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Author Topic: It's loud backstage  (Read 8239 times)

Henry Cohen

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Re: RF direction finding.
« Reply #10 on: November 09, 2011, 01:13:50 PM »

Sometimes it is a spectrum analyzer but even better is a radio reciever which has an RF level meter as well as a way to listen to the audio.  Sometimes you can track them down just by what they say. 

The paddle antenna is very directional and should have a switchable RF pad or attenuator.  This is to lower the level of the RF such that the RF level meter, on the Receiver, is mid scale and you can see it go up and down as you turn the antenna. 

The back of the paddle is the most sensitive to level changes and will be at its minimum when the back is pointed at the RF source.  Take a couple of directional readings ad different places and the intersection will be where your offender is located.

I agree with Pete on most points but LPDA directionality. LPDA's generally have a horizontal beamwidth of about 110 degrees, too wide for effective direction finding. I do agree that if the LPDA is the only directional antenna available, using the rear as he describes is the better option, along with having attenuators available to further knock down the RF signal at the receiver to get better meter deflection.

I've had very good success using more highly directional but out of band antennas as they offer attenuation by their very design. My current choices are a 2.4GHz 12 degree yagi and a 2.4GHz 35 degree corner reflector. (As we have a large inventory of 2.4GHz antennas, they're convenient.) As Pete indicated. using an Icom R10 receiver or the R&S FSH-3 in FM demodulation mode to listen to the chatter gives great clues as to who the offenders are, especially when they mention their callsign or other company identifier.
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Henry Cohen

CP Communications    www.cpcomms.com
Radio Active Designs   www.radioactiverf.com

Henry Cohen

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Re: It's loud backstage
« Reply #11 on: November 09, 2011, 01:28:57 PM »

When they did this show in Miami they had security take back the credentials of press using non-coordinated RF and escort them from the building. It only took a couple before word got out and they got their coordinated frequencies. It is a requirement of the producers that these rules are followed, and all press was notified of the situation in advance. We'll see, the press arrives today.

I have temporarily shut down 3 ENG crews doing preshow stuff so far, all were happy to get clear coordinated channels for their exclusive use.

Effective RF coordination of the media begins back at the event planning stage defining and establishing with the client a comprehensive frequency coordination policy and having that policy be part of the media information packet sent to members of the media who desire to attend. In that press packet I often include a frequency coordination request form where they can request a frequency(ies) within their equipment's bandsplit(s).  On larger events, it's many times necessary to post a member(s) of the RF team at the press check in point on event day(s) to confirm prior coordinations, coordinate on the spot or instruct a media crew they must use hardwire. RF policy enforcement is of course key to successful wireless operations for all. "Coordination protects everyone".
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Henry Cohen

CP Communications    www.cpcomms.com
Radio Active Designs   www.radioactiverf.com

Mac Kerr

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Re: It's loud backstage
« Reply #12 on: November 09, 2011, 01:41:22 PM »

Effective RF coordination of the media begins back at the event planning stage defining and establishing with the client a comprehensive frequency coordination policy and having that policy be part of the media information packet sent to members of the media who desire to attend. In that press packet I often include a frequency coordination request form where they can request a frequency(ies) within their equipment's bandsplit(s).  On larger events, it's many times necessary to post a member(s) of the RF team at the press check in point on event day(s) to confirm prior coordinations, coordinate on the spot or instruct a media crew they must use hardwire. RF policy enforcement is of course key to successful wireless operations for all. "Coordination protects everyone".

Information about the RF coord went out with the press packets, not everyone paid attention. I am the RF team, and I need to move around, so no presence at press check in, I'm not sure there even is one.

We had 6 ENG crews who contacted us in advance, and a few I have already chased down and straightened out. I'm still keeping a weather eye out for a rogue on 486.4 that kills our 486.375 truck audio iso. I'm dying to enforce the "remove credentials and exit building" policy.

Mac
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Henry Cohen

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Re: It's loud backstage
« Reply #13 on: November 09, 2011, 01:53:32 PM »

I'm still keeping a weather eye out for a rogue on 486.4 that kills our 486.375 truck audio iso. I'm dying to enforce the "remove credentials and exit building" policy.
Shall I come over tonight?  ;D
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Henry Cohen

CP Communications    www.cpcomms.com
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Dave Dermont

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Re: It's loud backstage
« Reply #14 on: November 15, 2011, 09:47:10 PM »

I believe Frequency Coordinator is among the lowest paid positions in the NFL
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Dave Dermont

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Re: It's loud backstage
« Reply #14 on: November 15, 2011, 09:47:10 PM »


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