[time-nuts] Nutty time-nuttery with WWVB

Van Horn, David david.vanhorn at backcountryaccess.com
Thu Nov 10 12:51:00 EST 2016

Enforcement.. It would be nice.

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Alex Pummer
Sent: Thursday, November 10, 2016 10:39 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Nutty time-nuttery with WWVB

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?


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
> 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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