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Author Topic: RF Venue Diversity fin and long cable runs ?  (Read 370 times)

Nick Andrews

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RF Venue Diversity fin and long cable runs ?
« on: February 14, 2024, 10:20:46 AM »

Hi everyone ,

So I just migrated to a shure slxd setup (g58 frequency  band) I have 8 channels currently with everything networked together , with a antenna distro, sm58 hand helds and slxd1 body packs for lavs and instrument mics. I'm very happy with the sound quality rf performance and features for the $

My question is , I'd love to add something like a rf venue dfin for when I need better coverage for bigger stages or larger events. Diversity fin looks great as it's a single paddle and easier to deploy but my question is , it is passive correct ? So it will not compensate for very long antenna cable runs correct? Any concerns with this ?

I appreciate any insight !

Thanks

Nick
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Brad Harris

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Re: RF Venue Diversity fin and long cable runs ?
« Reply #1 on: February 14, 2024, 11:06:44 AM »

What cable and how long? That determines if you should look into an active element to combat RF signal loss due to cable length.


https://timesmicrowave.com/calculator/

@549MHz (center of UHF band)
LMR400UF -3.6dB/100ft
RG58 -12.2dB/100ft

A directional antenna (passive) will have gain (compared to a dipole antenna), and most wireless systems are fine with 10db of loss before considering adding amplification to reduce cable loss.


BRad
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Don Boomer

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Re: RF Venue Diversity fin and long cable runs ?
« Reply #2 on: February 14, 2024, 11:47:48 AM »

There are a number of factors that are interconnected besides coax length and antenna gain.  A simple way to determine how it is gonna work is to use our free web app to create a link budget.  Just select from the dropdown boxes.  If you get a green light when you push the calculate button it means you have at least a CNR of 20dB (provided your noise floor isnít above -85dBm).

https://www.rfvenue.com/rfvenue-calculator
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Don Boomer
Senior applications engineer
RF Venue, Inc.

Nick Andrews

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Re: RF Venue Diversity fin and long cable runs ?
« Reply #3 on: February 14, 2024, 09:04:41 PM »

Thanks guys!
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ProSoundWeb Community

Re: RF Venue Diversity fin and long cable runs ?
¬ę Reply #3 on: February 14, 2024, 09:04:41 PM ¬Ľ


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