It also applys to fiber optic transmissions.

The laser diod transmitters uses a design where a specific
fraction (a few %) of the output power is reflected back
to a photodiod. The measured level on this photodiod (after
smothing/integration) is then used to adjust the power to
the laser diod to keep a consistent laser output level.
Having a signal that has a known on/off ratio (as 50% in
the Manchester code case) makes it much easier to adjust
the power.

Jan-Erik.


> > Why do radio link care about the average DC of the encoded data ?
>
> It makes it easier to set the gain, and to decide where the threshold
> between a 0 and 1 is.
>
> > Does this apply to all forms of radio modulation ?

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body