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Modulation index for ASK modulation - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


IR
Post subject: Modulation index for ASK modulation Posted: Mon Jul 10, 2006 7:44 am

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello,

Can anyone elaborate about the modulation index for ASK modulation. I tried to look for it in Google but couldn't find out a clear information.

Thank you all.

_________________
Best regards,

- IR


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fred47
Post subject: ASK modulation indexPosted: Mon Jul 10, 2006 11:43 am

General


Joined: Wed Feb 22, 2006 3:51 pm
Posts: 104
The modulation index for AM (and ASK is a subset of AM) is more often called the modulation percentage, but given as a straight number.

Some formulas:
MI = (Vmax - Vcarrier)/Vcarrier
MI = (Vmax - Vmin)/(Vmax + Vmin)

So the most common form of ASK, On-Off Keying, has an index of 1.

Good Luck!
Fred







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