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Showing results for tags 'interference'.
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Anyone find RF Hash/interference with SD 633?I've been following the 633 threads but haven't come across any comments about whether it throws any radio interference into your wirelesses. I would think not, since it doesn't have a hard drive, but I thought I'd ask... Any Comments? Cheers, Brent Calkin
Comtek interference caused by Kinoflo?
Blas Kisic posted a topic in EquipmentI had an interesting issue crop up a few days ago. I have two Comtek feeds: one for my crew and one for Production (which includes Director & Scripty, as well as agency types in VV.) Transmitters are two BST-25 216. So I was working on a commercial shoot in a home. My cart ended up in a corner in the kitchen, and I installed my two Mini-Mite antennas upside down so as not to hit the ceiling. Everything was tested, no problems found. At some point, a four-foot Kino fixture with four bulbs was put next to the car, vertically. It was connected to a Variac dimmer, at what I would call minimal intensity. After all adjustments were made, the light ended up about one foot from the Mini-Mite, directly in the path to where Director and Scripty were seated, some 25' away. Eventually (don't know the timeframe, it was a pretty busy and tense set) we heard that the signal is "cutting out". My boom op checked and, indeed, it was cutting in and out intermittently. We moved the cart to get a clear line of sight to them and it mostly was resolved. Unfortunately, we were short on time and dealing with a difficult shoot, so there wasn't much time to test and troubleshoot properly, so I can't share any more information - but I'd love to hear comments or experiences from my colleagues, in case the issue crops up again. TIA, BK
WJJZ1069 posted a topic in Cameras... love them, hate themSo I've been driving myself crazy lately with an audio issue that's really not an issue. I work with the same C300 very often, and I've been noticing some strange interference just recently. I notice it during sit down interviews when I listen to the camera return...I hear little blips like digital crickets. the thing is, audio from the mixer is clean, so it's not the mics picking up interference. I've swapped out my cables and breakaways to the camera, so it's probably not them. Every so often I just start hearing these blips, very very softly in the background. It's not something you would notice unless you're listening for it, but I hear it loud and clear now. This problem also doesn't occur on other C300's (not that I've seen yet). I also know it's not the return cable picking up interference because the crickets are on the recorded clip (I've attached that below). The clip is room tone with the chirps on it from the last shoot. Any ideas? Thanks all! AA279501.MXF
Help identifying interference (sample included)!I'm doing a reality show at the moment and am sometimes getting this strange interference on wireless. The wireless in question is a Sennheiser 2000 series with a DPA d:screet 4060 mic going into a Nomad. Like you can hear from the sample, it is a quiet pulse not too far from a digital "phone ring" sound. Now I want to ask if anyone might recognize what it is? I'm guessing it might be 4G or 3G phone interference or some other type of interference from a smartphone bleeding into the signal? If it is, then I suppose I'm S.O.L. since the talents of the show are on their phones all the time. Luckily the interference is not worse than that. interference.wav
Something every SD788 and Lectro owner should know...
Sound Art Film posted a topic in EquipmentHi all, I have been having issues with my Lectro units when working with my 788. The problem arises when my lectros are connected via XLR inputs on the 788. The difference in available frequencies is dramatic when the 788 is turned on and my units are connected via XLR to the 788. When the 788 is on and I scan with my lectros, and without being connected to the 788, I get minimal RF spray, even when the units are right next to the input section. After doing some investigation I came across this page on SD's website: http://www.sounddevices.com/notes/recorders/788/788t-w-wireless-in-38-40/ I inspected my XLR's from 411a to 788 and discovered that the ground pin had not been connected to the housing of the connector. Also, I inspected my Y cable for my SRB5p and noticed that the ground pins had not been connected to the housing either. After doing the modification to the XLR, my available frequencies improved quite a bit for the 411. However, even after doing the mod for the Y cable for the Srb5p, I got no better results. my theory is that the shield in the thin cables is not sufficient to help block the RF interference no matter what. At this point, I remembered reading that the RF leakage was much less using the TA3 inputs on the 788. After soldering two new cables to go from the TA3s from the SRB to the input of the 788, I discovered that I had much more available frequencies on the Srb5p. Case in point: It appears from my testing that if you are going to use Lectrosonics receivers with the 788 and route through the XLR input, make sure your XLR, on the male end, has the ground pin attached to the housing of the connector. If possible, it appears the TA3s have a lot less RF problems than the XLRs and are a good choice to choose for routing Lectro units into the 788. My setup 788: All channels activated and routed to tracks. Powered by Sony NP-970 L mount battery. Lectrosonics 411a and Srb59: 411: Block 22, Srb5p Block 20. 411 powered by two 9V lithium batteries. Srb5p powered by L mount battery. XLR: 12" Y cable: Made by Pro-Sound as Y cable for ta5f, terminated with two XLR male. 12" Pictures and examples below: Units scanned with 788 off and not connected Units scanned with 788 on, not connected. Units scanned, connected via XLR inputs on 788, 788 on. Units scanned, connected via XLR with ground pin connected to connector housing. (notice difference on 411, but not on Srb5p) Units scanned, modded XLR connected to 788 and 411, modded Y cable connected to 788, but not connected to Srb5p, 788 on. Srb5p scanned, Y cable attached to 788 via XLR, no 411, 788 on.