[time-nuts] WWVB format change in 2012

[Sanjeev Gupta]

Hi,

I am reviewing and expanding and for the NTPSec project <
http://www.ntpsec.org >, a fork of NTP.

Among NTPSec's goals are a smaller, auditable, code-base; hence support for
receivers last available in the early-1990s is being removed.

I have been on this list for some years (thank you), but as I am in
Singapore, I did not pay attention to the WWVB format change.  I understand
that as a result of the change, precision equipment may not be able to
recover a usable signal from the new modulation scheme, rendering it
useless for the sub-100 microsec disciplining.

However, I am not clear if WWV and WWVH are still usable by commercially
available equipment, or of such equipment is also obsolete now.

I have read Wikipedia, the NIST pages, etc, and am still confused.  Could
someone summarise current state:


   1. Are there commercially (or widely-used) receivers for professional
   use which listen to the WWVB signal?
   2. Are there commercially (or widely-used) receivers for professional
   use which listen to the WWV(H) signal?

A supplementary question: If you have your own homebrew for these signals,
do you use them as a refclock for NTP?

Thank you


-- 
Sanjeev Gupta
+65 98551208     http://www.linkedin.com/in/ghane