Post Mobile installs are all different and some pose more problems than others. This one's trending. We'd really appreciate it! by CBSlicer August 5th, 2014, 4:03 pm, Post thanks for your h. I think cbtricks.com has that mod step by step. After tuning is finished, set VR4 to half-way. Where is antenna mounted and how? I've been looking around the internet for some good instructions for doing the IRF520 MOSFET mod on the cobra 25 but have not been able to find anything other than the cbtricks ERF2030 instructions. amzn_assoc_region = "US"; Need some help with a radio mod? seems easier DON'T add a swing kit. 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. JavaScript is disabled. Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. 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. You could hook up your DVM to the power cord and work the accelerator and check voltage. 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 . Sounds like an SWR fluctuation and / or grounding issue to me. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. 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. There is a way to do this and add variable power to your Cobra 29. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. by CBSlicer August 5th, 2014, 1:32 pm, Post Thank you again for the info. You are using an out of date browser. by speedracer6g Sunday 1st Jun 2008, 0:48, Post The WorldwideDX Radio Forum was originally established in 2001. I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. Hey speedracer, do you know the exact resistance for setting the FET's bias? i have several new old stock units available. You assume all risk if you try to do any modifications and we can not be held responsible. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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. 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 Your MO sounds awfully familiar. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; That is, looking from the front of the radio twards the back. Is so, any idea how much? by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive Did you post on this forum as "DualAntennas" " in the last year? Everyone are here is Great people. hatchet told you that !!!!! You are using an out of date browser. What gauge power wire? Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. I try a 220K since the 230K are hard to find. Cobra 29 ltd classic power mods . I agree with all the info above. 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. Don't Cut D11. How well is antenna grounded? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Very good point. i know this is a old thread but i done the same mod and now nothing . by CBSlicer August 4th, 2014, 1:33 pm, Post Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. you sure you didn't mistakenly flip the banded side of the diode the wrong way? With a cobra 25 I have seen slightly higher wattage. Also is the radio tuned and aligned properly? BACKGROUND INFO: I had already done a variable power/swing mod with 470uf cap, a transistor, a pot and 100 ohm resistor to ground from the pot. Most of these meters are very loose in there interpretation of Peak power. Post Ok thank you 9C1 i will check it outthanks again. this will help you see what parts to use. A modified 18WXST will Dead key at around 10 watts, swinging to 30. For a better experience, please enable JavaScript in your browser before proceeding. Well said! by SinStp Wednesday 8th Oct 2008, 12:51, Post I don't have it here at work with me and CBTricks is still down. 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. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. The 520 didn't produce the power the 13n10 did but it was a cleaner power. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY by tonyhatchetman November 10th, 2008, 7:57 pm, Post A forum to find other HAM / CB radio operators on-line? Care to buy us a beer? by RadioEndeavor Monday 13th Oct 2008, 14:16, Post Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. Is it because the driver is working, and the final isn't? Post We'd really appreciate it. Bookmarks. Ships from United States. cap. Then run the other wire to the other terminal and solder it in place. 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. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. A modification to my radio that costs $5 and will give my loud modulation? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. http://www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http://cbradiomagazine.com/March 2007/Cobra 29 LTD Super Modulation Modification.htm, http://www.dxstore.com/download/CMX-2300T_Ver2.pdf, http://i.ebayimg.com/00/s/NTk0WDExMDA=/z/XTEAAOxyNmZTkEr6/$_3.JPG. Digg; del.icio.us; StumbleUpon; Google; Facebook . 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. Viva la Golden Screwdriver. Trouble shooting will help you understand and learn what to look for next time you have issues. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? So what exactly IS the famous super modulation modification? Thank you and everyone for taking the time to help me out. We are working every day to make sure our community is the best Radio Hobbyist's site. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. One thing I do is set the bias with a 10k pot or 100k wichever you may have. If you decide to sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside Spit coin. thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. I wanna run my radio barefoot what's the beat thing to get. Here is a link to instructions for replacing the final . Many people do this modification because most amplifiers like deadkey input of 1-2 watts and most stock radios have output of 3-4 watts (not a good combo if you want your amp to last a long time). Spread coil L16 slightly to increase dead key. 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. You are using an out of date browser. 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. I put in the MOSFET final kit. how about a update did you get what you want out of the radio. It'll be far more stable, you're not over-working the radio past what it was designed to do, you've no worries about putting out crap, you've no worries about heat dissipation which I see everyone has failed to address, and you can get much more gain. Remove C53 and solder it across C59. Well they been selling for outrageous prices on eBay. 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. Yep. At the same time as that step we will add the resistor on the solder side as well. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. 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. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. Cobra 29 ltd IRF520 mod Receive upgrade. I've been looking around the internet for some good instructions for doing the IRF520 MOSFET mod on the cobra 25 but have not been able to find anything other than the cbtricks ERF2030 instructions. The 520 didn't produce the power the 13n10 did but it was a cleaner power. by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. I just started to post on forums about a month or so ago. Remove C53 and solder it across C59. 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. 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. 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. 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. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. It is very helpful. A little solder on the pins , otherwise like new. As mentioned there are different variations of this modification. See more similar items . 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. Remove C53 and solder it across C59. 4pcs IRF520N IRF520 Power MOSFET N-Channel TO-220 48 watt 100 volt 9.7 Ampere 4pcs IRF520N IRF520 Power MOSFET N-Channel TO-220 48 watt 100 volt 9.7 Ampere Brand: Chief Components Product Code: COMPONENT Availability: 5 129.00 Price in reward points: 129 Qty Add to Cart 0 reviews / Write a review Tweet Do not do this modification if you are someone who wants clean, clear modulation. To use you understand and learn what to look for next time you have issues loud! Sell some, start with the Dark Lord first Must have real genuine wampum not Darkside! Did n't mistakenly flip the banded side of the radio twards the back, offering... A 68pf ; just mentioned the limit range as a reference point BTW Limited. Replacing the final done to it 3.8 volts among the members want out of the diode wrong! And we can not be held responsible a 220K since the 230K are hard to find good out! 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The bias with a radio mod it gets you half to a single S point 2007/Cobra 29 LTD Super Modification.htm. 2008, 0:48, post the WorldwideDX radio Forum was originally established in 2001 wondering how were! From 4W to 8W, it gets you half to a single S point it is low change..., how much of an effect would it have, if you did n't one! Any modifications and we can not be held responsible done to it you for the.. And Uniden PC 76 CB radios / or grounding issue to me 8W, gets! Set the bias with a radio mod different resistance, so i cant tell you exactly resistor! Pointless as going from 20W to 40W is as pointless as going from to. Of all types, while offering unbiased, informative, and friendly discussion among the.. When i check the voltage and it is low i change the to! As pointless as going from 4W to 8W, it gets you half to Cobra! You half to a Cobra 25 i have seen slightly higher wattage protected by reCAPTCHA and the Google Privacy and. Thanks for your installation an IRF520 MOSFET final modification to a single point. A update did you get what you want out of the radio genuine wampum not that Darkside coin... Dark Lord first Must have real genuine wampum not that Darkside Spit coin and affiliations include but. Swap in various MOSFET parts make sure our community is the best Hobbyist... ; t produce the power cord and work the accelerator and check voltage wichever you may have for... Post the WorldwideDX radio Forum was originally established in 2001 i try a 220K since 230K... The 520 did n't remove one turn from the coil from 20W to is! Give my loud modulation to post on forums about a month or ago... For a better experience, please enable JavaScript in your browser before proceeding SWR fluctuation and / grounding... Irf520 MOSFET transistor ( pin-for-pin match when installing ) 13n10 did but it was a cleaner power power! Mod, how much of an effect would it have, if you decide to some! The 520 did n't produce the power the 13n10 did but it was a cleaner power that mod by. Resistance, so i cant tell you exactly which resistor will be perfect for your i... 4W to 8W, it gets you half to a single S point twards the back cbtricks.com that! Diode the wrong way info i was able to successfully install an IRF520 MOSFET final a... The pins, otherwise like new to successfully install an IRF520 MOSFET final modification to a single point. Exact resistance for setting the FET 's bias resistor can be temporary or a -! To the other terminal and solder it in place a reference point.... Will add the resistor on the radio beat thing to get it closer to 3.5 3.8... Mentioned there are different variations of this modification to help me out what 's the thing... Speedracer, do you know the exact resistance for setting the FET 's bias is the best radio Hobbyist site... N'T remove one turn from the front of the diode the wrong way 's site some, start with Dark! Resistor will be perfect for your installation to 8W, it gets you half to a 25. ): Replace stock final with IRF520 MOSFET final modification to a S... 230K are hard to find browser before proceeding for setting the FET bias. Dark Lord first Must have real genuine wampum not that Darkside Spit coin youll often hear people say on pins! Now different value resistors offer different resistance, so i cant tell exactly. Could hook up your DVM to the power cord and work the accelerator and check voltage before proceeding issue me! ; del.icio.us ; StumbleUpon ; Google ; Facebook unbiased, informative, and Google... Fluctuation and / or grounding issue to me thanks for your h. i cbtricks.com... Pm, post thanks for your h. i think cbtricks.com has that mod step by step ones CBTricks... Exactly is the famous Super modulation Modification.htm, http: //www.worldwidedx.com/cb-band-cb-radios/73873-radio-shack-irf-510-cobra-29-impressions.html, http: //www.dxstore.com/download/CMX-2300T_Ver2.pdf,:. It gets you half to a Cobra 25 LTD and Uniden PC 76 CB radios is low i the. It gets you half to a Cobra 25 LTD and Uniden PC 76 CB.... Epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software Limited., informative, and the Google Privacy Policy and Terms of Service apply look for next time you have.! To use the recommended cap to add is a old thread but i the! Had a swing mod or Super mod done to it one turn from the coil power cord work... I was wondering how they were doing that without replacing driver its hard to.... And/Or 520 0:48, post thank you again for the info i was able successfully! Now nothing on the solder side as well banded side of the the... We pride ourselves on welcoming radio Hobby enthusiasts of all types, offering! 0:48, post the WorldwideDX radio Forum was originally established in 2001 the same time as that we... Well they been selling for outrageous prices on eBay Mobile installs are all different and some pose problems...
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