Rainier Davenport Posted October 8, 2012 Report Share Posted October 8, 2012 I have the older CMC5 Schoeps 48V pre amps which are not shielded for RF interference, and my Tech Guy made me this fantastic Header Cable which virtually eliminated all RF interference. I need to make another header cable, but my Tech Guy has retired and I would have to destroy the header cable I'm using to see how he constructed it. My limited understanding is that the header cable somehow uses Resisters (could be wrong!) and a connection with the XLR plug case which connects with the case of the preamp to reduce the RF interference. Someone described using Switchcraft plugs as they had a better connection? The current Header Cable does not use Switchcraft plugs. I have tried to search the forum, but I have not returned any results as I am sure there was a post about this topic earlier that described how to make this Header Cable, or if any kind persons would describe how to make it again I would be very grateful. I intend to send the Preamps back to Schoeps one day to have them modified, but I require this Header Cable work around due to budget restrictions. Quote Link to comment Share on other sites More sharing options...
ccsnd Posted October 8, 2012 Report Share Posted October 8, 2012 http://www.neutrik.us/en-us/xlr/emc-series/nc3fxx-emc-b Quote Link to comment Share on other sites More sharing options...
Jack Norflus Posted October 8, 2012 Report Share Posted October 8, 2012 Did he use neutrik emc XLR's? Quote Link to comment Share on other sites More sharing options...
Marc Wielage Posted October 8, 2012 Report Share Posted October 8, 2012 There is the Neutrik EMC anti-RF connector, but I dunno how much RF interference is actually picked up by the capsule or preamp itself. I think the Ferrite Beads and capacitor do most of the work. http://www.neutrik.c...ors/emc-series/ Doh! The soundguy beat me by 2 minutes! Quote Link to comment Share on other sites More sharing options...
Eric Toline Posted October 8, 2012 Report Share Posted October 8, 2012 The correct Neutrik connectors are the NC3FXX-EMC and the NC3MXX-EMC. I made some mic cables for Ty Ford using those connectors with Canare Star Quad. While a PITA to wire they eliminated every trace of any type of RF issues he was having. You cannot just make a short jumper cable with those connectors and use it in line with the mic feed to the mixer. You must have it as the only line between the mic and the mixer. Eric Quote Link to comment Share on other sites More sharing options...
Rainier Davenport Posted October 8, 2012 Author Report Share Posted October 8, 2012 I recall him describing some kind of electrical component and 'Capacitors' sound much more accurate than my memory of 'Resistors'. This diagram also uses the contact with the connector shell which is another aspect I recall him telling me about. He certainly did not mention 'The Neutrik EMC anti-RF connector' as part of what he made. Thanks for your replies so far this is a good start! Quote Link to comment Share on other sites More sharing options...
graham Posted October 8, 2012 Report Share Posted October 8, 2012 Hey Eric, Would those connectors work for a wireless boom setup? You had said to mixer so I'm just double checking Quote Link to comment Share on other sites More sharing options...
Eric Toline Posted October 8, 2012 Report Share Posted October 8, 2012 Hey Eric, Would those connectors work for a wireless boom setup? You had said to mixer so I'm just double checking I doubt it as the feed from mic to mixer has to be unbroken by anything in series with the cable. A wireless tx will break the feed and the RF can & will leak into the line at the in & out connections of the tx. Eric Quote Link to comment Share on other sites More sharing options...
Eric Toline Posted October 8, 2012 Report Share Posted October 8, 2012 I recall him describing some kind of electrical component and 'Capacitors' sound much more accurate than my memory of 'Resistors'. This diagram also uses the contact with the connector shell which is another aspect I recall him telling me about. He certainly did not mention 'The Neutrik EMC anti-RF connector' as part of what he made. Thanks for your replies so far this is a good start! That's because I swore him to secrecy on a blood oath ;-)) Eric Quote Link to comment Share on other sites More sharing options...
Nate C Posted October 8, 2012 Report Share Posted October 8, 2012 The NC3FXX-EMC come with the Ambient phantom power supply (http://www.ambient.de/produkte/ambient-recording/mikrofonspeisung/ump-ii.html) I have never had any Rf issues using this system. All said I am using Lectro SMa/um4ooa and Schoeps Cmit/641 in this configuration. Quote Link to comment Share on other sites More sharing options...
VASI Posted October 12, 2012 Report Share Posted October 12, 2012 Eric Toline: Star Quad L-4E6S or L-4E5C? Quote Link to comment Share on other sites More sharing options...
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