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Hi Jim. Any interest in attending the rrcb bonanza next year?
-YOU- gotta be there we're, counting on ya! g (Jim Hampton) wrote: Hello, Twist Dave was referring to 'S' units at the other end of the circuit. One 'S' unit is *supposidly* equal to 6 dB. 6 dB is an increase in power of four times. |
itoldyouiamnotiamnotgeorge wrote:
Steveo wrote in news:20041006190307.240 : Hi Jim. Any interest in attending the rrcb bonanza next year? -YOU- gotta be there we're, counting on ya! g Will you have men in draG there for markie beck How do you look in a too too? |
On Wed, 06 Oct 2004 21:26:31 GMT, "Marty B."
wrote in : YOU GUESS ARE SO SMART, WHAT THE **** YOU DOING ON CB ? Sorry, I didn't know CB was reserved for illiterate morons. |
"Steveo" wrote in message ... itoldyouiamnotiamnotgeorge wrote: Steveo wrote in news:20041006190307.240 : Hi Jim. Any interest in attending the rrcb bonanza next year? -YOU- gotta be there we're, counting on ya! g Will you have men in draG there for markie beck How do you look in a too too? Who cares! I say invite him, see if he spouts his crap to our faces, he won't......... LMAO!!! Landshark -- The world is good-natured to people who are good natured. |
"Landshark" wrote:
"Steveo" wrote in message ... itoldyouiamnotiamnotgeorge wrote: Steveo wrote in news:20041006190307.240 : Hi Jim. Any interest in attending the rrcb bonanza next year? -YOU- gotta be there we're, counting on ya! g Will you have men in draG there for markie beck How do you look in a too too? Who cares! I say invite him, see if he spouts his crap to our faces, he won't......... LMAO!!! Landshark He's invited! This wing ding is open to anyone that posts here. -- F the CC - Steve Earle |
notiamnotgeorge wrote:
Steveo wrote in news:20041006195103.820 : itoldyouiamnotiamnotgeorge wrote: Steveo wrote in news:20041006190307.240 : Hi Jim. Any interest in attending the rrcb bonanza next year? -YOU- gotta be there we're, counting on ya! g Will you have men in draG there for markie beck How do you look in a too too? wouldnt you like to know Big Boy ... LOL Is that the only way I get invited to the party?? Nope, and please don't dress that way if you can help it. :) You are assured safe passage and are welcomed as long as you're not there to start trouble. You'd have fun. -- F the CC - Steve Earle |
On Wed, 06 Oct 2004 11:47:29 -0700, Frank Gilliland
wrote: On Wed, 06 Oct 2004 07:19:53 -0400, Dave Hall wrote in : snip Geeze! Why don't you tell him what you REALLY think. ;-) Actually the term "compression" refers to the condition where a normally linear device, starts to lose that linearity. If the gain of your amp is 10 db, then 5 watts in should give 50 watts out. 10 watts in should give 100 watts out. If 15 watts in only results in 120 watts out, you are now "in compression". You call that clipping, but compression is also a valid term for this condition. We use this term all the time where I work. Granted the amps I work with are not as powerful, they are still governed by the same characteristics. Usually once "compression" is reached the incidents of second order harmonic generation increases disproportionately with the output, usually at a 2:1 ratio. Let's try and clarify a few terms here..... Clipping -- distortion that occurs on the top of a waveform due to the signal exceeding the limitations of the circuit. No argument. Limiting -- the result of intentionally preventing a signal from exceeding a given level. This can be done by clipping, automatic gain control, or both. Also correct. Compression -- a term usually applied to audio conditioning where the amplification of a signal is varied inversely to it's input level. One of the most common types of audio compressor is called "constant volume amplifier". That is but one type of compression. For a more detailed discussion of RF amplifier compression, please refer to the following related link: http://cp.literature.agilent.com/lit...5965-7710E.pdf Generally speaking, amplifier compression occurs when the input:output power ratio no longer increases db for db. But the problem here is that the term 'compression' has been adopted by voodoo techs as a euphamism for 'clipping', making it sound as if the distortion-causing effect is not only benign, but sometimes preferred. It is neither. After reading the link, you might want to revise your definition. There are a bunch of very talented engineers here who would be a bit insulted to find out that you refer to them as "voodoo techs". But you are right about one thing. a -33dbc harmonic rating from a single carrier signal is pretty poor. Perhaps a chebychev lowpass filter on the output will fix it up..... That would be nothing more than a kludge. The fault is in the design. The response isn't even close to linear. That may be due to the bias class, the bias regulator, the choice of active device, or just crappy engineering overall. I suspect it's a little of everything. Usually, if it is a push-pull design, device matching plays an important part. Bias is also important, as is impedance matching. But even a "good" design should have a follow-up low pass filter to minimize any harmonic content. Dave "Sandbagger" http://home.ptd.net/~n3cvj |
On Wed, 06 Oct 2004 21:26:31 GMT, "Marty B."
wrote: YOU GUESS ARE SO SMART, WHAT THE **** YOU DOING ON CB ? So in other words, only dummies should use CB? I'm sure there are a few people who would take offense to (and some who would resemble) that comment. Dave "Sandbagger" http://home.ptd.net/~n3cvj |
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