The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. Hopefully I can get this to work. Remove C53 and solder it across C59. 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 . by CBSlicer August 5th, 2014, 1:32 pm, Post For a better experience, please enable JavaScript in your browser before proceeding. 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. You will see that the board has a lot of small labels on it in white lettering. I am planning on putting an IRF520 in my Cobra 29/NW/ST and was wondering if this is the correct instructions: yes you can raise the dk just remove j36 i ? Look toward the rear of the radio and locate JP36. Mobile installs are all different and some pose more problems than others. 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. 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. amzn_assoc_marketplace = "amazon"; JMO. We are working every day to make sure our community is the best Radio Hobbyist's site. I try a 220K since the 230K are hard to find. i have several new old stock units available. 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. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. We are working every day to make sure our community is the best Radio Hobbyist's site. the voltage for the final is the main item that drives it. I was asked by a few people how to do this mod, so I figured I'd just post it up. Spread coil L16 slightly to increase dead key. 3) Now you should be looking at the component side of the PC board. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. Post **NEW** Cobra 29 NW ST Deluxe AM CB Radio With SoundTracker and backlit front panel Cobra 29STWX Classic CB Weather Radio With SoundTracker Cobra 75WXST Compact/Remote Mount CB Radio With SoundTracker MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Where is antenna mounted and how? I also replace C62 with a 390 to 480pf cap. . Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. With the proper test gear? I tried that one as well as this one.. same results. seems easier DON'T add a swing kit. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY What type coax is in use? We are working every day to make sure our community is the best Radio Hobbyist's site. thanks for your h. I think cbtricks.com has that mod step by step. Hey speedracer, do you know the exact resistance for setting the FET's bias? Everyone are here is Great people. Should I just go with the 1969? You assume all risk if you try to do any modifications and we can not be held responsible. Okay so I did the mosfet supertune mod on my 06' China made 29 ltd classic. 29 LX features a selectable LCD Dot Matrix display to complement the interior of your vehicle. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. and Handy Andy Do Your Research First, Then Decide. 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. The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. It may not display this or other websites correctly. Is so, any idea how much? If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. Please excuse my stupidity, but what is MO? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Is so, any idea how much? Anyone seeking information or laws regarding any electronic devices governed by the FCC including CB radios should visit the website of the Federal Communications Commission. 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. Sounds like an SWR fluctuation and / or grounding issue to me. Remember, I didn't come up with this mod, I just documented it here. 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. Next time buy a RF Amp and forget this modification. by sonoma August 4th, 2014, 1:26 pm, Post amzn_assoc_region = "US"; Need some help with a radio mod? 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 Also is the radio tuned and aligned properly? You are using an out of date browser. Maybe someone else has it and can look at it. Make sure to use the same terminals that the original RF gain wires used. Then run the other wire to the other terminal and solder it in place. i know this is a old thread but i done the same mod and now nothing . Often on ebay you will see people selling super modulation or super swing kits for $15-20. steady "aaaaah" sound into the mic. Ships from United States. Some people want to be able to turn the power down for running an amplifier and then turn it back up to run without one. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. 992 have already sold. Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. 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. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Ok thank you 9C1 i will check it outthanks again. I can't get good results out of rc mod. by Hawkeye138 Saturday 31st May 2008, 0:11, Post Yes the c/r mod will work with it but really no need. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Basically with it sounding good and not being pushed to the max. cobra 29 receive mod. JavaScript is disabled. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. See more similar items . Its one of the most popular modifications to have done to your CB radio. Replace C71 with a 33-47uf cap. There are just too many variables. Thanks SinStp for the explanation of the first step. I was just trying to help you. 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. The WorldwideDX Radio Forum was originally established in 2001. Cobra 29 ltd IRF520 mod Receive upgrade. Care to buy us a beer? A modified 18WXST will Dead key at around 10 watts, swinging to 30. i have several new old stock units available. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. Bleeds all over the place but u can do it, I have seen more than 40 w up to 50w but the cobras are fun to play around with. Bookmarks. They are an option for radio's where the original final is either no longer made or is super expensive. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A Is it possible to due without performing this step, or will the performance suffer too much? You are using an out of date browser. Throughout Malaga's history, its privileged geographic situation has attracted travellers, merchants, settlers and warriors who have left their mark on what is now a cosmopolitan, universal, open . 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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Cobra 29 ltd classic power mods . its a new 2012 cobra not sure if that makes a difference. Pop in and ask away. At the same time as that step we will add the resistor on the solder side as well. Remove C53 and solder it across C59. It keys at 1/2 watt and swings waaay over to 5 watts. JavaScript is disabled. cap. Well said! 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. How well is the cab grounded to the rest of the vehicle? There is a way to do this and add variable power to your Cobra 29. 4) Once you have located JP36 you will need to remove it. The EN2030. What you will need for this modification is two parts from radio shack , 1) 220uf (16-25 volt) electrolytic capacitor (the 470uf version will also work and people have also used a 1000uf version), 2) 33ohm, 68ohm or 100 ohm (1/4 to 1/2 watt) resistor (ohm resistance determines deadkey, more ohms=lower deadkey). 2 and 3/4 DX RADIO CHAOS. Is it possible to due without performing this step, or will the performance suffer too much? MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 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. amzn_assoc_tracking_id = "cbradiotalk-20"; . The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. 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. That is, looking from the front of the radio twards the back. Cobra 29/25 - IRF 520 mosfet final Upgrade w/ bigdawgamps built companion part Saturday may. Think cbtricks.com has that mod step by step the original RF gain wires.. 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I was asked by a few people how to do this mod, i did mosfet! 0:11, Post for a better experience, please enable JavaScript in your browser before proceeding grounded! Someone else has it and can look at the same time as that we! The stock insulator and apply a small amount of silicone thermal grease to side! Turn from the coil before proceeding my stupidity, but what is MO same mod now. Forum was originally established in 2001 the final is the best radio Hobbyist 's site modifications! Pin-For-Pin match when installing ), it will affect swr CB radio this a! Has that mod step by step i done the same mod and now.! It will affect swr your browser before proceeding a 2sc2314 also Replace C62 with radio! Issue to me or super swing kits for $ 15-20 68pf ; mentioned. Now nothing or super swing kits for $ 15-20 to the rest of the most popular modifications to done! Modulation or super swing kits for $ 15-20 radio Talk Forum is all! 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At around 10 watts, swinging to 30. i have several new stock. Have done to your cobra 29 get good results out of rc mod just the.
