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[Karl Winkler]

For those of you who have deal with musicals, etc where large quantities of wireless mics are used: do you use one antennae combiner system or is there a better or cheaper method? Thanks.

I want to add on to what Pete said. Successive cascading can add the problem of ringing at the edges of the passband.

I agree that cascading more than once can cause problems, and certainly using proper active splitters for a large RF system is the way to go. The musical theater systems I've been involved with have used either Lectrosonics systems or a combination of Lectrosonics and other brands, usually Sennheiser and some Shure.

RF is RF, so if you are using combined systems, just watch for the passbands of the filters and/or splitters. Also, as Pete and others have pointed out, watch for the DC bias on the antenna lines. Most passive antennas are OK with DC, but you need to be sure (the older SNA600 dipole is not, for instance, but the newer SNA600A is). And of course if you are using active antennas (hopefully only to overcome line loss) then you'll need the DC on the line from somewhere.

[Ike Zimbel]

I want to add on to what Pete said. Successive cascading can add the problem of ringing at the edges of the passband.

I agree that cascading more than once can cause problems, and certainly using proper active splitters for a large RF system is the way to go. The musical theater systems I've been involved with have used either Lectrosonics systems or a combination of Lectrosonics and other brands, usually Sennheiser and some Shure.

RF is RF, so if you are using combined systems, just watch for the passbands of the filters and/or splitters. Also, as Pete and others have pointed out, watch for the DC bias on the antenna lines. Most passive antennas are OK with DC, but you need to be sure (the older SNA600 dipole is not, for instance, but the newer SNA600A is). And of course if you are using active antennas (hopefully only to overcome line loss) then you'll need the DC on the line from somewhere.

AND, since no one else has mentioned it: A proper frequency coordination is absolutely essential to making any large quantity of wireless work.

[Jens Palm Bacher]

I want to add on to what Pete said. Successive cascading can add the problem of ringing at the edges of the passband.

I agree that cascading more than once can cause problems, and certainly using proper active splitters for a large RF system is the way to go.

My experience working with Sennheiser 3732/2050, Wisycom MRK960 and Shure UR4d+ is that cascading 4-6 units is not a problem in any way. Just don't connect different bands.

[Dan Currie]

I want to add on to what Pete said. Successive cascading can add the problem of ringing at the edges of the passband

Can you elaborate on the 'ringing'?  Is this a reference to the edges of a units pass band being less sensitive the further it is down in the cascade?   

[Karl Winkler]

Can you elaborate on the 'ringing'?  Is this a reference to the edges of a units pass band being less sensitive the further it is down in the cascade?

Dan, sorry I didn't see your question earlier for some reason.

Ringing refers to fluctuations in the sensitivity of the system at the edges of the band, so on some frequencies, you can indeed see a loss of sensitivity, and on others, there is greater sensitivity, along with greater sensitivity to overloading from unwanted sources.

[ProSoundWeb Community]