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Clean Signals from C Class!!!

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  #17  
Old 02-25-2012, 02:23 AM
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There is a huge difference between working and being clean.I have heard many people say class C is fine for AM and not SSB because the carrier keeps the transistors turned on. BS an AM signal will splatter bad with a class C amp. The problem is that people do not have to listen to their own garbage across the band and therefore think it is OK. Trust me, if class C was fine for AM all the broadcasters would be using it and saving thousands on their power bills. I have often wondered if this is because they heard that broadcasters use class C in their tube type AM transmitters. The difference is that the class C amplifier is itself modulated rather than pass a modulated signal thru it.
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Old 02-25-2012, 05:10 AM
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Originally Posted by Captain Kilowatt View Post
There is a huge difference between working and being clean.I have heard many people say class C is fine for AM and not SSB because the carrier keeps the transistors turned on. BS an AM signal will splatter bad with a class C amp. The problem is that people do not have to listen to their own garbage across the band and therefore think it is OK. Trust me, if class C was fine for AM all the broadcasters would be using it and saving thousands on their power bills. I have often wondered if this is because they heard that broadcasters use class C in their tube type AM transmitters. The difference is that the class C amplifier is itself modulated rather than pass a modulated signal thru it.
I thought all u needed was a little delay so the t/r switching stays on between voice peaks and its also perfect for SSB Wont that keep the bias active, make it sound nice, no splatter, and so wonderfull. go around 14.150 and ask those guys.

Last edited by avistar23; 02-25-2012 at 05:25 AM.

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Old 02-25-2012, 07:59 AM
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Originally Posted by HomerBB View Post
Moleculo, are you saying that the only place it is detectable is on a harmonic frequency?
Beetle and others pretty much answered the question, but I'll try to as well using other terminology.

No, the "splatter" issue isn't necessarily about harmonic frequencies; that is more about adjacent frequency interference, although "splatter" is also a symptom of spurious emissions issues which includes both adjacent and harmonic interference.

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Additionally, what equipment is it detectable on if on the same frequency?
I am assuming equipment sufficient to hear it is Amateur transceivers, correct?
It can be detectable on almost any radio equipment. Years ago, I did a simple test where I keyed a crappy amp on my home station and then drove away listening on the 2nd and 3rd harmonic frequencies in my vehicle. It was quite enlightening how well and far away that you could hear the transmissions on several harmonic frequencies.

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Old 02-25-2012, 08:12 AM
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Originally Posted by avistar23 View Post
I thought all u needed was a little delay so the t/r switching stays on between voice peaks and its also perfect for SSB Wont that keep the bias active, make it sound nice, no splatter, and so wonderfull. go around 14.150 and ask those guys.
The delay circuit is an RF based circuit used to eliminate the need for a mechanically operated "foot pedal" relay to apply RF to the base of the transistors and has nothing to do with an active bias circuit, that is either applied full time or applied via another relay circuit because biasing applies low dc voltage to the base of the transistor thus creates heat and that can be switched on at TX via the rf switched relay.

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Old 02-25-2012, 08:24 AM
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Originally Posted by mackmobile43 View Post
The delay circuit is an RF based circuit used to eliminate the need for a mechanically operated "foot pedal" relay to apply RF to the base of the transistors and has nothing to do with an active bias circuit, that is either applied full time or applied via another relay circuit because biasing applies low dc voltage to the base of the transistor thus creates heat and that can be switched on at TX via the rf switched relay.
i was mocking the thought process that people have had in this thread, i wasn't seriously stating there was any proper bias, never the less a switchable bias, and yes i understand why they use rf activated switching and i understand why you want bias switched off during receive. i was simply referring to the cb mind set.

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Old 02-25-2012, 08:28 AM
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Originally Posted by avistar23 View Post
i was mocking the thought process that people have had in this thread, i wasn't seriously stating there was any proper bias, never the less a switchable bias, and yes i understand why they use rf activated switching and i understand why you want bias switched off during receive. i was simply referring to the cb mind set.
Then leave the comedy relief to the professionals ie me.

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Old 02-25-2012, 09:19 AM
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Originally Posted by IDIeselman View Post
Why is it that most tend to piss and moan about A, B or C bias? Reality is the components they are recieving the signal on are not near the quality it would take to discern the difference? I agree it's clearly notable on proper equipment but, listening through a $6.00 speaker you will never hear the difference.

the reality is you don't have a clue what you are talking about be it amplifiers or antennas,
you could hear the class C switching distortion through a $6 speaker if you owned a $40 deaf-aid,

we have a common theme with people who make a hobby out of disrupting threads with bs,
they can NEVER post links to respected sources or direct you to reference material to back up their nonesense.


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  #24  
Old 02-25-2012, 09:56 AM
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BAW HAW HAW, it's so true.

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