Topband: New Noise
herbert.schoenbohm at gmail.com
Sun Jan 3 08:50:48 EST 2016
Bob, I had a horrendous noise which peaked at about 2mHz but covered
the band even down to the AM radio portion. The noise sounded like a
buzz saw with distinct peaks and valley across 160 meters. So I cut the
main breaker in the house (rig still works with big UPS system) a the
noise was gone. (This essentially eliminated all the devices in the ham
shack two routers and a half dozen wall warts.) Turned the breaker back
on and then started taking down individual breakers down one by one
until I found the circuit that corresponded with the noise. I found the
noise to be emitted for one of those new "Energy saver" Led lights in
one of the ceiling socket. I inspected the LED lamp and saw a small
burned spot. This one little device putting out a lot of noise was
capable of obliterating the entire band even with a substantial pick up
on a Beverage which originates 500 feet way and runs in a opposite
direction. Fortunately the problem originated at home and was thus
easier to deal with.
Herb Schoenbohm, KV4FZ
On 1/3/2016 9:06 AM, Bob Garrett wrote:
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> Approximately ten days ago, I experienced increased noise primarily on 160
> meters. After troubleshooting my HI-Z 4 square, I found that the noise was
> coming from the NW and is being introduced in to the 4 el array making it
> useless to hear weak signals. I also have a 100 meter DXE bi-directional
> beverage. The noise level on that antenna is up too but still functioning.
> My RBOG antennas remain quiet. One more interesting observation before I
> pose a few questions to the collective wisdom of this group. On 80 meters,
> the 4 square and beverage are still working FB. Since I haven't spent as
> much time on 80, I'm not sure if there has been an increase in the noise
> floor on that band however, they certainly don't have the increased noise
> I'm seeing on Topband.
> Yes, I have checked every component of the 4 square array and everything
> checks out FB.
> So, my thought is someone in the neighborhood got a new electronic gismo for
> Christmas. When I listen on the 400 KHZ band, I hear some huge signals
> anytime day or night. Comparing sounds from the ARRL site, I'm thinking a
> light dimmer, phone charger or a dirty wall wort.
> My friend Scott, K2CUB will be here in approximately a week and he has some
> good noise sniffing equipment. Now, for the questions:
> 1. If I find a noisy wall wort, will clip on torrids help suppress
> the hash or does it need to be changed out with a new one?
> 2. Regarding light dimmers, what is the resolution for those devices.
> 3. How about plasma TV?
> Any other input appreciated. I never knew just how quiet my QTH was until
> now HI. 73 and HNY Bob K3UL
> 4. something new
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