Rob Beal Posted October 17, 2011 Report Share Posted October 17, 2011 I just bought a new Kata bag to replace this one, and as soon as I get some downtime my plan is to take it to a professional seamstress and have the cobaltex sewn into the section of the bag that holds the ZFR100. Quote Link to comment Share on other sites More sharing options...
Derek H Posted October 17, 2011 Report Share Posted October 17, 2011 I think I may follow your lead on this one rob. The only trouble is that I like to use the ifb feature of the trx900aa and completely covering the unit in this material will kill that signal as well. Any issues with having a conductive surface touching all the connectors and parts of the zfr? On my sta150 all the connectors, including the DC input, seem to share a common ground anyway. Quote Link to comment Share on other sites More sharing options...
Karri Posted October 17, 2011 Report Share Posted October 17, 2011 Hmm, might wrapping an rf-sensitive microphone with this stuff help? Never actually had an rf problem to this date, but you never know.. Quote Link to comment Share on other sites More sharing options...
Rob Beal Posted October 17, 2011 Report Share Posted October 17, 2011 Haven't noticed any ill effects on the ZFR... I monitor the return from it regularly and don't hear any grounding problems. I imagine this solution would be less useful for people using the TRX900 as you wouldn't want to stifle your camera hop, but you could at least wrap the body of the unit and leave the antenna free. That way you'd reduce the RF spray from the recorder itself and leave the antenna free to transmit. Worth a try anyway. Quote Link to comment Share on other sites More sharing options...
pvanstry Posted April 12, 2012 Report Share Posted April 12, 2012 I run a 788T/CL8 in the bag with 4 SRa. I have been wondering about possible rf spray from the 788 and also the sensitivity of the SRa to it. THe SRa being so small and meant for slot use is telling me that it could be more sensitive to this. The question ( and it might help Derek H here ) is should i wrap the 788 or wrap the SRa in the fabric? Thanks Quote Link to comment Share on other sites More sharing options...
jason porter Posted April 12, 2012 Report Share Posted April 12, 2012 Definitely wrap the recorder. The receiver actually uses the body/case as a ground plane, so I would assume that blocking the RF getting to it would be bad. The question ( and it might help Derek H here ) is should i wrap the 788 or wrap the SRa in the fabric? Thanks Quote Link to comment Share on other sites More sharing options...
pvanstry Posted April 12, 2012 Report Share Posted April 12, 2012 I just spoke with a guy at the vendor, he was saying that also ( wrap the recorder ). He was also saying that a simple partition in between the recorder and the receivers might work but that i should use a material called Cobaltex ( reflective RF material ) with an absorptive RF material so that the RF would not potentially damage the recorder. But he was saying that it could be the case but not really sure and if it was not completely wrap that it could be used without the absorptive material. THe way i use my equipment, is starting from me: 788, CL8, SRa,LMa ( hop tx ). So i bought of using the 788-CL8 gap to drop in a partition of metrical in between the 788 and CL8 using them to hold the fabric. Might try it. Thanks Quote Link to comment Share on other sites More sharing options...
LarryF Posted April 12, 2012 Report Share Posted April 12, 2012 The entry for RF into the SRa is the antennas. Wrapping the antennas in absorptive material will indeed reduce the interference pickup but it will reduce the desired signals as well. Turning the SRa off, would essentially do the same thing. Best, Larry F Lectro I run a 788T/CL8 in the bag with 4 SRa. I have been wondering about possible rf spray from the 788 and also the sensitivity of the SRa to it. THe SRa being so small and meant for slot use is telling me that it could be more sensitive to this. The question ( and it might help Derek H here ) is should i wrap the 788 or wrap the SRa in the fabric? Thanks Quote Link to comment Share on other sites More sharing options...
pvanstry Posted April 12, 2012 Report Share Posted April 12, 2012 Thanks Larry. I ordered some of the material and will do a partition in between my 788 and my SRA will see. Quote Link to comment Share on other sites More sharing options...
Marc Hoppe Posted April 12, 2012 Report Share Posted April 12, 2012 I just tried the Cobaltex with my 744t and 411a's (Blocks 19 and 21). I seemed to be getting a lot of RF spray from the recorder, which was separated from the receivers by a Petrol divider. Wrapping the 744t in the Cobaltex helped, but only slightly. I now have moved the receiver to the outside pockets of the bag and kept the wrap around the recorder. It has given me much less RF spray, but I don't like how wide of a footprint my bag has now. I tried to swap the mixer and recorder and have the recorder against my chest, 744 in the middle, and then the receivers, but the width of the bag didn't allow that with the connections on both sides of the 442. Marc Quote Link to comment Share on other sites More sharing options...
resonate Posted February 14, 2013 Report Share Posted February 14, 2013 I am getting a lot of RF noise on my micron receivers as soon as i turn the Tascam DR-680 on (it's basically white noise). I tried to move them up to my harness, and that worked good, so i am thinking now of a way to absorb the rf spray from the recorder. Is wrapping around the recorder with absorption material a good idea? Still looking for distrubutor of this materials in Europe. Quote Link to comment Share on other sites More sharing options...
dudsound Posted February 14, 2013 Report Share Posted February 14, 2013 I am getting a lot of RF noise on my micron receivers as soon as i turn the Tascam DR-680 on (it's basically white noise). I tried to move them up to my harness, and that worked good, so i am thinking now of a way to absorb the rf spray from the recorder. This solution to a similar problem on the Sound Devices website could possibly be applied to your setup. http://www.sounddevices.com/notes/recorders/788/788t-w-wireless-in-38-40/ Quote Link to comment Share on other sites More sharing options...
resonate Posted February 15, 2013 Report Share Posted February 15, 2013 Unfortunately my Micron cable (2Aocph-HR4) for two receivers, powered by NP1 is already wired the way Sound Devices recommends. Anyway i have this problem with or without the NP1 Hawkwoods power splitter, and without any cables connected to the recorder. The moment i turn the tascam on, i get white noise on SD 442's channels. If the tascam is off, problem goes away. My wireless are in 840-864 range. The only thing that works is put them on my shoulders strapped to my harness. I have to get an extender cable to power them up ,though. Quote Link to comment Share on other sites More sharing options...
Max Hirtenstein Posted April 20, 2013 Report Share Posted April 20, 2013 anybody have any success with cobaltex recently? 4 layers of it between my nomad and SRa does nothing. Quote Link to comment Share on other sites More sharing options...
Alan H. Chang Posted April 20, 2013 Report Share Posted April 20, 2013 anybody have any success with cobaltex recently? 4 layers of it between my nomad and SRa does nothing. Hey Max, Just remembered, have you tried powering your SRa separately from your Nomad? Looks like it's affecting all our blocks. Quote Link to comment Share on other sites More sharing options...
Max Hirtenstein Posted April 20, 2013 Report Share Posted April 20, 2013 Hey Max, Just remembered, have you tried powering your SRa separately from your Nomad? Looks like it's affecting all our blocks. yep, i've tried internal batteries on the nomad and using the SRa battsled. no difference... Quote Link to comment Share on other sites More sharing options...
studiomprd Posted April 20, 2013 Report Share Posted April 20, 2013 guess you still haven't solved the issue to your satisfaction... as to the RF material, does increasing the spacing of the units help ?? typically the material acts like a bit of additional spacing... Quote Link to comment Share on other sites More sharing options...
Max Hirtenstein Posted April 20, 2013 Report Share Posted April 20, 2013 guess you still haven't solved the issue to your satisfaction... as to the RF material, does increasing the spacing of the units help ?? typically the material acts like a bit of additional spacing... haha yes well i'm looking for a workaround until both the Nomad and SRa are headed back to their respective HQ's for upgrades. HAT prevails. moving it further from the Nomad's hirose power jack helps slightly, but there's only so far you can space things in a bag. Quote Link to comment Share on other sites More sharing options...
studiomprd Posted April 20, 2013 Report Share Posted April 20, 2013 " moving it further from the Nomad's hirose power jack helps slightly, " try concentrating the fabric coverage in that area, and perhaps grounding the fabric Quote Link to comment Share on other sites More sharing options...
Max Hirtenstein Posted April 20, 2013 Report Share Posted April 20, 2013 and perhaps grounding the fabric ? i also have a ferrite choke on the power cable but to no effect. Quote Link to comment Share on other sites More sharing options...
jrd456 Posted April 20, 2013 Report Share Posted April 20, 2013 Mumetal probably would do it,but it's expensive. J.D. Quote Link to comment Share on other sites More sharing options...
Jack Norflus Posted April 20, 2013 Report Share Posted April 20, 2013 moving it further from the Nomad's hirose power jack helps slightly, but there's only so far you can space things in a bag. Max The mod that Zaxcom has for the RF spill on the power connector will greatly reduce your RF spill. Quote Link to comment Share on other sites More sharing options...
Philip Perkins Posted April 20, 2013 Report Share Posted April 20, 2013 I'm able to reduce RF from a 744 to 411s in a very small and crowded bag by a visible but not huge amount with 4 layers of the RF cloth on top of the recorder. I have not wrapped the bottom (no receivers in that direction), and the cloth on the top is not attached to the recorder (heat). philp Quote Link to comment Share on other sites More sharing options...
inaudible distortion Posted August 31, 2014 Report Share Posted August 31, 2014 Could anyone achieve good results with cobaltex so far? I'm building a DIY bag these weeks and I'm looking for a RF shielding material to even put on the Receivers side of my Recorder or to build a small wall out of it, between Recorder and the Receivers. What do you think is better? I found an interesting material produced just 50 miles away from me. Its called "swiss shield naturelle", could that be something? I'll try to get a piece and will report back... Quote Link to comment Share on other sites More sharing options...
Philip Perkins Posted August 31, 2014 Report Share Posted August 31, 2014 That is the material I used in my 744 bag. There is an improvement but it is small and still dependant on what freq block your receivers are in. Higher # blocks are usually better. philp Quote Link to comment Share on other sites More sharing options...
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