[time-nuts] WWV/CHU

[Bob kb8tq]

Hi

If you are running 10 MHz as your lab standard, you *will* have 10 MHz floating around. 
Add to that various 10 MHz OCXO’s here or there on the bench and you have even more
odd stuff right at 10 MHz. Yes, if you run triple shield coax for your standard lines and your
antenna is 1000’ from your lab, this may not be that big an issue. If you setup is a bit more
modest, as WWV fades, the local stuff will be apparent. Bottom line - consider 5 MHz  (
unless you are set up with that as your standard ….).

Bob

> On Mar 29, 2018, at 6:58 AM, Tim Shoppa <tshoppa at gmail.com> wrote:
> 
> It does not take a fancy receiver to hear WWV or CHU. Any super low end shortwave portable (less than $100) will do fine.
> 
> You then feed the audio into a PC with naps configured for NTP audio refclock.
> 
> The wideband USB connected DSP receivers are neat and I am using one for various purposes in the shack but not yet WWV. You would have to characterize one and it’s computer based DSP processing for latency.
> 
> Any such setup has to be characterized for latency (propagation + receiver+ soundcard) anyway. Sub-millisecond accuracy is a reasonable goal.
> 
> In continental US, one or more of the three 5/10/15 MHz WWV signals is receivable most any time of day. NTP WWV software knows how to cycle one particular model of receiver through the frequencies and can easily be modified to work with other computer-controllable receivers.
> 
> WWVH can be reliably heard for some of each day as well.
> 
> A recent QST or QEX had a nice simple 10MHz WWV receiver in it. I think it was oriented towards extracting 10MHz carrier and not for demodulating the time code, however.
> 
> Tim N3QE
> 
>> On Mar 29, 2018, at 6:12 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
>> 
>> 
>> What do I need in in order to get time from WWV or CHU?
>> 
>> Do I need a fancy receiver as a front end?  Do I have a chance with one of 
>> the low cost USB thumb drive size receivers?
>> 
>> Is there an obvious software package to start with?  (Linux)
>> 
>> 
>> -- 
>> These are my opinions.  I hate spam.
>> 
>> 
>> 
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