[RFI] There goes the neighborhood.....

[Dave Cole (NK7Z)]

Hi,

Yes I did play around with capture count...  I selected a number, then 
ran the program for a few hours, and looked to see how much of the 
screen was filled.  I then used that data to infer the right number to 
use to get a 24 hour capture that just filled my empty frame.

Someplace I found a method to calculate the correct number, but it only 
worked on one machine.  If I applied the same procedure o a different 
machine it would fail...

So I just punted and used the method outlined above.  I seem to remember 
getting a capture every 15 or 20 seconds to fill the screen...  It all 
depends on the resolution you are using.

I have a set of numbers I use, that fill the screen in 24 hours, 12 
hours, and 4 hours...  I use different time resolutions to help pin down 
start times, or to view the RFI in a different time window...

73s and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL Asst. Director, NW Division, Technical Resource

On 5/22/19 6:20 PM, Jamie WW3S wrote:
> Thanks Dave....attempting to setup a RSP1A for the screenshots as you 
> described.....1920 seconds, every 32 minutes? Is that enough to capture? 
> Did you try any other time frames?
> 
> ------ Original Message ------
> From: "Dave Cole (NK7Z)" <dave at nk7z.net>
> To: rfi at contesting.com
> Sent: 5/21/2019 12:31:48 PM
> Subject: Re: [RFI] There goes the neighborhood.....
> 
>> See my article in the March issue of CQ magazine, or visit:
>>
>> https://www.nk7z.net/sdr-rfi-survey-p1/
>>
>> If it were me, I would be documenting my current RFI environment, 
>> using the technique described in both articles...  That way, you know 
>> and can document what you have now...  PRIOR to turn on!
>>
>> Start a log of every person you talk to, by name, include date and 
>> time, in addition to what was discussed.
>>
>> Be friendly, nice, but take notes on everything you say, what was said 
>> to you, and what you do.
>>
>> Read up on Part 15...  Approach is everything, be nice, don't 
>> threaten, don't cause a stink, always leave yourself in a position you 
>> can defend...
>>
>> I would also contact the ARRL Labs for some advice as well, prior to 
>> talking to anyone... Paul replaced Mike Gruber there, and he seems to 
>> be a good fellow to know in these sorts of situations.   But do start 
>> your documentation process today!
>>
>> 73s and thanks,
>> Dave (NK7Z)
>> https://www.nk7z.net
>> ARRL Technical Specialist
>> ARRL Volunteer Examiner
>> ARRL Asst. Director, NW Division, Technical Resource
>>
>> On 5/21/19 9:03 AM, Jamie WW3S wrote:
>>> Never thought I'd see it here in perpetually cloudy NW PA, but the 
>>> neighbor across the street is getting some sort of roof mounted solar 
>>> array installed.....I tried striking up a friendly conversation with 
>>> the installers about what kind of system it was, but when they heard 
>>> "ham radio" and "interference", that was the end of the 
>>> conversation....the one guy said they never had a problem with radio 
>>> interference before, but when I asked if they ever installed one next 
>>> to an amateur radio operator, he couldn't say.....soooooo......what 
>>> should I expect? Hopefully, there will be no issues, but if there is 
>>> ?!?!?!?!?
>>> _______________________________________________
>>> RFI mailing list
>>> RFI at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>> _______________________________________________
>> RFI mailing list
>> RFI at contesting.com
>> http://lists.contesting.com/mailman/listinfo/rfi
>