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Author Topic: RF link for festival  (Read 7492 times)

Jordan Wolf

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Re: RF link for festival
« Reply #10 on: July 07, 2014, 01:14:43 PM »


...using a prototype of my soon-to-be-released Android app that calculates RSSI estimates for the "big 3" wireless systems sold in USA.
Looks great!  Any hope of an iOS version? (Someone had to ask)
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Jason Glass

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Re: RF link for festival
« Reply #11 on: July 07, 2014, 07:32:28 PM »

Looks great!  Any hope of an iOS version? (Someone had to ask)

Hi Jordan,

I kind of expected that question to come up. ;)

I've researched it, and the folks at Apple make developers jump through hoops and pay some significant fees for the privilege of running on their platform.   However, if the Android version is successful and shows promise, and the effort and cost required to go iOS appears recoverable, I'll do it.

Don't hold your breath, though!  I'm no coder and my development pace is very, very slow.

Jason Lavoie

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Re: RF link for festival
« Reply #12 on: July 07, 2014, 09:12:01 PM »

I was thinking about the fact that it would probably be better with the LPDA antennas at both ends as polarity would be fixed.
 500' would be the real world distance so it looks like a go.
We will run XLR as well, just to have backup.

Wait wait...
if you're running XLR as a backup, why would you even bother with the wireless link?
am I missing something here?

I wish I remembered who said it first, but the quote goes something like "you can spend thousands of dollars on the best wireless available and it will be *almost* as good as a cable"

Jason
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TonyWilliams

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Re: RF link for festival
« Reply #13 on: July 07, 2014, 10:07:34 PM »


Wait wait...
if you're running XLR as a backup, why would you even bother with the wireless link?
am I missing something here?

I wish I remembered who said it first, but the quote goes something like "you can spend thousands of dollars on the best wireless available and it will be *almost* as good as a cable"

Jason
my thoughts exactly. If you are running copper, why deal with RF?


- Tony Williams
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Jordan Wolf

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Re: RF link for festival
« Reply #14 on: July 07, 2014, 10:44:24 PM »

I understand - I've heard that from others, too.

Best of luck with it!

I'm always looking for tools like that to add to my arsenal...
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Jordan Wolf

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RF link for festival
« Reply #15 on: July 07, 2014, 10:51:12 PM »

my thoughts exactly. If you are running copper, why deal with RF?


- Tony Williams
My thoughts are along the same lines - I don't care what anyone says: as long as a wired connection is a viable option, I'll pursue that first.

I had an event a few months ago that involved getting RF from outside in a tent to a set of speakers inside a building.  I spec'd certain gear, but was only given some of it to complete the task.  A Shure PSM1000 unit with matching RX units, but no LPDAs for TX or RX antennas or the ability to remote the antennas.  So...I got everything as close to line-of-sight as possible and told the people involved what might happen (dropouts, loss of fidelity, etc.) and they were okay with it for that particular situation (background/area music...low volume with lots of people yakking around).

All that said, it would have been much simpler (and more reliable) to run an XLR or two - and it would have been cheaper, too.
« Last Edit: July 07, 2014, 10:54:15 PM by Jordan Wolf »
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g'bye, Dick Rees

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Re: RF link for festival
« Reply #16 on: July 07, 2014, 11:02:49 PM »

It's worth the time to use the wireless link in a real-time, non-critical situation.  If in the future the wireless option becomes necessary, you'll have had a free trial run under your belt.

Also...redundancy.
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Jim McKeveny

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Re: RF link for festival
« Reply #17 on: July 09, 2014, 09:04:29 AM »

At what range of misalignment between RX/TX LPDAs do they become unmatched polarity?
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Pete Erskine

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Re: RF link for festival
« Reply #18 on: July 09, 2014, 09:19:38 AM »

I am going to try setting up an RF link to run main stage sound to a remote location.
Sennheiser G2 IEM transmitte to a helical antenna at the main stage.
Remote will be a log periodic ( no helical available) to mic receiver.
Given the frequency is clear and I have clear line of sight and good weather, what would be a fair estimate of the distance I could reliably cover?

read this Shure article: Point - Point RF
« Last Edit: July 09, 2014, 09:26:37 AM by Pete Erskine »
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Jason Glass

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Re: RF link for festival
« Reply #19 on: July 09, 2014, 11:07:19 AM »

At what range of misalignment between RX/TX LPDAs do they become unmatched polarity?

Hi Jim,

Polarization orientation angle mismatch losses in dB are roughly as follows:

Circular to linear   -3
RHCP to LHCP   -∞
0° (aligned)    -0
15°   -0.3
30°   -1.25
45°   -3.01
60°   -6.02
75°   -11.74
90° (orthogonal)   -∞

As is the case in many RF calculations, these are valid for free space links, in a theoretically perfect environment.  It doesn't account for any of the multipath losses (and gains) that we observe in the real world.  We will almost never see a perfect -∞ null in an orthogonal system on Earth, since many reflected paths will exist, and reflections alter signal polarization angle.  At least one path will almost surely be measurable at the RX antenna.
« Last Edit: July 09, 2014, 11:15:33 AM by Jason Glass »
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Re: RF link for festival
« Reply #19 on: July 09, 2014, 11:07:19 AM »


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