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Found 24 results

  1. Hi all I use a G2 for agency/directors headphones. It works well but sometimes is a bit limited on range. I know i could buy a half rack sennheiser unit that has bnc connectors for external antenna, but i was wondering if i could instal a sm or bnc plug into a bodypack transmitter to attach an external antenna. Has anybody do it? What would the wiring be like? Any help would be appreciated. Diego
  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. Recently I picked up a Sennheiser EK 2000 receiver on eBay for 250 bucks. At that price I figured it might need some repair but I lucked out- it works great. My kit also includes 7 other Sennheiser units, all are either G3 or G4 in the 100 series (EK and SK). I recently modded these units with the SMA antennas using online tutorials and videos and found that they are mostly the same, apart from small design differences. I have a friend who has also modded the 100 series units, as well as the 500 series. My question- has anyone here done this modification on a 2000 series unit? Is it [more or less] the same process? Are there any pitfalls to be aware of? This is the mod in question if you're not familiar and just curious: https://wavreport.com/2016/10/27/sennheiser-g2g3-sma-mod/
  4. Hello everybody, I'm Christian from BSRF (France), I'm glad to introduce the AS-122 a dual antenna splitters (2 inputs and 12 outputs). It's a low noise, 370-800MHz bandwidth with DC-feed and RF peak. You can check our website for more informations http://www.bs-rf.com Feel free to email or phone us. Christian.
  5. Hi guys, Returned home from a shoot the other night and realized that the rubber/vinyl 'tip' of one of my Sony UWP-D transmitters (UTX-b03) was missing. (see pics) The internal wire of the antenna is exposed, however repeated tests have shown there doesn't seem to be any detrimental effect at all (yet) - on range or audio quality. Can I just add any tip/cover to the antenna or do I have to replace the entire antenna? Hope you can help - thanks in advance!
  6. Hey Guys, what do I need to connect either Dipole or SharkFin antennas to my Micron Explorers. (I have two). Do I need passive or active, also would I need a distributor? It'll be a cart set-up. Would a distributor need power? ................ Waddayathink?
  7. Hi all, i m contemplating the idea of stepping up my antenna reception in my bag while remaining light and portable. Vast majority of my work my reception is sufficient with whips but once in a while i need that extra range. For now i got 3 lectro srb's (two in block 22 and one in block 25). i know i could get dipole antenna type to plug directly on the sr's but maybe allowing to remote my antenna to up to 15 feet would be better. size and weight is a priority in my choice of equipement and i d rather not have to put another piece in my bag permanently. Just something i could plug directly to the srb's sma when needed. thanks in advance for your advice, Dominique
  8. Hey guys, I may have a show starting later this year for which mobility and range will be paramount. Shooting in rivers, sand dunes, up trees, etc. So I've been dreaming up ways to solve the puzzle. Please excuse and forgive me if I touch upon a topic that's probably already discussed on here, but my searches haven't led me to this specific issue. I'm using an ORCA bag and harness with a 788 and a PSC Multi SMA. Talent Wireless is on blocks 24 and 26 (Sydney, Australia). I'm thinking of somehow mounting a small boom pole to the back of my harness and attaching a Lectro ALP650 to it, so that it hovers above my head. Is that ridiculous? What do you guys think? Has anybody attempted something like that on here? Any help would be appreciated! Cheers, pinky
  9. Jeff Wexler posted a clear and informative reply to Prahlad Strickland's question about diversity reception. Read it here: I posted my question there, but as it was off-topic I've re-posted here so as not to derail the thread. Lectrosonics' SR manual reads: "...the two channels can be used together as a single receiver in "True Diversity" Ratio Mode for enhanced performance in some environments." My understanding is that in Ratio Mode, the dual receiver SR "favors" the audio signal from the receiver with the stronger signal from the transmitter. If Ratio Mode on the SR is a combination of antenna diversity and receiver diversity, how is it better than receiver diversity? If I use a pair of receiver antennas (matched or not) in fixed positions for each integrated receiver front end in an SR, both receiver sections will have (presumably) identical range and reception from the transmitter. How does Ratio Mode purport to give a more robust signal than plain ol' receiver diversity?
  10. I've recently purchased a few options to move Nomad's zaxnet antenna to elsewhere in the bag. I then noticed a post from Glenn stating that, an antenna with a ground plane should be chosen if extending. (post 11 here) Firstly, what problems could occur when extending an antenna without a ground plane? Secondly, Is there anything in the specs of an antenna that will tell me if it has a ground plane (besides overtly stating it)? I have looked at many antennae over the last few days and haven't seen this mentioned. For the record, these are the items I bought (some of them thanks to Tom Visser and José Frias) http://www.ebay.co.uk/itm/2-4GHz-5dBi-Omni-WIFI-Antenna-SMA-MALE-for-wireless-router-/290848539329?ssPageName=ADME:L:OC:IE:3160 http://www.ebay.co.uk/itm/2-4-GHz-5-dBi-Omni-wifi-Antenna-BNC-for-wireless-router-/300479593163?ssPageName=ADME:L:OC:IE:3160 http://www.ebay.co.uk/itm/290607815327 http://www.ebay.com/itm/U-fl-to-BNC-female-with-nut-pigtail-cable-/330313219623?ssPageName=ADME:L:OU:IE:3160 And a pair of these (although these will live directly on Nomad and QRX 235 if used) http://www.digikey.com/product-search/en?x=0&y=0&lang=en&site=us&keywords=931-1119-ND
  11. Hello All, I'm thinking about adding this http://www.ebay.co.uk/itm/300441519823 antenna to my micron SDA 214-1 splitter/amplifier setup. All of my wireless (Micron, Audio LTD) are in the CH69-70 frequency range. 1) is it okay that the antenna works up to 960 Mhz range? Will the micron SDA 214-1 amplify only the range that it works in? (833-865 Mhz) I wonder because all of the cellular towers start at 870 Mhz in Poland and use 900-960 band also. Would it be better to have a yagi that works within Ch69,70 only? 2) i am planning to use extender male SMA->N female panel connector cables to attach them to the bag (http://www.ebay.co.uk/itm/300380267074?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649, http://www.ebay.co.uk/itm/N-male-N-male-plug-pigtail-semi-rigid-cable-RG402-/300486126120?pt=UK_Computing_Boosters_Extenders_Antennas&hash=item45f65e6a28), so i can switch between coax dipoles and a higher gain antenna like the yagi above, as long as the connectors are ok, the loss at the connectors is neglible,right? Thanks for your attention, Bartosz
  12. We have had two reports of loose antennas with the new Rev A of the SMJ antenna. It is a little surprising since the basic barrel is the same as on the previous version. Anyway here is a memo to our dealers from Karl Winkler. This saves me a lot of typing. LEF << Hi everyone, Just in case dealers call and ask about this issue... The latest version of the AMJ antenna is far more robust than the original version. So far, none have broken in the field. However, we are learning that there is an emerging issue: after some use, they can begin to spin, and can't be tightened (this is different than the issue with the elbow, which can be easily corrected by the user with a small screwdriver). In other words, they are tight at first, then with the internal parts are compressed a few times in use, they can no longer be tightened, and then they won't stay upright when used in the right-angle orientation. Here is what we are doing about it: 1) The part is being re-designed 2) All stock plus the 1000 units coming in next week will be re-worked (look for a hold on all AMJ antennas...) Here's what the user can do in the short term if needed: File off the very bottom of the connector (it is nickel plated brass so it is fairly soft) with a flat file to remove about 1/32" or 1 mm of material. Then, file off the burr to avoid injury. Let me know of any questions. -Karl >>
  13. We have decided to send out some beta samples of the improved AMJ (rev a) flex antenna. We need about 20 users that could test these on receivers and on transmitters and give us some feed back. The previous antennas were fragile and the longish hinged post was a problem on transmitters when mounted close to the body. Anyway, we can send out 4 max antennas to 20 users for transmitters and SR receivers with removable SMA connected antennas. Again, we want feedback within a month. Email me at larryf@lectrosonics.com with units, blocks and postal shipping address (we're cheap). Best Regards, Larry Fisher Lectrosonics p.s. no charge, of course
  14. We've added a series capacitor to the SNA600 to make it the "a" version. The previous version was a DC short to ground. This new capacitor makes it easier to use with the Venue receiver or others that provide a DC bias on the antenna port for powering remote, amplified antennas. Actually, the capacitor can be added with a little care to previous SNA600's. Any surface mount ceramic capacitor from 100 pF to 1000 pF can be used. If you need the cap, send name and address to larryf@lectrosonics.com for a freebie. If we had had our Lectro heads screwed on tight, we'd have put the cap on the original design. Best Regards, Larry Fisher Lectrosonics p.s. It does not affect the antenna RF performance, good or bad.
  15. We are now out of the AMJ antennas that we were giving away. This was due the fact they weren't up to our customers' ruggedness requirements. Though a bit fragile, we still gave away (got rid of) about a thousand of the antennas. The new replacement antenna is now available for money and is the AMJ rev A. The AMJ rev A version is much more rugged and requires at least 5 times the force to break or pull out the center pin. In addition, the connector side of the pivot section is much shorter meaning there is significantly less lever arm to put force on the connector structure. I'm hoping that these will be the antenna we were originally looking for: a compact antenna that can be used on transmitters and moved away from the body of the talent for additional range when needed or away from the body of the camera when used on a compact receiver. Best Regards, Larry Fisher Lectrosonics
  16. After running across checked my Zaxcom antennae and found them to be a little off of the correct length for my block. So I want to ask, how important is antenna length? I have two QRX receivers and some TRX transmitters. They have all operated well-enough. During my measurements I found some to be 1/4" too long, which puts them 2 blocks away according to the Zaxcom antenna length chart. The current TRX and QRX manuals show the same chart. I used precise digital calipers for the measurement. I can't say I noticed any difference now compared to before. There are so many variables that affect reception, how do I know if the antenna length was a weak point? I'd like to hear from Glenn and Larry. Mark O.
  17. Hi everybody, i've been working as location sound recordist mainly with a soundbag, but now i switch to a sound cart setup. i'm using 4 sennheiser ek 3241 receivers. can anybody tell me what is the best way to run them with two fin antennas? i think it's a simple question, but i would be happy to get some good advices
  18. I'm getting ready to add an antenna distro system to my bag and I'm wondering what you guys are using in/with your bags for antennas with your distro set up. I saw some Shure omnidirectional antennas at Location Sound Co. and thought those might be a good idea, but it seems like they's need to be up in the air, or if they were mounted on the bag I would have to make sure I was facing the talent. Maybe not. They also cover just about all the frequencies, so I could use them across all my blocks. Anyway, what's working for you guys & girls? Pictures would be much appreciated! Cheers, Tim Hays
  19. 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!
  20. I am doing my "homeworks" about antennas ;-) It is adviced to have a minimum distance of 10 feet between receiver and transmiter. It seems to me that it's correct with omnis antennas. What's about LDPA antennas? As they give a gain, the minimum distance, in the axis, should be longer ? 50 feet ?
  21. 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
  22. Hi everyone Here in the UK, we use for some wireless headphones and receivers a frequency between 864-865Mhz as it is free of licence. As this frequency falls in the rage of wide-band antennas, i was wondering if i could plug my ifb transmitter to the antenna out on my venue receiver and use my 2 shark fin antennas with it at the same time as using the venue? Will it work or will it make some interference from one system to the other? Thanks
  23. Hi folks, I always thought the Audio Ltd. TX/RX (and Lectro as well) had SMA connectors for the antennae. No I ordered a pack of SMAs for a small antenna distribution DIY project, and these are way bigger than the ones on the RX. Otherwise they look the same, just "zoomed in". Anybody care to give me the exact type of connector? THX in advance Peter
  24. Hi All, I have acquired some rather long sma antenna which are more that twice the length that I would need compared to my normal 1/4 wave antenna. I was wondering if there was any advantage (range wise/signal integrity) in putting these onto my receivers thus (as I understand it) creating a 1/2 wave type of receiver system? Thanks, Will
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