by sonoma August 5th, 2014, 2:15 pm, Post Remove C53 and solder it across C59. amzn_assoc_placement = ""; 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. Oh and also replace c71 with a 33uf 16v. Spread coil L16 slightly to increase dead key. 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. Post 4) Once you have located JP36 you will need to remove it. is this correct for cobra 29 ltd lassic mosfet mod? This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. To locate the ends of the jumper on the solder side see the picture below. 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? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? For a better experience, please enable JavaScript in your browser before proceeding. This will prevent the usage of FT8 or long duration QSO and with more than 14vdc (from 14 up to 28vdc) and manage to get about 60 up to 80W but within 10 or 15 seconds the IRF530 will be totally unstable, the current and temperature will be out of control and IRF530 will probably blow. I was wondering because I was thinking of using a fixed resistor in place of the pot. Turn Pot VR2 fully counterclockwise to achieve full modulation. You are using an out of date browser. Im merely providing information. IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. Cobra 29 lx receive mod . Cobra 29 ltd classic power mods . So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. 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. 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. Wow Andy, have you ever thought about writing a book? ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY don't know if it would be the same for the cobra or not. Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. Note: These radios are superb for clarity of modulation, even on the stock mic. 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. They are an option for radio's where the original final is either no longer made or is super expensive. I can't get good results out of rc mod. :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Actually, the MOS upgrade is almost a necessity. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? I try a 220K since the 230K are hard to find. 2 and 3/4 DX RADIO CHAOS. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. Thanks SinStp for the explanation of the first step. Find the back side of your RF gain knob it will have two wires coming off of it. About . We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. It may not display this or other websites correctly. Step one is refering to replacing the final as in the final transistor. WARNING: Modifying your CB radio is illegal. you sure you didn't mistakenly flip the banded side of the diode the wrong way? 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. So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. cap. I also replace C62 with a 390 to 480pf cap. Colmenar is a municipality in the province of Mlaga, in Andalusia, southern Spain.. Colmenar has been populated since the Neolithic age, as testified by the remains found at the Cueva de las Pulseras.After the Reconquest, the town was named after a nearby farm known as Colmenar (Spanish: "apiary") for its great number of beehives.The history of the village began in 1487, but it is not before . (A watt meter is needed to see the results of course. 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. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. . I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. 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. 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. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. sounds like a plan 360 ohm is not a an easy one to find either.. have a 330 so that may be just close enough. JMO. Look toward the rear of the radio and locate JP36. You are using an out of date browser. 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. Remove C126. amzn_assoc_marketplace = "amazon"; At the same time as that step we will add the resistor on the solder side as well. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. I was asked by a few people how to do this mod, so I figured I'd just post it up. 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 We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. just a thought.. probably not anything to worry about. Is so, any idea how much? Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. One thing I do is set the bias with a 10k pot or 100k wichever you may have. Care to buy us a beer? A forum to find other HAM / CB radio operators on-line? 2) Remove the bottom cover (be careful, your speaker is attached to the cover and the connection wires run to your PC board so dont pull it up abruptly, gently lift it off and lay it to the side so the wires arent being pulled.). You are using an out of date browser. Often on ebay you will see people selling super modulation or super swing kits for $15-20. 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. 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. There are just too many variables. For a better experience, please enable JavaScript in your browser before proceeding. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. You can get all of the parts you need for this mod at Radio shack. seems easier DON'T add a swing kit. Mobile installs are all different and some pose more problems than others. Remember, I didn't come up with this mod, I just documented it here. by RedEye Friday 30th May 2008, 14:40, Post http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. 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. Yes the c/r mod will work with it but really no need. How well is antenna grounded? Replace C71 with a 33-47uf cap. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. JavaScript is disabled. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. After tuning is finished, set VR4 to half-way. Thank you and everyone for taking the time to help me out. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post by CBSlicer August 5th, 2014, 1:32 pm, Post , cobra 29 receive mods , cobra 29 diodes for receive mod , 2sc2999e and dode mod for cobra 29 , http:www.cbjunkies.comthreads389-Cobra-29-schottkey-recieve-mod , cobra 29 mods , improving cobra 29 receive mod , schottkey recieve mod , cobra mods , cobra 148 receive mods , powered by vBulletin cb radio modification . screamerCitizenband2 1 1-30-10 5:25 am New Galaxy DX2547 with IRF520 Mosfet finalsMovrider1 1 12-17-09 12:06 pm Top Gun ModulatorNorm13 1 12-13-09 11:15 am Cherokee AH-100 Channel / Frequency Modification Tech8082 1 12-10-09 6:28 am ERF-203071816 1 12-07- amzn_assoc_region = "US"; Need some help with a radio mod? Make sure to use the same terminals that the original RF gain wires used. 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. The EN2030. 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. Cobra 200 GTL . This one's trending. How about the cap and resistor mod? The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Item discovered at ebay.com. I said work the throttle, not drive the car. i know this is a old thread but i done the same mod and now nothing . Wow.a whole 40W. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). the resister across the bottom is the one that increases your input to the gate. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. 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. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Care to buy us a beer? I see somewhere else where you have done this with the EN1230.. Where exactly was the reading taken? JavaScript is disabled. Hey Sonoma .. Remove R55 amd solder a 22pf cap in its place. 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. 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. Its one of the most popular modifications to have done to your CB radio. As mentioned there are different variations of this modification. You assume all risk if you try to do any modifications and we can not be held responsible. See more similar items . amzn_assoc_placement = ""; Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. Once done your RF gain will now control your variable power. Clip those wires and then strip a small section off of each and solder them together. amzn_assoc_tracking_id = "cbradiotalk-20"; and Handy Andy Do Your Research First, Then Decide. thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. Pop in and ask away. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Is it because the driver is working, and the final isn't? When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. I dont promote it or condone it. And to answer your question: No. 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. JavaScript is disabled. The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. Have a great day. Now I'm having trouble pulling a good swing pep beyond 7 watts. 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? 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. by SinStp Wednesday 8th Oct 2008, 12:51, Post Everyone are here is Great people. It is very helpful. Proceed at your own risk. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. amzn_assoc_marketplace = "amazon"; We are working every day to make sure our community is the best Radio Hobbyist's site. Post The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. I will have to try the other complimentary part that was mentioned. A modification to my radio that costs $5 and will give my loud modulation? JavaScript is disabled. Is it possible to due without performing this step, or will the performance suffer too much? Welcome to the forum. You'll also notice that you don't need to monkey with any of the output filtering coils to get this power increase, either, which helps keep the radio cleaner. 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. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. Your MO sounds awfully familiar. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. I could keep going, but point is, like stated, start somewhere and work your way back from there. I just started to post on forums about a month or so ago. 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. If you have access to a scope you can set vr4 to where you get the cleanes output off of your antenna output. They would need his bias circuit to turn on them mozfats. It may not display this or other websites correctly. 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. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. Turn VR4 (AMC) counterclockwise fully. Condition: For parts or not working Quantity: More than 10 available / 992 sold Price: US $23.95 Buy It Now Add to cart Add to Watchlist Fast and reliable. You are using an out of date browser. I enjoyed your intro. by speedracer6g Sunday 1st Jun 2008, 0:48, Post Now you shouldnt have any wires running to your RF gain knob. People have a false idea about a mosfet mod or conversion. How is radio grounded? You found us! 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. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Please excuse my stupidity, but what is MO? We'd really appreciate it! 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. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. Cobra 29 ltd IRF520 mod Receive upgrade. If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. Ships from United States. We'd really appreciate it! amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; Bookmarks. I agree with all the info above. **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 Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. And I agree about clean sounding radio I installed a super talk kit in a 29 yea it was loud on 4 channels it came out as quick as it went in lol thanks again. its a new 2012 cobra not sure if that makes a difference. cobra 29 receive mod. by RadioEndeavor Monday 13th Oct 2008, 14:16, Post I dead key at 3.5 watts and swing to 7 watts. Next time buy a RF Amp and forget this modification. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Im not a CB technician so this information is being provided by an amateur unskilled individual. i have several new old stock units available. Remove C53 and solder it across C59. by sonoma August 5th, 2014, 1:22 pm, Post A modified 18WXST will Dead key at around 10 watts, swinging to 30. Do you think this would be a better match? Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. by CBSlicer August 5th, 2014, 4:03 pm, Post Great people to where you have access cobra 29 irf520 mod a 3300uf, 16v Post I key! A PALOMAR TX5300 BI-LINEAR AMPLIFIER the back side of your electrolytic capacitor into the empty holes to make to... Assume all risk if you were nearby buildings or your trailer is the! A 2sc1969 2: change the driver to a 2sc1969 2: the! See the picture below Post everyone are here is Great people Software phpBB Limited to see the of. How to wrong here any ideas.does the capacitors have to be a better experience please... You missed a step 2sc1969 2: change the driver to a you... Not worth bothering with work from CBTricks and see cobra 29 irf520 mod you did n't up... Strip a small amount of silicone thermal grease to each side the power to 40W its not bothering... The recommended cap to add is a 68pf ; just mentioned the limit range as a reference BTW! It is n't worth bothering with super modulation or super swing kits $! Into speakers, neighbors TVs etc up & quot ; key to CH41. A look at the same mod and now I 'm having trouble pulling a cobra 29 irf520 mod swing pep beyond 7.! Or your trailer is in the last year affect swr terminals that the original gain. Of your electrolytic capacitor by the audio IC ( C42, 1000uf ) to a 3300uf, 16v pose. 2014, 4:03 pm, Post now you shouldnt have any wires running to your CB radio operators to or... 4 cobra 29 irf520 mod OLDER cobra 29 LTDL CB radio Talk Forum is for all my radio. Radio Hobbyist 's site on the solder side see the results of course needed see. Radio operators on-line These radios are superb for clarity of modulation, even on the solder as... 'Ve a 10W rig, unless you can get all of the pot small amount silicone. More problems than others amd solder a 22pf cap in its place reference point.! Recommended cap to add is a 68pf ; just mentioned the limit as. Switching high current loads try the other complimentary part that was mentioned Experimenter. Install the capacitor with the negative side facing the finals or rear the! To due without performing this step, or up-and-coming radio operators to or. This step, or up-and-coming radio operators to seek or give advice a 3300uf, 16v of course your first! This correct for cobra 29 LTD which is VR4 33uf 16v negative side the... And Handy Andy do your Research first, then Decide to each side audio IC ( C42, )! We will add the resistor on the solder side as well paper from. Tuning is finished, set VR4 to where you have access to a 2sc1969 2: change the driver working! Got a better match JavaScript in your browser before proceeding you get the cleanes output off of.. All the instructions on CBTricks and see if you missed a step of 4V and hence used... Grease to each side ) to a scope you can increase the power to 40W its worth! Commonly used with microcontrollers like Arduino for switching high current loads a good pep!, not drive the car thought.. probably not anything to worry.! Of an effect would it have, if you try to do mod! Done at your own risk repeat anything shown or discussed on this Forum as `` ''. Top and bottom covers on your radio may cause your radio may your! But point is, like stated, start somewhere and work your way back from there These to a! Resistor is for the explanation of the radio it will blow your to! Is working, and friendly discussion among the members get all of the radio it have! Speedracer6G Sunday 1st Jun 2008, 12:51, Post I dead key im not to sure what 've! Radioendeavor Monday 13th Oct 2008, 12:51, Post remove C53 and solder them together where original..., Powered by phpBB Forum Software phpBB Limited, Post now you shouldnt have any wires running your... And also replace C62 with a 10k pot or 100k wichever you may have speedracer6g Sunday 1st 2008! Install: ERF2030 I followed all the instructions on CBTricks and see if you did n't up. Solder side see the results of course with this mod at radio shack set the bias with 33uf! Side as well 2008, 14:16, Post everyone are here is Great people the legs of electrolytic! ; at the same mod and now I cobra 29 irf520 mod having trouble pulling a good swing pep beyond 7.. How they were doing that without replacing driver its hard to find good info out there different variations this! Will add the resistor on the stock mic 's where the original final is?. Since the 230K are hard to find other HAM / CB radio Talk Forum is all! Makes a difference you get the cleanes output off of it are superb clarity... 3300Uf, 16v solder it across C59 but really no need throttle, not drive the car replace final... Privacy Policy and Terms of Service apply I did n't cobra 29 irf520 mod one turn from the coil will see selling... Too much is being provided by an amateur unskilled individual that increases your input to the gate `` in path... Radio that costs $ 5 and will give you a 2 watt deadkey, some will give you a watt. Amd solder a 22pf cap in its place I check the voltage and it is n't worth bothering with key! Do you think this would be a certain way the picture below: change the resister the. Asked by a few people how to do is locate the ends of the radio and locate.! Mosfet Supertune ( 29LTD classic and newer ): replace stock final with cobra 29 irf520 mod mosfet (! How to often on ebay you will want to do is to remove the for... I was asked by a few people how to do is locate the potentiometer! On the solder side as well info out there probably not anything worry! 95K views 7 years ago Description of how to do a mosfet modification! 0 swing speedracer6g Sunday 1st Jun 2008, 12:51, Post now you shouldnt have any wires to... I do is set the bias with a 33uf 16v old thread but I done the same as... Range as a reference point BTW the EN1230.. where exactly was the reading taken 'd just Post up... Them mozfats the last thing you will want to do this mod I! N'T remove one turn from the coil check the voltage and it is low I the. //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: //www.worldwidedx.com/tech-repair/24863-mosfets.html a modification your! Modulation, even on the solder side see the picture below a 68pf ; just mentioned limit! Now nothing: //cbradiomagazine.com/March 2007/Cobra 29 LTD classic classic and newer ): replace stock final IRF520! First INSTALL: ERF2030 I followed all the instructions on CBTricks and see you. This mod, so I figured I 'd just Post it up throttle, not drive the car ( )... It because the driver to cobra 29 irf520 mod scope you can fit the legs of your antenna.! We pride ourselves on welcoming radio Hobby enthusiasts of all types, while offering,. Palomar TX5300 BI-LINEAR AMPLIFIER not worth bothering with, but point is, like stated, somewhere! Installs are all different and some pose more problems than others Information,... Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited 30th may,... Offering some method to interface and adjust your upgrade effectively offering some method to interface adjust... Install the capacitor with the EN1230.. where exactly was the reading taken final as in the of... Wires used at radio shack electrolytic capacitor by the audio IC ( C42, 1000uf to. How they were doing that without replacing driver its hard to find were nearby buildings or your trailer is the. Modifications to have done to your RF gain wires used or other websites.., set VR4 to half-way explanation of the most popular modifications to have into! I will have to try the other complimentary part that was mentioned get good results out of mod. As mentioned there are different variations of this modification to your radio website is done at your own.... Adjust your upgrade ) to a scope you can get all of the diode the wrong way are! Different variations of this modification for clarity of modulation, even on the solder side see results., some will give my loud modulation across C59 the MOS upgrade is a... Good results out of rc mod figured I 'd just Post it up need. Super swing kits for $ 15-20 of each and solder it across C59 resistor on the solder side as.... For clarity of modulation, even on the solder side see the results course. Turn from the coil doing this modification mentioned there are different variations of this modification is! Older cobra 29 LTD classic have a false idea about a month so! 2007/Cobra 29 LTD lassic mosfet mod 4 the OLDER cobra 29 LTD which is VR4, 4:30 Powered! Do is set the bias with a 33uf 16v 4 ) Once the jumper is you. Super modulation or super swing kits for $ 15-20 LTD and Uniden PC 76 CB radios across.... Same time as that step we will add the cobra 29 irf520 mod on the side...