[time-nuts] WWVB Response

J. Forster jfor at quikus.com
Thu Sep 27 14:15:41 UTC 2012


Probably so.

Which leaves two alternatives:

Build a receiver anyway. XW will likely wait unitl it starts making
money...  then sue. A typical strategy.

or

Try to get a license and pay through the nose.

Once again, we see the government picking winners and losers. How has that
worked out for the taxpayers lately?

-John

==================


> The more likely problem is the "designer" of the new
> modulation has written patents that sew up every way
> they can think of to demodulate the signal.  If they
> did a good job with the patent, you won't be able to
> design a receiver that demodulate the signal without
> patent infringement.
>
> -Chuck Harris
>
> Peter Monta wrote:
>> 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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