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Author Topic: IEM and DAS  (Read 814 times)

Gian Luca Cavalliini

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Re: IEM and DAS
« Reply #10 on: May 29, 2018, 06:38:09 pm »

Messi and Paoloni (www.messi.it) is an Italian manufacturer of coax cable, well respected among the ham radio crowd.

 Among their product range there is plenty of double shielded coax cable with good specifications. Maybe you can convince your provider to get some of their cable and it being an Italian product might not be difficult to source.


Thanx Diogo! Really appreciate EVERY advice. 30 years of monitor engineering on my shoulder, but just a few years with not easy RF tasks. I study every day as a (good) child, but more I learn, more I need to know...  ;D

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Ike Zimbel

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Re: IEM and DAS
« Reply #11 on: June 05, 2018, 05:57:55 am »

Thanx Henry, I really appreciate your suggestion  :)
I asked for LMR 400 but RG213 is was rental company wants to give me. I have a meeting today, I'll report what you wrote. I'm starting to think in Italy we're missing a company specialised in RF for shows, it's really hard to find lot of items which seems to be pretty important...
Thanx again to all active contributors of this wonderful forum!

GLuca
Wisycom is from Italy. They have some very innovative RF products. https://wisycom.com/about-us/ No one has mentioned this, but amplifying your IEM signal after the combiners is pretty much a non-starter as it will lead to far more problems than it solves. I'm sure Henry can provide more detail on that subject.
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~Ike Zimbel~
Wireless frequency coordination specialist.
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Radio Active Designs
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Gian Luca Cavalliini

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Re: IEM and DAS
« Reply #12 on: June 05, 2018, 06:54:08 pm »

Wisycom is from Italy. They have some very innovative RF products. https://wisycom.com/about-us/

Hi Ike,
I know very well Wisycom, I use handeld MRK with Shoeps capsule from 7 years with one of the bands I usually work as a mon eng, great products. Believe it or not... Wisycom in Italy is not so commonly used in live concerts, I know it's a shame but they don't seems too much interested in italian live market (not so rich, actually...).


No one has mentioned this, but amplifying your IEM signal after the combiners is pretty much a non-starter as it will lead to far more problems than it solves. I'm sure Henry can provide more detail on that subject.

Oh... My idea was to bring back about 10 dB of loss for very long wiring and passive split of the far antenna.


Anyway: the shows I was worried about was some days ago, 75.000 people, 90m x 80m area to cover with 16 IEMs and 24 transmitters (plus opening act, about 8 more frequencies). All went good, no necessity to use RF switch or other "strange" things. But I have some new questions for all of you great RF gurus... I'll go in another thread.

BTW: The show was in Milan, Meazza Stadium (San Siro). I can post here or just on Pete's database) the scans if you want...

BTW 2: No problems also from Google led wireless controlled bracelets, every change of colours was a brief impulse at different frequency but always between 433 and 434 MHz, strong intensity (they used a set of Yagi antennas pointed everywere, located near FOH) but not problematic for me.

Thanx & bye
GLuca
« Last Edit: June 05, 2018, 06:56:22 pm by Gian Luca Cavalliini »
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Short coffee, SHORT coffee, more SHORT coffee... yes, I'm from Italy!
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