cobra 29 irf520 mod
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. We'd really appreciate it. 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 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. Spread coil L16 slightly to increase dead key. You can get all of the parts you need for this mod at Radio shack. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. You will see that the board has a lot of small labels on it in white lettering. is this correct for cobra 29 ltd lassic mosfet mod? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Remove C53 and solder it across C59. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? With a cobra 25 I have seen slightly higher wattage. cobra 29 receive mod. It may not display this or other websites correctly. this will help you see what parts to use. 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. Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. 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. Yoda gets real pissed if he sees any spit coin in the till. I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Gently spread L13 and L12 and tweak the spreads for best PEP when modulated. Tweak L20 and L17 for best PEP when modulated. The first thing to know about this modification is that you dont need a special kit to do it. You are using an out of date browser. It keys at 1/2 watt and swings waaay over to 5 watts. by tonyhatchetman November 10th, 2008, 7:57 pm, Post Care to buy us a beer? 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. For a better experience, please enable JavaScript in your browser before proceeding. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . Clip those wires and then strip a small section off of each and solder them together. The 520 didn't produce the power the 13n10 did but it was a cleaner power. You could hook up your DVM to the power cord and work the accelerator and check voltage. It is very helpful. by Shadow Friday 28th Aug 2009, 20:30, Post Also is the radio tuned and aligned properly? RFX mods done. hatchet told you that !!!!! Remove C 61 and solder it across C62. 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. 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 A forum to find other HAM / CB radio operators on-line? Sounds like an SWR fluctuation and / or grounding issue to me. the voltage for the final is the main item that drives it. by CBSlicer August 5th, 2014, 1:32 pm, Post 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. Where is antenna mounted and how? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? amzn_assoc_ad_type = "link_enhancement_widget"; 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; You'll often hear people say on the radio that their Cobra 29 LTD has had a "swing mod" or "Super mod" done to it. Bookmarks. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; 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- Is it possible to due without performing this step, or will the performance suffer too much? 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 . 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 was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. In C53's place solder a 3.3k resistor. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Information presented is opinion and not expert advice. how about a update did you get what you want out of the radio. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. amzn_assoc_marketplace = "amazon"; by CBSlicer August 5th, 2014, 11:43 am, Post You are using an out of date browser. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. just a thought.. probably not anything to worry about. Proceed at your own risk. The WorldwideDX Radio Forum was originally established in 2001. The mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . Well they been selling for outrageous prices on eBay. 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. . i have several new old stock units available. Don't play with spreading the coils very much at all! Have a great day. Remove the slug from L14. So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. These are great radios to install in cars and pickup trucks, where space is at a premium, because they fit perfectly in a single DIN radio slot. That's it. 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. The WorldwideDX Radio Forum was originally established in 2001. by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. amzn_assoc_tracking_id = "cbradiotalk-20"; **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 Note: These radios are superb for clarity of modulation, even on the stock mic. 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. amzn_assoc_placement = ""; amzn_assoc_region = "US"; Need some help with a radio mod? The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post They would need his bias circuit to turn on them mozfats. So what exactly IS the famous super modulation modification? $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . Care to buy us a beer? Cobra 29 ltd IRF520 mod Receive upgrade. We'd really appreciate it! For a better experience, please enable JavaScript in your browser before proceeding. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. Look on cbtricks main page under mosfet experiment notes.. it's not very clear but it's there on the left hand side of the page. It'll get you a S point on the receiving end. cap. by RadioEndeavor Monday 13th Oct 2008, 14:16, Post Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. Okay now that weve explained that lets continue. thanks for your h. I think cbtricks.com has that mod step by step. I was asked by a few people how to do this mod, so I figured I'd just post it up. Cobra 200 GTL . Hi guys. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Tons of good stuff here, I am going to print out Thanks! Where exactly was the reading taken? 992 have already sold. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 8) Some people recommend adjusting L14 for maximum power, but in most cases after doing the modification your swing should be better than before and your radio much louder so trying to squeeze a couple of extra watts is not my recommendation. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. http://www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http://cbradiomagazine.com/March 2007/Cobra 29 LTD Super Modulation Modification.htm, http://www.dxstore.com/download/CMX-2300T_Ver2.pdf, http://i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/$_3.JPG. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. 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. 4) Once you have located JP36 you will need to remove it. dtbradio has an excellent mod posted up for the Cobra 29 which I have done several of with excellent results, unfortunately they don't have instructions for a 25. work with the mosfet? irf520 mod cobra 29, powered by vBulletin cb radio modification, . We are working every day to make sure our community is the best Radio Hobbyist's site. noizybuilt.com 04-22-2012, 11:00 AM #2 coolbreeze Heavy Hitter Chat with me Join Date Dec 2011 Location fredericksburg va Posts 199 Thanks 7 Thanked 40 Times in 31 Posts Downloads 0 Uploads 0 I will have to try the other complimentary part that was mentioned. What kind of power can be expected from this mod? In these above graphics, pay attention to the ones with the resistor values. See details 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. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. 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. Basically with it sounding good and not being pushed to the max. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 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 just started to post on forums about a month or so ago. Now I'm having trouble pulling a good swing pep beyond 7 watts. Ok thank you 9C1 i will check it outthanks again. (A watt meter is needed to see the results of course. All the other things I listed as well need to be taken into consideration as well. To locate the ends of the jumper on the solder side see the picture below. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. 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. Its one of the most popular modifications to have done to your CB radio. Remove R56 and in its place install a 470-ohm resistor in series with a common switching diode (1n914 or similar), with the banded end of the diode towards the front of the radio. Use the link I gave you to that other thread and check everything out with a multimeter along the way. We'd really appreciate it! Post It is only about halfway compared to the stock location setting. Trouble shooting will help you understand and learn what to look for next time you have issues. Thank you again for the info. by sonoma August 4th, 2014, 4:41 pm, Post What gauge power wire? You are using an out of date browser. We'd really appreciate it! Often on ebay you will see people selling super modulation or super swing kits for $15-20. I dead key at 3.5 watts and swing to 7 watts. do not think I would change to much at one time. This Will clean up the amc circuit and make it work better. Cobra 29 type Meter w/white light from Workman. Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. JMO. Shipping: FreeStandard Shipping. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. I was just trying to help you. Cobra 29 schottkey recieve mod? 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. For a better experience, please enable JavaScript in your browser before proceeding. , 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 . Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. by Hawkeye138 Saturday 31st May 2008, 0:11, Post Yes, you can/should still look at the tuning coil regardless. Remove C53 and solder it across C59. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. 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. See more similar items . Wow! 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. 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. In addition I make no guarantee to the validity of any of this info. Once done your RF gain will now control your variable power. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Step one is refering to replacing the final as in the final transistor. I have had very good results with this setup. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY Post When installing make sure the negative side is installed closest to the back of the radio.). Is so, any idea how much? Why not just get a linear and use that? i have several new old stock units available. 273 round the big d wavin !!!!!!!! I'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. This one's trending. Hey speedracer, do you know the exact resistance for setting the FET's bias? You assume all risk if you try to do any modifications and we can not be held responsible. This is the far left leg looking at the front of the mosfet. do not know if you have the info from cbtricks to make a companion part or not. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. 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!). Digg; del.icio.us; StumbleUpon; Google; Facebook . The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. 1) Flip your radio upside down so the speaker is facing up. 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? JavaScript is disabled. Should I just go with the 1969? Thanks SinStp for the explanation of the first step. Maybe someone else has it and can look at it. I also replace C62 with a 390 to 480pf cap. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. 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. Cheers! 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? That is, looking from the front of the radio twards the back. This site is protected by reCAPTCHA and the Google. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Cobra 29 ltd classic power mods . Install the IRF520 Mosfet at Q25. just a thought.. probably not anything to worry about. 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. by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive I agree with all the info above. I like the variable power mod. Remember, I didn't come up with this mod, I just documented it here. 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. Hey Sonoma .. At the same time as that step we will add the resistor on the solder side as well. Oh and also replace c71 with a 33uf 16v. IRF520 and ERF2030 are the same. Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. Thanks for the info. by Dino November 10th, 2008, 8:48 pm, Post You're radio should dead key close to ten watts and swing close to 30. by CBSlicer August 4th, 2014, 1:33 pm, Post How well is the cab grounded to the rest of the vehicle? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Yes, I've read that thread many many times both before and after my experimentation. Make sure to use the same terminals that the original RF gain wires used. i know this is a old thread but i done the same mod and now nothing . 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. The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. Wow Andy, have you ever thought about writing a book? MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). JavaScript is disabled. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. amzn_assoc_ad_type = "link_enhancement_widget"; anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Here is a link to instructions for replacing the final . 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. by halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. It may not display this or other websites correctly. Is so, any idea how much? I don't have it here at work with me and CBTricks is still down. A little solder on the pins , otherwise like new. 2 and 3/4 DX RADIO CHAOS. The 520 didn't produce the power the 13n10 did but it was a cleaner power. Remove C53 and solder it across C59. 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 . You found us! JavaScript is disabled. Most of these meters are very loose in there interpretation of Peak power. Look toward the rear of the radio and locate JP36. WARNING: Modifying your CB radio is illegal. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. 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.
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