Michael Capulli Posted February 11, 2011 Report Share Posted February 11, 2011 can anybody explain this phenomenon? Attaching 744T to same power source giving me worse range on 200 Lectros. Quote Link to comment Share on other sites More sharing options...
ProSound Posted February 11, 2011 Report Share Posted February 11, 2011 It is well documented that you will get RF spray to cut down on it do the following: Power 744T via its own Np1 cup and battery Put mixer between 744T and wireless Move wireless to outside of bag if possible Quote Link to comment Share on other sites More sharing options...
RPSharman Posted February 11, 2011 Report Share Posted February 11, 2011 I just happen to be on JWSound at the very moment you posted this (shocker), so I guess I'll jump in before everyone else. There are lots of threads which include information about RF from recorders, specifically the 744T. A little search will yield lots of results. As for explaining "the phenomenon", I'll let the resident physicist and/or master of stating the obvious chime in........... Quote Link to comment Share on other sites More sharing options...
Michael Capulli Posted February 11, 2011 Author Report Share Posted February 11, 2011 I knew about the spray but I never noticed it was worse through the power circuit. Quote Link to comment Share on other sites More sharing options...
Jim Feeley Posted February 11, 2011 Report Share Posted February 11, 2011 Michael, this Sound Devices tech note has some relevant info: RF Emissions and the 702, 722, and 744T Recorders http://www.sounddevices.com/notes/recorders/7-series-rf/ Specifically the bit on conducted RF. From the Quick Tips section of the tech note: "Make certain that RF is not being conducted through power cables. The 702, 722, and 744T recorders emit low levels of RF energy through the power cable. One way to determine if this is causing interference problems is to power the recorder and wireless from their own individual power sources and note any change in performance. Power problems can be remedied by battery powering either the recorder or receivers. If a single power source is powering recorders and receivers wrap several turns of the recorder’s power cord through a ferrite toroid and wrap the power cord for the receivers through their own toroids." Good luck, Jim Quote Link to comment Share on other sites More sharing options...
Derek H Posted February 11, 2011 Report Share Posted February 11, 2011 I wonder if the effect is less severe if using a solid state disk.. Quote Link to comment Share on other sites More sharing options...
Philip Perkins Posted February 11, 2011 Report Share Posted February 11, 2011 Once more: easy fixes include NOT powering the 744 off the same source as the RX (consider running the 744 on an internal batt) and putting some distance and maybe the mixer between the RX and the recorder. For me, that has calmed the spray down to workable levels on my RX, and I have RX in many diff. blocks.... phil p Quote Link to comment Share on other sites More sharing options...
gpiegari Posted February 11, 2011 Report Share Posted February 11, 2011 As I've heard it explained, RF is from the processor and electrical architecture. You could even pull the HD and only record onto CF and find the same results. I swapped an SSD into my 744t. No difference in RF spray, however the unit is now dead quite, boots faster, and runs a little cooler. As others have said, reducing RF is all about proximity and isolation. Glen Piegari I wonder if the effect is less severe if using a solid state disk.. Quote Link to comment Share on other sites More sharing options...
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