Copper Talk » Ask The Tech » General CB, Ham & Mur's Radio Related Questions/Topics » Asymmetrical Limiting « Previous Next »

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Kc8gpd
New member
Username: Kc8gpd

Post Number: 8
Registered: 2-2004
Posted on Sunday, January 14, 2007 - 11:51 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
has anyone tried using asymmetrical limiting on the cb band??

We use this on AM Broadcast to modulate the AM Carrier to -99% and +120% this helps make the staton get out further and sound louder.

I was not sure if CB's have been designed to prevent this as i know the FCC has mandated all sorts of technical junk on Type accepted CB Radios.

Also some sort of AGC/Leveler befor the Asymmetrical Final Limiter would keep the audio at a constant level.

Note: Asymmetrical limiting only works in AM mode and does not work on FM or SSB.
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Tech833
Moderator
Username: Tech833

Post Number: 1592
Registered: 8-2002
Posted on Sunday, January 14, 2007 - 12:20 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
It has been going on with the CB crowd for a long time. Do a search for 'NPC modification'.

BTW, asymmetrical modulation works great for shortwave too!

FCC limits on positive peak for AM BCB is 125%. But, I remember discussing with older engineers the days when there were no limits and stations would go 200% or more when possible. That was before Bob Orban ever built an AM audio processor. The hottest thing available was the CBS labs Audimax.

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