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Author Topic: Need Help / Suggestions For IEM RF Issues  (Read 4120 times)

Ike Zimbel

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    • Zimbel Audio Productions
Re: Need Help / Suggestions For IEM RF Issues
« Reply #70 on: November 14, 2017, 10:50:20 am »

I had a bad day at the office a couple days ago!!!! And it only supports my theory on RENT FROM LOCAL PROVIDERS.

I was doing a show for Ready Pac. We had their CEO's giving a little pep talk to about 250 employee's at the plant. Did not 1, but 2 RF scans and came up with the same results both times. Off we go. Something changed from earlier that morning til the time it was too late to do anything about it. After the room filled with people the body packs distributed and on, the RF lights are dancing like a bouncing ball to a song. Except for the rented units that were another band...... The rented units were from a local provider and were in the 400 band while the company owned ones were in the 600 band. We were only 50' away and with directional paddles and still no diversity..... Needless to say we had to swap a body pack mid presentation because of dropouts.

RF can change on a whim. What changed I am not exactly Shure...... but I was not happy and neither was my boss or the client. You can do everything right and still throw a bomb every now and then. I didn't have Wireless Workbench because we didn't have all the RF networked so I had to do the old fashioned scan one unit, turn on the packs and then scan the next units etc. Turn off all units and see how the noise floor looks. In my case all was great until it was too late.
Sounds like NO FUN. A few points / questions come to mind:
1) Were you using Shure paddles, and if so, which model and what gain setting were they on? If they were the old model, the +3db setting would have been the preferred setting (although NO gain would be best). With the new ones, 0 or -6db. Too much gain is not your friend, ever.
2) WWB can be used to coordinate a set-up, even if all of the units are not networked. With just one unit connected you can do a scan (although only in the range of the unit). In this case, the 470MHz rental gear would not have been included in your scan. In any case, even without a scan you can use the coordination tab to come up with a list of coordinated frequencies for all of the units.
3) Scanning one unit at a time is better than nothing, but it is not a coordination. The only "coordinated" way that can work is if you scan one unit, let it find the Group that has the most available frequencies, and then allocate it and the other channels into that Group, and only that group. Once you go out of the group, you are off-roading.
~Ike Zimbel~
Wireless frequency coordination specialist.
Manufacturer's Representative (Canada)
Radio Active Designs
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