wireless router what at 2.4ghz!!

try killing the power to your house while running the RX'er from a battery
or car.
that should give you agood idea if its you or not

mike

"DougSlug" wrote in message
...
"Ron Baker, Pluralitas!" wrote in message
...

"Edmund H. Ramm" wrote in message
...
In "Ron Baker,
Pluralitas!"
writes:


"DougSlug" wrote in message
...
While tuning through the 28.3 to 28.5 MHz portion of the 10m band in
USB
mode, I get what sound like carrier tones very evenly spaced every 15
kHz
starting at about 28.3 MHz.

I am using an AOR AR8600MkII receiver with an AOR SA7000 antenna
mounted
on a mast outside. I am located in central NJ in the
Princeton/Trenton
area.

What is the source of these tones?

Thanks,
Doug

The horizontal sweep of television sets is 15750 Hz.
Switch mode power supplies operate anywhere from
10 kHz to 100 kHz.
It is not uncommon for either of them to ring and generate
harmonics in HF.

In the case of switch mode power supplies the spikes IMO would be
120Hz apart (100Hz where I live). And most of the rf energy is spilled
from abt. 1 to 7 MHz, with almost nothing left to be found on 28MHz.

73, Eddi ._._.
--
e-mail: dk3uz AT darc DOT de | AMPRNET:
If replying to a Usenet article, please use above e-mail address.
Linux/m68k, the best U**x ever to hit an Atari!


The mains frequency has little to do with the noise
that a switcher can generate. A switcher rectifies and filters
the mains to DC then uses a switching transistor to
drive a transformer at a much higher frequency. Tens of
kHz typically. The higher frequency allows the "magnetics",
i.e. the tranformer, to be much smaller physically than
a 60 (50) Hz transformer. That plus the on-off and not
linear nature of the switch allows switching power supplies
to be smaller and more efficient than linear supplies.
It is the switching, with sharp edges, that generates
high frequency components. I've seen poorly designed
switchers generate harmonics into the hundreds of MHz.


--
rb

I understand about the noise and harmonics a switcher can generate, but
the thing is that my antenna is mounted outside on a mast 25 feet up. All
the wiring in my neighborhood is underground. It's not clear to me how I
could be getting such strong interference in this case. What about
harmonics from wireless routers? Could that explain this interference
pattern? - Doug