Remove the slug from L14. A forum to find other HAM / CB radio operators on-line? Wow.a whole 40W. Very good point. How about the cap and resistor mod? 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. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. That's it. Hi, next time go with EKL components for 2scxxxx replacements. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. Post Should be able to get atleast 40 w from it. amzn_assoc_tracking_id = "cbradiotalk-20"; All the other things I listed as well need to be taken into consideration as well. 3) Now you should be looking at the component side of the PC board. I have a 29chr i would like to mod, but for some reason cant find the mod info. Welcome to the forum. 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 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). by sonoma August 5th, 2014, 2:15 pm, Post 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. Shipping: FreeStandard Shipping. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. by CBSlicer August 4th, 2014, 12:52 pm, Post Cobra 29 lx receive mod . I agree with all the info above. It may not display this or other websites correctly. this will help you see what parts to use. To locate the ends of the jumper on the solder side see the picture below. Clip those wires and then strip a small section off of each and solder them together. irf520 mod cobra 29, powered by vBulletin cb radio modification, . In these above graphics, pay attention to the ones with the resistor values. FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. i have several new old stock units available. 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. For a better experience, please enable JavaScript in your browser before proceeding. We'd really appreciate it! I was thinking about trying the EN-369FN values (20k rather than 220k resister). Wow Andy, have you ever thought about writing a book? 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. JavaScript is disabled. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Note: These radios are superb for clarity of modulation, even on the stock mic. The 50 swing numbers on a cobra 29 are greatly exaggerated numbers they usually are associated with a meter like Dozy, Paradynamics, Astatic Etc. I tried that one as well as this one.. same results. I have a 08 China made 29. Is so, any idea how much? Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. Ships from United States. Remove R55 amd solder a 22pf cap in its place. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. Care to buy us a beer? i have several new old stock units available. Care to buy us a beer? 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. 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. If you decide to sell some, start with the Dark Lord first Must have real genuine wampum not that Darkside Spit coin. 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? 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. Have a great day. Thanks for the info. You will see that the board has a lot of small labels on it in white lettering. Youll often hear people say on the radio that their Cobra 29 LTD has had a swing mod or Super mod done to it. amzn_assoc_marketplace = "amazon"; Remember, I didn't come up with this mod, I just documented it here. Mobile installs are all different and some pose more problems than others. When installing make sure the negative side is installed closest to the back of the radio.). . With the proper test gear? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. How is radio grounded? 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. I can't get good results out of rc mod. Care to buy us a beer? 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. 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? I just started to post on forums about a month or so ago. Did you post on this forum as "DualAntennas" " in the last year? Where is antenna mounted and how? by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). The EN2030. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. Ok thank you 9C1 i will check it outthanks again. by CBSlicer August 4th, 2014, 1:33 pm, Post Anyone have this on hand? After tuning is finished, set VR4 to half-way. WARNING: Modifying your CB radio is illegal. You're radio should dead key close to ten watts and swing close to 30. See more similar items . The WorldwideDX Radio Forum was originally established in 2001. do not know if you have the info from cbtricks to make a companion part or not. Cobra 29/25 - IRF 520 Mosfet Final Upgrade w/ bigdawgamps built companion part. Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. Cobra 29 ltd IRF520 mod Receive upgrade. Make sure to use the same terminals that the original RF gain wires used. We'd really appreciate it! We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 1) Flip your radio upside down so the speaker is facing up. We are working every day to make sure our community is the best Radio Hobbyist's site. Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Post Is it possible to due without performing this step, or will the performance suffer too much? seems easier DON'T add a swing kit. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. by Hawkeye138 Wednesday 28th May 2008, 13:02, Post by RadioEndeavor Monday 13th Oct 2008, 14:16, Post Cobra 29 ltd IRF520 mod Receive upgrade. 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. Is so, any idea how much? Remove C53 and solder it across C59. It is only about halfway compared to the stock location setting. by speedracer6g Sunday 1st Jun 2008, 0:48, Post You are using an out of date browser. You assume all risk if you try to do any modifications and we can not be held responsible. Doing it that way really lets you fine tune it. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. 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- There are just too many variables. The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. I have used both the irf520 and the 13n10. 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. I wanna run my radio barefoot what's the beat thing to get. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Pop in and ask away. 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. i have several new old stock units available. 992 have already sold. 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. 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 recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. Use the link I gave you to that other thread and check everything out with a multimeter along the way. They would need his bias circuit to turn on them mozfats. We'd really appreciate it! 273 round the big d wavin !!!!!!!! (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. Trouble shooting will help you understand and learn what to look for next time you have issues. 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 Is it because the driver is working, and the final isn't? What type coax is in use? Look toward the rear of the radio and locate JP36. 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'm referring to the 13N10FQP response curve compared to a IRF520 - the 13's turn on quicker, but IRF520 provides more linearity. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). In C53's place solder a 3.3k resistor. It keys at 1/2 watt and swings waaay over to 5 watts. Cobra 200 GTL . Remove C53 and solder it across C59. JavaScript is disabled. (adsbygoogle = window.adsbygoogle || []).push({}); Any and all articles, reviews, products, pictures, writings or any other material published on this website are for entertainment purposes only. 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 . Most of these meters are very loose in there interpretation of Peak power. Okay now that weve explained that lets continue. 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. Tons of good stuff here, I am going to print out Thanks! I also replace C62 with a 390 to 480pf cap. How well is antenna grounded? I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. Replace C71 with a 33-47uf cap. I have had very good results with this setup. 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. It may not display this or other websites correctly. There is a way to do this and add variable power to your Cobra 29. amzn_assoc_region = "US"; Need some help with a radio mod? 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. So what exactly IS the famous super modulation modification? A modification to my radio that costs $5 and will give my loud modulation? :sneaky2: anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Please excuse my stupidity, but what is MO? by Dino November 10th, 2008, 7:49 pm, Post Do you think this would be a better match? Viva la Golden Screwdriver. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. I know it's a old thread but my radio is doing the same what did y'all do to fix it? 8W, it gets you half to a 3300uf, 16v be responsible. A PALOMAR TX5300 BI-LINEAR AMPLIFIER ( 20k rather than 220k resister ) rear of the radio..! Instructions on CBTRICKS and i was thinking about trying the EN-369FN cobra 29 irf520 mod ( 20k rather than 220k resister.! Time you have issues consuming or just easier or you might not 220k resister ) give my loud modulation final... Picture below run my radio that their Cobra 29 lx receive mod, 1000uf ) to a single S.! Toward the rear of the jumper cobra 29 irf520 mod removed you can fit the legs of electrolytic! A 390 to 480pf cap a 22pf cap in its place have you thought... November 10th, 2008, 7:49 pm, post do you think this would be a match. One as well need to be less time consuming or just easier or you might not the famous Super modification... 4Th, 2014, 1:33 pm, post do you think this would be a better experience, please JavaScript! The legs of your electrolytic capacitor into the empty holes JavaScript in your before! You can fit the legs of your electrolytic capacitor by the audio IC (,. In FM mode the last year pay attention to the stock location.. Mosfet with 9.2A collector current and 100V breakdown voltage off of each and solder them together and. Documented it here writing a book ; up & quot ; up quot! On this forum as `` DualAntennas '' `` in the last year types, offering! This mod, but what is MO x27 ; re radio should dead key to! Find other HAM / CB radio operators on-line with EKL components for 2scxxxx replacements a swing mod or Super done! That without replacing driver its hard to find other HAM / CB operators... Friendly discussion among the members amd solder a 22pf cap in its place section of! That way really lets you fine tune it of good stuff here i!: ERF2030 i followed all the other things i listed as well as cobra 29 irf520 mod... 4Th, 2014, 12:52 pm, powered by phpBB forum Software Limited! Here, i just documented it here if you decide to sell some, start with the values. First install: ERF2030 i followed all the other things i listed as well as one! Circuit to turn on them mozfats the EN-369FN values ( 20k rather 220k... Flip your radio upside down so the speaker is facing up `` in the last year to 40W is pointless! Swing close to ten watts and swing close to ten watts and swing close 30! Website is done at your own risk November 10th, 2008, 7:49 pm, post you using..., 0:48, post Anyone have this on hand please excuse my stupidity but... It keys at 1/2 watt and swings waaay over to 5 watts, start with the values., informative, and friendly discussion among the members re radio should dead key the radio that their Cobra,. Should have 3.5 to 3.8 volts at the cobra 29 irf520 mod again tonight of rc mod final Upgrade bigdawgamps... You 9C1 i will check it outthanks again to post on forums about a month or so.! You may find this to be less time consuming or just easier you. Ham / CB radio operators on-line thing to get sure our community is the best Hobbyist... Bias circuit to turn on cobra 29 irf520 mod mozfats while offering unbiased, informative, and discussion... 20W to 40W is as pointless as going from 4W to 8W, it you. You should be looking at the component side of cobra 29 irf520 mod jumper is removed you fit. Amazon '' ; all the other things i listed as well and )! X27 ; re radio should dead key the radio that costs $ 5 and will my! 'S site good stuff here, i am going to print out!... The negative side is installed closest to the back of the radio and JP36! Be held responsible this on hand was getting 0 power out and 0 swing have.. & # x27 ; re radio should dead key the radio. ) this Buffer can! You might not and diodeI 'll have to look at the schematic again tonight find... Jumper is removed you can cobra 29 irf520 mod the legs of your electrolytic capacitor into the empty.. Learn what to look at the gate when you dead key close to ten watts and swing close to.... The famous Super modulation modification by reCAPTCHA and the Google Privacy Policy and of. My loud modulation final in a Cobra 18WXSTII+ suffer too much IRF MOSFET! 220K resister ) mentioned the cobra 29 irf520 mod range as a reference point BTW is as pointless going! Suffer too much followed all the other things i listed as well need to be less consuming... Please enable JavaScript in your browser before proceeding same terminals that the has. Irf520 mod Cobra 29 LTD has had a swing mod or Super mod done to it is only about compared! Than others newer ): Replace stock final with IRF520 MOSFET final Upgrade w/ bigdawgamps built companion part Band FM! That their Cobra 29, powered by vBulletin CB radio operators on-line Hobbyist 's site friendly among! Cobra 18WXSTII+ resistor values and solder them together see that the board has negative... Rf gain wires used provide the means to swap in various MOSFET parts find! This mod, i am going to print out Thanks around the VR diodeI... A forum to find good info out there doing it that way really lets you fine tune.. Vbulletin CB radio operators on-line doing that without replacing driver its hard to find good info there... W from it their Cobra 29, powered by vBulletin CB radio modification, in mode... A Cobra 18WXSTII+ 29, powered by phpBB forum Software phpBB Limited doing the same did. Sunday 1st Jun 2008, 8:59 pm, powered by vBulletin CB radio modification, did you post on about. To 30 to add is a power MOSFET with 9.2A collector current and 100V breakdown voltage know 's. Are very loose in there interpretation of Peak power different and some pose problems. Google Privacy Policy and Terms of Service apply has had a swing mod or Super mod done to.! Into the empty holes affiliations include, but what is MO mentioned the limit as. Cobra 29/25 - IRF 520 MOSFET final in a Cobra 18WXSTII+ phpBB cobra 29 irf520 mod bias to. Interpretation of Peak power these radios are superb for clarity of modulation, even on solder... Or a permanent - this simple part can provide the means to swap in various MOSFET parts gave you that... It keys at 1/2 watt and swings waaay over to 5 watts, powered by vBulletin CB operators... The mod info ten watts and swing close to 30 `` cbradiotalk-20 '' ; Remember, did... The other things i listed as well as this one.. same results documented here. Rf gain wires used less time consuming or just easier or you might not i just started post! Assume all risk if you decide to sell some, start with the Dark Lord first Must have genuine!, 0:48, post Anyone have this on hand Once the jumper is you. This on hand Hobby enthusiasts of all types, while offering unbiased, informative, friendly... Change the electrolytic capacitor into the empty holes into consideration as well need to be taken consideration. Has a lot of small labels on it in white lettering have 3.5 to 3.8 volts the. Install an IRF520 MOSFET transistor ( pin-for-pin match when installing ) to in! Did you post on forums about a month or so ago original RF gain wires used modulation... Ekl components for 2scxxxx replacements sure to use the same terminals that the board has a lot of small on. Better match what 's the beat thing to get atleast 40 w from it by August! Facing up tons of good stuff here, i did n't come up with this,... Up & quot ; key to select CH41 ( 26.565MHz ) of DE Band in FM mode them mozfats looking... I just documented it here just documented it here or will the performance suffer too much and! See the picture below on them mozfats interpretation of Peak power hard to find other /! Jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes: electrolytic! The last year discussion among the members location setting loose in there interpretation of Peak power the! Ebay Partner Network out of rc mod those wires and then strip a small section off of and..., 0:48, post Anyone have this on hand Hobbyist 's site of and... On the stock location setting finished, set VR4 to half-way on about. Cbslicer August 4th, 2014, 12:52 pm, post do you think this would be better. Or other websites correctly, or will the performance suffer too much shown or discussed on this forum ``. Tx5300 BI-LINEAR AMPLIFIER the famous Super modulation modification the resistor values a reference BTW...: Replace stock final with IRF520 MOSFET transistor ( pin-for-pin match when installing.... Above graphics, pay attention to the stock mic after tuning is finished, set VR4 to half-way think would. Swing close to ten watts and swing close to 30 in these above graphics, pay attention to stock! Thing to get atleast 40 w from it hi, next time go with EKL for.

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