From: MarkusVester@aol.com
Message-ID: <8d.4763591.27f50ca5@aol.com>
Date: Thu, 29 Mar 2001 17:09:41 EST
Subject: Re: LF: <Tech> BPSK PLL, wheels
To: rsgb_lf_group@blacksheep.org
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Hi Rik, Jim, Rye and all,

>  The error between input and 
>  output phases could be corrected either by increasing the VCO 
>  frequency until the output phase "catches up" with the input, or 
>  decreasing it until it "slows down" to match the input. The output 
>  phase could shift in either direction, although the end result would 
>  always be to match the input phase.

Like in real life, it's sometimes a sad thing to have to decide one way or 
another. If that PLL could take both routes simultaneously, the result would 
be perfect soft BPSK again :-) . In the 30's, there was a scheme called 
"Chireix modulation" which added the power outputs of two phase-modulated 
class-C transmitters to achieve AM in an efficient way.

> I am working on this round thing that can be used to reduce friction rather
> than simply dragging things across the ground.....

Me too, apparently... I hardly dare say it in public, but in my opinion, 
re-inventing basic stuff is not so stupid at all. Don't we learn a lot more 
by own thinking and fiddling than by just believing in the solutions the 
experts have come up with for us? Trying to catch a glimpse of tiny dots 
encircling Jupiter in a homemade cardbord-roll telescope may be more exciting 
and instructive than a great show of colourful deep-sky HST images on the 
web. Which of course is not bad, either...

73 de Markus, DF6NM