The AM characteristics have not changed. That means that there is at least
10% carrier present at all times.
The transmission format seems pretty well documented. The remaining
mysteries are in data formatting.
Regards,
Dale NV8U
-----Original Message-----
From: Peter Monta
Sent: Thursday, September 27, 2012 1:52 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] WWVB Response
Hi John,
Thank you for clarifying the openness of the transmission format.
Could I ask whether there is any scenario under which aspects of the
signal transmission design might be patented? If companies or
individuals wish to patent aspects of receiver design, that's fine,
but I'd be uncomfortable with a patent-encumbered transmission format.
... It is an unfortunate consequence of improving the reception
capability of our broadcast that this segment of our loyal user base are
so
adversely affected. The decision to proceed was not taken lightly, but in
the end it was decided that the improvement in reception capability
(especially along the JJY interference prone East Coast) outweighed the
loss
of use of existing PLL devices.
I suppose it's a matter of balancing the value of the PLL receivers
and the loss of BPSK signal power to the residual carrier. If the
power loss is small, though, say 0.5 dB or below, then given the large
process gains of the advanced receivers, it might be worth
considering. I don't imagine that the mere presence of residual
carrier has any effect on the advanced receivers (since it is similar
to interference from MSF and JJY, as you say), but please correct me
if I'm wrong.
Cheers,
Peter
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