[time-nuts] HP 117/10509a...

[Bob Camp]

Hi

The real question is weather the BPSK will help us get significantly better accuracy out of WWVB or not. If it does, time marches on. If not - total waste of effort. 

DSP based low frequency receivers are pretty easy to make. You still will need those antennas and preamps to make them work though. If I can get Loran-C type accuracy out of WWVB with the new modulation, I'll certainly build or buy a receiver. 

Bob

On Jul 5, 2012, at 5:43 PM, J. Forster wrote:

>> Hi:
>> This is so frustrating!
> 
> Agreed.
> 
>> Who makes cheap clocks? CHINA.
>> 
>> Who uses phase comparison? DOD, American Colleges and Universities,
>> Laboratories, Astronomers, American Private Industry, Time Nuts, ETC.
> 
> Not really. They have all drunk the GPS Kool-Aid.
> 
> To allow a second source for a standard of time interval, carries the
> implication that GPS is not invulnerable. If that's true, people may
> wonder what else needs a backup, like navigation? Electric grid
> synchronization? Phones?
> 
>> What is our government doing?
> 
> One man, one vote, (one time?). There are a lot more cheap Chinese
> 'Atomic' clocks sold every day than timing receivers sold in a year.
> Numbers count.
> 
>> They appear to be the best friend Chinese manufacturers ever had!
> 
> Certainly true, in The Donald's view. The US government plays checkers,
> the Chinese and Japanese play Chess...  to steal an analogy.
> 
> US companies, driven by Wall Street quarter-over-quarter greed, think
> about the next quarter; Asian companies think about the next few decades.
> 
> The switch to HDTV was supposed to be a giant stimulus for the US
> electronics industry, hence a US 'standard'. How did that work out? What
> fraction of HDTVs are US made?
> 
> YMMV,
> 
> -John
> 
> ==============
> 
>> 
>> Ron
>> 
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of J. Forster
>> Sent: Thursday, July 05, 2012 10:29 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] HP 117/10509a...
>> 
>> The only ones that will work are very recent designs.
>> 
>> The HP 117 and Fluke 207 will not work.
>> Many Spectracoms will not work. A few will. See their web site
>> The Stanford 620 will not, I believe. Some models may.
>> 
>> I posted a partial list some time ago.
>> 
>> Apparently, NIST is working on a receiver and possibly a retrofit. When
>> it
>> will be available and how much it will cost is TBD.
>> 
>> I suspect the 'retrofit' will be the receiver with a 60 kHz output
>> added,
>> nothing more, but don't know.
>> 
>> Seems to me, we are down to one egg in one basket.  :((
>> 
>> -John
>> 
>> ================
>> 
>> 
>> 
>>> Dear Group,
>>> 
>>> This thread just saved me from a prospective purchase of an HP 117.
>>> 
>>> Now the big question. Which instruments in general will be affected by
>>> the BPSK transition? I have been reading about Kinemetrics 60DC WWVB
>>> receiver and clock. It appeals to me if I find one. Will other WWVB
>>> instruments not designed specifically for phase comparisons be
>>> affected for the WWVB signal modulation changes? Which kind of
>>> instruments and interactions with WWVB should I avoid?
>>> 
>>> Thank you. Your comments are surely welcome.
>>> 
>>> Regards,
>>> 
>>> 
>>> Edgardo Molina
>>> Dirección IPTEL
>>> 
>>> www.iptel.net.mx
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.