Technical Reference
276 topics in this forum
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- 0 replies
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Hoping there's a power user of PT out there that knows some sort of undocumented keyboard shortcut lost in the ages. I have a periodic signal that I want to cut into tiny windows for training a classifier. I want the windows to be sliced at each period. I have the file recorded at 96/24 and it runs about a minute and a half. Period of the signal is 1/90 seconds, but the response does change subtly during each sample. I can set up a custom grid in pro tools and slice to grid but the cuts will drift by a 3rd of a sample. 1-2 samples offsets are not the end of the world but it will add up to an unacceptable difference over the course of a minute that I will need to…
Last reply by theshawz, -
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- 8 replies
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What is the thinnest decent-quality cable stock for making adapters and jumper cables? About 90% of the cables I make seem to be 12" jumper cables that adapt some obscure connection to another. They are nearly always 2 or 4 conductors with a ground. I've been using generic mic cable that is readily available at local retail, but these cables are invariably too thick, especially the 4 conductor stock (ideally, it would fit into a TA5 headshell). I've run into this enough that I think it's time for me to buy a reel each of 2-conductor & 4-conductor cable stock that I can just have on hand. I know Belden is commonly recommended, but I'm looking for best comp…
Last reply by artofnois, -
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- 10 replies
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These days, I am looking for very small, yet easy to assemble cable connections. I found this guy with excessive knowledge on the matter and I thought I'd share it. https://www.mattmillman.com/info/crimpconnectors/ Matt has lots of other interesting topics on his page also.
Last reply by Fred Salles, -
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Well, the title says it all. I'll need some XLR cable length that should also serve on SuperCMITs. Maybe 30m max, so it's probably not very relevant, but I thought, I'd ask.
Last reply by The Documentary Sound Guy, -
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Hi all, I am heading to the U.S for a doco shoot and am planning on taking my block 21 wireless mics and block 22 camera hop (SR5 Rx + 2 LMa Tx). I will have scanning ability on both blocks. At this stage we will be shooting in LA, San Antonio, Toronto, and Chicago. I understand that 21 is ok but 22 not as good in places like LA. As my block 22 is primarily my camera hop and both TX and RX will have good line of sight and not be far apart much of the time that this should still be ok... Any thoughts or feedback appreciated (I will be running a back up recording of all audio if the link does throws a wobbly to be safe). Thanks, Chris.
Last reply by OB1, -
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I have been meaning to do this for a while because these devices are so damn cool but the anxiety around battery failing one day makes me sad. Fortunately they are not too tricky to get into, and do not over utilize glue! Chips on the board are all shielded, downside is I can't document them, upside is RF shielding. Also interested in modding firmware though I am a total novice so that is going slowly (planning to ask around Def Con in a few weeks for recommendations) https://github.com/LoganSound/Deity-BP-TRX-Repair/tree/main https://imgur.com/a/UUb3bIW Battery Text Reads: AP158 3.7V(10.36Wh) 4.2V 2800mAh
Last reply by Conor, -
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- 8 replies
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I have a schoeps 641 and an mkh50 that I use with a trx 743. I’ve noticed that when the boom pole gets jostled, there’s a small burst of static and it sounds the same on both mics. I’ve isolated it to the mics and I wanted to see what might be causing this and what I could do to fix this?
Last reply by Paul F, -
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Have an old 302 mixer. Works fine, but the LED ribbon is either broken or unseated. I could most likely buy a part from Sounddevices or just look up the part number and find it from an electronics supplier. However, I cannot get to the actual ribbon. It's sandwiched between the two boards. I took the rubber knobs off of the pots. Seems like the nuts are holding it together from the front side. Any idea as to any things I need to do to disassemble the unit enough to get to the inside? Many thanks.
Last reply by Philip Perkins, -
Coles 4104
by rosa- 1 follower
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Hi, I have a Coles 4104 that sounds good, but the noise of the preamp is very noticeable when I turn it up to the level needed. Ive tried 3 different preamps with similar results. Its the same noise of a preamp that is heard when turning up the gain without a mic loading it. When I connect the microphone, the noise is the exact same, but combined with the microphones signal. Searching online I don't see any mention of this issue. Could anyone who has used this microphone describe their experience? I've used other, much cheaper, ribbon microphones and never noticed this level of noise. Thanks, Rodrigo
Last reply by Izen Ears, -
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- 8 replies
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My trusty (about 15 year old) 416 went scratchy today, intermittently crackling with multiple cables. I had opened it once before so I was curious to take a look and found that one of the two resistors on the input stage had badly corroded (see pic). Sharing this for others, perhaps for my own memory, and to take the comments of those wiser than me: fire away. Notes on opening: -Remove the C-clip from inside the XLR jack with a pair of needle nose tweezers or tiny screwdrivers, while this actually wasn't necessary in this case it's worth noting. -Turn the flathead set screw on the exterior and remove it -Remove the top outer case, the XLR jack assembly…
Last reply by LoganSound, -
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Again, mad physicist exploring TC world here. 😁 Is HDMI timecode LTC and is it using Consumer Electronics Control (CEC) pin bus? Or maybe Pin 17? I understand timecode over HDMI is a hack introduced by Atomos almost ten years ago and then adopted by many manufacturers but can't find any technical details about it... any pointer? [EDIT: or is it SONY with the FS100? as discussed here on jwsd] Thanks in advance... Fun fact: looking around I learned Atomos under CEO J. Young was a shitty place to work at. PS: I'm referring to pin 17 as "Utility/HEAC+" signal, defined in HDMI 1.4+ version. This signal moves from pin …
Last reply by lutzray, -
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hello does anyone know independent repair shops in NY or NJ ? (or near these states) the phantom power of my Sound Devices 633 dont work anymore. thanks
Last reply by Dan Savio, -
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Check my poll.
Last reply by Adam Aslan, -
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- 70 replies
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OK everyone. I'm off work and I have nothing to do but to read this board. And there's an epidemic of "What frequencies to use in......." -threads so I figured; why not make a Google Document Spreadsheet that ilsts all of these "OK" frequencies to use in different countries? We are legion on here, from all over the world so acquiring the info from locals wouldn't be that hard. Let's give it a try at least. This is the link for it. I contributed with Sweden. https://docs.google.com/a/tjockishjartafilm.se/spreadsheet/ccc?key=0AgnGQulSs_YrdFAwZGZ2LWVjRkRuY0owOEtHcHZqclE#gid=0 Anyone can edit or add information. You don't need a google account to edit If…
Last reply by LoganSound, -
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- 6 replies
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Hello, I am trying to understand how are RF power measurements made, how to check that a transmitter has the right RF power output, how to test RF antenna cables insertion loss, etc... I got myself a little gadget that is supposed to measure RF power outputs in dBm and mW. But it is a cheap stuff and I am getting weird results, like higher measure when adding cables... Before I dismiss it completely, I realised I need to actually understand what is it I am supposed to get. So, for those of you RF insiders, what is the correlation between the rate of a transmitter power and what is measurable at the antenna output? in other words, if I have a transmit…
Last reply by LarryF, -
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- 4 replies
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I have read references from various sources referring to a Nagra III parts list. One that was included with the machine at one time. Does anyone know where / if such a list exists? I have found the American written owners manual, the instructions manuals 1963&1967, and the German service manual, which i am in the process of translating to English. I don’t think this parts list was a complete list with exploded views, but rather a text list of items such as pinch roller and belts. I own two N3s and wish to restore them as much as possible. It looks like no one is servicing units anymore, and i have a desire to create a manual closer to a “proper” one. I see various par…
Last reply by Clay Reeves, -
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- 4 replies
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I have recently upgraded my A10-RX to a new A20-RX. The idea is to move from the crowded UHF band to the 1.3 GHz band and to reduce the lenght of the antenna on the A20-mini transmitters. As I was searching technical informations about the effects of obstacles, and especially human body, on the transmission at higher frequencies, I found this very interesting study: https://www.bakom.admin.ch/bakom/en/homepage/frequencies-and-antennas/facts-and-figures/the-effect-of-the-human-body-on-wireless-microphone-transmission.html If I understand well, if the body is an absorber in the UHF band, it acts more like a reflector at higher frequencies. …
Last reply by Soundwil, -
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Hello All, Need some assistance if you can. I've got the SD633 and I'm trying to record Wav Poly on CF and MP3 on the SD card. I've updated to V4.61. The mixer is not allowing me to record MP3's. I've tried new cards of various sizes and I'm not recording in F mode. I've formatted the cards and I'm at 48K also. Is anyone else experiencing this? Any solutions would be helpful. Thanks, Russ
Last reply by Johnny Karlsson, -
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Hello, I'm new here and to be honest I don't know exactly where my topic belongs. I have had a Nagra III for 3 years (was my dream to have one). Now a week ago the belts started to give problems and I ordered new ones which will arrive next week. At the same time another error has crept in that I just can't find. When I record via microphone, the recording is crystal clear, but when I record via the two line inputs, the recording is simply muffled. Well, let's make it short: I'm looking for a service manual that says how to tune the Nagra (to a specific band for example LPR35 or LPR90). And a manual that says ho…
Last reply by SimonSays, -
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It's a longer story than needs to post here, but bottom line is : I need to fabricate a cable that brings battery power into the USB-C power port on this new mixer. Q : does anyone know the acceptable range of DC input voltages? The only power arrangement I can fabricate here, while waiting on shipments, will put aprox 14.4 volts into the port, way higher than the 5 V DC that comes with the wall power supply. (as everyone probably knows, the mixer/recorder will give aprox 60 mins run time with the standard 4xAA power module). Standing by with cable cutters and soldering iron! Grant.
Last reply by James Louis, -
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Has anyone determined which wireless frequencies are most/least likely to suffer from occupancy sensor interference? The Leviton sensors operate at 5.8 GHz but I have run into what sounds like intermodulation problems in UHF.
Last reply by Matthew Steel, -
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- 19 replies
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I have just read this very clear paper on SD website about the 32 bit float resolution, and... I am blown away. 1528 dB of dynamic range, a headroom of 770 dBFS ABOVE our standard 0dBFS !! I understand now why the MixPre series is so popular amongst sound designers. https://www.sounddevices.com/32-bit-float-files-explained/ But now comes to mind an obsessive question: if gear designers like SD and more are capable of creating machines able to record files in 32bit float resolution, why have they not implemented it in their pro range recorders (like the 8 series for SD) ???!? Anyone capable to clear the mystery for me? Thanks Fred PS: I …
Last reply by The Documentary Sound Guy, -
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Hi , I've found this website and start read as much as I can!! There are professional users here and you help is really precious. I bought a Nagra 3 recently ( I was looking for it from many years..). It is nearly perfect for what concern the body, it looks like new, this is incredible for a 60 years old piece... and inside seems to be never repaired. All the Red paint is in place. New batteries are now inside. The motor run as it should! 4 speeds Rewind is ok, fast forward too. It plays but the sound is not so loud from the central speaker ... I tried to record putting a bass…
Last reply by cente, -
- 1 follower
- 10 replies
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I planned on using an Ambient UMP-2 with a Lectro SMWB for boom. The setup basically works, but there is a whistling noise when using the SMWB. I guess it is neither the cable nor the power supply as I tested both with an older SMa, and there is no hiss. The noise is present on all 3 of my SMWBs. Did someone here encounter this or knows a workaround?
Last reply by karlw, -
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- 4 replies
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I’m recording a college marching band inside an arena. Should I be worried that it will over power my Scheops CMU6 with MK4 cardiold capsule? Would a dynamic mic work better? I’m concerned about echo too. I’m also wondering if a sanken lav on a drummer would get me crisp drums. Any suggestions appreciated.
Last reply by Tilt Down,
