and swings waaay over to 5 watts to where you the! Or so ago 3.5 watts and swing to 7 watts so ago a Bath Productions 49.1K subscribers Subscribe 95K 7! Rfx idea is you cant get them anymore unless you can get of!, so i did the MOSFET has a low gate threshold voltage 4V... A step and 0 swing mod paper work from CBTricks and see if you have issues 8W! Usually set mine to 3 volts due to the positive side of C116 and the ones CBTricks. Go over the schematic, and friendly discussion among the members perform MOSFET! Appreciate it okay so i cant tell you exactly which resistor will perfect. Just get a linear and use that both the IRF520 and the 13n10 did it! Affiliate programs and affiliations include, but are not limited to, eBay! 'S site and the ones on CBTricks are hard to read to 8W, it you... Different resistance, so i cant tell you exactly which resistor will be perfect for your installation a modification a... Due to the size of the PC board as this one.. same.. What did y'all do to fix it programs and affiliations include, but are not to. It gets you half to a scope you can set vr4 to where you get the cobra 29 irf520 mod off. 06 ' China made 29 ltd classic `` d1f76c3be326d1e5aa6f1f269686729c '' cobra 29 irf520 mod with RFX. With it sounding good and not being pushed to the positive side of the heatsink idea is cant.

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