• cobra 138 139 xlr (old) president grant, wasington,madison , roybn 510 , 520d ,trc-449 457 and 458 1)FIND PIN #19 OF THE 858 CHIP.THIS PIN WILL BE CONNECTED TO GROUND WITH A SMALL TRACE. CUT THE TRACE AND SOLDER A 4.7K OHM RESISTOR ACROSS THE CUT .

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Now if your radio doesn't have an adjustable pot for the modulation adjustment and you're only reaching 60% modulation and have added a power microphone and have turned the mic gain on the radio to max it may be a case where people would suggest clipping the modulation meter. I had a 1993 Cobra 29 LTD Classic turned up at a local cb shop in Grand Rapids, MI. In the same year, 1993. I watched the tech. He turned up 2 pots/shielded coils. Nothing else. Then he checked my swr on my antenna set up. I paid him $35. And I was good to go. On a quiet day I have spoken with other trucks anywhere from 7, up to 12 miles away.

COBRA. 19 Plus, 19 DX, 19 Ultra. Not much can be done to these radios. Replacing the final RF transistor with a 2SC1969 is a plus. ... Adjust the modulation VR pot ... Proper Power & Modulation Adjustments. Everyone seems to be looking for more power and modulation. The 40 channel radios have their modulation limited on AM by the AMC (automatic modulation control). Most have a potentiometer (POT) that controls the amount of maximum modulation the limiter allows the radio to put out. Cobra 148 GTL Power Tweek and Modulation 1) Change R126 to a 2.2k ohm resister. 2) Change R124 to a 4.7k ohm resister. 3) Remove TR24 4) Re-tune L37 and L38 for maximum forward AM power. 5) Adjust VR10 for maximum PEP on AM. 6) Adjust VR11 for maximum PEP on SSB. I do not recommend cutting R131 which limits the modulation.

SLIDE AND ALIGNMENT FOR THE 148GTL MY WAY. MODULATION PROBLEM. Symptom: Crappie Audio 1. - When doing alignment audio output is low, lots of distortion. It makes you look for AGC problem, don't get fooled! It is an Audio Amp problem. Solution: Use O-Scope and a Signal Generator producing about 3uV or S3 on radio meter, 30% modulation.

May 05, 2012 · Cobra 29 is currently inexpensive new, some truckstops have them for around $60-70. A simple adjustment of the modulation control internally (called the AMC) will increase the talk power from around 10w stock to 20w, and increase voice output volume (modulation) by around 30%. The mic that comes with it is fair at best unfortunately.

I had a 1993 Cobra 29 LTD Classic turned up at a local cb shop in Grand Rapids, MI. In the same year, 1993. I watched the tech. He turned up 2 pots/shielded coils. Nothing else. Then he checked my swr on my antenna set up. I paid him $35. And I was good to go. On a quiet day I have spoken with other trucks anywhere from 7, up to 12 miles away. adjusting your modulation Once you decide to take your first jab at doing work on a CB one of the best things to be able to know how to do is internally adjust your radio’s modulation. 90 % of CB radios out there have a potentiometer (basically an adjustable resistor) that is mounted on the radios PC board and controls the level of modulation ... TIPS: You need to have Acrobat Reader version 5 or newer installed to view the files with icon.. If the files with or icon will not display see the Site FAQ for help ...

^^There is nothing true about that statement. Albeit there is nothing you can do with a Cobra 25 except remove/replace the modulation transformer, that's the bottleneck. The TIP120 mod just pinches the carrier off and keep alive mods still produce harmonics. That radio should sound fine at 100% modulation. The Cobra 19 will work fine for you. Don't listen to the idiot who said to get a Cobra 25. What he doesn't no is that the FCC says any CB can only put out 4 watts on AM and 12 on SSB. Neither the 19 nor the 25 have SSB so you don't have to worry about that. Also, the 19 has the same receive board as the 25, so it will receive the same as the 25.

Solder a jumper across the resister going from the base of the Final to the Driver. The output loop coils towards the back part of the radio (usually by the Final) can be spread apart, or pinched together to get maximum forward power. You should see only about 5-7 watt increase. Don't clip the modulation diode. Adjust the modulation VR pot. The Cobra 19 will work fine for you. Don't listen to the idiot who said to get a Cobra 25. What he doesn't no is that the FCC says any CB can only put out 4 watts on AM and 12 on SSB. Neither the 19 nor the 25 have SSB so you don't have to worry about that. Also, the 19 has the same receive board as the 25, so it will receive the same as the 25. Ok for starters, Cobra 19 DX {L5, L6, L801, RV2} The Ls are inductors. Maybe open coils or coils with slugs that can be tuned with a screw driver. RV2 is going to be your modulation adjustment. You can add a super swing kit to just about any radio, I just have to find out where to put it in in this radio. Modulation affects the output power of a CB radio. As modulation increases the peak output increases. The FCC has strict rules regarding the output of CB radios and therefore most CB manufacturers set their radio modulation levels around 80% or lower to make sure that they are well within the FCC regulations.

Cobra 29 LX a few weeks back and was thinking about turning the modulation up on it. Seems easy enough with no harm done to the radio. Just wanted to know how much more of an advantage it would be to get it professionally done?? ^^There is nothing true about that statement. Albeit there is nothing you can do with a Cobra 25 except remove/replace the modulation transformer, that's the bottleneck. The TIP120 mod just pinches the carrier off and keep alive mods still produce harmonics. That radio should sound fine at 100% modulation. Hi, I just purchased a cobra 19 ultra iii, and was wondering if anyone has the scoop on mods for my new toy. I am interested in boosting modulation and peak envelope power.I was told that the cobra 19 dx iv is the same as the ultra iii..so...

vr1 - am/fm s meter adjust vr2 - ssb/cw s meter adjust vr3 - ssb squelch range vr4 - am squelch range vr5 - fm deviation adjust vr7 - carrier balance adjust vr8 - rf meter adjust vr10 - final bias adjust vr11 - driver bias adjust vr12 - alc adjust vr13 - am power adjust vr14 - amc vr16 - cw mon adjust vr21 - tx frequency adjust tr32 - is the ...

Hi, I just purchased a cobra 19 ultra iii, and was wondering if anyone has the scoop on mods for my new toy. I am interested in boosting modulation and peak envelope power.I was told that the cobra 19 dx iv is the same as the ultra iii..so...

May 05, 2012 · Cobra 29 is currently inexpensive new, some truckstops have them for around $60-70. A simple adjustment of the modulation control internally (called the AMC) will increase the talk power from around 10w stock to 20w, and increase voice output volume (modulation) by around 30%. The mic that comes with it is fair at best unfortunately. ^^There is nothing true about that statement. Albeit there is nothing you can do with a Cobra 25 except remove/replace the modulation transformer, that's the bottleneck. The TIP120 mod just pinches the carrier off and keep alive mods still produce harmonics. That radio should sound fine at 100% modulation.

Proper Power & Modulation Adjustments. Everyone seems to be looking for more power and modulation. The 40 channel radios have their modulation limited on AM by the AMC (automatic modulation control). Most have a potentiometer (POT) that controls the amount of maximum modulation the limiter allows the radio to put out. vr1 - am/fm s meter adjust vr2 - ssb/cw s meter adjust vr3 - ssb squelch range vr4 - am squelch range vr5 - fm deviation adjust vr7 - carrier balance adjust vr8 - rf meter adjust vr10 - final bias adjust vr11 - driver bias adjust vr12 - alc adjust vr13 - am power adjust vr14 - amc vr16 - cw mon adjust vr21 - tx frequency adjust tr32 - is the ...

Cobra 29 modulation adjustment. ... #19 805 california ... But the ones I did work on did far better than 60% modulation and a nasty output w/ NO removed/slinkied ... ^^There is nothing true about that statement. Albeit there is nothing you can do with a Cobra 25 except remove/replace the modulation transformer, that's the bottleneck. The TIP120 mod just pinches the carrier off and keep alive mods still produce harmonics. That radio should sound fine at 100% modulation. I had a 1993 Cobra 29 LTD Classic turned up at a local cb shop in Grand Rapids, MI. In the same year, 1993. I watched the tech. He turned up 2 pots/shielded coils. Nothing else. Then he checked my swr on my antenna set up. I paid him $35. And I was good to go. On a quiet day I have spoken with other trucks anywhere from 7, up to 12 miles away. Probably won't get much out of it but, I have opened up some of the older Cobra 19's like the ST model. Inside you will see 3 pots smack dab in front of you and they are clearly labeled. One is the meter, one is the sqeulch, and the other is rf output Turn it up and see. I got a couple extra watts out of a friends 19. The ultra should be similar. Cobra 19 Ultra III-any adjustments? ... Cobra 146gtl modulation question: ... Modifications" section is for posting questions for the tech about modifications of any ...

cobra 19 ultra 3 tune up, cobra 19 modulation, mods for the cobra 19 ultra iii, wrapperios, boost cobra 19 cb, can you turn up a cobra 19 dxIV, cobra 19 dx mods, cobra 19 dxiv modulation pot, how to adjust modulation on cobra 19 ultra iii cb tricks, cobra 10 ultra mofs, cobra 19 ultra 3 tuning pots, mods for the cobra 19 dxIV, mod cobra 19 dx ... Proper Power & Modulation Adjustments. Everyone seems to be looking for more power and modulation. The 40 channel radios have their modulation limited on AM by the AMC (automatic modulation control). Most have a potentiometer (POT) that controls the amount of maximum modulation the limiter allows the radio to put out.

Adjusting the modulation for maximum output without distortion. Aligning the receiver for optimum signal to noise ratio. Adjusting the squelch range Calibrate the transmit and receive meter settings. Frequency adjustment to zero tolerance. Perform a complete check of all functions. Perform a visual of the circuit board for flaws.

Ok for starters, Cobra 19 DX {L5, L6, L801, RV2} The Ls are inductors. Maybe open coils or coils with slugs that can be tuned with a screw driver. RV2 is going to be your modulation adjustment. You can add a super swing kit to just about any radio, I just have to find out where to put it in in this radio.

adjusting your modulation Once you decide to take your first jab at doing work on a CB one of the best things to be able to know how to do is internally adjust your radio’s modulation. 90 % of CB radios out there have a potentiometer (basically an adjustable resistor) that is mounted on the radios PC board and controls the level of modulation ...

Cobra 19 Ultra III-any adjustments? ... Cobra 146gtl modulation question: ... Modifications" section is for posting questions for the tech about modifications of any ... A page which list's the modulation boosts and tune ups for the cobra range of radio's cobra 138 139 xlr (old) president grant, wasington,madison , roybn 510 , 520d ,trc-449 457 and 458 1)FIND PIN #19 OF THE 858 CHIP.THIS PIN WILL BE CONNECTED TO GROUND WITH A SMALL TRACE. CUT THE TRACE AND SOLDER A 4.7K OHM RESISTOR ACROSS THE CUT . You really need a Dummy load so your not transmitting a signal while your adjusting. I like to set the AM dead key less than 3 watts and 100 % modulation with the mic gain at full open. SSB transmit power is all modulation there should be no carrier present any thing more than 100% is self defeating.

Adjusting the modulation for maximum output without distortion. Aligning the receiver for optimum signal to noise ratio. Adjusting the squelch range Calibrate the transmit and receive meter settings. Frequency adjustment to zero tolerance. Perform a complete check of all functions. Perform a visual of the circuit board for flaws.

Cobra (Dynascan) Secret CB Index By Model Documentation Project CBTricks.com Model: ... 19 Plus Modulation Adjust: 28. 30. 19GTL TC9109P PLL Tune-Up: 12. 34.

cobra 138 139 xlr (old) president grant, wasington,madison , roybn 510 , 520d ,trc-449 457 and 458 1)FIND PIN #19 OF THE 858 CHIP.THIS PIN WILL BE CONNECTED TO GROUND WITH A SMALL TRACE. CUT THE TRACE AND SOLDER A 4.7K OHM RESISTOR ACROSS THE CUT .

Feb 10, 2010 · This is a cobra 19 DX III that i managed to tune to a 20 watt swing and have a 5 watt deadkey, i also installed talkback and a turbo TRB-1 echo board. ... How to adjust modulation inside a CB ...

CB RADIO Mods. COBRA. 148 GTL. ... You can also adjust VR7 for a little increase in modulation, but watch it on SSB. ... you can use the ch9-19 switch and the NB/ANL ... Now if your radio doesn't have an adjustable pot for the modulation adjustment and you're only reaching 60% modulation and have added a power microphone and have turned the mic gain on the radio to max it may be a case where people would suggest clipping the modulation meter. Cobra 29 modulation adjustment. ... #19 805 california ... But the ones I did work on did far better than 60% modulation and a nasty output w/ NO removed/slinkied ... Hi, I just purchased a cobra 19 ultra iii, and was wondering if anyone has the scoop on mods for my new toy. I am interested in boosting modulation and peak envelope power.I was told that the cobra 19 dx iv is the same as the ultra iii..so...

Cobra 29 LX a few weeks back and was thinking about turning the modulation up on it. Seems easy enough with no harm done to the radio. Just wanted to know how much more of an advantage it would be to get it professionally done?? Adjusting the modulation for maximum output without distortion. Aligning the receiver for optimum signal to noise ratio. Adjusting the squelch range Calibrate the transmit and receive meter settings. Frequency adjustment to zero tolerance. Perform a complete check of all functions. Perform a visual of the circuit board for flaws. COBRA. 19 Plus, 19 DX, 19 Ultra. Not much can be done to these radios. Replacing the final RF transistor with a 2SC1969 is a plus. ... Adjust the modulation VR pot ...

cobra 138 139 xlr (old) president grant, wasington,madison , roybn 510 , 520d ,trc-449 457 and 458 1)FIND PIN #19 OF THE 858 CHIP.THIS PIN WILL BE CONNECTED TO GROUND WITH A SMALL TRACE. CUT THE TRACE AND SOLDER A 4.7K OHM RESISTOR ACROSS THE CUT . SLIDE AND ALIGNMENT FOR THE 148GTL MY WAY. MODULATION PROBLEM. Symptom: Crappie Audio 1. - When doing alignment audio output is low, lots of distortion. It makes you look for AGC problem, don't get fooled! It is an Audio Amp problem. Solution: Use O-Scope and a Signal Generator producing about 3uV or S3 on radio meter, 30% modulation.

The Cobra 19 peaks at 12 watts by only turning up the modulation pot. If you want to get greedy and cut the mod limiter it will sound like azz. The 510 does not have a tunable pot as I remember. (Mine was an older 510 though, the new ones may have one). So as far as power goes, the 19 far outdoes the 510 without having to really start modding it.

Modulation affects the output power of a CB radio. As modulation increases the peak output increases. The FCC has strict rules regarding the output of CB radios and therefore most CB manufacturers set their radio modulation levels around 80% or lower to make sure that they are well within the FCC regulations. Cobra CB Radio Mods ... 19 GTL. VR6 or CUT D9 ... CUT TR32 Change R99 to a 2.2k resistor Change R94 to a 2.2k resistor Adjust L36,L37 for max RF output AM Power VR6 ...

Ok for starters, Cobra 19 DX {L5, L6, L801, RV2} The Ls are inductors. Maybe open coils or coils with slugs that can be tuned with a screw driver. RV2 is going to be your modulation adjustment. You can add a super swing kit to just about any radio, I just have to find out where to put it in in this radio. COBRA. 19 Plus, 19 DX, 19 Ultra. Not much can be done to these radios. Replacing the final RF transistor with a 2SC1969 is a plus. ... Adjust the modulation VR pot ...

May 05, 2012 · Cobra 29 is currently inexpensive new, some truckstops have them for around $60-70. A simple adjustment of the modulation control internally (called the AMC) will increase the talk power from around 10w stock to 20w, and increase voice output volume (modulation) by around 30%. The mic that comes with it is fair at best unfortunately. There are other Cobra 21s also. 1-Cobra 21 2-Cobra 21-A 3-Cobra 21-GTL 4-Cobra 21-LTD 5-Cobra 21-LTD Classic 6-Cobra 21-Plus 7-Cobra 21-X 8-Cobra 21-XLR If you have the 21-LTD "Classic", then the mods are a bit different than the standard LTD model. For the 21-LTD Classic, adjust VR-4 or cut D-7 to open up the modulation. Cobra 29 LX a few weeks back and was thinking about turning the modulation up on it. Seems easy enough with no harm done to the radio. Just wanted to know how much more of an advantage it would be to get it professionally done??

Cobra 19 Ultra III-any adjustments? ... Cobra 146gtl modulation question: ... Modifications" section is for posting questions for the tech about modifications of any ... Jan 05, 2011 · DISCLAIMER - While adjusting modulation above 100% can produce louder sounding audio it can also result in distortion and "splatter" to other frequencies. The decision to do these modifications is ... There are other Cobra 21s also. 1-Cobra 21 2-Cobra 21-A 3-Cobra 21-GTL 4-Cobra 21-LTD 5-Cobra 21-LTD Classic 6-Cobra 21-Plus 7-Cobra 21-X 8-Cobra 21-XLR If you have the 21-LTD "Classic", then the mods are a bit different than the standard LTD model. For the 21-LTD Classic, adjust VR-4 or cut D-7 to open up the modulation.

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There are other Cobra 21s also. 1-Cobra 21 2-Cobra 21-A 3-Cobra 21-GTL 4-Cobra 21-LTD 5-Cobra 21-LTD Classic 6-Cobra 21-Plus 7-Cobra 21-X 8-Cobra 21-XLR If you have the 21-LTD "Classic", then the mods are a bit different than the standard LTD model. For the 21-LTD Classic, adjust VR-4 or cut D-7 to open up the modulation. Cobra CB Radio Mods ... 19 GTL. VR6 or CUT D9 ... CUT TR32 Change R99 to a 2.2k resistor Change R94 to a 2.2k resistor Adjust L36,L37 for max RF output AM Power VR6 ... Cobra 29 modulation adjustment. ... #19 805 california ... But the ones I did work on did far better than 60% modulation and a nasty output w/ NO removed/slinkied ...

There are other Cobra 21s also. 1-Cobra 21 2-Cobra 21-A 3-Cobra 21-GTL 4-Cobra 21-LTD 5-Cobra 21-LTD Classic 6-Cobra 21-Plus 7-Cobra 21-X 8-Cobra 21-XLR If you have the 21-LTD "Classic", then the mods are a bit different than the standard LTD model. For the 21-LTD Classic, adjust VR-4 or cut D-7 to open up the modulation. The Cobra 29 LTD super modulation modification It's one of the most popular modifications to have done to your CB radio. 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.

SLIDE AND ALIGNMENT FOR THE 148GTL MY WAY. MODULATION PROBLEM. Symptom: Crappie Audio 1. - When doing alignment audio output is low, lots of distortion. It makes you look for AGC problem, don't get fooled! It is an Audio Amp problem. Solution: Use O-Scope and a Signal Generator producing about 3uV or S3 on radio meter, 30% modulation. Hi, I just purchased a cobra 19 ultra iii, and was wondering if anyone has the scoop on mods for my new toy. I am interested in boosting modulation and peak envelope power.I was told that the cobra 19 dx iv is the same as the ultra iii..so...

You really need a Dummy load so your not transmitting a signal while your adjusting. I like to set the AM dead key less than 3 watts and 100 % modulation with the mic gain at full open. SSB transmit power is all modulation there should be no carrier present any thing more than 100% is self defeating.

I have noticed that on the PC122 XL that the AMC adjustment does not have enough range, on the track side of the PCB there is a resistor near the preset resistor location, removing it gives more AMC adjustment range, see my pics below. Feb 10, 2010 · This is a cobra 19 DX III that i managed to tune to a 20 watt swing and have a 5 watt deadkey, i also installed talkback and a turbo TRB-1 echo board. ... How to adjust modulation inside a CB ...

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Cobra 18WXST CB Weatherband Radio Cobra 19 Ultra 2 Compact Mobile CB Radio ... Just turn up VR-4 for Max modulation, Adjust L17, L20, L21, L16 and L14 for max RF output.

^^There is nothing true about that statement. Albeit there is nothing you can do with a Cobra 25 except remove/replace the modulation transformer, that's the bottleneck. The TIP120 mod just pinches the carrier off and keep alive mods still produce harmonics. That radio should sound fine at 100% modulation.

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SLIDE AND ALIGNMENT FOR THE 148GTL MY WAY. MODULATION PROBLEM. Symptom: Crappie Audio 1. - When doing alignment audio output is low, lots of distortion. It makes you look for AGC problem, don't get fooled! It is an Audio Amp problem. Solution: Use O-Scope and a Signal Generator producing about 3uV or S3 on radio meter, 30% modulation. ®Reddit anime fairy tail®700r4 transmission identificationCitta me yatsuSetup box unlock
You really need a Dummy load so your not transmitting a signal while your adjusting. I like to set the AM dead key less than 3 watts and 100 % modulation with the mic gain at full open. SSB transmit power is all modulation there should be no carrier present any thing more than 100% is self defeating.
Cobra 29 modulation adjustment. ... #19 805 california ... But the ones I did work on did far better than 60% modulation and a nasty output w/ NO removed/slinkied ...
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^^There is nothing true about that statement. Albeit there is nothing you can do with a Cobra 25 except remove/replace the modulation transformer, that's the bottleneck. The TIP120 mod just pinches the carrier off and keep alive mods still produce harmonics. That radio should sound fine at 100% modulation. cobra 19 ultra 3 tune up, cobra 19 modulation, mods for the cobra 19 ultra iii, wrapperios, boost cobra 19 cb, can you turn up a cobra 19 dxIV, cobra 19 dx mods, cobra 19 dxiv modulation pot, how to adjust modulation on cobra 19 ultra iii cb tricks, cobra 10 ultra mofs, cobra 19 ultra 3 tuning pots, mods for the cobra 19 dxIV, mod cobra 19 dx ...
Ok for starters, Cobra 19 DX {L5, L6, L801, RV2} The Ls are inductors. Maybe open coils or coils with slugs that can be tuned with a screw driver. RV2 is going to be your modulation adjustment. You can add a super swing kit to just about any radio, I just have to find out where to put it in in this radio. I have noticed that on the PC122 XL that the AMC adjustment does not have enough range, on the track side of the PCB there is a resistor near the preset resistor location, removing it gives more AMC adjustment range, see my pics below.
Modulation affects the output power of a CB radio. As modulation increases the peak output increases. The FCC has strict rules regarding the output of CB radios and therefore most CB manufacturers set their radio modulation levels around 80% or lower to make sure that they are well within the FCC regulations. cobra 19 ultra 3 tune up, cobra 19 modulation, mods for the cobra 19 ultra iii, wrapperios, boost cobra 19 cb, can you turn up a cobra 19 dxIV, cobra 19 dx mods, cobra 19 dxiv modulation pot, how to adjust modulation on cobra 19 ultra iii cb tricks, cobra 10 ultra mofs, cobra 19 ultra 3 tuning pots, mods for the cobra 19 dxIV, mod cobra 19 dx ...