Michael McQueen Posted December 23, 2011 Report Share Posted December 23, 2011 so I was requested by Rado to do a test of frequency scans on block 21 with my Nomad on and off, I did the same with block 24. Bloc 24 with Nomad powered off Block 24 with Nomad powered up Block 21 with Nomad powered off Block 21 with Nomad powered on nothing special done with this test. bag was sitting on my kitchen counter, Nomad switch off, turned on BDS and powered up receivers and did a scan. Then turned on Nomad and re-scanned. Looks to be some RF in block 21 after the power up. Not sure if Glenn has anything scientific for this. My SRa's are fairly close to the unit as you can tell from the photos and i could move them away by a good inch or so. But honestly, I haven't had any dropouts from general usage, even while being in NYC last week, which was quite the ugly scan. Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted December 23, 2011 Report Share Posted December 23, 2011 Thanks Mike for following through with my request.... Can you try to see how far away from the Nomad the RF spray disappears?? Quote Link to comment Share on other sites More sharing options...
jason porter Posted December 23, 2011 Report Share Posted December 23, 2011 Thanks for doing this test. As we can all see, real world testing can be invaluable. Does anyone have a Nomad and 411's to see if they are more immune to whatever the Nomad is putting out? Could the scans be seeing something else NOT coming from Nomad? Quote Link to comment Share on other sites More sharing options...
JDirckze Posted December 24, 2011 Report Share Posted December 24, 2011 It would also be interesting to see similar scans with UCR411's. I stopped using my SRa in the bag and swapped it out with 411's because the SRa was affected more than the 411's by RF spray... Quote Link to comment Share on other sites More sharing options...
Philip Perkins Posted December 24, 2011 Report Share Posted December 24, 2011 Whoa, nothing else on in the bag? Are the SRas and the Nomad being powered by the same battery feed? Any RF filters in that feed? If so, what happens when you power the SRas on a separate battery or power supply, in that same position? I see that the RX is positioned over the Nomad's meter--does the spray change if the RX is positioned over the other end (left) of the recorder? The Zaxnet aspect of your Nomad wasn't fired up, was it? thanks for the tests dude! phil p Quote Link to comment Share on other sites More sharing options...
soundslikejustin Posted December 24, 2011 Report Share Posted December 24, 2011 Two mins ago there was a post here from Jack Norflus with block scans using 411's...where'd it go? Quote Link to comment Share on other sites More sharing options...
Jack Norflus Posted December 24, 2011 Report Share Posted December 24, 2011 411's block 25 and 26 with Nomad off and on: Quote Link to comment Share on other sites More sharing options...
Jack Norflus Posted December 24, 2011 Report Share Posted December 24, 2011 Two mins ago there was a post here from Jack Norflus with block scans using 411's...where'd it go? Images were too large wanted to resize them Quote Link to comment Share on other sites More sharing options...
jason porter Posted December 24, 2011 Report Share Posted December 24, 2011 Thanks for those scans, Jack. That looks much more hopeful! Quote Link to comment Share on other sites More sharing options...
JDirckze Posted December 24, 2011 Report Share Posted December 24, 2011 Yes, thanks Jack! I have a feeling there would be a vast improvement on the amount of RF spray across the SRa if it were moved to the outer pockets on a Petrol bag. Quote Link to comment Share on other sites More sharing options...
MatthewFreedAudio Posted December 24, 2011 Report Share Posted December 24, 2011 How are scans on a Zaxcom Rx looking with the Nomad? Similar RF spray? Different? Quote Link to comment Share on other sites More sharing options...
Michael McQueen Posted December 24, 2011 Author Report Share Posted December 24, 2011 I'll redo some more testing in the coming days. Didn't have much time to mess with it today. Rescan with: Sra's own power Own power moved more way from bag(how far to get clean scan) Bag power but out of bag and how far to get clean scan And I'd be interested in what zax rx's are getting too. Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted December 24, 2011 Report Share Posted December 24, 2011 I feel that block 21 "unfortunately my block of choice" is affected by recording devices even 552.. Mike please try sra outside the bag with separate power. Quote Link to comment Share on other sites More sharing options...
justanross Posted December 24, 2011 Report Share Posted December 24, 2011 Alright. I'm just gonna ask because I don't understand. Why would a recorder affect RF? What is in it that causes this issue? Quote Link to comment Share on other sites More sharing options...
Chase Yeremian Posted December 24, 2011 Report Share Posted December 24, 2011 Alright. I'm just gonna ask because I don't understand. Why would a recorder affect RF? What is in it that causes this issue? Just about every peice of electronics can potential cause RFI. It's just when electricity is passing through any medium it creates a electromagnetic field. Even though it is relatively very weak in high end recorders, the use of highly sensitive receivers used right next to any source of RFI will probably show it. When you hear about recorders with internal HDD's having relatively more RFI than solid state recorders it is likely because the electric motor that spins the platter in the HDD is actually using a magnetic field to make the platter spin, thus emitting more RF than a recorder that didn't have to spin up a little electric motor. Quote Link to comment Share on other sites More sharing options...
Christian Spaeth Posted December 24, 2011 Report Share Posted December 24, 2011 Uh-oh. I'll be using block 21 SRas in the bag too. Quote Link to comment Share on other sites More sharing options...
glenn Posted December 24, 2011 Report Share Posted December 24, 2011 All digital mixers and recorders use internal RF frequency signals to move data within the unit. It is the RF energy created by these signals that causes interference when the RF energy is allowed to radiate either from the case itself or from cables pluged into the case. Zaxcoms Nomad case design and its connections to external cables are all designed with RF supression in mind. And we have no complaints of any excessive RF radiation to date. The best thing that anyone can do is to seperate any digital product from receiver antennas by as great a distance as possible. Even 6 inches can be a big help over nothing. The Zaxnet 2.4 GHz signal has a high pass filter so interference to UHF radios is very unlikely. Glenn Quote Link to comment Share on other sites More sharing options...
soundslikejustin Posted December 24, 2011 Report Share Posted December 24, 2011 The Zaxnet 2.4 GHz signal has a high pass filter so interference to UHF radios is very unlikely. Glenn This is good to know. Does the IFB option in the QRX have this high pass filter as well? Quote Link to comment Share on other sites More sharing options...
berniebeaudry Posted December 24, 2011 Report Share Posted December 24, 2011 All digital mixers and recorders use internal RF frequency signals to move data within the unit. It is the RF energy created by these signals that causes interference when the RF energy is allowed to radiate either from the case itself or from cables pluged into the case. Zaxcoms Nomad case design and its connections to external cables are all designed with RF supression in mind. And we have no complaints of any excessive RF radiation to date. The best thing that anyone can do is to seperate any digital product from receiver antennas by as great a distance as possible. Even 6 inches can be a big help over nothing. The Zaxnet 2.4 GHz signal has a high pass filter so interference to UHF radios is very unlikely. Glenn Glenn, I sent you a PM on this forum and the Zaxcom forum. Please read and then call me on my cell: 651-470-1637 I saw very little rf spray into my Lectro 211's by the way. There was some but nothing that was a problem. Quote Link to comment Share on other sites More sharing options...
justanross Posted December 24, 2011 Report Share Posted December 24, 2011 Just about every peice of electronics can potential cause RFI. It's just when electricity is passing through any medium it creates a electromagnetic field. Even though it is relatively very weak in high end recorders, the use of highly sensitive receivers used right next to any source of RFI will probably show it. When you hear about recorders with internal HDD's having relatively more RFI than solid state recorders it is likely because the electric motor that spins the platter in the HDD is actually using a magnetic field to make the platter spin, thus emitting more RF than a recorder that didn't have to spin up a little electric motor. Thank you. It all makes sense to me now. Quote Link to comment Share on other sites More sharing options...
Philip Perkins Posted December 24, 2011 Report Share Posted December 24, 2011 411's block 25 and 26 with Nomad off and on: Can you tell us about how you are powering your RX and Nomad? Do they share a feed/battery? Did how you routed the DC ables make a diff? phil p Quote Link to comment Share on other sites More sharing options...
Jack Norflus Posted December 24, 2011 Report Share Posted December 24, 2011 Can you tell us about how you are powering your RX and Nomad? Do they share a feed/battery? Did how you routed the DC ables make a diff? phil p 411's and Nomad are both being powered from a communal NP1. No special filtration. Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted December 24, 2011 Report Share Posted December 24, 2011 Looks very similar to my 552 and 21 Block SRas. I dont mind leaving my Sras out of the bag but an antenna distro should be a better solution. When the PSC RF multi SMa is released. 411's block 25 and 26 with Nomad off and on: Quote Link to comment Share on other sites More sharing options...
Jack Norflus Posted December 25, 2011 Report Share Posted December 25, 2011 So just curious regarding spray from any piece of gear - in the real world how much affect does a pixel or two or three or even four have on the range of a 411? Quote Link to comment Share on other sites More sharing options...
Philip Perkins Posted December 25, 2011 Report Share Posted December 25, 2011 411's and Nomad are both being powered from a communal NP1. No special filtration. Thanks-- I was asking the OP actually--since he's using SRa w/o tracking front end etc. phil p Quote Link to comment Share on other sites More sharing options...
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