Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Lyle Williams]

Try using regular antennas.

The interference may be as a result of the amps in the paddles being overdriven by a nearby toy.

[Jens Palm Bacher]

I could see them having a lot of money tied up in the toys and being rather reluctant to stop selling them.

Bingo...!
We optimised on the antenna placement and moved frequencies, so now we have a "good enough" wl performance, and they can sell the tous.

[Jens Palm Bacher]

Try using regular antennas.

The interference may be as a result of the amps in the paddles being overdriven by a nearby toy.

We are using passive paddles, no need to amplify all the noise

[Diogo Nunes Pereira]

Apparently they come with a built in Rf noise generator, this is what caused the interference in the video.

Hi Jens, do you have a scan of the noise? Wondering how it looks like... Is it wideband? Random peaks?

Enviado desde mi XT1072 mediante Tapatalk

[Jens Palm Bacher]

Hi Jens, do you have a scan of the noise? Wondering how it looks like... Is it wideband? Random peaks?

Enviado desde mi XT1072 mediante Tapatalk

It looks like this on a 9000 system, on a spectrum analyzer it looks like very fast moving peaks, so fast that they are not detected by the Rf meter on older analogue receivers.

[Jens Palm Bacher]

Hi Jens,

Out of curiosity, how did the 6k perform under these conditions? Were there audible dropouts or artfacts?

Sent from my Nexus 5 using Tapatalk

No audible artifacts, but dropouts (audio muting) with performers backstage etc. when i would have expected the system to work under normal RF conditions. They had used a ULX-D system before that performed worse, which is understandable considering the ULX-D beeing switching diversity and the 6000 true diversity.
Generally our 6000 and 9000 systems perform very good, we have just completed a large outdoor theatre play, very close to a large DVB-T broadcast transmitter without any problems.

[Lyle Williams]

The key to understanding receiver interference is to understand that many of the signals heard on a receiver (or visible on a spectrum analyser) do not actually exist "on air".

They are the result of imperfections in the receiver and pre-amps in front of it.

[Henry Cohen]

The key to understanding receiver interference is to understand that many of the signals heard on a receiver (or visible on a spectrum analyser) do not actually exist "on air".

They are the result of imperfections in the receiver and pre-amps in front of it.

When using lesser caliber equipment with low IP3 ratings. And it's not so much "imperfections" as it is saturation of the non-linear stage.

[Lyle Williams]

I struggled to find the right word.  Imperfections was not meant to mean "man, this receiver must have been built last thing on a Friday afternoon" but to indicate that things that we think of as perfectly linear are really "close enough to linear, in the absense of overload"

What we get out of a receiver is the receiver's response to the incoming signals, not the signals that were actually on air.  Under normal conditions this is close enough.

[ProSoundWeb Community]