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Found 17 results

  1. Wisycom RF Interference

    Had a shoot in a building that may or may not have had an FM radio station broadcasting from it in the Mid-Wilshire district of Los Angeles. Multiple frequency scans with my Wisycom MCR42S receivers with the latest firmware produced many clear frequencies with very low noise floors. Upon dialing up the transmitters (MTP40S with latest firmware), the gain level on the transmitter showed that the lav mic cable was acting like an antenna and picking up all kinds of stray RF. Here's a photo of the transmitter gain level in a silent room with a DPA 4061. Tried a B3 and COS-11 and got the same results. At the mixer, it sounded like the signal was gating (compander pumping?) and the gain level on receiver was almost nonexistent except in peaks of dialogue when the compander would fully open up. Tried both ENR and ENC modes. Made sure tone squelch was on. Raised squelch and no change. Tried multiple transmitters, all with the same results. Tried multiple open frequencies. Any solutions to this problem? Thanks.
  2. Hi folks! I'm a bit of a hardcore lurker here, and while I read much, I post little. I'd first like to commend everyone for maintaining such a fantastic community and resource for soundies everywhere! I've learnt (and continue to learn) so much from here. One thing that someone said (can't remember who) but it really stuck with me, was that in this day and age a good production mixer needs to be as knowledgable as possible about RF, and so I've been researching as much as possible and trying to come up with ways to improve my professional practice. One day soon I'll own a full Zaxcom rig to go with my Nomad, but for the time being I'm trying to hone my skills, and get the most out of what I have (G3s). I think one of the most important purchases to further this ethos was an RF explorer, which immediately gave me invaluable real-time feedback on what was happening in the spectrum nearby. I also use the FreqFinder app to help coordinate frequencies and avoid intermodulation issues, and finally have been modding my G3s with SMA connectors to use external antennas / distribution (details are in the topic about this also in the DIY group). I also purchased a bunch of Nitinol super-elastic wire and SMA male crimp connectors and have been making my own whips. So finally to the dipole adapter! I was thinking for a long time about a versatile and easily made dipole antenna (plenty of people make them quickly and easily from coax), but I wanted it to be relatively sturdy as well as compact, and I also wanted to try and have some sort of integrated Balun. I finally discovered the sleeve dipole (which uses a 1/4 wavelength sleeve around the feeder coax as both the lower half of the dipole and also acts as an integrated balun of sorts). So with a few plumbing fittings, some copper pipe and end caps and couple of SMA connecters the 4D mk1 was born! (Dave's DIY Dipole 'dapter). Key points: # - I wanted something that could be mounted almost anywhere easily so there is a 1/4" 20 mounting point epoxy'd into the bottom which fits a squillion different common mounting thingies (pic below shows it attached to a little ball head and 1/3" thread adapter on to a mic stand). # - I made it so that it is an adapter not a complete dipole - you simply screw a whip on the top and suddenly you have a dipole! I've yet to discover the effect of 'tuning' a dipole with only one half of it changing length though... However the parts are so cheap that having several for different 'blocks' would be no trouble - and maybe the thickness of the sleeve half of the dipole would increase the bandwidth a bit? # - It is also pretty easy to attach to a harness (as shown) and the top whip sits above the shoulder for a good LOS to the TXs if they are behind. Finally, I also have heaps of questions and ideas about RF and antennas that I'd like to discuss and share so perhaps this topic could also be a place where people can talk about the sort of things that aren't normally found in HAM radio texts? Cheers!
  3. RF Headphones

    Hi does anyone know any RF headphones which can cut it for critical listening, or are they all too compressed to use? I was looking at the Sennheiser RS165, which are closed back. I wanted something for artists to use tracking vocals in a studio, so they need to be zero latency, but also to use for general mixing. Are there any RF or equivalent wireless headphones anyone knows of that are decent enough quality?
  4. Hi guys, Anyone know which blocks are clean in Georgia, Tbilisi? Best regards, Nir
  5. I'm doing a reality show at the moment and am sometimes getting this strange interference on wireless. The wireless in question is a Sennheiser 2000 series with a DPA d:screet 4060 mic going into a Nomad. Like you can hear from the sample, it is a quiet pulse not too far from a digital "phone ring" sound. Now I want to ask if anyone might recognize what it is? I'm guessing it might be 4G or 3G phone interference or some other type of interference from a smartphone bleeding into the signal? If it is, then I suppose I'm S.O.L. since the talents of the show are on their phones all the time. Luckily the interference is not worse than that. interference.wav
  6. This Wednesday July 30th! Join us at our Los Angeles branch as we host Massimo Polo for a special Wisycom Q&A session. Massimo will be discussing some future firmware updates, getting the most of your system, and best practices for wireless on set. The event starts at 10 am PDT. You can RSVP by emailing rsvp@trewaudio.com
  7. Lectro blocks in japan

    Hey guys I'm about to do a short shoot in Japan and was wondering if anyone out there has shot there and what lectro blocks are clear? I know Japan has a 10 mW power output limit but was hoping to still use my normal mics as its a short shoot and don't want the hassle of renting locally. Right now I am planning on using blocks 19 & 21 for my cast. Any thoughts on this? Also, anyone use comteks out there? Thanks a bunch -Danny McCullough, CAS
  8. I've been following the 633 threads but haven't come across any comments about whether it throws any radio interference into your wirelesses. I would think not, since it doesn't have a hard drive, but I thought I'd ask... Any Comments? Cheers, Brent Calkin
  9. Nomad RF block 21 and 24

    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.
  10. RF Explorer (palm-sized scanner)

    a palm-sized scanner. the spectrum analyzer is a handy and affordable palm-sized box that scans a range of frequencies and tells you what’s nearby. http://livedesignonline.com/sound/closer-look-rf-explorer-scanning-wireless-world?NL=LIVE-03&Issue=LIVE-03_20130523_LIVE-03_716&YM_RID=peterlopata@yahoo.com&sfvc4enews=42
  11. RF scanning?

    Hi all, Pretty new to field sound. Ive recently been having issues with scanning for clear freq's. i have 4 lectrosonic 411a's. maybe im doing it wrong? my way: Turn on all receivers and transmitters. let sit for a couple seconds. then, turn off all transmitters. Scan with all 4 receivers ( blocks 19,20,(2)21's ) at the same time. find the clearest location on each rx and tweak on all matching tx's. everything is fine until i place them on the talent. It seems like i cant be any more than 10 feet away from all 4 without losing full signal. any suggestions would be great. thanks
  12. Hey Guys, Thought I would share this crazy story. I was shooting a reality show for Much Music in Banff, Alberta and the director approached me the morning of with a crazy request (as per usual). He wanted to have the contestants start at the top of this hill and go tubing down to the bottom delivering lines. I thought it would be a great chance to try out my Lectro SMVs at 250mw. The talent was about 150 meters away at the top of the hill and I had to pull my 411s out of the bag to get the antennas higher up but as you can see from the picture, pretty much full RF the whole way down. Great work Lectrosonics!
  13. I've been reading A LOT of stuff on the forums lately about antenna's and RF. I'm looking to buy something for my bag to increase the range of at least one mic - not sure if I want to install a distribution system to feed all 5 of my receivers. I read up on the antenna tests that were in the 695 magazine a couple years back, where they seemed to find that mixing antenna types for lectrosonics gear was not a good idea, because lectro's add the signal from the antennas together, instead of picking one or the other. I want the range that a batwing antenna would give me but I'd prefer to carry one instead of two in my bag (reality style over the shoulder trying to keep the weight down). My question is this, and Larry, you're probably the best person to answer this if you're out there: Which would give the best range performance and reliability (no drop-outs) in a lectrosonics 411 receiver - a whip antenna on one antenna connector with a batwing on the other (say an ALP 620), or just the batwing, leaving the second antenna connector open? I saw something in a Lectro faq about an antenna connector being a terrible thing to waste, but I haven't really seen anything about what effects leaving that second connector open has? Would the receiver still use the non-existant signal from the open connector and add that in, or would it disregard that input? Thanks!
  14. My friends and former neighbors at Vark Audio have developed some easy-to-travel yogi antennas specifically for us location folks. They look pretty good and Evan Mater, who designed and built them says they seem to perform pretty well, offering around 10 dB of gain. Here are a couple of cellphone shots I snapped of the prototype while I was visiting the Vark shop today: The longer section is right around a foot long, just for reference. Mounting is via 3/8" X 16 threads in the Delrin block, which you can sort of see in the picture. Evan says the mounting holes will be on the other side of that block in production units. Best regards, Jim
  15. Sanken CS3e RF interference

    Hi all, I have an older Sanken CS3e and I am picking up a lot of RF interference when it it held next to electrical appliances particularly florescent tube lights. There seems to be little to none Interference when the rear of the mic is pointing at a light but if the mic is parallel or pointing at the light then there is a considerable (completely unusable) amount of interference. We were using it along side a newer CS3e which didn't suffer from this problem, which leads me to believe that there is a problem with mine. I am aware that there is a modification for older CS3e, which I did, but it had no effect on reducing the amount of RFI I was getting. If the light is moved along the mic there seems to be a greater amount of interference at the front of the mic then the rear. I was just wondering if anyone else had suffered a similar problem with CS3e's. I suspect its going to have to go for a holiday in Japan! Many thanks Chris McQuillan
  16. Hi Folks, At last months AES, Henry Cohen chaired a seminar entitled, "TVBDs and Geo-Location Databases: An In-Depth Look and Their Impact on Wireless Microphone Usage" with an all star group of panelists. Here's the write up from AES' website: Panelists:Jesse Caulfield, Key Bridge GlobalJoe Ciaudelli, Sennheiser USAIra Keltz, Federal Communications CommissionMichael Marcus, Marcus Spectrum SolutionsSteve Mendelsohn, ABC NY JetsDavid Pawlik, Skadden ArpsEdgar Reihl, Shure, Inc.James Stoffo, independent entertainment production RF coordinatorTelevision band devices (TVBD) are a reality and the first of the geo-location databases directing TVBD operations are in the testing phase. Operating wireless microphones, IEMs, intercoms and cueing in this new environment requires understanding how the databases work and the rules governing both licensed and unlicensed wireless production equipment. This panel brings together a diverse group of individuals intimately involved from the beginning with TVBDs, databases and the new FCC rules as well as seasoned veterans of medium to large scale wireless microphone deployments to discuss how the databases operate, how to use the database for registering TV channel usage, and best procedures and practices to insure minimal problems. Because this topic will define the future of wireless mics for the foreseeable future, we asked Henry if we could video tape the seminar. Here are the links: Part 1: http://vimeo.com/32188941 Part 2: http://vimeo.com/32197887 Please note that due to union regulations at the Javits, we were limited to a single camera "anthropological" record of the event, and no audio feed - I had to post-sync the mp3 recording of the seminar to the video! But, there is an amazing amount of information and opinions expressed at the seminar. We are in the middle of writing an in-depth article on the new TVBDs and their effect on wireless mics which will appear in next month's Gazette, but in the mean time this video has a lot of information. One thing is clear: If you are eligible for a Part 74 FCC licence, GET IT! Peter Schneider Gotham Sound
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