Home |
Search |
Today's Posts |
#21
|
|||
|
|||
Cobra 25LTD Classic tune up
"Lancer" wrote in message
news:dup3d90rlj0sr6humn29tofaalq2mf2sl6@2355323778 ... On Tue, 21 Feb 2006 15:41:02 -0600, "Dr.Death" wrote: wrote in message ... Are you crazy... that unit can be made to have tremendous modulation. Professor www.telstar-electronics.com BZZZT! Wrong....Keyclowns are not allowed to modify their radios. But we will anyway. And for no other reason that to **** him off, right? You betcha : ) |
#22
|
|||
|
|||
Cobra 25LTD Classic tune up
"Scott in Baltimore" wrote in message
. .. What does the case and face plate look like. My 148 could use some cosmetic surgery. I got your email. I've been busy. Will disassemble soon. Wait for email with pictures. Phillipines unit, side mike. Great, thanks Scott. |
#23
|
|||
|
|||
Cobra 25LTD Classic tune up
"Dr.Death" wrote:
"Lancer" wrote in message And for no other reason that to **** him off, right? You betcha : )\ .....SHOCKING! |
#24
|
|||
|
|||
Cobra 25LTD Classic tune up
Lancer wrote:
Thanks, I just wanted to see what your answer would be... That would make a good sig file for this group. |
#25
|
|||
|
|||
Cobra 25LTD Classic tune up
On Fri, 24 Feb 2006 18:45:59 GMT, Lancer wrote:
+Yes, really now...Jay has never had a mean thing to say to anyone in +this group. I took exception at your condisending attitude to him. ***** He proceeded to explain to me how AM worked and asked me to refer to an old ARRL handbook. Instead I referred back to my college communications textbook and quoted an equation that is the standard form to mathematically explain how AM works. Now is that is pompous or being condisending then I apologize to him. It was my intention to properly explain mathematically how AM works. Your reply to me seemed to be more of an attack. I don't try to attack but explain technicaly the best that I can. There is no intention of ill will. james |
#26
|
|||
|
|||
Cobra 25LTD Classic tune up
Frank Gilliland wrote:
This is CB radio. Get with the program. Click Click. |
#27
|
|||
|
|||
Cobra 25LTD Classic tune up
On Sat, 25 Feb 2006 02:59:08 GMT, james wrote
in : On Fri, 24 Feb 2006 18:45:59 GMT, Lancer wrote: +Yes, really now...Jay has never had a mean thing to say to anyone in +this group. I took exception at your condisending attitude to him. ***** He proceeded to explain to me how AM worked and asked me to refer to an old ARRL handbook. Sifting back through the thread it appears that you began this disagreement with an obtuse remark. To wit: 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 Like, where did -that- come from? It sounds like you misconstrued his remarks in your zeal to spout off something you read in an old text book that you picked up at a flea market. Well, read the book again but begin with the first chapter, which will usually state that Fourier analysis is only a mathematical tool for advanced engineering concepts (i.e, IMD analysis) and is not normally used to explain the general principles of amplitude modulation; a comprehension of the differences between the domains of time and frequency are usually considered to be sufficient for most educational purposes. Instead I referred back to my college communications textbook and quoted an equation that is the standard form to mathematically explain how AM works. Well, your 'education' is lacking since the formula you provided is only the basic groundwork for Fourier analysis; the analysis of non-linear mixing of any two signals requires a function (or several fuctions if there are more than two signals or if the signals are non-sine) requiring an iterative progression in order to integrate the distortion products. But I don't see how -any- of that matters when all Jay was talking about was boosting the audio in order to fully modulate a bigger carrier on a CB radio..... Now is that is pompous or being condisending then I apologize to him. It was my intention to properly explain mathematically how AM works. Your reply to me seemed to be more of an attack. I don't try to attack but explain technicaly the best that I can. It wasn't needed, nor was it requested. There is no intention of ill will. You were trying to toot your own technical horn. This is CB radio. Get with the program. ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#28
|
|||
|
|||
Cobra 25LTD Classic tune up
james wrote:
On Fri, 24 Feb 2006 18:45:59 GMT, Lancer wrote: +Yes, really now...Jay has never had a mean thing to say to anyone in +this group. I took exception at your condisending attitude to him. ***** He proceeded to explain to me how AM worked and asked me to refer to an old ARRL handbook. Instead I referred back to my college communications textbook and quoted an equation that is the standard form to mathematically explain how AM works. Yeah, thanks for posting the formulas, now everyone in the group understands how AM works.. Now is that is pompous or being condisending then I apologize to him. It was my intention to properly explain mathematically how AM works. Your reply to me seemed to be more of an attack. I don't try to attack but explain technicaly the best that I can. There is no intention of ill will. james If you think my reply was an attack...LOL!! |
#29
|
|||
|
|||
Cobra 25LTD Classic tune up
Hello Scott:
I think we are getting the Time Domain mixed up with the Frequency Domain. My comment was on a Oscilloscope voltage measurements which are in the time domain. Without the RF Carrier voltage being modulated, increasing and decreasing you would not have modulation of course. I never said the power in the carrier changes. Or maybe I said it poorly?!??!?!? But by added in more modulation power, like I said will allow for the finial rf amplifier to have more modulation power, allowing for more RF Carrier to be fully modulated, if it can handle the extra power. Simple stuff. More power and modulation kicking a high drive amp will cook! I have seen where the radios have been somehow modified to allow unlinear modulation, that is the upper and lower envelopes are not identical, and the radios still sounds ok. Yeah I don't know what they do for the swing mods?!??!!?! I put in Amplitude Modulation Envelope into Goggle and got a bunch of neat web sites on the subject. Jay in the Great Mojave Desert, ....just down the road ah ways from the fillin station. Scott in Baltimore wrote: ****** 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) |
#30
|
|||
|
|||
Cobra 25LTD Classic tune up
On Fri, 24 Feb 2006 19:49:53 -0800, Frank Gilliland
wrote: + +Sifting back through the thread it appears that you began this +disagreement with an obtuse remark. To wit: **** In my opinion I do not feel that any of my remarks were out of line or harsh. Like I said, if they did seem that way they were not intended to be so. james |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
FS: Cobra 29 LTD Classic (parts radio) $12.00 | CB | |||
Cobra 25LTD Classic | CB | |||
Cobra 25 LTD classic vs 29 LTD classic | CB | |||
Cobra Classic 29 Ltd, anyone have one? | CB | |||
Cobra 25 WX LTD Classic mic squeal | CB |