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#1
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Cobra 25LTD Classic tune up
I have an old (Aug 1991) 25 LTD Classic someone just gave me and it all
works except it`s just factory stock in everyway and doesn`t put out worth a damn...I`ve been away from the game so long I`ve lost all my notes on the various tricks to tune it up beyond swapping out the final and driver..Clip this..change that...?...Maybe some of the old timers who remember me and know I`m cool can lend a hand..Send me an e-mail if you want to avoid the trolls who`ll turn this into an anti-keyclown thread |
#2
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Cobra 25LTD Classic tune up
Programbo wrote:
I have an old (Aug 1991) 25 LTD Classic someone just gave me and it all works except it`s just factory stock in everyway and doesn`t put out worth a damn...I`ve been away from the game so long I`ve lost all my notes on the various tricks to tune it up beyond swapping out the final and driver..Clip this..change that...?...Maybe some of the old timers who remember me and know I`m cool can lend a hand..Send me an e-mail if you want to avoid the trolls who`ll turn this into an anti-keyclown thread www.cbtricks.com It's easier to leave it stock and run it into a small 2 pill amp. They sound better that way. |
#3
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Cobra 25LTD Classic tune up
They sound like crap stock..No modulation..With a 2 pill it would still
sound like crap just much louder |
#4
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Cobra 25LTD Classic tune up
Are you crazy... that unit can be made to have tremendous modulation.
Professor www.telstar-electronics.com |
#5
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Cobra 25LTD Classic tune up
Are you crazy... that unit can be made to have tremendous modulation
Was that directed at me or Scotty?..They way Google displays the posts it came out under mine so I`m not sure....I actually said that it sounds like crap and has no modulation BEFORE you do anything to it..I`m very aware it can be made quite loud and proud with the right tricks |
#6
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Cobra 25LTD Classic tune up
Programbo wrote:
They sound like crap stock..No modulation..With a 2 pill it would still sound like crap just much louder OK. I've got one on the shelf. I don't use AM only radios. I know it works. I tried it once. Anybody make an offer for it. Shipping would be actual postage from 212.. I should clean up this Uniden PC76XL and get that off my shelf, too. Also a TRC-422 and a TRC-422A just sits and sits. I'm not sure if I should sell the Regency Range Gain, Lafayette LMS-40, Midland 76-858, and forget about my 2950. I spent good money on the LMS-40 to get it repaired because some dork had tried to put extra channels in it and had really butchered it. I'd have to sell that one for at least $100. It's in good shape externally. I also have a lightning struck 148GTL. The owner said it's DOA. I'm not going to bother testing it. His A99 was toothpicks in the yard! DONTSPAMME is every other letter in my email addy. Remove that to reply. Serious inquiries only. Leave a phone number in the email for call back and give a time referenced to a timezone to call on my dime. |
#7
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Cobra 25LTD Classic tune up
Hello All:
I am hearing that many guys are addeding in another modulation IC, and Modulation transformer to double the audio power, allowing a higher carrier power to be 100% modulated. Jay in the Mojave Professor wrote: Are you crazy... that unit can be made to have tremendous modulation. Professor www.telstar-electronics.com |
#8
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Cobra 25LTD Classic tune up
On Sun, 19 Feb 2006 15:40:53 -0800, Jay in the Mojave
wrote: +Hello All: + +I am hearing that many guys are addeding in another modulation IC, and +Modulation transformer to double the audio power, allowing a higher +carrier power to be 100% modulated. + +Jay in the Mojave ****** The carrier in Double Sideband Full Carrier Amplitude Modulation should remain constant during modulation. If not, then you have a far greater problem. james |
#9
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Cobra 25LTD Classic tune up
james wrote:
On Sun, 19 Feb 2006 15:40:53 -0800, Jay in the Mojave wrote: +Hello All: + +I am hearing that many guys are addeding in another modulation IC, and +Modulation transformer to double the audio power, allowing a higher +carrier power to be 100% modulated. + +Jay in the Mojave ****** The carrier in Double Sideband Full Carrier Amplitude Modulation should remain constant during modulation. If not, then you have a far greater problem. james Hello James: No thats not how AM works. The Modulation increases and decreses the amptitude during Modulation. Thats how double sidband full modulation works. Look in a old ARRL Book. Jay in the Mojave |
#10
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Cobra 25LTD Classic tune up
******
The carrier in Double Sideband Full Carrier Amplitude Modulation should remain constant during modulation. If not, then you have a far greater problem. james Hello James: No thats not how AM works. The Modulation increases and decreses the amptitude during Modulation. Thats how double sidband full modulation works. Look in a old ARRL Book. Jay in the Mojave Jay, I respectfully disagree. An AM carrier doesn't change, just sidebands are added in the mixing (modulation) process, and the instantaneous voltage shown on an o-scope will be 4 times greater then the carrier power itself. Since the audio added is 50% of the carrier, the RMS power will be 150% of the unmodulated carrier. The peak to peak voltage is greater. Put a 1000 Hz tone on a signal and look at it on spec-an. (make sure to do this test with an unmodified radio, "swing kits" ruin proper AM) |
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