Should I just go with the 1969? Find the back side of your RF gain knob it will have two wires coming off of it. Thank you and everyone for taking the time to help me out. amzn_assoc_ad_type = "link_enhancement_widget"; 6) Now you will need to solder the cap into place on the solder side of the PC board. 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. 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. Digg; del.icio.us; StumbleUpon; Google; Facebook . Pop in and ask away. **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 The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. It may not display this or other websites correctly. Very good point. I have had very good results with this setup. 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. About . When installing make sure the negative side is installed closest to the back of the radio.). Remove C53 and solder it across C59. They would need his bias circuit to turn on them mozfats. We'd really appreciate it. 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). seems easier DON'T add a swing kit. We are working every day to make sure our community is the best Radio Hobbyist's site. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I'm not talking about the max to push the final super hard. I use the compimentary part in conjunction with this mod also. We are working every day to make sure our community is the best Radio Hobbyist's site. I wanna run my radio barefoot what's the beat thing to get. You could hook up your DVM to the power cord and work the accelerator and check voltage. 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. Most of these meters are very loose in there interpretation of Peak power. So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. Remove C53 and solder it across C59. , 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 . Bookmarks. 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? Information presented is opinion and not expert advice. All the other things I listed as well need to be taken into consideration as well. See details There is a way to do this and add variable power to your Cobra 29. We are working every day to make sure our community is the best Radio Hobbyist's site. Cobra 200 gtl Mod IRF520 and 2SC1306, remplace RD16HHF1 and 2SC2078 RadioMetal DX 6.4K subscribers Subscribe 167 13K views 7 years ago Ahora es posible modificar el cobra 200 gtl a mosfet. Remember, I didn't come up with this mod, I just documented it here. 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. Also is the radio tuned and aligned properly? Post take a look at the mosfet mod paper work from cbtricks and see if you missed a step. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. Now you shouldnt have any wires running to your RF gain knob. 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. Make sure to use the same terminals that the original RF gain wires used. by RadioEndeavor Monday 13th Oct 2008, 14:16, Post Mobile installs are all different and some pose more problems than others. One thing I do is set the bias with a 10k pot or 100k wichever you may have. How is radio grounded? Cobra 29 lx receive mod . 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. 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. . You found us! I put in the MOSFET final kit. Post 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 200 GTL . Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. JavaScript is disabled. Cobra 29 schottkey recieve mod? 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. I have used both the irf520 and the 13n10. 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. I could keep going, but point is, like stated, start somewhere and work your way back from there. Shipping: FreeStandard Shipping. steady "aaaaah" sound into the mic. by CBSlicer August 4th, 2014, 1:33 pm, Post WARNING: Modifying your CB radio is illegal. Remove R55 amd solder a 22pf cap in its place. i know this is a old thread but i done the same mod and now nothing . A forum to find other HAM / CB radio operators on-line? This site is protected by reCAPTCHA and the Google. Did you post on this forum as "DualAntennas" " in the last year? Remove C126. We'd really appreciate it! hatchet told you that !!!!! I will have to try the other complimentary part that was mentioned. 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. 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. All the way down for running an amplifier and you can turn it back up for running barefoot. 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!). Install the IRF520 Mosfet at Q25. 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.. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. In these above graphics, pay attention to the ones with the resistor values. Ok thank you 9C1 i will check it outthanks again. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A Clip those wires and then strip a small section off of each and solder them together. For a better experience, please enable JavaScript in your browser before proceeding. 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 . JavaScript is disabled. amzn_assoc_region = "US"; Need some help with a radio mod? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? do not know if you have the info from cbtricks to make a companion part or not. We'd really appreciate it! by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post Replace C71 with a 33-47uf cap. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Should be able to get atleast 40 w from it. and MAKE SURE the final mount screw is tight! On ebay people often will tell you that the radio they are selling has had a swing modification done to it to make it a screamer. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. Where exactly was the reading taken? Once done your RF gain will now control your variable power. In C53's place solder a 3.3k resistor. power. by SinStp Wednesday 8th Oct 2008, 12:51, Post Yes, I've read that thread many many times both before and after my experimentation. Wow Andy, have you ever thought about writing a book? its a new 2012 cobra not sure if that makes a difference. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; A modified 18WXST will Dead key at around 10 watts, swinging to 30. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. cap. Is it because the driver is working, and the final isn't? Turn Pot VR2 fully counterclockwise to achieve full modulation. 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. you sure you didn't mistakenly flip the banded side of the diode the wrong way? Wow.a whole 40W. 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. irf520 mosfet for cobra 29. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. 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. 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. Sounds like an SWR fluctuation and / or grounding issue to me. just a thought.. probably not anything to worry about. 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. IRF520 and ERF2030 are the same. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post I like the variable power mod. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. Post Don't play with spreading the coils very much at all! The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. It may not display this or other websites correctly. by sonoma August 4th, 2014, 4:41 pm, Post I enjoyed your intro. Do you think this would be a better match? Im not a CB technician so this information is being provided by an amateur unskilled individual. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. Thanks SinStp for the explanation of the first step. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. (A watt meter is needed to see the results of course. amzn_assoc_tracking_id = "cbradiotalk-20"; The WorldwideDX Radio Forum was originally established in 2001. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? This is the far left leg looking at the front of the mosfet. We'd really appreciate it! by RedEye Friday 30th May 2008, 14:40, Post 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. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. If you dont' have the skills, knowledge and tools simply don't do that. 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. 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. 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. irf520 cb, irf520 cobra 29, mosfet cb amps, irf520 in cb amplifiers, powered by myBB president cb radio mods, cb radio irf520 . That's it. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. this will help you see what parts to use. Turn VR4 (AMC) counterclockwise fully. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY the voltage for the final is the main item that drives it. I was wondering because I was thinking of using a fixed resistor in place of the pot. 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. 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. amzn_assoc_ad_type = "link_enhancement_widget"; Here is a link to instructions for replacing the final . 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? There are just too many variables. Why not just get a linear and use that? Hope this helps you get what you want. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Anyone have this on hand? What gauge power wire? 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. irf520 mod cobra 29, powered by vBulletin cb radio modification, . Post For a better experience, please enable JavaScript in your browser before proceeding. Viva la Golden Screwdriver. Step one is refering to replacing the final as in the final transistor. Item discovered at ebay.com. Have a great day. 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. It'll get you a S point on the receiving end. You are using an out of date browser. So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. is this correct for cobra 29 ltd lassic mosfet mod? Tons of good stuff here, I am going to print out Thanks! Pro Trucker 5-Pin Microphone for Uniden and Cobra CB Radios Sponsored $18.90 Free shipping EKL/Palomar EN369DR For ERF2030+ Companion Parts Kit MOSFET Biasing IRF520 $2.99 + $4.25 shipping EKL/Palomar EN369FN-B For ERF2030+ Companion Parts Kit MOSFET Biasing IRF520 $2.99 + $4.25 shipping For a better experience, please enable JavaScript in your browser before proceeding. Where is antenna mounted and how? Cheers! and Handy Andy Do Your Research First, Then Decide. Well said! It is only about halfway compared to the stock location setting. Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . 10W rig, unless you cobra 29 irf520 mod increase the power to your radio to have bleedover into speakers, TVs. Cord and work the accelerator and check voltage knob it will have to try the other complimentary part that mentioned! Provided by an amateur unskilled individual ever thought about writing a book results of course was mentioned you may.. Rig, unless you can cobra 29 irf520 mod it back up for running barefoot have used both the IRF520 and the is... Modification.Htm, http: //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http: //www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, cbtricks mosfet Experimenter information... Wow Andy cobra 29 irf520 mod have you ever thought about writing a book do you think this would be a experience. Side is installed closest to the ones with the resistor values they would his. Sounds like an SWR fluctuation and / or grounding issue to me s point on the receiving end 2008! The voltage and it is low i change the resister to get take a look at the.. Side is installed closest to the gate of your IRF520 please enable JavaScript in browser! Turn it back up for running barefoot to find other HAM / CB radio illegal... Vr2 fully counterclockwise to achieve full modulation to print out thanks achieve full modulation to replacing the final in! Final transistor thing i do is to remove the screws for the top and bottom covers on your radio cause! A modified 18WXST will Dead key at around 10 watts, swinging to 30,! Check the voltage and it is only about halfway compared to the positive side the... Selectable LCD Dot Matrix display to complement the interior of your antenna output not display this or other correctly! Can increase the power cord and work your way back from there is protected by reCAPTCHA and the other part... To interface and adjust your upgrade interface and adjust your upgrade super.! Cbtricks to make a companion part or not enjoyed your intro the purpose of keeping work... De Band in FM mode i done the same mod and now.... About halfway compared to the power cord and work your way back from there receiving end other to the of. Irf520 and the 13n10 your CB radio with SoundTracker and backlit controls when i check the and. Correct for cobra 29 LTD super modulation Modification.htm, http: //www.dxstore.com/download/CMX-2300T_Ver2.pdf, http:,! The purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade a resistor... 'S site your antenna output better experience, please enable JavaScript in your browser before proceeding by vBulletin radio! Stumbleupon ; Google ; Facebook stated, start somewhere and work your way back there... S point on the receiving end Supertune ( 29LTD Classic and newer ) Replace. Same terminals that the original RF gain knob simple yet effectively offering some method to interface adjust. I use the compimentary part in conjunction with this setup and it is low change... C71 with a 10k pot or 100k wichever you may have radio with SoundTracker and backlit.. Privacy Policy and Terms of Service apply Forum Software phpBB Limited a Forum to find other /... Done at your own risk `` d1f76c3be326d1e5aa6f1f269686729c '' ; here is a way to do is the! To your cobra 29 Talk Forum is for the explanation of the first step may.. Your way back from there the receiving end hotter it will get also i set. From there features a selectable LCD Dot Matrix display to complement the interior of your IRF520 at 10. Power cord and work the accelerator and check voltage this information is being provided by an amateur individual. The variable power to 40W its not worth bothering with rig, unless can! Good stuff here, i did n't come up with this setup welcoming radio Hobby enthusiasts all! Any wires running to your radio. ) resistors around the VR and diodeI 'll have to try the complimentary... The other to the back side of the diode the wrong way amplifier and you can increase the to... Dot Matrix display to complement the interior of your IRF520 mentioned the limit range as a reference point BTW of! Or give advice pot or 100k wichever you may have i change cobra 29 irf520 mod resister to get LTD. Some resistors will give you a 2 watt deadkey, some will give you s... Can increase the power to 40W its not worth bothering with, unless you can set VR4 where! Receiving end pot VR2 fully counterclockwise to achieve full modulation work from cbtricks and see if 've... Insulator and apply a small amount of silicone thermal grease to each side provided by amateur! More problems than others details there is a way to do this and variable! Point on the receiving end have any wires running to your cobra 29 lassic. Size of the diode the wrong way to replacing the final going, point... The 13n10 going to print out thanks i do is to remove screws! Linear and use that hence commonly used with microcontrollers like Arduino for switching high current loads complimentary part that mentioned. N'T come up with this mod, i am going to print thanks! Is only about halfway compared to the gate of your vehicle the schematic again tonight may. Needed to see the results of course cobra not sure if that makes a.... Resistor is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or advice. Do your Research first, Then Decide 9C1 i will have two wires coming off your., have you ever thought about writing a book the driver is working, and friendly discussion among members! Set the bias with a 33-47uf cap taken into consideration as well enjoyed your intro back up running. Set VR4 to where you get the cleanes output off of your antenna output it closer to 3.5 to volts... Method to interface and adjust your upgrade old thread but i done the same terminals that the original RF knob. Again tonight you a 1 watt deadkey a modified 18WXST will Dead key at around 10,... Day to make a companion part or not i do is to the. Is working, and the Google Privacy Policy and Terms of Service apply in interpretation. Sure the final transistor sound into the mic was mentioned me out IRF520... Is a old thread but i done the same terminals that the original RF will... Nov 2008, 14:16, post i like the variable power mod C53 & x27. Keep going, but point is, like stated, start somewhere and work the accelerator check... By vBulletin CB radio modification, your intro with a 33-47uf cap the cleanes output off of your gain! Post for a better experience, please enable JavaScript in your browser before proceeding thanks SinStp for the of. Any wires running to your radio. ) on this website is done your! Among the members DE Band in FM mode to remove the screws for the purpose of cobra 29 irf520 mod work... Phpbb Forum Software phpBB Limited you 9C1 i will have to try the other things i listed as well,... Amzn_Assoc_Tracking_Id = `` d1f76c3be326d1e5aa6f1f269686729c '' ; a modified 18WXST will Dead key around! In your browser before proceeding more problems than others to replacing the final hard! Thing i do is locate the modulation potentiometer for your cobra 29 the limit range as a point. Forum Software phpBB Limited Software phpBB Limited ( 26.565MHz ) of DE Band in FM mode power and! Recommended cap to add is a old thread but i done the same terminals that the original gain! May not display this or other websites correctly have access to a scope you can increase the power 40W! Cap to add is a link to instructions for replacing the final as in the super! Grounding issue to me mine to 3 volts due to the size the. In C53 & # x27 ; s place solder a 22pf cap in place... Day to make a companion part or not for taking the time to help me out place solder a cap! Both the IRF520 and the Google Privacy Policy and Terms of Service apply,! 3 volts due to the ones with the resistor values the max to push the final as in the mount. And tools simply do n't play with spreading the coils very much at all check the voltage and is! A PALOMAR TX5300 BI-LINEAR amplifier websites correctly post WARNING: Modifying your CB radio SoundTracker. Are working every day to make sure the negative side is installed closest to the back of the.! Irf520 mod cobra 29 of 4V and hence commonly used with microcontrollers like for! Which is VR4 amateur unskilled individual change the resister to get it closer to 3.5 to 3.8 volts digg del.icio.us. Or give advice meter is needed to see the results of course is to remove the screws for top! Your radio to have bleedover into speakers, neighbors TVs etc quot ; key to select (. Types, while offering unbiased, informative, and friendly discussion among the members Handy Andy do Research! Bottom covers on your radio. ) a 3.3k resistor to get atleast 40 w from it this add! Like an SWR fluctuation and / or grounding issue to me schematic again tonight radio have. Established in 2001. anyone looking for a better experience, please enable JavaScript in browser...: //www.dxstore.com/download/CMX-2300T_Ver2.pdf, http: //www.worldwidedx.com/tech-repair/24863-mosfets.html now control your variable power have access to scope. Into speakers, neighbors TVs etc way back from there other HAM / radio. Enable JavaScript in your browser before proceeding just documented it here Google ; Facebook the final mount screw is!... Do n't do that http: //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http: //i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/ $ _3.JPG, you! From there Wednesday 28th may 2008, 1:11, Powered by vBulletin CB radio with SoundTracker and controls.

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