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weird RFI issue

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TechnoWeenie

Post subject: weird RFI issue

Posted: Sat Aug 30, 2014 9:52 pm

Joined: Wed Jun 27, 2007 10:55 pm
Posts: 497
Location: Britain

So. .. doing some casual scanning. .. and my scanner stops on what I thought was a birdie.

Well... not so much. . It's the audio output from my cellphone. .

no bt.. no WiFi. ... but the audio from my phone is coming across my scanner. No mic audio, only audio output.

Will post video shortly.

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Oh! Come and see the violence inherent in the system! Help, help, I'm being repressed!

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Jim

Post subject: Re: weird RFI issue

Posted: Sat Aug 30, 2014 10:25 pm

Angus Cheeseburger

Joined: Thu Feb 19, 2004 5:09 pm
Posts: 4759
Location: CN88st

What frequency is it showing up on your scanner?

Which scanner is it and does it happen on other scanners?

How close to the scanner does your phone have to be to do this?

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" SILENCE IS CONSENT "

Jim N7UAP - Bellingham, WA / InterceptRadio.com

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nickcarr

Post subject: Re: weird RFI issue

Posted: Sun Aug 31, 2014 11:46 pm

Joined: Mon Jan 03, 2005 1:17 am
Posts: 2643
Location: Lost on 405

I had something similar in the dark ages with a particular VCR. Back when you could use the VCR's tuner as your main CATV tuner, I could tune to any channel and hear the audio output from that channel on X frequency. I can't recall the frequency off hand. The cool thing was that only the VCR had to be powered on. The TV didn't. So you could hear audio even if the TV was off.

As Jim suggested the range was quite limited. I want to say a < 50ft or so to have remotely decent audio quality.

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TechnoWeenie

Post subject: Re: weird RFI issue

Posted: Mon Sep 01, 2014 12:55 am

Joined: Wed Jun 27, 2007 10:55 pm
Posts: 497
Location: Britain

Jim wrote:

What frequency is it showing up on your scanner?

that's what's wierd.... all across the spectrum...

104.x WFM 26th AM...866ish NFM....

Quote:

Which scanner is it and does it happen on other scanners?

bct15x...no others..

Quote:

How close to the scanner does your phone have to be to do this?

another wierd thing....

it's more about angle than distance.... laying flat 3 feet away is good but right next to it or on top of it...in just about any position..and nothing....

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Oh! Come and see the violence inherent in the system! Help, help, I'm being repressed!

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Jim

Post subject: Re: weird RFI issue

Posted: Mon Sep 01, 2014 6:55 am

Angus Cheeseburger

Joined: Thu Feb 19, 2004 5:09 pm
Posts: 4759
Location: CN88st

It must be getting into the IF section of the BCT15X.

In our van if it is turned on it locks up 150.955 on all my scanners.

That is probably the ECM doing that.

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" SILENCE IS CONSENT "

Jim N7UAP - Bellingham, WA / InterceptRadio.com

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cparris2

Post subject: Re: weird RFI issue

Posted: Tue Sep 02, 2014 7:40 am

Joined: Sat Mar 27, 2004 9:49 am
Posts: 722
Location: Social Distancing for now

Jim wrote:

That is probably the ECM doing that.

Electronic Counter Measures? That's one hell of a van! :-)

- Chris

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Chris Parris
Federal Wavelengths columnist
The Spectrum Monitor Magazine
chrisparris@thefedfiles.com

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Jim

Post subject: Re: weird RFI issue

Posted: Tue Sep 02, 2014 7:42 pm

Angus Cheeseburger

Joined: Thu Feb 19, 2004 5:09 pm
Posts: 4759
Location: CN88st

This kind

Attachments:

ECM.jpg [ 8.54 KiB | Viewed 2370 times ]

_________________
" SILENCE IS CONSENT "

Jim N7UAP - Bellingham, WA / InterceptRadio.com

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N7QOR

Post subject: Re: weird RFI issue

Posted: Thu Sep 04, 2014 11:26 am

Joined: Wed Jun 09, 2004 4:15 pm
Posts: 1654
Location: Destination Unknown

It is quite clearly a bug.

Likely Federal due to your limited ability to receive it on consumer grade electronics. Most likely not MIL, as you would not be able to pick it up at all.

Obviously the usual solutions, foil wrapping, use of "burner phones", etc would be in order.

Let us know how it qoeks out, if you can...

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