RadoStefanov Posted September 13, 2013 Report Share Posted September 13, 2013 Just got the new thin cable DPA 4063. It has RF problems with digital zaxcom Trx900la. I have old 4063s with the old thicker cable and they are all fine. Anybody else having a similar issue? Quote Link to comment Share on other sites More sharing options...
Mark Orusa Posted September 13, 2013 Report Share Posted September 13, 2013 Do you have the 2k filter turned on in the transmitter? I get some noise from ZaxNet when I hold the mic near my Nomad. Is there still noise when no other rf devices are powered on? Is the noise you're experiencing worse when the cable is coiled near the tx? Are you sure the Lemo connector is properly terminated? I guess it's pretty obvious when the shell is not grounded, so I'm just checking. Mark O. Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted September 13, 2013 Author Report Share Posted September 13, 2013 Do you have the 2k filter turned on in the transmitter? I get some noise from ZaxNet when I hold the mic near my Nomad. Is there still noise when no other rf devices are powered on? Is the noise you're experiencing worse when the cable is coiled near the tx? Are you sure the Lemo connector is properly terminated? I guess it's pretty obvious when the shell is not grounded, so I'm just checking. Mark O. Thanks mark. Don't have the 2k on. The rf comes in different frequencies. Cable is coiled away from the tx. One of the usual suspects wired the mic and even though I required push pull lemo I got the threaded one. No way to check... Quote Link to comment Share on other sites More sharing options...
greg sextro Posted September 13, 2013 Report Share Posted September 13, 2013 yep - i've had problems with signal noise from a new 4063 wired by one of the usual suspects. same with an older 4063 (thicker wire)...so, don't know what to tell you except that I generally stick to cos-11s with zax transmitters... Quote Link to comment Share on other sites More sharing options...
soundtrane Posted September 13, 2013 Report Share Posted September 13, 2013 <so, don't know what to tell you except that I generally stick to cos-11s with zax transmitters...> which is a great limitation - especially since i feel the DPA lavs are superior to the COS11 and i do want to use them, while looking at zaxcom RF products to get before december... -vin Quote Link to comment Share on other sites More sharing options...
rich Posted September 13, 2013 Report Share Posted September 13, 2013 hmm. i have some new 4063's coming to me imminently, which i will wire myself. will let you know how i get on. though as i recall, before i properly grounded all my mics, i could sometimes get rf in the mic if the cable was positioned too close to the antenna. since grounding pin 1 to the shell, this hasnt been a problem. you can check if the mic is shielded properly with a voltmeter that has a continuity checker. touch one probe to the pins in the connector, and one to the shell. it should beep. Quote Link to comment Share on other sites More sharing options...
John Blankenship Posted September 13, 2013 Report Share Posted September 13, 2013 I recently bought two DPA 4063 lavs from one of the well-respected "usual suspects" and both had RF noise issues with Zaxcom transmitters, both a TRX900 and a TRX900LANC. They wired another and sent it (this time it had a push-pull connector) and it, too, had RF issues. I gave up. Ironically, I have a couple of DPA 4061 lavs that work fine with my Zaxcom transmitters. So, it appears that, along the lines of what Rado said, maybe DPA has changed something. Quote Link to comment Share on other sites More sharing options...
studiomprd Posted September 13, 2013 Report Share Posted September 13, 2013 "Anybody else having a similar issue? " I believe so... " maybe DPA has changed something. " like the cable ?? Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted September 13, 2013 Author Report Share Posted September 13, 2013 "Anybody else having a similar issue? " I believe so... " maybe DPA has changed something. " like the cable ?? The cable is so thin i would not be surprised if the shielding is not sufficient. Quote Link to comment Share on other sites More sharing options...
rich Posted September 13, 2013 Report Share Posted September 13, 2013 given that the 4063 was made by DPA for transmitters like Zaxcom's that put out less than the 5v that the 4061 requires to work optimally, perhaps you can see why there is some surprise that the updated version has changed something to the detriment of its current users. Quote Link to comment Share on other sites More sharing options...
studiomprd Posted September 13, 2013 Report Share Posted September 13, 2013 " why there is some surprise " what Rado said... " made by DPA for transmitters like Zaxcom's " there are lots like that besides Zaxcom's... Quote Link to comment Share on other sites More sharing options...
Andy P Posted September 15, 2013 Report Share Posted September 15, 2013 Yep I can confirm rf problems here. 463 #LO6645. The newest one I had previous to that one is #LO6023, and its fine. I sent this one back to be rewired but its still having interference. It's worst when the cable is coiled next to the transmitter body as opposed to the aerial. The cable looks to be the same thickness though. I'll get in touch with the UK distributers tomorrow. Quote Link to comment Share on other sites More sharing options...
Wandering Ear Posted September 15, 2013 Report Share Posted September 15, 2013 I had major RF problems with the first 4063 I got, to the unusable point, my dealer got another batch in and they sounded clean so they swapped it out. Sometimes it seems like I have a bit of extra noise caused by RF, but it's slight and not a problem. I would like to use DPA more because I like the sound better, but I am hesitant to buy more at the moment. Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted September 15, 2013 Author Report Share Posted September 15, 2013 I heard cellphone interference in my latest test. I was getting a SMS and my phone was 2 yards away.... Quote Link to comment Share on other sites More sharing options...
Jeff Wexler Posted September 16, 2013 Report Share Posted September 16, 2013 Ryan at Trew Audio Los Angeles is in conversation with DPA over this issue. I'm freaking out because all my gear is on its way to Hawaii so I can't check anything. I have 2 new DPA 4063 ser. no. L06653 and L06652, both dangerously close to the L06645 Andy P has stated. I'm confident this will get sorted out between DPA and Trew Audio but I have no idea what the "fix" will be --- probably a return of these mics and some re-working of the current model before we can be back to the wonderful sounding trouble free mic I rely on. Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted September 16, 2013 Author Report Share Posted September 16, 2013 Mine is l06659 Jeff your mics are in between... Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted September 16, 2013 Author Report Share Posted September 16, 2013 Somebody should check the wiring. I know trew connects pin 1 to the shell . It is possible the shell should be connected only to the ground wire... Quote Link to comment Share on other sites More sharing options...
studiomprd Posted September 16, 2013 Report Share Posted September 16, 2013 "I'm freaking out " maybe you could get production pushed a couple weeks..? Quote Link to comment Share on other sites More sharing options...
rich Posted September 16, 2013 Report Share Posted September 16, 2013 Somebody should check the wiring. I know trew connects pin 1 to the shell . It is possible the shell should be connected only to the ground wire... tried that when i first was getting to grips with wiring the zaxcoms. zaxcom said NO. shell and pin 1 must be connected to mic ground wire to prevent rf issues. Quote Link to comment Share on other sites More sharing options...
studiomprd Posted September 16, 2013 Report Share Posted September 16, 2013 " It is possible the shell should be connected only to the ground wire... " ? or " shell and pin 1 must be connected to mic ground wire " ? great discussion... but who actually knows ? Quote Link to comment Share on other sites More sharing options...
Wandering Ear Posted September 16, 2013 Report Share Posted September 16, 2013 Both of mine are wired with pin 1 connected to shell. The first one I got which had the issue is serial # L06613 The one I got it replaced with which doesn't is serial # L06481 Quote Link to comment Share on other sites More sharing options...
Jeff Wexler Posted September 16, 2013 Report Share Posted September 16, 2013 Somebody should check the wiring. I know trew connects pin 1 to the shell . It is possible the shell should be connected only to the ground wire... Rado, when I was at Trew Audio this morning they had been following the topic (here) but nothing had really been determined yet. Ryan did have lengthy conversation with DPA people who did keep asking about how things are wired. All of my DPA 4063 mics have been wired properly at Coffey Sound (now Trew Audio) so I don't think wiring is the issue here. Ryan is also aware that you got your mics from Trew and they are confident that the wiring is proper. Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted September 16, 2013 Author Report Share Posted September 16, 2013 Jeff, I am just exploring all angles... Quote Link to comment Share on other sites More sharing options...
Wandering Ear Posted September 25, 2013 Report Share Posted September 25, 2013 Jeff, or anyone else, have you heard anything new from DPA? The lav I have that I thought was clean, picked up interference on set the other day. Now I don't feel comfortable using it until this gets sorted out. Quote Link to comment Share on other sites More sharing options...
Ryan Coomer Posted September 25, 2013 Report Share Posted September 25, 2013 I'm going to send them a known bad mic as soon as I get it back from the customer. As I understand, he can't get away from set and will post it in the next day or two. From that point, DPA will be able to figure out the issue. I wish I could make the wheels move faster on this, but at least they are moving. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.