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Matthias Richter

QRX200 internal PSU introduces noise

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Well, I have ordered mine now, so I'll just have to wait and see (hear). 

I calmed down the noise from my IFB200 with an Audioroot thing (can't remember which one), but that is nuisance of course. The Audioroot needs its own power supply, but maybe - if the problem occurs - I can run both the QRX and the ifb from the same Audioroot box. 

OTOH I have a QRX100, which doesn't induce any noise at all, so maybe, hopefully, I am lucky. 

If not, I know who to call ...

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QRX200s in a bag feeding a Nomad 12.  QRX is using both analog outputs.  Common power supply using NP-1s, feeding everything in the bag which includes a Comtek transmitter, a Zaxcom transmitter (currently on block 26), and I have to crank the Nomad gain way up to hear any noise at all -- just hiss when I turn it up enough.

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I should add, with QRXs on my cart I don't recall any noise anomalies, either.

 

Question:  Do you have an IFB100 or IFB200 running nearby.  Those are a known source of induced whine -- especially if it's on the same power supply.  (Sorry, don't have time to read back through the thread to see if this has already been addressed.)

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me and Kortwich both tested the QRX200 at the time of me purchasing it 2 years ago. Striped the setup down to just the QRX200 feeding a Nomad (even tested with a 788) and nothing else. 2 units same issue. A QRX235 and QRX100 in the very same setup were clean.

But it´s all 2 years old. (meaning I gave up on this one ;-)

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I've also dealt with the whine issue in the past with customer's QRX200s, but I haven't had this problem with mine, which was purchased about one year ago.

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4 hours ago, Glen Trew said:

I've also dealt with the whine issue in the past with customer's QRX200s, but I haven't had this problem with mine, which was purchased about one year ago.

 

So how did you deal with it? I mean, what was the solution if any?

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Well, I am happy to report back that my QRX200 seems to work just fine. It doesn't have the EU modulation anymore, that was a bit of a surprise, but ither than that no whine. That's on my location cart. I also have a studio cart and there the whine was very clearly there. I should say a whine. Could have been something else, I didn't investigate, I just didn't use it. But now on my main cart, everything appears fine so far

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