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Discussion in 'General CB Services Discussion' started by 15minigrass, Feb 24, 2012.
Just some thoughts I had!! 1-5.
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My understanding is that Class C amps work ok on am but not on SSb.
And about the original question, I have been told otherwise . . . That is, that the output sounds clean in such an arrangement. But hearing is so subjective and selective. Just ask my wife.
The term 'Linear' cannot be applied to a class C biased amplifier.
Set to Class C, an amplifier will never amplify making the output signal a clean 'linear' copy of the input signal on SSB and likely not very well on AM.
For linear opertion, the bias has to be somewhere between class A, AB1, AB2, not B or C.
On FM or CW it does not apply for different reasons.
It's the lack of theory and understanding what these bias setting mean is why the question keeps coming up.
They work on AM and you can add a delay and even run them on SSB, depends on how you define "works". A class C box will "work" on SSB but it will sound crunchy and harsh. Ok for the part time sidebander.
They do work on AM and continue to sell, that's why Davemade, X-Force, and fatboy stay in business just to name 3 builders. One reason for this is they are illegal and un-regulated, so people that want more power buy what they can get.
The post above pretty much says it all though. Class C is not linear, and was not intended for AM or SSB use.
you put a dirty
signal in,you get a very dirty signal out.Get a good amp and a clean radio you dont have a problem.73 de JW
Bobbing for Apples - YouTube
So your completely ignoring the fact that the non linear operation, and splattering harmonics bleeding into other frequencies, among many other problems, and while ignoring this, you feel it cant be heard? a 60 cent speaker can hear this. Bias is there for a reason, or linear operation, among other factors, i suppose, seeing as most people feel filtering isn't necessary either, and robs watts from their meter, why bias the thing anyway.
Thats the same set of people that feel a single 2879 can produce 200 bird watts.
How do you think the PA transistors in your radio are biased? If you understand that taking clean RF from a clean radio and inputting it into an improperly design amp will result in a dirty signal, why would it make any difference if you inserted an additional PA stage in the middle?
I can hear it on a $0.99 speaker if that amplifier is putting out a ridiculous amount of harmonics on a band that I happened to be tuned to...which is where the problem is. Avistar23 nailed this one. I have experienced this and it's really easy to reproduce / demonstrate the problem.
Additionally, what equipment is it detectable on if on the same frequency?
I am assuming equipment sufficient to hear it is Amateur transceivers, correct?
Serious questions, not arguments.