[time-nuts] Nutty time-nuttery with WWVB

Alex Pummer alex at pcscons.com
Thu Nov 10 12:39:29 EST 2016


And how about that many, many "radiator" which are moving up and down 
with their carriers and don't give a damn about FCC Part 15 and 
radiating radiating day and night with substantial power, I meant that 
FFC approved and not approved switching mode power supplies, of which 
every household has a hand full of it?

73
KJ6UHN
Alex

On 11/10/2016 9:22 AM, William H. Fite wrote:
> I heartily second Charles' admonition regarding FCC PART 15 unlicensed
> transmissions. Part 15 explicitly states that an unlicensed operator may
> not cause interference with any licensed transmission. Because of the
> specific purpose of WWV/WWVB transmissions, any discernible leakage
> detectable by any other user is prima facie evidence of unlawful
> transmission and subject to a heavy fine. I assure you that any licensed
> Part 97 user who detects your emissions over the top of WWVB is quite
> likely to rat you out to Uncle Charlie. And should, may I say, because you
> will be interfering with a public service. "I am just syncing my clocks" is
> not going to impress the guys who appear in your driveway in a white van
> with RDF antennas on the roof.
>
> So....be very damned sure that you are not radiating a discernible signal
> outside of the immediate vicinity of your clocks.
>
> Bill
> KJ4SLP
>
>
>
> On Thursday, November 10, 2016, Charles Steinmetz <csteinmetz at yandex.com>
> wrote:
>
>> Peter wrote:
>>
>> Could I implement my own personal WWVB transmitter that would
>>> be powerful enough to be picked up by the clocks in my house?
>>>       *   *   *
>>> Has anyone tried this?
>>>
>> Some on the list have, and I'm sure they will provide the details.
>>
>> Others have mentioned the potential problems with interference to other
>> WWVB users.  For starters, make sure you study and understand Part 15 of
>> the FCC rules before you put it on the air, or you could face a nasty
>> enforcement action.  (Even if you are Part 15-compliant, you may still
>> screw up other users' reception and get a visit from the FCC when they
>> complain.  I operate several very sensitive 60kHz receivers -- if you live
>> in my neighborhood, I'm almost certain to be unhappy about anything you
>> deploy.)
>>
>> Note that the problem with most "atomic" clocks that I've seen is actually
>> not insufficient signal (in the wee hours of the morning, when they try to
>> synch).  It is either excessive QRM, or orienting the clock so its antenna
>> has a null toward Fort Collins.  Make sure the antenna has a major lobe
>> toward Fort Collins (this may require relocating the entire clock or
>> bringing the antenna out so you can orient it independently), and that it
>> is well clear of the AC mains distribution wiring in your house and any
>> other sources of QRM (wall warts, CFL lamps, LED lamps, etc. (this may also
>> require relocating the clock).
>>
>> The typical clock using a loopstick antenna has lobes to the front and
>> rear, and nulls to the sides.  Thus, mounting the clock on the western
>> exterior wall (for users on the east coast) is usually best.  Putting it
>> directly in front of a west-facing window may help.
>>
>> Best regards,
>>
>> Charles
>>
>>
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