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Author Topic: UHF FHSS Device  (Read 3902 times)

Dan Currie

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UHF FHSS Device
« on: October 31, 2016, 10:35:09 pm »

I have 68 frequencies to coordinate today and found most of the Shure G band filled with a spread spectrum device.  Luckly I only have 16 UHFR's down there.  This is the first time I've come across something like this in our 470-698mhz range.  Any thoughts as to what it is?  It's concerning to me that the device isn't limited to a small 6mhz chunk.  The show is in a building at the heart of downtown Detroit, Campus Martius viscinity.  I'll be there the next two days and will hopefully have more time to investigate now that the initial setup is done.

Apparently my embedding skills are lacking... :-\ so here's the link...

https://www.youtube.com/watch?v=oEpmiPlZqEg&feature=youtu.be

« Last Edit: October 31, 2016, 11:51:16 pm by Dan Currie »
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Pete Erskine

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Re: UHF FHSS Device
« Reply #1 on: November 01, 2016, 12:24:23 am »

I have 68 frequencies to coordinate today and found most of the Shure G band filled with a spread spectrum device.  Luckly I only have 16 UHFR's down there.  This is the first time I've come across something like this in our 470-698mhz range.  Any thoughts as to what it is?  It's concerning to me that the device isn't limited to a small 6mhz chunk.  The show is in a building at the heart of downtown Detroit, Campus Martius viscinity.  I'll be there the next two days and will hopefully have more time to investigate now that the initial setup is done.

Apparently my embedding skills are lacking... :-\ so here's the link...

https://www.youtube.com/watch?v=oEpmiPlZqEg&feature=youtu.be


It is a white space video transmission system.  Legally if you register the tv channel you plan to use 30 days in advance that device should automatically shut off.  If you are a licnesed user you can register it the same day, I believe.


http://whitespaces.spectrumbridge.com/Main.aspx


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Jason Glass

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Re: UHF FHSS Device
« Reply #2 on: November 01, 2016, 12:41:06 am »


It is a white space video transmission system.  Legally if you register the tv channel you plan to use 30 days in advance that device should automatically shut off.  If you are a licnesed user you can register it the same day, I believe.


http://whitespaces.spectrumbridge.com/Main.aspx
Dan and Pete,

I saw the exact same thing in Phoenix the day before the 2015 Super Bowl, inside a TVBD prohibited zone, and then again this year at Nissan Stadium during CMA Music Fest in the center of my registered circle, all over BTR ranges 3 and 4. In Phoenix, I notified Karl Voss (NFL head of tech & Freq Coordinator) and no one could identify it. The Dept of Homeland Security and US Secret Service were operating nearby (USSS is always frequency-covert) but that wasn't the case in Nashville.

FWIW, I'm unaware of any FHSS DVBD that are currently type-certified, and the video distribution systems that I've seen TX use 8VSB modulation, which looks just like any other DTV station.

 https://en.m.wikipedia.org/wiki/8VSB

Something rotten and disruptive to our work is going on here...

Sent from my mobile phone. Please excuse the inevitable spelling and grammatical errors.

Pete Erskine

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Re: UHF FHSS Device
« Reply #3 on: November 01, 2016, 11:41:01 am »

Something rotten and disruptive to our work is going on here...

Very strange - could be some illegal, of course, device bought in the interweb.....

if you see it again and still cant locate it, fire up a few ULXD transmitters in the same band and see what doesn't work any more.
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Jason Glass

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Re: UHF FHSS Device
« Reply #4 on: November 01, 2016, 11:43:41 am »

Very strange - could be some illegal, of course, device bought in the interweb.....

if you see it again and still cant locate it, fire up a few ULXD transmitters in the same band and see what doesn't work any more.
Will do, with pleasure. :-D

Sent from my mobile phone. Please excuse the inevitable spelling and grammatical errors.

Dan Currie

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Re: UHF FHSS Device
« Reply #5 on: November 01, 2016, 09:03:01 pm »

Rehearsals went great today.  No issues...but the ghost of Hedy Lamarr came back a few hours after call time.  If it's around tomorrow after the show I'll see if I can find her.
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Jason Glass

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Re: UHF FHSS Device
« Reply #6 on: November 01, 2016, 09:13:46 pm »

Rehearsals went great today.  No issues...but the ghost of Hedy Lamarr came back a few hours after call time.  If it's around tomorrow after the show I'll see if I can find her.

Hi Dan,

I love the Hedy Lamar reference! Props!

You're using a BB60C, right? That's also my instrument of choice.

It has me wondering, though, if this might be something actually generated by our hardware. Unfortunately, I can't afford a lab quality instrument that sweeps fast enough to consistently catch these signals.

I can say with confidence, though, that these were not only shown by the measurement readout; my mic receivers' meters were showing momentary hits and the BTR users complained about dropouts while this was going on.

Sent from my mobile phone. Please excuse the inevitable spelling and grammatical errors.

Jason Glass

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Re: UHF FHSS Device
« Reply #7 on: November 02, 2016, 01:21:28 pm »

Happening right now at Music City Center in Nashville, TN.  Within 1000ft. of the center of James Stoffo's BAS-LP registered TVBD-prohibited location for the CMA Awards.  Measured by two different instruments, walking around the venue, so these are real signals and not self-generated instrument noise.

Edit: Here's a link that should work for Android users:

https://www.youtube.com/watch?v=Xzhepe4gEvU&feature=youtu.be
« Last Edit: November 02, 2016, 05:10:43 pm by Jason Glass »
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Ike Zimbel

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Re: UHF FHSS Device
« Reply #8 on: November 02, 2016, 04:17:37 pm »

Happening right now at Music City Center in Nashville, TN.  Within 1000ft. of the center of James Stoffo's BAS-LP registered TVBD-prohibited location for the CMA Awards.  Measured by two different instruments, walking around the venue, so these are real signals and not self-generated instrument noise.

http://cleanwirelessaudio.com/2016-11-02 11-52-03-897.avi
Lately I've been making a point of walking around for a few blocks around the venue and looking for TV ENG vans. This doesn't sound like what they usually carry (mainly Lectrosonics IFB's) but it might be worth a look-see. Presumably whatever it is didn't walk in. Good luck!
iz
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Jason Glass

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Re: UHF FHSS Device
« Reply #9 on: November 02, 2016, 04:47:56 pm »

Lately I've been making a point of walking around for a few blocks around the venue and looking for TV ENG vans. This doesn't sound like what they usually carry (mainly Lectrosonics IFB's) but it might be worth a look-see. Presumably whatever it is didn't walk in. Good luck!
iz

Indeed, I had to shut down an uncoordinated IFB in an ENG van right outside the arena door yesterday.

This signal is way outside the norm for commercial audio gear, and seems to be a mystery.  I tried to sniff out the source this morning and had no luck localizing it to a device.

ProSoundWeb Community

Re: UHF FHSS Device
« Reply #9 on: November 02, 2016, 04:47:56 pm »


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