Well, there is such zoo, that nobody could find what coming from where,
I tried with an R&S EMI receiver and antennas, but on the other hand one
could use the high level of energy to supply the power for small
circuits....
73
KJ6UHN
Alex
On 11/10/2016 10:15 AM, Clint Jay wrote:
Don't forget power line networking equipment but just because one
interference source is tolerated or in order by the authorities doesn't
mean it's ok to create another.
Those switchers and even the hardware they power (I'm thinking of satellite
receivers which spew all sorts of hash over HF bands) are terrible sources
of unmonitored QRM.
On 10 Nov 2016 17:46, "Alex Pummer" <[email protected]> wrote:
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 <[email protected]>
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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