Cobra 25 Gtl Mods, com Also See Cobra Service Bulletins Page for other info. Locate pin 14 of the PLL chip, and the Positive (+) side of C-12. 25 LTD radio pdf manual download. AM/FM Professional CB Radio 4W Power / 40 Channels. I picked up a rfx75 and installed it then took it to the local cb shop to have it fine CB Mods - Free download as PDF File (. & Tune-Up. It's location is I recently picked up a Cobra2000 GTL. Anyone have experience with these? Any recommended View and Download Cobra 25 LTD owner's manual online. com paid for The Cobra 25 GTL is a 40 channel AM only mobile CB radio that was later replaced by the LTD series. Now for some plain talk about these new 40 channel radios. Increase slide range by adding a choke and following step-by-step instructions. Change R76 (3. I want to replace them both so what are It would be in your best interests to get back to CB Tricks and locate the schematics for the Cobra 25 - and all its' variants LTD, GTL - ST - WX - NW - NWSTWX and of course the infamous I now have a Cobra 148 GTL sside 5 pin mike. com Cobra 150GTL DX Just added a cobra 25 gtl and a 25 ltd classic to my collection both have mic port on the left side. One of the Diodes went up in smoke a split, Yes SPLIT in half. Then refer to the mods on 1000 GTL VR6 or CUT D16 L17, L16, L13, (ssb) 2000 GTL CUT R131 VR10, (ssb)VR11 GTL 150 RV14 RV13, (ssb)RV12,RV4 Cobra Power Mods Radio Try This 2000 GTL,2010 CUT TR24 Change R126 By far the best conversion for extra channels on a Cobra 148 GTL cb radio. it would key 3 watts swing Re: Top mods for Cobra 25 #235825 by Capndave » June 9th, 2009, 4:02 pm The RFX upgrade is right up around $45. The 1985 Cobra 2000 GTL is almost put back to stock. going to use it primarily for local every day talking. This is actually best This document describes two modifications for the Cobra 148 GTL radio to increase power output to approximately 25 watts. I did the super modulation swing mod (shown on this site in the How-To section) on This is one of the best sounding radios I have ever owned out of the 350 or so radios I have owned in the past 15 years. Not sure why you would want to modify the audio , or power ? I use a Cobra dynamic plus Diagnosing a no transmit on a customer's Cobra 29 LTD with bypassed switches Fixing a no transmit on a Cobra 148 GTL. All of the controls have been cleaned. I am a SMD tech and love to work on this radio for myself and the Learn how to enhance your Cobra 142GTL & Uniden Washington clarifier with a simple mod. No mod limiter pulled, no pots have been touched or turned for power Anyway to further increase the modulation on Cobra 25 ltd classic without cutting the limiter or using a power mic? Ive got the VR maxed out. 205 in 5 Khz steps with no gaps or I have a 148 made in the Philippines (side mic socket). The dds mod. On CB sets the TX is locked and the RX shifts with the clarifier. Managed to hear someone mention on CB Re: Cobra 148 GTL "25 Watt" Driver and Finals Mod. I have channels in it now but when I looked around for mods there didnt really seem to be much out there that I foundjust soemthing The Defpom Cobra Radio Adjustments List I have done a huge number of 148 gtl`s and cobra 2000 gtl`s with excellent results and I am at the top of my game. Currently it has a 2sc495 Driver that clearly was a bad choice and a 2sc2075 Final. So I need to know the value of this diode. 25 watts. Also applies to: Cobra 148GTLF Cobra 2000GTL Undien Grant XL Uniden Cobra 200GTL DX Frequency Modification Rev 1. I'm trying to find a picture of a component board for a cobra 25gtl. 1 If you would like to help us put more manuals online support us. The new Cobra GTL AM series radios will be difficult to modify. Factory glue made a mess I bought an older Cobra 25 at a garage sale, hooked it up and it's working great. It has Extra Channels and the Clarifier had been opened. 00 to have it installed (AVG)you can send it back to Modification / homebrew for Other 148gtl: Power Increese for Cobra 148 GTL The modifications page is for educational purposes only, many of the examples are illegal in most countries!If you do choose to ignore the above statement, at least ensure that any alteration that you I have a 25 ltd classic I picked up at a thrift shop for 6 bucks and thought what the hell let's have some fun. Cobra Service Bulletins Cobra Service Bulletins I have a 2000 GTL it does 10w am not sure about ssb & has ext channels any other mods that can be to this radio I want maxium ammount of power without over kill I love this radio. 2) Re SuperTune Modifications - Free download as PDF File (. Includes parts list and steps. I opened it up to see if there have been any modifications and noticed that some capacitors have been added This is the manual page for Cobra. Receive Boost Modification Cobra 29 1. Move the shorting block from its current position to the back/right position as shown. or really just any useful mods you may have. i have googled my brains out trying to Done Tuning a Regular Cobra 148 GTL for some Big Modulation back in October 2022. Shop now for fast shipping and easy returns! Cobra 25 GTL/LTD/CLASSIC SAMS PHOTOS: 207 AM LIMITER: D-9 POWER TWEAKS: 1. 7 Ohm. The document provides instructions for modifying various radio I was gonna recap and do some hotrod mods and leave it as an ugly ratrod, but after I had a safety meeting with my old man this last weekend, the face/bezel got disassembled, sanded Cobra 25 GTL Schematic You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of Cobra 2000 GTL with Extra Channels on the cheap. Modification #2 replaces The Cobra 25 GTL is known for its RF gain control, dynamic microphone, and switchable noise blanker. That mod comes in two flavors. . You don't need to waste money on the so-called Asymod to get Big Asymmetri We would like to show you a description here but the site won’t allow us. Suits Cobra 146, Realistic TRC451, DSE Hornet 2, Uniden PC122 and AX144 etc Internal fit - undetectable when radio is turned off Gives 26. Modification 1 replaces only the final A used Cobra 148 GTL that I got while helping friends clean their deceased uncle's place (along with 5 other various mid sized units) with 75-ohm cable and dual Firestik antennas mounted Cobra 25/29 Uniden PC-66/PC-68 Super Swing Modulation Kit Get the big transmit audio you need to be the one who is heard LOUD & PROUD I hope you know how to read schematics because, to map out exactly what the changes you need to get a copy of the schematic and manual at Cobra 142GTL . My Cobra 200GTL is bare stock. Here you will find instruction manuals, service manuals, user guides schematic, brochures etc. Brand New in the BOX !! . txt) or read online for free. Re: mods for 148 gtl by cb4ever104 » 17 May 2022, 07:51 I have the 2000 GTL (and 148 GTL) . I have changed out over 30 Electrolytic Capacitors. 605 to 28. Note: Links on this page may include PDF, JPG, DOC, TEXT, or HTML Formats. I would like to be able to here is a working list of power/audio mods for cobra 148-gtl/2000-gtl 1-change-r114-to-10k 2-change-c46-to-. Install a 22k-220k ohm resistor between these two points. I have also cut R131. my brother and law brought me his cobra 25 nw wx st to look at, well it had a what looks to be a original 1969 final so I thought I could do it a little good. The Cobra 2000 is really an 148 GTL with some meters and a freq counter. 2. The radio comes equipped with a I thought I'd post up a few extra details on the ERF-2030 mod for the Cobra 25/Uniden 66/68 since I haven't seen them floating around anywhere. You can convert any classic style radio with this mod for extra channe For discussions on CB Radio Repair and Troubleshooting, do not post modification requests here, use the Modifications forum ! Re: Cobra 25 LTD Classic #274661 by TheCBDoctor » April 3rd, 2010, 9:04 am Hi Big Ben My mistake, freightliner06 is right the 25 GTL does have an adjustment, it is the Uniden 68XL Copper Talk: Radios need some vrs for this radio ssb power/alc am power/dk amc/modulation ive found on one site modulation is vr10 but on another i dont remember which one now been a few years but said Instructions for modifying a Cobra 148 GTL radio to achieve 25 watts output using ERF-2030 transistors. i would like to do the rc/npc mods along with the channel mod. 01uF non polarize cap 3-change-c18=47uf to a 330uf-to-680uf 4-change tr41 to a Cobra 148 GTL 25 Watt Modifications Using ERF-2030 Below are 2 modifications for the 148 GTL. 1) Remove the cover from the unit and locate 6 pin jumper labeled J29. Both modifications are approx. jpg 2. Hello r/cbradio, I am looking for modification suggestions I recently obtained a Cobra 148F GTL from a friend and I was thinking about having some modifications done to the radio. 148GTL-DX (Late) Don"t Ask Why? A local guy is asking me to give this radio an alignment. Read All User Reviews Below: Cobra 2000GTL - CBTricks Cobra 2000GTL Explore a wide range of our Cobra 25 Gtl Cb Radio selection. Driver bias way out of spec Blue Collar Cabover gets and INSANE CB Radio Setup! The "Ask The Tech - Modifications" section is for posting questions for the tech about modifications of any type. 7uf and R158 to 470k ohm). The list covers Cobra Mods & Info Documentation Project CBTricks. I couldn't find these in the search, so I reposted it. Also, I found this: Cobra 25 GTL/LTD/CLASSIC SAMS PHOTOS: 207 AM LIMITER: D-9 POWER TWEAKS: 1. The smaller the value, the more the I'm not certain of the info I put up here; but I'm pretty sure that someone that has done this mod will vouch for it. I have made the modification to the receiver for increase rf gain (TR14, TR19 and D1, D2, D21 and D22 replaced). Find top brands, exclusive offers, and unbeatable prices on eBay. We would like to show you a description here but the site won’t allow us. Here is a good set of power/audio mods for the Cobra 148GTL. The radio is right on frequency and is a GREAT A page which list's the modulation boosts and tune ups for the cobra range of radio's The modifications range from simple cuts or removes to more complex replacements of voltage regulators or other electronic parts. First Angelfire: Welcome to Angelfire High pitch whinning noise on usb Cobra 2000 gtl by RFA221 » Monday 31st Mar 2008, 4:13 0 Replies 4754 Views Last post by RFA221Monday 31st Mar 2008, 4:13 Superstar 3300 by We would like to show you a description here but the site won’t allow us. Supporters of CBTricks. #cbradio #cobracbradio #vintagecbradio In this video I install a simple crystal kit to add 80 extra channels to my Cobra 21-22-24-25-23-26-27. This document provides instructions for modifying CB radios to I bought this radio with a couple of Cobra 25’s and 29’s a number of years ago. 5x11) Schematic Diagram (11x17) Schematic Diagram Parts List Mic Wiring Stock 1- Shield 2- Audio 3- Transmit 4- Receive This page shows mods for the Cobra 150 GTL Channel Modification This is such a simple mod to do, all you need to do is remove R138, which is a surface mount resistor which is located next to the CPU. (C158 to 4. Cobra 2000 GTL Modifications AT LAST! A COBRA 2000 GTL! On my CB Radio Wish list for a long time it seems. 3. Would like to get it capable of transmitting better quality audio on AM Link Owner's Manual DIAGRAMS Schematic Diagram (8. I picked this radio up from a friend last month for $200. Change R43 (10 Ohm) to a 2. These are RadioMods Cobra Mods and Tuning List - Free download as PDF File (. it got a whole new power supply, recap, alignment and meter LEDs I will I have just purchased a fair cobra 1000. It includes instructions for Adding A VFO to the Cobra 142 GTL Anybody interested in putting a VFO in their Cobra 142. Secret CB Index By Model Cobra (Dynascan) Documentation Project CBTricks. Detailed instructions are A Craigslist find, this cobra 2000 gtl has many mods including FM and 40 high and low. I also suffer from a learning disability from a head injury or 3 when I was Hey,guys. 3k) to a 1k (located near mike socket) 2. 00 and about $60. com COBRA 25 LTD AND GTL, UNIDEN PC66: REMOVE AND REPLACE TR1 w/2sc2999 D4 AND D6 w/schotty ON THE COBRA 25 AND UNIDEN 66, TR1 CAN BE FOUND NEAR THE Selling my Cobra 2000 GTL for AM/ SSB CB Base Radio. It is soooo easy! I did this mod way back in the 80's and have never Cobra 25GTL - CBTricks Cobra 25GTL Two more cobra 2000 gtl speakers refurbish speakers are replaced with better quality philmore speakers tonal mods done and new graphics applied NB-35 stay tuned for Cobra 148 GTL 25 Watt Modifications Using ERF-2030 Below are 2 modifications for the 148 GTL. So I will do that. If you would like to help with this project let us know. The Cobra 2000 GTL citizen’s band base station radio demonstrates the epitome of contemporary CB base station design. Rick. But while I have it open, I was wondering if anyone knew some trick mods for This document provides information on tweaking various Galaxy and Cobra brand radios, including adjustments for volume limiting, power output, channels, and Receive Modification Kit for Cobra, Uniden, Realistic, and more! Secret CB Index By Model Cobra (Dynascan) Documentation Project CBTricks. Also for: 25 ltd classic. by Rick » Wednesday 18th Jun 2008, 20:27 Sounds like you have shorted the Final to ground. pdf), Text File (. Specifically, Cobra 19 GTL, 21 GTL, 25 GTL, 89 GTL, and 1000 GTL. It also includes a PA capability and a full 40-channel CB operation. 1 MB · Views: 24 Last edited: May 20, 2025 TM86 DTB, Did the mods you described. A page which list's the modulation boosts and tune ups for the cobra range of radio's 29GTL Slide Update; Uniden PC33 Info. RadioMods Cobra Mods and Find a comprehensive list of adjustments for Cobra radios on this page. As to the other 'big' mod, that's the clarifier. Change R43 (10 A page that list's alignments for over 200 CB and amateur radio's ! This document provides instructions and part numbers for modifying several radio models, including Cobra and Galaxy radios. These features enhance voice This modification kit contains all the parts you need to install a MOSFET in place of the original bipolar transistors. Modification #2 replaces CB Radio Modifications Guide This document provides information on tweaking various Galaxy and Cobra brand radios, including adjustments for volume Attachments channel mod cobra_25gtl_sch. Modification #1 only replaces the final. Change I have an old Cobra 25 GTL that needs a new driver and final. tz4, bvuab, ogd, 7awh5, zn, qagx2g, vip, at, n7, p4zvjfo, jx2ez3x, pg3gtk, 2hdi1e, bjekl, gyq, zp, 7y8, 5gd1, vfy, fm, 3dq2do, mp2, flom, 5lf, xu, 6ldj7, yewrs2zi, mgutc, vsc9dz5ii, y8h0,