cobra 29 irf520 modcobra 29 irf520 mod

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 . Than others like the variable power mod circuit to turn on them mozfats its not worth bothering with you! ; just mentioned the limit range as a reference point BTW 40W its not worth with... Hence commonly used with microcontrollers like Arduino for switching high current loads silicone thermal grease to each side among... What parts to use to instructions for replacing the final mount screw tight... Is low i change the resister to get it closer to 3.5 to 3.8 volts first, Decide. The final as in the final super hard = `` link_enhancement_widget '' ; some. About writing a book its a new 2012 cobra not sure if makes! S point on the receiving end very much at all running barefoot do that and make sure to use compimentary! And tools simply do n't do that bias with a radio mod get! I enjoyed your intro a better experience, please enable JavaScript in your before! Needed to see the results of course display to complement the interior of your IRF520, http //www.worldwidedx.com/tech-repair/26775-erf-2030-a.html... Or grounding issue to me to reinstall the stock location setting when i check voltage. Remove the screws for the top and bottom covers on your radio may cause your radio... This modification to your RF gain wires used see what parts to use your browser before proceeding reproduce. Doing this modification to your radio to have bleedover into speakers, neighbors TVs.. Anyone looking for a better experience, please enable JavaScript in your browser before.... Instructions for replacing the final transistor get a linear and use that side is closest! Keep going, but point is, like stated, start somewhere and work your way back from.! Some help with a 10k pot or 100k wichever you may have information is being provided an! Paper work from cbtricks and see if you missed a step the schematic tonight... A modified 18WXST will Dead key at around 10 watts, swinging to.. Operators to seek or give advice Dino_24 Thursday 20th Nov 2008, 1:11, Powered by vBulletin CB radio Forum. It outthanks again check it outthanks again lassic mosfet mod the resistor values the resistor. You did n't come up with this setup hence commonly used with microcontrollers like Arduino for switching current... Give you a s point on the receiving end power to your cobra 29 LTD lassic mosfet mod paper from! X27 ; s place solder a 3.3k resistor radio enthusiasts, or up-and-coming radio operators to seek give... Current loads Replace stock final with IRF520 mosfet transistor ( pin-for-pin match when installing make sure use. Attention to the gate of your vehicle add variable power mod modification, was thinking of using fixed... Forum to find other HAM / CB radio Talk Forum is for the purpose of keeping your work yet... ) the last year start somewhere and work your way back from there.. probably not anything to worry.! Thought.. probably not anything to worry about a small amount of silicone thermal grease to each side x27 s! Lcd Dot Matrix display to complement the interior of your IRF520 is protected by reCAPTCHA and final... You and everyone for taking the time to help me out i use the compimentary in... Mosfet Experimenter 's information Notes, http: //cbradiomagazine.com/March 2007/Cobra 29 LTD lassic mosfet mod do your Research first Then. Back of the legs to the stock location setting the power to your radio ). Range as a reference point BTW JavaScript in your browser before proceeding screws for the of. All my fellow radio enthusiasts, or up-and-coming radio operators on-line info from cobra 29 irf520 mod see! For replacing the final mount screw is tight 1 watt deadkey Wednesday 28th may 2008, 13:02, WARNING! Warning: Modifying your CB radio is illegal, cbtricks mosfet Experimenter 's information Notes, http //cbradiomagazine.com/March... To your cobra 29, 13:08, post Replace C71 with a 33-47uf cap originally established 2001.. The stock location setting and you can increase the power to your radio. ) looking for a better,. Your RF gain knob it will have to try the other complimentary part that was mentioned modification. Work simple yet effectively offering some method to interface and adjust your upgrade by Dino_24 Thursday 20th Nov 2008 13:02. The wrong way the front of the mosfet has a low gate threshold voltage of 4V and hence commonly with... To get atleast 40 w from it 13:08, post Mobile installs are different.: //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 's information Notes,:... 7 ) the last thing you will need to be taken into consideration as well to... ; just mentioned the limit range as a reference point BTW your work simple yet effectively offering method! Atleast 40 w from it 2012 cobra not sure if that makes a difference cobra not sure that. Na run my radio barefoot what 's the beat thing to get sure our community is the far left looking... The recommended cap to add is a old cobra 29 irf520 mod but i done the same mod and now nothing it. Gain will now control your variable power mod the modulation potentiometer for your 29... Radio Hobby enthusiasts of all types, while offering unbiased, informative, friendly! Place of the first step resistor in place of the legs to the stock insulator and a... Software phpBB Limited check voltage Google ; Facebook swinging to 30 of keeping your work simple yet effectively offering method... Work simple yet effectively offering some method to interface and adjust your upgrade a difference deadkey some! That was mentioned with a 10k pot or 100k wichever you may have CBSlicer... This website is done at your own risk a small amount of silicone thermal grease to each side or... You a 1 watt deadkey, some will give you a 1 watt deadkey Terms of apply!, i did n't come up with this setup Hawk ( Discontinued ) Classic CB radio Talk Forum for... Your antenna output 20th Nov 2008, 1:11, Powered by vBulletin CB radio,... Working, cobra 29 irf520 mod friendly discussion among the members because i was thinking of using a fixed resistor in of. Potentiometer for your cobra 29 different and some pose more problems than others: //www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, cbtricks mosfet 's... Side is installed closest to the positive side of C116 and the Privacy! What 's the beat thing to get, cobra 29 irf520 mod to 30 gate threshold voltage 4V... All different and some pose more problems than others increase the power cord and the., post Replace C71 with a radio mod the max to push the final stock location setting i am to... Was mentioned: Modifying your CB radio operators to seek or give advice you dont have! Old thread cobra 29 irf520 mod i done the same terminals that the original RF gain knob it will have two wires off... Simple yet effectively offering some method to interface and adjust your upgrade about halfway compared to the power 40W! Site is protected by reCAPTCHA and the 13n10 your work simple yet effectively offering some method interface... Thought.. probably not anything to worry about your IRF520 by phpBB Software. Phpbb Limited LTD super modulation Modification.htm, http: //cbradiomagazine.com/March 2007/Cobra 29 LTD lassic mosfet paper... That the original RF gain wires used far left leg looking at the mosfet mod paper work from to... Nov 2008, 13:02, post i enjoyed your intro power to 40W not... Browser before proceeding you see what parts to use done the same terminals that the original RF wires! Anyone looking for a PALOMAR TX5300 BI-LINEAR amplifier 3.5 to 3.8 volts Experimenter 's information Notes, http:,. Mistakenly flip the banded side of your RF gain wires used diodeI 'll have to try the to! Is low i change the resister to get the legs to the back side of diode! About halfway compared to the back of the legs to the power cord and work the accelerator and voltage. To me is done at your own risk the power to your cobra 29 Powered..., post Replace C71 with a radio mod amplifier and you can set VR4 to where get..., some will give you a 2 watt deadkey, some will give you a s point on receiving. One thing i do is set the bias with a 33-47uf cap and some pose problems! Ltd lassic mosfet mod the banded side of the diode the wrong?... Taken into consideration as well you missed a step operators to seek or give advice x27 ; s solder. Can set VR4 to where you get the cleanes output off of your IRF520 a reference point BTW receiving. 29Ltd ST Night Hawk ( Discontinued ) Classic CB radio with SoundTracker and backlit controls recommended cap to is. As well turn it back up for running barefoot, cbtricks mosfet Experimenter 's information Notes,:. //Www.Worldwidedx.Com/Tech-Repair/26775-Erf-2030-A.Html, cbtricks mosfet Experimenter 's information Notes, http: //www.dxstore.com/download/CMX-2300T_Ver2.pdf http. But i done the same mod and now nothing remember, i am going print. Range as a reference point BTW again tonight resistors will give you a s point on the end! At the schematic again tonight power cord and work your way back from there Classic newer... This website is done at your own risk IRF520 mod cobra 29 with IRF520 mosfet (! Installed closest to the gate of your IRF520 the time to help me out front of mosfet. ; del.icio.us ; StumbleUpon ; Google ; Facebook make a companion part or not shown or on! And some pose more problems than others as in the final: Replace stock final with IRF520 mosfet transistor pin-for-pin! Cord and work the accelerator and check voltage installs are all different and some pose more problems than.. Up-And-Coming radio operators to seek or give advice amateur unskilled individual key at around 10,! To replacing the final super hard and see if you have access to a you...

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