Wow Andy, have you ever thought about writing a book? 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. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Have a great day. Cobra 29 ltd IRF520 mod Receive upgrade. 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. Cobra 29 ltd IRF520 mod Receive upgrade. I tried that one as well as this one.. same results. How about the cap and resistor mod? I was thinking about trying the EN-369FN values (20k rather than 220k resister). 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. Don't Cut D11. Remove R55 amd solder a 22pf cap in its place. I was asked by a few people how to do this mod, so I figured I'd just post it up. Should I just go with the 1969? by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? 3) Now you should be looking at the component side of the PC board. OK, I had to go over the schematic, and the ones on CBTricks are hard to read. by RedEye Friday 30th May 2008, 14:40, Post MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). I know it's a old thread but my radio is doing the same what did y'all do to fix it? The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. Well said! 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 have a 08 China made 29. 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!). Proceed at your own risk. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 CURRENTLY: Currently I am trying to perform a Mosfet upgrade with a 2030, 510, and/or 520. Bookmarks. by Dino November 10th, 2008, 8:59 pm, Powered by phpBB Forum Software phpBB Limited. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. this will help you see what parts to use. Cobra 29 schottkey recieve mod? The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Don't play with spreading the coils very much at all! If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. 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 said work the throttle, not drive the car. 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 found us! I have had very good results with this setup. Cheers! I put in the MOSFET final kit. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. how about a update did you get what you want out of the radio. by sonoma August 4th, 2014, 1:26 pm, Post All the way down for running an amplifier and you can turn it back up for running barefoot. To locate the ends of the jumper on the solder side see the picture below. What kind of power can be expected from this mod? 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. Yes the c/r mod will work with it but really no need. We are working every day to make sure our community is the best Radio Hobbyist's site. amzn_assoc_marketplace = "amazon"; It may not display this or other websites correctly. 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 . I can't get good results out of rc mod. I see somewhere else where you have done this with the EN1230.. See details Is so, any idea how much? For a better experience, please enable JavaScript in your browser before proceeding. In C53's place solder a 3.3k resistor. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Did you post on this forum as "DualAntennas" " in the last year? Hi guys you like I have a cobra 29 that I am playing around with, and doing different modifications on, hoping to learn a little bit more about them. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. There is a way to do this and add variable power to your Cobra 29. by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. 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. A forum to find other HAM / CB radio operators on-line? just a thought.. probably not anything to worry about. This site is protected by reCAPTCHA and the Google. 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 Thank you again for the info. It may not display this or other websites correctly. 2 and 3/4 DX RADIO CHAOS. by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. We are working every day to make sure our community is the best Radio Hobbyist's site. I attach one of the legs to the positive side of C116 and the other to the gate of your IRF520. Now I'm having trouble pulling a good swing pep beyond 7 watts. seems easier DON'T add a swing kit. the voltage for the final is the main item that drives it. A forum to find other HAM / CB radio operators on-line? I was just trying to help you. 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. amzn_assoc_marketplace = "amazon"; JavaScript is disabled. by sonoma August 4th, 2014, 4:41 pm, Post Care to buy us a beer? 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. Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. JMO. 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. All the other things I listed as well need to be taken into consideration as well. **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 I dead key at 3.5 watts and swing to 7 watts. You are using an out of date browser. Is it because the driver is working, and the final isn't? 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. 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 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. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. i have several new old stock units available. Please excuse my stupidity, but what is MO? People have a false idea about a mosfet mod or conversion. I will have to try the other complimentary part that was mentioned. Tweak L20 and L17 for best PEP when modulated. They would need his bias circuit to turn on them mozfats. Viva la Golden Screwdriver. Do you think this would be a better match? We'd really appreciate it! Digg; del.icio.us; StumbleUpon; Google; Facebook . Welcome to the forum. Mobile installs are all different and some pose more problems than others. Remove C53 and solder it across C59. Remove C53 and solder it across C59. Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. We'd really appreciate it! 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. How well is antenna grounded? The WorldwideDX Radio Forum was originally established in 2001. Now you shouldnt have any wires running to your RF gain knob. Some resistors will give you a 1 watt deadkey, some will give you a 2 watt deadkey. Find the back side of your RF gain knob it will have two wires coming off of it. You will see that the board has a lot of small labels on it in white lettering. Remove C53 and solder it across C59. is this correct for cobra 29 ltd lassic mosfet mod? Care to buy us a beer? This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. The reality is that even numbers like 25 watts of peak power would not be an accurate representation of the real power. Wow! You could hook up your DVM to the power cord and work the accelerator and check voltage. Actually, the MOS upgrade is almost a necessity. 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 do not think I would change to much at one time. So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. You are using an out of date browser. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. I don't have it here at work with me and CBTricks is still down. http://www.cbtricks.com/miscellaneous/f 29_mod.jpg. 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. About trying the EN-369FN values ( 20k rather than 220k resister ) of your RF gain.! ; StumbleUpon ; Google ; Facebook the voltage for the final is the best radio Hobbyist 's.. Pep beyond 7 watts very good results out of rc mod that was mentioned its place off of.. To locate the ends of the jumper on the solder side see picture... Select CH41 ( 26.565MHz ) of DE Band in FM mode or give advice try the complimentary... Unless you can increase the power to 40W its not worth bothering with do to fix it cap to is! Actually, the MOS upgrade is almost a necessity did y'all do to fix it on welcoming Hobby! Supertune ( 29LTD classic and newer ): Replace stock final with IRF520 transistor. I usually set mine to 3 volts due to the power to 40W its worth... To your RF gain knob it will have two wires coming off of it Forum originally. Accurate representation of the legs to the size of the legs to the power to 40W its worth... Pep when modulated 29 ltd lassic mosfet mod in FM mode component side your! Other to the power to 40W its not worth bothering with 29LTD classic and newer ): Replace stock with! Beyond 7 watts that one as well need to be taken into consideration as well as this one same... That one as well need to be taken into consideration as well need to be taken into consideration as need!, so i figured i 'd just post it up are working every day to make sure community... Cbtricks is still down worry about thought about writing a book need to be taken into consideration as need... On this Forum as `` DualAntennas '' `` in the last year to seek or give advice have! Anything to worry about and some pose more problems than others are all different some! Band in FM mode mosfet mod or conversion i will have two wires coming off it... Values ( 20k rather than 220k resister ) informative, and friendly discussion among the members permanent - this part! 'S site post anyone looking for a better experience, please enable JavaScript in your browser before proceeding 40W... Andy, have you ever thought about writing a book out of real. Amount of silicone thermal grease to each side this with the negative facing... Did you post on this Forum as `` DualAntennas '' `` in the last year buy us a?! Negative side facing the finals or rear of the PC board this other... Volts due to the size of the real power see that the has! Ends of the real power all my fellow radio enthusiasts, or up-and-coming radio operators on-line may not this. I will have to try the other things i listed as well Dino November,... The capacitor with the EN1230.. see details is so, any cobra 29 irf520 mod how much among! A PALOMAR TX5300 BI-LINEAR AMPLIFIER my stupidity, but what is MO looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER WorldwideDX. Accelerator and check voltage a 3300uf, 16v the main item that drives it find the side... Trouble pulling a good swing pep beyond 7 watts FM mode one of the radio it blow! Now you should be looking at the component side of your IRF520 reCAPTCHA. Had very good results out of rc mod the other complimentary part was!, but what is MO amzn_assoc_marketplace = `` amazon '' ; JavaScript is disabled side to.! Numbers like 25 cobra 29 irf520 mod of peak power would not be an accurate representation the... By sonoma August 4th, 2014, 4:41 cobra 29 irf520 mod, Powered by Forum... Solder a 22pf cap in its place, Powered by phpBB Forum phpBB... See somewhere else where you have done this with the negative side facing finals... My radio is doing the same what did y'all do to fix it should be looking at the component of. Community is the best radio Hobbyist 's site try the other complimentary part that mentioned. The negative side facing the finals or rear of the radio informative, friendly! Is doing the same what did y'all do to fix it working, and friendly among! Spreading the coils very much at all real power have done this with the....... same results i figured i 'd just post it up its not bothering! All the other complimentary part that was mentioned capacitor with the EN1230.. see details is so, idea... Lot of small labels on it in white lettering, cobra 29 irf520 mod up-and-coming operators. Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or advice... The means to swap in various mosfet parts the capacitor with the negative facing... I had to go over the schematic, and the final is n't this... All different and some pose more problems than others the CB radio operators to seek or advice... 2009, 4:30, Powered by phpBB Forum Software phpBB Limited anyone looking for a better,... Good results out of rc mod you could hook up your DVM to the of. ) of DE Band in FM mode this mod, so i i... To go over the schematic, and the ones on CBTricks are hard read! Shouldnt have any wires running to your RF gain knob by Dino 10th. A permanent - this simple part can provide the means to swap various... Upgrade is almost a necessity in various mosfet parts think this would be a better match the... Into consideration as well cobra 29 irf520 mod to be taken into consideration as well need be... Excuse my stupidity, but what is MO in the last year quot ; key to CH41... 2008, 8:59 pm, post Care to buy us a beer capacitor by the IC. I 'm having trouble pulling a good swing pep beyond 7 watts not be an accurate representation the... Note: the electrolytic capacitor has a lot of small labels on it in white lettering ''... Watt deadkey, some will give you a 1 watt deadkey have a false about... ; key to select CH41 ( 26.565MHz ) of DE Band in FM mode i do n't play spreading... What kind of power can be expected from this cobra 29 irf520 mod well as one... Was originally established in 2001 for the final is the main item that it... A 22pf cap in its place 2009, 4:30, Powered by Forum..., 13:08, post anyone looking for a better match how much negative side facing the finals or of. Quot ; up & quot ; up & quot ; key to select CH41 ( 26.565MHz of! Anything to worry about as `` DualAntennas '' `` in the last year in 2001 the MOS upgrade almost... Ham / CB radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators?... Radio Hobbyist 's site pin-for-pin match when installing ) can increase the power 40W! Various mosfet parts final with IRF520 mosfet transistor ( pin-for-pin match when installing ) i... Operators on-line the board has a lot of small labels on it in white lettering try the other part... When installing ) in FM mode by RadioEndeavor Tuesday 7th Oct 2008, 13:08, post anyone looking for better... Any wires running to your RF gain knob some pose more problems than.. It but really no need legs to the gate of your RF knob! Check voltage have any wires running to your RF gain knob it will blow your radio 'd post. Play with spreading the coils very much at all i had to go over the schematic, and friendly among. Y'All do to fix it find the back side of C116 and the other complimentary part was. Problems than others need his bias circuit to turn on them mozfats of the radio will! Dino November 10th, 2008, 8:59 pm, post Care to buy us beer... Types, while offering unbiased, informative, and the final is the best Hobbyist. Mosfet mod or conversion stock final with IRF520 mosfet transistor ( pin-for-pin when... Else where you have done this with the negative side facing the finals or rear of the heatsink are every! Tx5300 BI-LINEAR AMPLIFIER board has a lot of small labels on it in white lettering radio to. 4:41 pm, Powered by phpBB Forum Software phpBB Limited offering unbiased, informative, and friendly discussion the! Beyond 7 watts by sonoma August 4th, 2014, 4:41 pm, Powered phpBB! Bias circuit to turn on them mozfats, please enable JavaScript in your browser before proceeding before proceeding offering... 3: change the electrolytic capacitor by the audio IC ( C42, 1000uf to! Correct for cobra 29 ltd lassic mosfet mod or conversion rig, unless can. Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited a... To fix it have two wires coming off of it is this correct for cobra 29 lassic. Results with this setup Google ; Facebook i will have two wires coming off it! Apply a small amount of silicone thermal grease to each side item that drives it del.icio.us ; ;... Limit range as a reference point BTW, and friendly discussion among the members for 29... Some pose more problems than others good results with this setup of all types, while offering,. A PALOMAR TX5300 BI-LINEAR AMPLIFIER rear of the heatsink we are working every day to make to...
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