[SADXA] [RFI identification
jim_kf7e at cox.net
jim_kf7e at cox.net
Tue Jun 25 15:15:33 EDT 2013
(I changed the subject line, since this thread has nothing to do with a amp
for sale..)
There are several sites online that have recordings to help identify
various sources.
One is at ARRL http://www.arrl.org/sounds-of-rfi
ANother at http://randombio.com/interference.html
And even one at Eham http://www.eham.net/articles/8430
Actually it is a link to: http://www.ve3hls.com/noise/rfihome.html
There are others, but maybe these will help you get started.
There are a couple companies in the Biz making instruments, although there
are much less expensive 'home brew' solutions to making good detectors.
One comany is http://www.radarengineers.com/rfitvi.htm
Their models 330 and 250 I have used with success, and I believe SRP uses
tham in their inventory of tools.
73 Jim KF7E
Original email:
-----------------
From: Tom Kramer tkramer at azci.net
Date: Tue, 25 Jun 2013 09:00:25 -0700
To: sadxa at mailman.qth.net, w7swl at yahoo.com
Subject: Re: [SADXA] HF amplifier for sale
Hi Jerry,
A sad commentary on corporate America but becoming more and more common
as
companies simply ignore regulations until they get litigated in some way.
However, my main objective is to highlight this part of your message:
".. folks ... seem not to either know what they are hearing..."
as that is often my problem. I get all kinds of interference but have a
hard time deterring what it might be.
I am not certain how we might do this but a nifty club program would be
demonstrating what different RFI signals might sound like, not just power
line, but plasma TVs, internet Wi-Fi, washing machines etc. I can with
relative ease record what my neighbors washing machine sounds like on 6m (
and 17, 15,12,10, 2 and 222 mHz). Also can record the Wi-Fi interference
from my ISP on 160 -> 10m. Can others in the group record plasma TV RFI
and other interference that they can identify?
I just had an occurrence this morning while running FSK441 Meteor scatter
on 2m. Suddenly was hit but an S9 noise. Off the center frequency it
sounded like white noise but tuning to the signal peak it was pulsating. I
got out my FT817 and put on a 12 inch wire antenna and walked my yard and
near neighbors houses only to discover it was the USB hub on my own
desktop.
I could copy it up to 100 ft away from the shack. I use it to connect two
USB to serial adapters for connecting my two main radios for computer
interface. Disconnected the hub and connected the USB/serial adapters
direct to desktop ... no RFI. BUT what's even more weird is when I
connected the USB hub to the back of the computer and use it for the
keyboard and Wi-Fi modem and ...NO RFI. Hard to figure out.
----- Original Message -----
From: "JERRY" <jdwothe at cox.net>
To: "Bob Coomler" <w7swl at yahoo.com>; "Southern AZ DX Association E-Mail
Reflector" <sadxa at mailman.qth.net>
Sent: Sunday, June 23, 2013 11:27 AM
Subject: Re: [SADXA] HF amplifier for sale
> Hi Bob:
>
> Well at issue here is we need folks that have RFI to make a list of their
> issues and call them in so we have something to work with.
>
> The problem I personally have is pretty minor however there are folks
much
> closer to a big noise source that seem not to either know what they are
> hearing or it isn't a big enough issue to do something. What I am afraid
> of is one of these days a big source will show up and there is no quick
> path to resolve it as there was when Gary was around. Going the route you
> suggest and what is probably going to have to happen will take weeks and
> maybe even months to resolve.
>
> I mentioned it a few month ago at radio club before Gary retired and the
> reception was like a flock of deer in the headlights. I just cannot
> believe no one in town has RFI problems.
>
> It took Gary and I many months to track down all the issues within about
> 2.5 miles of my place that I could hear on one band or the other. Right
> now it is great but in time that is going to change.
>
> I suspect TEP still has the equipment Gary was using but in time I also
> know corporations send stuff not being use to salvage, then when they
need
> it, it wont be in the budget so they cant go out and buy new.
>
> Thanks for the input.
>
> Jerry
>
>
>
>
> On 6/23/2013 10:46 AM, Bob Coomler wrote:
>> If you are an ARRL member, I'd suggest contacting Mike Gruber, W1MG, at
>> the League headquarters. When I was living in northern California, PG&E
>> kept blowing off my complaints, but Mike was able to work some magic and
>> I had their undivided attention. They ended up bringing in an
>> independent RFI consultant from the east coast. My problem was found,
>> solved and PG&E had the foresight to make it an in-service for the
staff.
>> I doubt that TEP would similarly respond, but Mr. Gruber does seem to
get
>> things done.
>>
>> Bob W7SWL
>>
>>
>>
>>> ________________________________
>>> From: JERRY <jdwothe at cox.net>
>>> To: Southern AZ DX Association E-Mail Reflector <sadxa at mailman.qth.net>
>>> Sent: Sunday, June 23, 2013 10:01 AM
>>> Subject: Re: [SADXA] HF amplifier for sale
>>>
>>>
>>> Hi Ted:
>>>
>>> Sad to say that TEP finds that noise abatement by their power lines is
>>> no longer a concern to them. They have not and do not intend to replace
>>> Gary. Our only first step is to contact TEP and file an RFI complaint. I
>>> have done that and they blew it off without even a reply. Then if I
>>> understand the process we are to file a compliant with the state but I
>>> am not sure who as I have not looked into it. If that does not get them
>>> off the dime then we are to file a complaint with the FCC outlining
>>> dates and who we have contacted regarding the RFI.
>>>
>>> I would hope it doesn't get to that but it might in order for them to
>>> get someone in that position.
>>>
>>> Regarding the tower, it is sold.
>>>
>>> BTW to put that tower up in Pima county would be just about impossible
>>> with the situation we find ourselves in with the county.
>>>
>>> Jerry
>>>
>>>
>>> On 6/23/2013 9:49 AM, Theodore DOWNING wrote:
>>>> Jerry,
>>>>
>>>> Good to see you at SADXA and an interesting talk. I am ready to move
>>>> out into the boondocks after returning home to listen to the urban
>>>> noise. Who is the contact point in TEP now that Gary has retired?
>>>>
>>>> Second, do you still have Donny's tower? I may be interested if it
>>>> has engineering papers...for my new place in the boonies.
>>>>
>>>> Ted w7key
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