Clean Signals from C Class!!!

[Beetle]

Take some really wet, sticky, gooey mud and throw it against a wall. What you see is splatter. Splatter doesn't really refer to harmonic frequencies; more like nearby frequencies that wouldn't be affected at all by a clean signal. If you're listening, say, on channel 19 and you hear voice peaks and other stuff being transmitted by a splatterbox that's supposedly on channel 3 ... THAT'S splatter.

It wouldn't surprise me if you COULD hear it on the second (and third...etc) harmonic of channel 3, but harmonics and splatter/spurious signals are not the same thing.

Check a transmitter's output with a spectrum analyzer. That's the referee.

 

[Captain Kilowatt]

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.

 

[avistar23]

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.

 

[Moleculo]

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.

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.

 

[mackmobile43]

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.

 

[avistar23]

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.

 

[mackmobile43]

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.

 

[bob85]

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.

 

[mackmobile43]

BAW HAW HAW, it's so true.

 

[IDIeselman]

,
you could hear the class C switching distortion through a $6 speaker if you owned a $40 deaf-aid,

Your reading comprehension skills are matched only by your ability to swing from the nuts of those before you!

The question-

If you run a clean un-modded/clean radio thru an AB amplifier to a C class splatter box, will the signal still sound splattered coming out of the C class amp?

The answer is no! Not discernable to the ear. No question of spurious emissions or if the signal would "splatter" across other bands. When you order those Bifocals, you mant also want to upgrade to the super ear 5000, You are hearing shit that is just not there.^^ ab v c^^

 

[mackmobile43]

,
you could hear the class C switching distortion through a $6 speaker if you owned a $40 deaf-aid,

Your reading comprehension skills are matched only by your ability to swing from the nuts of those before you!

The question-

The answer is no! Not discernable to the ear. No question of spurious emissions or if the signal would "splatter" across other bands. When you order those Bifocals, you mant also want to upgrade to the super ear 5000, You are hearing shit that is just not there.^^ ab v c^^

This comes from someone who's obviously hasn't mastered the forum quote function.

Every word bob said is based in and backed up by accepted RF theory and practices.

Don't show your intelligence any further please.

 

[mackmobile43]

,
you could hear the class C switching distortion through a $6 speaker if you owned a $40 deaf-aid,

Your reading comprehension skills are matched only by your ability to swing from the nuts of those before you!

The question-

The answer is no! Not discernable to the ear. No question of spurious emissions or if the signal would "splatter" across other bands. When you order those Bifocals, you mant also want to upgrade to the super ear 5000, You are hearing shit that is just not there.^^ ab v c^^

Care to change your last statement after you listen to this?

Refer back to this discussion.
http://www.worldwidedx.com/general-cb-services-discussion/34432-ab1-amplifier-class-c-amplifier-sideband-comparison.html

ab bias check 11 - YouTube!

 

[bob85]

If you run a clean un-modded/clean radio thru an AB amplifier to a C class splatter box, will the signal still sound splattered coming out of the C class amp?

Just some thoughts I had!! 1-5.

15minigrass,
the watergate demonstrates what class C does to ssb audio regardless of where the class C amp is in the chain,
pay no attention to billybullshit,

thanks mack

 

[mackmobile43]

15minigrass,
the watergate demonstrates what class C does to ssb audio regardless of where the class C amp is in the chain,
pay no attention to billybullshit,

thanks mack

anytime pal

 

[Captain Kilowatt]

Care to change your last statement after you listen to this?

Refer back to this discussion.
http://www.worldwidedx.com/general-...er-class-c-amplifier-sideband-comparison.html

ab bias check 11 - YouTube!

Good comparision. It CLEARLY shows the difference between class C and class ab. The class C sounds pinched and distortion is plainly present.