cobra 29 irf520 modcobra 29 irf520 mod

In C53's place solder a 3.3k resistor. Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. hatchet told you that !!!!! by sonoma August 4th, 2014, 4:41 pm, Post 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? 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 mod should be capable of swinging 8 watts, but just to be safe I set it up for a 4 watt . Post Then run the other wire to the other terminal and solder it in place. Yes the c/r mod will work with it but really no need. 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. If you dont' have the skills, knowledge and tools simply don't do that. http://www.worldwidedx.com/general--built-hot-cobra-29-local-boy-he-blew-up.html. Also is the radio tuned and aligned properly? do not know if you have the info from cbtricks to make a companion part or not. For a better experience, please enable JavaScript in your browser before proceeding. 5) Once the jumper is removed you can fit the legs of your electrolytic capacitor into the empty holes. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. . I use the compimentary part in conjunction with this mod also. amzn_assoc_region = "US"; Need some help with a radio mod? Now different value resistors offer different resistance, so I cant tell you exactly which resistor will be perfect for your installation. , 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 . We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. i have several new old stock units available. 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. Remove C53 and solder it across C59. 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. 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. irf520 cb, irf520 cobra 29, mosfet cb amps, irf520 in cb amplifiers, powered by myBB president cb radio mods, cb radio irf520 . The WorldwideDX Radio Forum was originally established in 2001. don't know if it would be the same for the cobra or not. Note: These radios are superb for clarity of modulation, even on the stock mic. 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. by Dino November 10th, 2008, 7:49 pm, Post Where exactly was the reading taken? A modification to my radio that costs $5 and will give my loud modulation? 273 round the big d wavin !!!!!!!! I was just trying to help you. Is it because the driver is working, and the final isn't? anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Everyone are here is Great people. 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. 1: change the final to a 2sc1969 2: change the driver to a 2sc2314. I was able to successfully install an IRF520 MoSFET final in a Cobra 18WXSTII+. I see somewhere else where you have done this with the EN1230.. (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. Please excuse my stupidity, but what is MO? It keys at 1/2 watt and swings waaay over to 5 watts. That's it. 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. just a thought.. probably not anything to worry about. So what exactly IS the famous super modulation modification? There are just too many variables. At the same time as that step we will add the resistor on the solder side as well. Although the kits will work, they arent necessary. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. You assume all risk if you try to do any modifications and we can not be held responsible. For a better experience, please enable JavaScript in your browser before proceeding. JavaScript is disabled. by Dino November 10th, 2008, 8:48 pm, Post Take a Bath Productions 49.1K subscribers Subscribe 95K views 7 years ago Description of how to. I tried that one as well as this one.. same results. I enjoyed your intro. Pop in and ask away. amzn_assoc_tracking_id = "cbradiotalk-20"; Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. Cobra 29 type Meter w/white light from Workman. **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 Remove C53 and solder it across C59. Regarding the resistors around the VR and diodeI'll have to look at the schematic again tonight. by Dino_24 Thursday 20th Nov 2008, 1:11, Powered by phpBB Forum Software phpBB Limited. Should I just go with the 1969? Mobile installs are all different and some pose more problems than others. 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 like the variable power mod. Trouble shooting will help you understand and learn what to look for next time you have issues. Turn Pot VR2 fully counterclockwise to achieve full modulation. It may not display this or other websites correctly. It is only about halfway compared to the stock location setting. We'd really appreciate it! With a cobra 25 I have seen slightly higher wattage. How well is the cab grounded to the rest of the vehicle? A forum to find other HAM / CB radio operators on-line? Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. Make sure to use the same terminals that the original RF gain wires used. 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. by tonyhatchetman November 10th, 2008, 7:57 pm, Post the voltage for the final is the main item that drives it. A forum to find other HAM / CB radio operators on-line? do not think I would change to much at one time. $4.50: Radio Cover Screws (Cabinet Screws) (Bag of 10) $2.50: Size: Fast-acting " x 1-1/4" glass . by sonoma August 5th, 2014, 2:15 pm, Post Remove C126. 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 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. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. If you do not install the capacitor with the negative side facing the finals or rear of the radio it will blow your radio. 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. how about a update did you get what you want out of the radio. 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. Is so, any idea how much? Its one of the most popular modifications to have done to your CB radio. How well is antenna grounded? Remember, I didn't come up with this mod, I just documented it here. 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. ALL KITS COME WITH COMPLETE INSTALLATION INSTRUCTIONS $15.00 EACH SELECT RADIO MODEL IRF-520 MOSFET FINAL TRANSISTOR REPLACEMENT FOR 858 PLL UNITS ONLY Cobra 29 schottkey recieve mod? take a look at the mosfet mod paper work from cbtricks and see if you missed a step. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. i have several new old stock units available. You're radio should dead key close to ten watts and swing close to 30. A modified 18WXST will Dead key at around 10 watts, swinging to 30. Do not do this modification if you are someone who wants clean, clear modulation. Apr 23, 2018 5,755 8,059 573 www.cbtricks.com Jan 5, 2020 So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. All the other things I listed as well need to be taken into consideration as well. Shipping: FreeStandard Shipping. http://www.worldwidedx.com/tech-repair/26775-erf-2030-a.html, CBTricks MOSFET Experimenter's Information Notes, http://www.worldwidedx.com/tech-repair/24863-mosfets.html. Replace C71 with a 33-47uf cap. work with the mosfet? All the way down for running an amplifier and you can turn it back up for running barefoot. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. is this correct for cobra 29 ltd lassic mosfet mod? (A watt meter is needed to see the results of course. by sonoma August 4th, 2014, 1:26 pm, Post Hi guys. Cobra 29 LTD super modulation modification | CB Radio Magazine It's one of the most popular modifications to have done to your CB radio. I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. 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 You could hook up your DVM to the power cord and work the accelerator and check voltage. Remove C53 and solder it across C59. I was thinking about trying the EN-369FN values (20k rather than 220k resister). Care to buy us a beer? The EN2030. Any attempt to reproduce or repeat anything shown or discussed on this website is done at your own risk. amzn_assoc_marketplace = "amazon"; 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. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. With the proper test gear? by CBSlicer August 4th, 2014, 1:33 pm, Post I just started to post on forums about a month or so ago. See more similar items . Sounds like an SWR fluctuation and / or grounding issue to me. ok..want to do 520 mosfet in a cobra 29 but not sure which instruction to use..(insturctions via internet) any suggestions? amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; 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!). Make sure to reinstall the stock insulator and apply a small amount of silicone thermal grease to each side. I don't have it here at work with me and CBTricks is still down. We are working every day to make sure our community is the best Radio Hobbyist's site. 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. Care to buy us a beer? cobra 29 receive mod. 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. Hope this helps you get what you want. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. This Buffer Resistor can be temporary or a permanent - this simple part can provide the means to swap in various MOSFET parts. and Handy Andy Do Your Research First, Then Decide. Look toward the rear of the radio and locate JP36. by CBSlicer August 4th, 2014, 12:52 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. just a thought.. probably not anything to worry about. 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 . by SinStp Wednesday 8th Oct 2008, 12:51, Post , cobra 29 receive mods, cobra 29 diodes for receive I used these to do a MOSFET final modification to a Cobra 25 LTD and Uniden PC 76 CB radios. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Hey speedracer, do you know the exact resistance for setting the FET's bias? the resister across the bottom is the one that increases your input to the gate. Then put volt meter the gate and set your voltage to 2.7 to 3.2 volts the higher the voltage the more deadkey and forward power you will get. Turn VR4 (AMC) counterclockwise fully. 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 ? Proceed at your own risk. Ships from United States. 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. Thank you again for the info. The IRF520 is a Power Mosfet with 9.2A collector current and 100V breakdown voltage. 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. Your MO sounds awfully familiar. You are using an out of date browser. It may not display this or other websites correctly. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. The WorldwideDX Radio Forum was originally established in 2001. THIS KIT IS FOR UPGRADING THE FACTORY 2SC2078 FINAL OUTPUT TRANSISTOR, OR, TO REPLACE A BURNED 2078, 1969, ERF2030, OR PREVIOUS IRF520 FINAL. 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. Okay now that weve explained that lets continue. by sonoma August 5th, 2014, 1:22 pm, Post by epaparo Friday 25th Sep 2009, 4:30, Powered by phpBB Forum Software phpBB Limited. Once done your RF gain will now control your variable power. Clip those wires and then strip a small section off of each and solder them together. Should be able to get atleast 40 w from it. We are working every day to make sure our community is the best Radio Hobbyist's site. 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? Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). i have several new old stock units available. Yoda gets real pissed if he sees any spit coin in the till. Now you shouldnt have any wires running to your RF gain knob. Have a great day. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. How is radio grounded? Cobra 29 lx receive mod . I have used both the irf520 and the 13n10. my galaxy 959 has a 520 for the driver as well as the final. This one's trending. 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. 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. I dead key at 3.5 watts and swing to 7 watts. And to answer your question: No. 3) Now you should be looking at the component side of the PC board. We'd really appreciate it! Malaga the Beautiful, as the city is known, stands at the centre of the basin of the same name, between the mountains, the River Guadalhorce and the coastal strip which leads to the Axarquia region.. In these above graphics, pay attention to the ones with the resistor values. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. JavaScript is disabled. The WorldwideDX Radio Forum was originally established in 2001. Why not just get a linear and use that? by halfwatt959 August 19th, 2014, 11:21 am, Powered by phpBB Forum Software phpBB Limited. Im not a CB technician so this information is being provided by an amateur unskilled individual. You found us! Now I'm having trouble pulling a good swing pep beyond 7 watts. by CBSlicer August 5th, 2014, 11:43 am, 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. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Nice mod, how much of an effect would it have, if you didn't remove one turn from the coil? Step one is refering to replacing the final as in the final transistor. amzn_assoc_ad_type = "link_enhancement_widget"; You can get all of the parts you need for this mod at Radio shack. Thank you and everyone for taking the time to help me out. 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). They are an option for radio's where the original final is either no longer made or is super expensive. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post I will have to try the other complimentary part that was mentioned. Often on ebay you will see people selling super modulation or super swing kits for $15-20. Cobra 200 GTL . Don't play with spreading the coils very much at all! amzn_assoc_tracking_id = "cbradiotalk-20"; In C53's place solder a 3.3k resistor. 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. I was asked by a few people how to do this mod, so I figured I'd just post it up. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Its pretty much the addition of two simple parts to your CB radio that you can pick up from radio shack for around $5. A little solder on the pins , otherwise like new. In addition I make no guarantee to the validity of any of this info. The 520 didn't produce the power the 13n10 did but it was a cleaner power. Doing it that way really lets you fine tune it. 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 CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. What gauge power wire? cap. (VERY IMPORTANT NOTE: The electrolytic capacitor has a NEGATIVE and POSITIVE SIDE to it. The WorldwideDX Radio Forum was originally established in 2001. 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? Pin Configuration Features N-Channel Power MOSFET Continuous Drain Current (ID): 9.2A Is so, any idea how much? by CBSlicer August 5th, 2014, 1:32 pm, Post MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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. 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. Bookmarks. 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 by RedEye Friday 30th May 2008, 14:40, Post IRF520 MOSFET MOD 4 THE OLDER COBRA 29 LTDL CB RADIO. Post 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. 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 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. You are using an out of date browser. 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. Model Number: IRF520 ; Item Package Length: 2.9921259812" Item Package Width: 2.0078740137" Item Package Height: 0.3149606296" Frequently bought together + . FIRST INSTALL: ERF2030 I followed all the instructions on CBTRICKS and I was getting 0 power out and 0 swing. Use channel "UP" key to select CH41 (26.565MHz) of DE Band in FM mode. Spread coil L16 slightly to increase dead key. 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 . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. When installing make sure the negative side is installed closest to the back of the radio.). One thing I do is set the bias with a 10k pot or 100k wichever you may have. . by CBSlicer August 5th, 2014, 4:03 pm, Post 4) Once you have located JP36 you will need to remove it. JavaScript is disabled. Hopefully I can get this to work. 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. **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 1) Flip your radio upside down so the speaker is facing up. The first thing to know about this modification is that you dont need a special kit to do it. this will help you see what parts to use. We are working every day to make sure our community is the best Radio Hobbyist's site. Viva la Golden Screwdriver. 6) Now you will need to solder the cap into place on the solder side of the PC board. 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. its a new 2012 cobra not sure if that makes a difference. People have a false idea about a mosfet mod or conversion. Yeah, sounds like the FET isn't doing it's job. Pop in and ask away. RFX mods done. You are using an out of date browser. Remove R55 amd solder a 22pf cap in its place. 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. Now one thing to remember many people like to have CBs that create very clean audio with no splatter or bleedover. I'm sure that it would have to be on the left side of the banding, as the diode is switching from that side of the circuit. Remove C53 and solder it across C59. This Will clean up the amc circuit and make it work better. Remove C 61 and solder it across C62. This site is protected by reCAPTCHA and the Google. Doing this modification to your radio may cause your radio to have bleedover into speakers, neighbors TVs etc. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Very good point. I know it's a old thread but my radio is doing the same what did y'all do to fix it? So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). amzn_assoc_linkid = "d1f76c3be326d1e5aa6f1f269686729c"; Thanks for the info. Find the back side of your RF gain knob it will have two wires coming off of it. The 520 didn't produce the power the 13n10 did but it was a cleaner power. As mentioned there are different variations of this modification. 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. Cobra 29 ltd IRF520 mod Receive upgrade. by speedracer6g Sunday 1st Jun 2008, 0:48, Post I have a 29chr i would like to mod, but for some reason cant find the mod info. 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. The WorldwideDX Radio Forum was originally established in 2001. This forum is for discussions on CB radio matters (RadioMods Website), software support with S&M Software, and discussion about my own music. Wow! IRF530 Features Transistor Type: N Channel Package Type: TO-220AB And Other Packages Max Voltage Applied From Drain to Source: 100 V Max Gate to Source Voltage: 20 V Max Continues Drain Current: 14 A Max Pulsed Drain Current: 56 A Max Power Dissipation: 79 W Minimum Voltage Required to Conduct: 2 V to 4 V you sure you didn't mistakenly flip the banded side of the diode the wrong way? 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. 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. That is, looking from the front of the radio twards the back.

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