[Top] [All Lists]

Re: [RFI] distance to rfi source?

To: rfi@contesting.com
Subject: Re: [RFI] distance to rfi source?
From: Sam Morgan <k5oai.sam@gmail.com>
Date: Sun, 09 Jan 2011 17:47:46 -0600
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Last night we had a little rain here, maybe 1/2 inch or so.
and I was looking at the bands with the P3 again and seeing differences.

Jan 5, 2011 I was seeing noise humps about every 110kc on 160m, 60m, 40m, 15m, 
12m, 10m.

Today Jan 9, 2011 I have some new pan adapter images that are showing those 
humps are now every 52-54 kc apart on 30m, 20m, and 17m.

I attached the images side by side on the same page
(scroll to the bottom of the page)

any comments ideas?

GB & 73
Sam Morgan

On 1/6/2011 3:06 PM, Sam Morgan wrote:
> here is all the info I have so far:
> http://pages.suddenlink.net/k5oai/2011-rfi-noise.html
> the posted recordings are the ones that contained some buzz or something,
> I didn't save or post the ones that just sound like noise floor.
> GB & 73
> Sam Morgan
> On 1/6/2011 12:48 PM, RFI Services' Michael Martin wrote:
>> Absolutely not. Actually the rule of thumb, for lack of a better term at the
>> moment, is just the opposite. RF signals usually travel further at lower
>> frequencies. However this is also affected by the resonance of the antenna
>> being used and the distance between the source and the antenna. If an
>> antenna is equally resonant on 80 meters and 10 meters and the source were
>> 10 meters away from the antenna the RF wave length would reach the antenna
>> at the resonant peak and would be stronger than a noise that reached the
>> same antenna at the null of the 80 meter wave length while monitoring the 80
>> meter band.
>> Sorry I'm on a break from applying these principles and can't elaborate
>> further.
>> Ask your RFI investigator to call me and I'll be happy to assist him and
>> explain.
>> Michael C. Martin
>> RFI Services
>> 6469 Old Solomons Island Rd
>> Tracys Landing, MD 20779
>> www.rfiservices.com
>> 240-508-3760
RFI mailing list

<Prev in Thread] Current Thread [Next in Thread>