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KRLD's IBOC on?

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DoogieDown1

Guest
I live a few blocks away from KRLD's tower site, and I just started receiving all sorts of interference in my mic cables. All my recordings have a high pitched noise along with garbled traffic updates... :-\

Did KRLD recently turn it's IBOC back on? Or did it change something else at its transmitter in the last week? About a week ago, and further back, I had no interference.
 
DoogieDown1 said:
I live a few blocks away from KRLD's tower site, and I just started receiving all sorts of interference in my mic cables. All my recordings have a high pitched noise along with garbled traffic updates... :-\

Did KRLD recently turn it's IBOC back on? Or did it change something else at its transmitter in the last week? About a week ago, and further back, I had no interference.
Click to expand...

Sounds like one of your cables lost its grounding. Did you do any wiring work recently?

Andy
 
Sounds like one of your cables lost its grounding. Did you do any wiring work recently?
Click to expand...

I just had an electrician out to my home this morning, and the grounding is secure.

But KRLD is still massively interfering when I record from a mic to my computer. I think something has recently changed in KRLD's transmission, because this wasn't occurring just two or three weeks back.
 
Check your mic cables. I assume they are XLR? Or are you using one of those mini headset mics with the 1/8" jack directly into your sound card?

Your problem still sounds like it's being caused from somewhere in your audio wiring, or something.

Andy
 
Check your mic cables. I assume they are XLR? Or are you using one of those mini headset mics with the 1/8" jack directly into your sound card?
Click to expand...

I'm using XLR from my preamp to my mic. But from the mic to my preamp I'm using a cable with XLR at the preamp end, and a 1/4 plug with a 1/8 adapter for the sound card in. The computer is a mac tower, and I've never had interference with this setup before. Just started in the last couple or three weeks. I'm about 4 blocks from the KRLD tower site, so I'm betting KRLD has just made some changes.
 
I highly doubt KRLD is at fault, unless you have a large number of persons within your area experiencing the same or similar type of problem. You basically have a Radio Frequency Interference issue. The most likely cause is a poor shield termination, a.k.a. the "Pin 1 Problem". Most likely you either have recently made changes to your audio wiring, or you have a very old XLR cable with a deteriorating shield termination.

First thing I'd do is look at the XLR to 1/4 cable. Chances are it's a cable intended for connecting the microphone directly, and not a pre-amp. I'd also check the Mic cable itself.

If all the wiring is good, then I'd try an RF Choke. See: http://www.audiosystemsgroup.com/SAC0305Ferrites.pdf for some info on RFI chokes.

Andy
 
Appreciate your pointers, Andy.

Actually, I've tried different cables (bought new ones, in fact). I bought RF chokes last week as well. Made no difference.

I've had KRLD in my telephone before, but that was fixed (filtered out) ages ago.

In fact, the telephone is still fine. It's just that KRLD has appeared in my mic recordings for the last couple of weeks. It's my understanding that KRLD's HD had been off until recently. I wonder what sort of upgrade just occurred.
 
Call KRLD and ask to speak to their Engineer. They may have some additional suggestions for you.

Andy
 
Do you have a USB audio interface/mic pre that you can try out? That may help narrow the problem down a bit.
 
Do you have a USB audio interface/mic pre that you can try out? That may help narrow the problem down a bit.
Click to expand...

Yes. I've got a Digidesign Mbox, and, thankfully, it's noise free.
 
DoogieDown1 said:
Do you have a USB audio interface/mic pre that you can try out? That may help narrow the problem down a bit.
Click to expand...

Yes. I've got a Digidesign Mbox, and, thankfully, it's noise free.
Click to expand...


Hmmmm....

I wonder if something didn't happen with your sound card. You might try moving it to a different slot. If it's noise-free in a different slot, the original slot gave up the ghost on you.
 
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