On 8/16/2010 2:12 AM, Kelly Johnson wrote:
> I found the source with portable gear. I wouldn't think about
> knocking on someone's door if I wasn't at least 95% certain. I
> determined it was this house by walking the street in front of this
> house and walking along the railroad tracks that are behind this
> house. When I walked up to this house's front door the S-meter on my
> portable FT-817 read S7 on 12m. It read S0 when standing at the front
> door of the house on the left and S0 when standing on the sidewalk in
> front of the house on the right. I initially narrowed it down to this
> house and the one on the left by walking the railroad track behind the
> house.
>
> I agree...I've never heard a computer that noisy either, but then
> again I've never heard ANY RFI this loud in my 35 years as a ham.
I haven't heard it recently be I've had on occasion broad band noise
that extends from the top of 6 meters (it may go higher) down to some
where between 20 and 40. When it's on that whole section of the spectrum
is useless. I've mentioned before, it's the one that hides every time
go looking for it. I've made it a hundred yards South to the E/W road
and as soon as I've turned either way the thing has stopped and does not
come back on when I go home.
I've never been able to pin it down to day or night, rain or shine, but
it's not bothered for a while. OTOH The only band I can get on at
present is 40, plus 144 and 440
73
Roger (K8RI)
> It's S9+ on 40m and 20m and not much less than that until you get
> above 28MHz. I don't know what it is, but I'm pretty much out of
> operation until it is fixed one way or another.'
>
>
> On Sun, Aug 15, 2010 at 10:25 PM, Roger (K8RI)<k8ri@rogerhalstead.com> wrote:
>> I'd work at pinning it down more specifically using portable gear
>> before making enemies.
>> I've never heard a computer in those ranges, but I sure have heard the
>> network on 147.00.
>> Your problem *might* be coming from beyond them in that direction, or at
>> least you can hope so.
>> As to computers specifically, I've found the more powerful ones tend to
>> be the cleaner ones. It's the cheap PSupplies that make noise, but I've
>> never heard a 700 watt plus PS put out much hash unless something has
>> gone wrong with one of the rails or filtering. OTOH I'm not so sure
>> about peripherals and particularity those on USB.
>>
>> I had never heard my own wired network on any of the rigs. Not enough to
>> break the squelch unless it was in an HT setting on the computer.
>> However, a few weeks back we were using 58 simplex for some tower work.
>> The network runs underground in PVC conduit within about 10' of the
>> tower base. It was totally wiping out the HTs. I didn't get a chance
>> to switch to the 440 band, but nada on HF.
>>
>> Good Luck,
>>
>> Roger (K8RI)
>>
>>
>>
>> On 8/15/2010 10:19 PM, Kelly Johnson wrote:
>>> It took me two weeks, but I'm now about 99% certain that I found the
>>> source of my horrible RFI problem. It's a house about 100 yards from
>>> me. A group of questionable renters just moved into that house a few
>>> weeks ago. The noise is worse than anything I have ever heard. It's
>>> S9/S9+ on 40m through 10m; dropping down to S7 or so on 6m (all while
>>> I beam that direction, which is unfortunately the direction I must
>>> beam for the East Coast from here in CA). I can null it out if I beam
>>> perpendicular to that direction, but unfortunately, there aren't that
>>> many stations of interest directly north or south of me :-(
>>>
>>> When I told the renter today that I have heard the noise start at 8am
>>> the last 2 days, his first response was: "there's a guy here that has
>>> a very, powerful computer that he turns on at 8am". He asked the guy
>>> to turn it off to see if it was the source and the guy clamed to have
>>> done it, but I don't believe he did. I think he was just trying to
>>> get rid of me. The noise was still there. When I asked the guy if he
>>> would be willing to shut everything off to see if it went away he said
>>> no. I don't know what to do now. My HF station is nearly worthless
>>> at this point with S9+ noise. I can't hear much of anything above the
>>> hash. My S meter read S0 last night at 10:30pm and still S0 this
>>> morning from 6am until 8am. I was sitting in front of the radio at
>>> 8am when the noise came on. The S meter instantly jumped from S0 to
>>> about S7. It slowly got worse until it peaked at S8 on CW in a CW
>>> 250HZ bandwidth and S9+ in a 2KHz bandwidth on SSB.
>>>
>>> Any advice (other than move, wait for these guys to move, or something
>>> illegal)?
>>> _______________________________________________
>>> RFI mailing list
>>> RFI@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>
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