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Anyone know if clipping d129 on a HR 2510 will open up the am limiter

dxhound said:
So lets see...... what happens at 101%

Oh I know, clipping /flat topping of the signal AND NOT the kind of clipping used in a quality speech processor where you can alter the % of amplitude on the negative or positive portion of the inteligence signal


Start here http://www.privateline.com/PCS/Weisman.pdf

Then make comments :)
Click to expand...

You obviously have a rather limited understanding of Amplitude Modulation, and I'm not here to educate you....
 
Your absolutely right, I have no idea what Amplitude modulation, Filter Skirt modulation, Swept Side Wave, Single Sideband, Double sideband, Filter skirt carrier, triangle swept wave are, etc... etc... I could go on and on. \

But hey I only repair, modify, and help design Radar jamers and tow decoys for the United States Airforce....

I can see it now, The book has one page with one instruction
#1 Clip limiter to let her swang, Crank EVERYTHING wide open, then go further
 
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Proof why the gov is the way it is...

101% modulation DOES NOT EQUAL FLAT TOPPING!

You even know what causes flat topping?

.... (y)


dxhound said:
Your absolutely right, I have no idea what Amplitude modulation, Filter Skirt modulation, Swept Side Wave, Single Sideband, Double sideband, Filter skirt carrier, triangle swept wave are, etc... etc... I could go on and on. \

But hey I only repair, modify, and help design Radar jamers and tow decoys for the United States Airforce.....

I can see it now, The book has one page with one instruction
#1 Clip limiter to let her swang, Crank EVERYTHING wide open, then go further
Click to expand...
 
packrat said:
Not to stir the pot, but you can never have more than 100% of anything. Period. Any more than 100% of anything is 2 of something.

PR
:pop:
Click to expand...

Here is a good that explains AM in pretty good laymens terms. The funny thing is, this what written by engineers and never once do they state anything above 100%. They even mention flat topping toward the bottom(and because fatty wont read the whole thing, Ill copy and paste.....


"I am sure many other hams were/are also unaware, and just assumed that if you hit 100% on negative peaks you automatically hit 100% on positive peaks as well, with voice modulation as well as a sine wave tone. So I could have been running my audio either way. I'm sure many cases of unexplained splatter result from the high positive peaks trying to drive a transmitter capable of modulating only 100% positive, resulting in flat-topping, which causes about as much splatter as negative over-modulation. So two hams could each have a KW transmitter modulated 100% as indicated by a negative peak flasher, and one transmitter be will within the limit, while the other kicked the peak meter off scale, and lacking knowledge of the asymmetry factor, be completely baffled to explain why."
 
First off, Asymetry, postive and negative peaks, are what I was referring to all the time, your the one who popped in and simply made two statements that ARE NOT true, or applicable under ALL conditions.


dxhound said:
Here is a good that explains AM in pretty good laymens terms. The funny thing is, this what written by engineers and never once do they state anything above 100%. They even mention flat topping toward the bottom(and because fatty wont read the whole thing, Ill copy and paste.....


"I am sure many other hams were/are also unaware, and just assumed that if you hit 100% on negative peaks you automatically hit 100% on positive peaks as well, with voice modulation as well as a sine wave tone. So I could have been running my audio either way. I'm sure many cases of unexplained splatter result from the high positive peaks trying to drive a transmitter capable of modulating only 100% positive, resulting in flat-topping, which causes about as much splatter as negative over-modulation. So two hams could each have a KW transmitter modulated 100% as indicated by a negative peak flasher, and one transmitter be will within the limit, while the other kicked the peak meter off scale, and lacking knowledge of the asymmetry factor, be completely baffled to explain why."
Click to expand...
 
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AS Moleculo pointed out, keep to the point and don't inflame each other. A reasonable debate is greater without the attacks.
And yes; I did edit the content of some posts in order to keep the debate intact and cutting out the lol's and what not.
Other than that, go on debating - just stick to the facts please...
 
Wow, the content kinda got butchered on those edits.....:oops:


Looks like a good time to step out of this one...

DXhound, I've read all those same links you've posted, before you posted them, I don't base my posts on a view in a narrow little world.... Fact is you can most certainly have over 100% modulation, and be within allowable FCC specifications, as well as sound good, AM broadcast does so on a daily basis.

My whole presence in this thread is regarding general statements that are made, or simply parroted on the internet, I neither advocate removal of a limiter circuit, nor condemn, it all depends upon way to many other factors. In a general sense when you have an average CB'er who clips the limiters out of circuit, then yes, typically its just a mess..

But there is more to it then modulation over 100% the difference is knowing it, and just preaching your opinion.
 
WOW

Hello all,

Interesting thread..

If you clip D129 you will disable the AMC Limiter.
The AM limit transistor will no longer function as designed.

I have that mod posted on my 2510 site, because it was a common modification to disable the AM limiter(it was suggested to me to include it on my site)

I suggest in the 2510, the AM Mic Gain mod :
micgain
that adds a resistor to the transistor leg, increasing the limited AMC control to function closer to 100% adjustment. (typical 2510 circuitry limits the AMC to 70 - 75% modulation MAX.)

So this resistor mod moves the adjustment limit to closer to 100%.

It doesn't necessarily increase audio, it doesnt clamp it to a max of 70%.
Meaning after the mod, if you add a power mic, the AMC can be adjusted to allow more Modulation.

To go on record.. I dont recommend removing AMC Limiters. It can cause splatter, and undesirable results.

If your interested see this link, detailing audio, clipping and such:
Amplitude Modulation

Roger
 
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