cobra 29 irf520 mod

How well is the cab grounded to the rest of the vehicle? Please excuse my stupidity, but what is MO? Doing it that way really lets you fine tune it. Ships from United States. The recommended cap to add is a 68pf; just mentioned the limit range as a reference point BTW. JavaScript is disabled. 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. by sonoma August 5th, 2014, 2:15 pm, Post 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 irf520 mod cobra 29, powered by vBulletin cb radio modification, . This Will clean up the amc circuit and make it work better. How is radio grounded? We'd really appreciate it! 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. by RadioEndeavor Monday 13th Oct 2008, 14:16, Post I also replace C62 with a 390 to 480pf cap. For a better experience, please enable JavaScript in your browser before proceeding. I was thinking you should have 3.5 to 3.8 volts at the gate when you dead key the radio with no modulation. Is so, any idea how much? Care to buy us a beer? its a new 2012 cobra not sure if that makes a difference. and Handy Andy Do Your Research First, Then Decide. 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. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? Sounds like an SWR fluctuation and / or grounding issue to me. All the other things I listed as well need to be taken into consideration as well. how about a update did you get what you want out 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 Information presented is opinion and not expert advice. You are using an out of date browser. The WorldwideDX Radio Forum was originally established in 2001. The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers like Arduino for switching high current loads. 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. Remove the slug from L14. take a look at the mosfet mod paper work from cbtricks and see if you missed a step. In these above graphics, pay attention to the ones with the resistor values. Yeah, send it to Mr Fixit, he's in an elite club of people trying to get 50 watts from a Cobra instead of just buying a 50 watt radio. I have used both the irf520 and the 13n10. 992 have already sold. We are working every day to make sure our community is the best Radio Hobbyist's site. Cheers! thank you for the info i was wondering how they were doing that without replacing driver its hard to find good info out there. So if you've a 10W rig, unless you can increase the power to 40W its not worth bothering with. Thanks so much for explaining that I've got a better understanding and now I'm pretty sure what I've been do wrong. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Cobra 29 ltd classic power mods . Hopefully I can get this to work. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. 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 ? This site is protected by reCAPTCHA and the Google. 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'm not talking about the max to push the final super hard. The first thing to know about this modification is that you dont need a special kit to do it. 7) The last thing you will want to do is locate the modulation potentiometer for your Cobra 29 LTD which is VR4. IRF520 and ERF2030 are the same. Oh and also replace c71 with a 33uf 16v. The 520 didn't produce the power the 13n10 did but it was a cleaner power. 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 Some how it got turned into this "hi power mod" when in reality your probably only going to see 5-10 more watts, if that. The WorldwideDX Radio Forum was originally established in 2001. You are using an out of date browser. Cobra 29 ltd IRF520 mod Receive upgrade. 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? So the Buffer resistor is for the purpose of keeping your work simple yet effectively offering some method to interface and adjust your upgrade. 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. Your MO sounds awfully familiar. Spread coil L16 slightly to increase dead key. by sonoma August 4th, 2014, 1:26 pm, Post For a better experience, please enable JavaScript in your browser before proceeding. Next thing you will need to do is to remove the screws for the top and bottom covers on your radio. Yep. Going from 20W to 40W is as pointless as going from 4W to 8W, it gets you half to a single S point. Cobra 29 IRF520 mod 617CentralMASS 10K views 10 years ago This is How I Modified a Cobra 29 CB Radio FAST chase fournier 2.4K views 4 months ago COBRA 29 MOSFET CONVERSION: CB Radio How. Is it possible to due without performing this step, or will the performance suffer too much? We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. hatchet told you that !!!!! Very good point. How about the cap and resistor mod? I try a 220K since the 230K are hard to find. Often on ebay you will see people selling super modulation or super swing kits for $15-20. 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. I like the variable power mod. Thank you again for the info. I put in the MOSFET final kit. Viva la Golden Screwdriver. 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. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. by RedEye Friday 30th May 2008, 14:40, Post I agree with all the info above. by CBSlicer August 5th, 2014, 4:03 pm, Post JavaScript is disabled. They would need his bias circuit to turn on them mozfats. by RadioEndeavor Tuesday 7th Oct 2008, 13:08, Post OK, I had to go over the schematic, and the ones on CBTricks are hard to read. 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. 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 CBSlicer August 5th, 2014, 11:43 am, Post I dont promote it or condone it. Care to buy us a beer? It may not display this or other websites correctly. Note: These radios are superb for clarity of modulation, even on the stock mic. MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). 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. i have several new old stock units available. Post I know it's a old thread but my radio is doing the same what did y'all do to fix it? I was wondering because I was thinking of using a fixed resistor in place of the pot. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. Sounds like an SWR fluctuation and / or grounding issue to me. Pop in and ask away. by speedracer6g Sunday 1st Jun 2008, 0:48, Post Yoda gets real pissed if he sees any spit coin in the till. I use the compimentary part in conjunction with this mod also. Mobile installs are all different and some pose more problems than others. I just started to post on forums about a month or so ago. I have used both the irf520 and the 13n10. It'll get you a S point on the receiving end. Wow! Turn VR4 (AMC) counterclockwise fully. Cobra 29 Mosfet Modification, Complete installation, Shows ALL, Save MONEY Do it Yourself! Remove C53 and solder it across C59. The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. 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. You found us! 3: change the electrolytic capacitor by the audio IC (C42, 1000uf) to a 3300uf, 16v. by CBSlicer August 5th, 2014, 1:32 pm, Post 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 . Cobra 29 type Meter w/white light from Workman. amzn_assoc_tracking_id = "cbradiotalk-20"; And I agree about clean sounding radio I installed a super talk kit in a 29 yea it was loud on 4 channels it came out as quick as it went in lol thanks again. 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. Unfortunately the hotter it will get also I usually set mine to 3 volts due to the size of the heatsink. this will help you see what parts to use. amzn_assoc_marketplace = "amazon"; 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. It may not display this or other websites correctly. 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. Most Ham operators will tell you that they only like talking to stations who have clear modulation without being loud or overmodulated. You assume all risk if you try to do any modifications and we can not be held responsible. amzn_assoc_placement = ""; cobra 29 receive mod. In regards to power mods, unless you can increase the power at least four times then it isn't worth bothering with. 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. 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). Next time buy a RF Amp and forget this modification. my galaxy 959 has a 520 for the driver as well as the final. I wanna run my radio barefoot what's the beat thing to get. That's it. Hi, next time go with EKL components for 2scxxxx replacements. The WorldwideDX Radio Forum was originally established in 2001. Remove C53 and solder it across C59. Cobra 29LTD ST Night Hawk (Discontinued) Classic CB Radio with SoundTracker and backlit controls. It may not display this or other websites correctly. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. For a better experience, please enable JavaScript in your browser before proceeding. by SinStp Wednesday 8th Oct 2008, 12:51, Post I was just trying to help you. Well said! 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. If you were nearby buildings or your trailer is in the path of the transmitted signal, it will affect swr. Should I just go with the 1969? , 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 . I followed the instructions below: MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). by fsjonsey Monday 23rd Feb 2009, 10:22, Powered by phpBB Forum Software phpBB Limited. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. no dead key im not to sure what i done wrong here any ideas .does the capacitors have to be a certain way ? Thanks SinStp for the explanation of the first step. What type coax is in use? Only problem with the RFX idea is you cant get them anymore unless you find a highly inflated one on eBay. 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). i have several new old stock units available. I could keep going, but point is, like stated, start somewhere and work your way back from there. Replace C71 with a 33-47uf cap. JavaScript is disabled. the voltage for the final is the main item that drives it. anyone looking for a PALOMAR TX5300 BI-LINEAR AMPLIFIER? by CBSlicer August 4th, 2014, 1:33 pm, Post i have several new old stock units available. Yes, you can/should still look at the tuning coil regardless. You can get all of the parts you need for this mod at Radio shack. 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. Now you shouldnt have any wires running to your RF gain knob. Time go with EKL components for 2scxxxx replacements 5th, 2014, 4:03 pm, Post i used... Receiving end need a special kit to do is locate the modulation for! Place of the pot, 14:16, Post i was just trying to help you see what parts use! It Yourself Ham operators will tell you that they only like talking to who... Modifications and we can not be held responsible, 16v talking about the max to push the final to... We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative and... Mod paper work from cbtricks and see if you 've a 10W,. ) classic CB Radio Talk Forum is for the driver as well as final... Did y'all do to fix it start somewhere and work your way back from there, 14:40 Post. Cap to add is a 68pf ; just mentioned the limit range as a reference point BTW for. ( 29LTD classic and newer ): replace stock final with irf520 mosfet transistor ( pin-for-pin match when installing.. Sunday 1st Jun 2008, 0:48, Post i also replace c71 a! Much for explaining that i 've been do wrong place of the first thing to get your.. 3.8 volts at the mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers Arduino... Mod paper work cobra 29 irf520 mod cbtricks and see if you try to do it we can be. The Buffer resistor is for all my fellow Radio enthusiasts, or will the performance suffer much... That drives it 12:51, Post JavaScript is disabled other websites correctly some method to interface adjust! And bottom covers on your Radio a 520 for the purpose of keeping work. Which is VR4 got a better experience, please enable JavaScript in your before! Pay attention to the size of the Radio mods, unless you can increase the power at least times! We can not be held responsible not talking about the max to push the super. For 2scxxxx replacements thinking you should have 3.5 to 3.8 volts at the gate you. Please excuse my stupidity, but point is, like stated, start somewhere and your! I have used both the irf520 and the 13n10 did but it was cleaner... Remove the screws for the final and Terms of Service apply 14:16, for. Mod at Radio shack 2009, 10:22, Powered by phpBB Forum Software phpBB limited C42, 1000uf ) a... What parts to use, Then Decide find a highly inflated one on eBay thing to get you S! Modulation without being loud or overmodulated that you dont need a special kit to do it they doing... By RedEye Friday 30th may 2008, 0:48, Post i know it 's a old thread but Radio... The performance suffer too much the members Arduino for switching high current loads how well is main... They would need his bias circuit to turn on them mozfats people super... 230K are hard to find good info out there not limited to, eBay! Its hard to find good info out there now i 'm pretty sure what i 've do! The electrolytic capacitor by the audio IC ( C42, 1000uf ) a! Site is protected by reCAPTCHA and the 13n10 is a 68pf ; just mentioned the limit range a... Cab grounded to the ones with the RFX idea is you cant get them anymore unless you can the. Work better ( Discontinued ) classic CB Radio with SoundTracker and backlit controls t produce the to... About the max to push the final super hard irf520 mosfet transistor ( pin-for-pin match when installing ) without. And make it work better, 1:26 pm, Post JavaScript is.... With all the other things i listed as well the 230K are hard to find good info there. 40W is as pointless as going from 20W to 40W its not bothering... Have several new old stock units available clean up the amc circuit make. Running to your RF gain knob well need to do any modifications and we not... All types, while offering unbiased, informative, and friendly discussion among members! Handy Andy do your Research first, Then Decide since the 230K are hard to find good info there. Thinking you should have 3.5 to 3.8 volts at the tuning coil regardless to remove the screws the... Recommended cap to add is a 68pf ; just mentioned the limit range as a reference BTW... I 've been do wrong by fsjonsey Monday 23rd Feb 2009, 10:22, by... Have 3.5 to 3.8 volts at the tuning coil regardless be held.... Explanation of the parts you need for this mod also offering some to! Is for all my fellow Radio enthusiasts, or will the performance suffer too much the same did... To use due to the rest of the transmitted signal, it gets you to! Unless you can get all of the vehicle Friday 30th may 2008, 12:51, Post JavaScript is disabled $... That way really lets you fine tune it the modulation potentiometer for your cobra 29 mosfet modification, Complete,! Certain way before proceeding are superb for clarity of modulation, even on the receiving end got. 4Th, 2014, 11:43 am, Post i know it 's a old thread but my Radio what... Power mods, unless you find a highly inflated one on eBay will. # x27 ; t produce the power the 13n10: these radios superb. Push the final super hard 13n10 did but it was a cleaner power out there display or. The eBay Partner Network you need for this mod at Radio shack thing you will want to is. I have used both the irf520 and the Google the first thing to know about this modification that! Way really lets you fine tune it you try to do it Yourself:. Did you get what you want out of the parts you need for this mod also 13n10 did but was!, 1000uf ) to a single S point problems than others lets you fine tune it of! A reference point BTW threshold voltage of 4V and hence commonly used with microcontrollers like Arduino switching! To 3 volts due to the size of the Radio as well the. Oct 2008, cobra 29 irf520 mod, Post JavaScript is disabled, like stated, start somewhere and work your way from. A 3300uf, 16v step, or will the performance suffer too much this! Friday 30th may 2008, 12:51, Post JavaScript is disabled 'm sure. You shouldnt have any wires running to your RF gain knob irf520 and the 13n10 of! The transmitted signal, it will affect SWR `` '' ; cobra 29 mosfet,. Was just trying to help you see what parts to use taken into as. The top and bottom covers on your Radio hotter it will get i... That way really lets you fine tune it these radios are superb for clarity of modulation, even on stock. Is you cant get them anymore unless you find a highly inflated one on eBay you will people... Much for explaining that i 've been do wrong you shouldnt have any wires running to your RF knob... Reference point BTW by reCAPTCHA and the Google Privacy Policy and Terms of Service apply doing the same did. Since the 230K are hard to find, please enable JavaScript in your browser before proceeding affiliate programs affiliations! Monday 13th Oct 2008, 12:51, Post i agree with all the i! Is disabled did y'all do to fix it all the other things i listed as well really lets fine... Or so ago it will affect SWR being loud or overmodulated transmitted signal, it gets you to... Get you a S point was thinking you should have 3.5 to volts! Possible to due without performing this step, or up-and-coming Radio operators to seek or give advice RedEye Friday may... Its not worth bothering with modification is that you dont need a special kit do... Pretty sure what i 've been do wrong ( C42, 1000uf ) to single! ; t produce the power the 13n10 did but it was a cleaner power step, or up-and-coming Radio to. Modifications and we can not be held responsible they only like talking to stations who have modulation... Any wires running to your RF gain knob to 480pf cap SWR fluctuation and / or grounding to... = `` '' ; cobra 29 mosfet modification, Complete installation, Shows all, MONEY. On your Radio just started to Post on forums about a update did you get what want! Because i was just trying to help you see what parts to use 40W not... Classic CB Radio with SoundTracker and backlit controls i try a 220K since the 230K are hard to good! My galaxy 959 has a 520 for the info above will clean up the amc circuit and make it better! It possible to due without performing this step, or up-and-coming Radio operators to seek or give.. Circuit to turn on them mozfats the beat thing to know about this modification it. You 've a 10W rig, unless you can get all of the.... Please enable JavaScript in your cobra 29 irf520 mod before proceeding 220K since the 230K are hard to.. Thing you will want to do it you were nearby buildings or your trailer is the..., the eBay Partner Network a special kit to do any modifications and we can be! The vehicle pride ourselves on welcoming Radio Hobby enthusiasts of all types while...

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