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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => Wireless and Communications => Topic started by: Iggy Birch on July 13, 2015, 02:57:59 PM

Title: IEM RF Question
Post by: Iggy Birch on July 13, 2015, 02:57:59 PM
goal: have 1 helical split into a rf analyzer and IEM combiner in order to monitor rf in real time from the same antenna as the IEMs

are there consequences to using a splitter on the bnc from the helical to feed both the spectrum analyzer and combiner simultaneously, does this reduce the quality of the rf being received?

Title: Re: IEM RF Question
Post by: Doug Fowler on July 13, 2015, 03:04:35 PM
Read the rules, fix your display name.

Thank you for your cooperation.
Title: Re: IEM RF Question
Post by: Jim McKeveny on July 16, 2015, 11:09:05 AM
goal: have 1 helical split into a rf analyzer and IEM combiner in order to monitor rf in real time from the same antenna as the IEMs

are there consequences to using a splitter on the bnc from the helical to feed both the spectrum analyzer and combiner simultaneously, does this reduce the quality of the rf being received?

Yes and yes.

Why compromise transmission power with a split?

Why only consider RF radiation from the pattern of the helical in your analyzer?
Title: Re: IEM RF Question
Post by: Jens Palm Bacher on July 16, 2015, 03:16:23 PM
goal: have 1 helical split into a rf analyzer and IEM combiner in order to monitor rf in real time from the same antenna as the IEMs

are there consequences to using a splitter on the bnc from the helical to feed both the spectrum analyzer and combiner simultaneously, does this reduce the quality of the rf being received?
The RF from the combiner will totally overpower the received signals from the antenna in your spectrum analyzer. Even with circulators etc. you will only be able to see the carriers from your IEM system.
Get a wideband omni antenna for the spectrum analyzer and place it as far away rom you IEM transmit antenna as possible.
Title: Re: IEM RF Question
Post by: Henry Cohen on July 16, 2015, 05:58:08 PM
goal: have 1 helical split into a rf analyzer and IEM combiner in order to monitor rf in real time from the same antenna as the IEMs

are there consequences to using a splitter on the bnc from the helical to feed both the spectrum analyzer and combiner simultaneously, does this reduce the quality of the rf being received?

In addition to Jens' point, the aggregate RF power level from the IEM combiner output will almost certainly overload, if not damage the analyzer input.