Interesting. I have an older treadmill here (15 years+) but have not
seen that type of RFI. The bad news is that it needs to be replaced and
I'll probably have this issue with a new one.
Good news is though that I can't work out and operate at the same time.
And the tv is usually not on if I'm in the shack unless the wife is home
at the same time. Usually not very often though.
Amazing the sources of RFI these days. I'm still hanging on to most of
my 15+ year old appliances just to stay away from newer RFI generators.
But like you said, they can radiate over some long distances so I'm sure
I'll hear my neighbors stuff like Fred.
Looks like I might have to pour over Jim, K9YC's RFI doc again ;-)
73,
Dave W8FGU
On 04/30/2013 11:03 AM, Phil Hystad wrote:
RFI...
I have a very pronounced noise on my K3 (and, my Icom Pro III too) on the 80
meter band and it has peaks about 20KHz apart. Very broad (P3 wave form about
6000 Hz wide and it has slightly bell-shape) and very distinctive in the noise
sound you hear on SSB audio.
I know the source though -- it is my wife on the treadmill. You can almost see
and hear the motors and treadmill belt moving by the subtle pulsating of this
RFI on the K3 and P3. It is strong too -- peaks at about 40/9. And, as an
experiment, I got into my truck with my mobile rig (Icom 706) and drove off. I
was a quarter of a mile away by the time the signal strength dropped to a level
that I could not hear it anymore. So, if this is the kind of thing bothering
you it does not need to be close.
The good news is that we both prefer going to LA|Fitness rather than work out
in our little home gym so this is no longer a big issue but it still happens
maybe a few times a month when my wife chooses to work out here. But, usually
that is when I am at work or not on 80 meters which is almost always at night.
73, phil, K7PEH
On Apr 30, 2013, at 7:29 AM, Dave Van Wallaghen <[email protected]> wrote:
Fred,
I have a plasma tv here and that sounds close to what I see when it is on. It
pretty much wipes out the AM BC band and very ugly for all ham bands 160-10m. I
can take a snapshot with my P3 and send it to you if you'd like to compare.
Ironically, I just had a daytime RFI issue resolved here. It started a few
months ago. I would come home from work in the morning and listen around for
awhile and notice the noise would start when the sun came up. Eventually, I
noticed it went away at night. It was prominent on 160-20m and it was only
detectable on my vertical dipole. I could not hear it on my doublet about 60'
away. It was like very rapid lightning type pulse noise. I was starting to
think one of my neighbors may have installed a new solar panel array.
Long story short, I finally eliminated power sources in the house without
relief. I then realized that the vertical dipole was near a garden with some
2-3 year old solar lights my wife put in there. Removing the lights and
batteries eliminated the noise. A couple of the fixtures had water in them and
my guess is they were the problem. Crazy to think a little solar charger like
that could raise so much hell ;-)
73,
Dave W8FGU
On 04/29/2013 10:17 PM, Fred Jensen wrote:
I usually check into the No Cal Net on 3533 each night. I've begun to
get predictable noise with a unique signature on the P3 WF. It's a
series of bands, the first [around 3545] is the widest, they get
narrower up from that and the separation seems to be about 40 KHz. The
higher components get narrower but aren't any weaker.
Occasionally I've see it come on to an otherwise quiet band, and all the
"bands" on the WF drift some before stabilizing.
I have a screen shot from the P3 I'll send, anyone have any idea what
this is? I never see it in the daytime on any band, just in the
evening, which is suspicious ... plasma TV?
If it's my neighbor Casey, I'll just need to live with it, we don't do
battle with our neighbors. Besides, Sampson, their cat, gets along with
ours and shares his food.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
