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Author Topic: RF Spotlight-style antenna for VHF?  (Read 510 times)

Jordan Wolf

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RF Spotlight-style antenna for VHF?
« on: March 21, 2019, 05:28:52 pm »

Hi All,

I was wondering if there was a similar unit for VHF?

I saw that Shure makes the UA860V, but it’s a bit different and more unsightly than RFVenue’s offering.

I have a friend doing interview-style video broadcasts, and the LED panel lights are apparently spewing RF hash. I recommended blackwrap on the backside of the panels and placing the panel in the null of the LPDA, but thought there might be other options.

« Last Edit: March 22, 2019, 03:36:49 pm by Jordan Wolf »
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Keith Broughton

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Re: RF Spotlight-style antenna for VHF?
« Reply #1 on: March 22, 2019, 07:28:59 am »

You could try placing 1/2 wave antennas behind the drape, close to the transmitters and that would get away from the rear of the lights and give some distance from the RF noise source.
Looking at the setup in the pics, it seems like a lot more antenna than the job requires.
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Jordan Wolf

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Re: RF Spotlight-style antenna for VHF?
« Reply #2 on: March 22, 2019, 09:39:06 am »

You could try placing 1/2 wave antennas behind the drape, close to the transmitters and that would get away from the rear of the lights and give some distance from the RF noise source.
Looking at the setup in the pics...1
Yeah, that was another suggestion.

Quote
...t seems like a lot more antenna than the job requires.
I agree. Not my event, so I’m not sure what they had access to.
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Ike Zimbel

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Re: RF Spotlight-style antenna for VHF?
« Reply #3 on: March 22, 2019, 10:06:08 am »

Yeah, that was another suggestion.
I agree. Not my event, so I’m not sure what they had access to.
+1 And...make sure that they have the gain switch on the antennas set to the lowest position (I believe it's -6dB). If the switch is, say, in the +12 position, they're going to have lots of issues.
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Jordan Wolf

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Re: RF Spotlight-style antenna for VHF?
« Reply #4 on: March 22, 2019, 10:59:46 am »

...[a]nd...make sure that they have the gain switch on the antennas set to the lowest position...
That’s one thing he did have in-place already. I think repositioning the LPDAs so the LED panels were in the null helped enough.

Aside from shielding via blackwrap, etc., to reduce the RF spew, do you think some 3dB or 6dB pads would have helped lower the overall noise floor so that the received RF would have a higher overall S/N ratio?
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Jerome Malsack

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Re: RF Spotlight-style antenna for VHF?
« Reply #5 on: March 22, 2019, 11:27:20 am »

Band width RF filters RFVenue and others sell but Cost is as high as the antenna. 

Yes placing the antenna behind the curtain works but the wall behind the added metal from the pipe and drape would need some additional space. 
1/4 wave rule for vhf is about 2 feet from wall and pipe and drape metal.  That would put the pipe and drape about 5 feet into the room from the wall to prevent problems.
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Dave Garoutte

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Re: RF Spotlight-style antenna for VHF?
« Reply #6 on: March 22, 2019, 12:36:48 pm »

How about from the ceiling above sight lines?
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Ike Zimbel

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Re: RF Spotlight-style antenna for VHF?
« Reply #7 on: March 23, 2019, 05:42:56 pm »

That’s one thing he did have in-place already. I think repositioning the LPDAs so the LED panels were in the null helped enough.

Aside from shielding via blackwrap, etc., to reduce the RF spew, do you think some 3dB or 6dB pads would have helped lower the overall noise floor so that the received RF would have a higher overall S/N ratio?
Yes. With RF signal levels all you need is enough. IOW, if you use, say, 3dB pads, and the RX still shows full bars on the LED display when the Tx is on, you have just lowered your noise floor by 3dB with no cost to your signal.
From your picture, it looks like the distances involved are quite small, so I suspect you would have quite a lot of RF headroom to work with.
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Matthew Knischewsky

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Re: RF Spotlight-style antenna for VHF?
« Reply #8 on: March 24, 2019, 11:21:15 am »

Hi All,

I was wondering if there was a similar unit for VHF?

I saw that Shure makes the UA860V, but it’s a bit different and more unsightly than RFVenue’s offering.

I have a friend doing interview-style video broadcasts, and the LED panel lights are apparently spewing RF hash. I recommended blackwrap on the backside of the panels and placing the panel in the null of the LPDA, but thought there might be other options.



I know this is the RF forum but the photo would seem to indicate it's a sit-down interview, no audience. Has you friend considered using wired mics?
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Jordan Wolf

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Re: RF Spotlight-style antenna for VHF?
« Reply #9 on: March 24, 2019, 12:36:50 pm »

...Has you friend considered using wired mics?
Knowing the production company, I’m almost certain it would have been discussed beforehand and the client demanded a wireless “solution”. They’re always “right”, right?

I hardwire whenever I can, at the very least for a backup to the backup’s backup, lol.

I’ve never been one to recommend a less-than-ideal solution to achieve a desired look/perception, but that’s not always my decision. Form over function is not my motto.
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Jordan Wolf
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"We want our sound to go into the soul of the audience, and see if it can awaken some little thing in their minds... Cause there are so many sleeping people." - Jimi Hendrix
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