Tom Duffy

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About Tom Duffy

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    Los Angeles, CA
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    R&D Manager, TASCAM, mainly professional products.
  1. Yep. Can't beat a >2.5MHz wide waterfall to see where those signals are. which UI? HDSDR or SDRSharp ? HDSDR doesn't have any bandpass filtering on its FM decoder, so it sounds bad when picking out wireless Tx. SDRSharp works on my home PC but not my work PC for some reason.
  2. DR-701D has HDMI through as well as In. In fact the HDMI Consortium specifically forbid us from doing a HDMI-in only product, that was our plan with the DR-70D They were actually rather insistent that we not do that. paraphrased "HDMI is a video format first"
  3. Yep, Times a hundred. For example - UHS-1 cards are the same "rate" as class 10, but the bus speed is twice as fast. If put into a device which doesn't run the bus that fast, is it going to give 100%, 50% or 10% of the performance? - it's also down to whether the SD card manufacturer decides to optimize it for continuous single file writes (video), bursty single file writes (camera), or multi file (audio), and whether they care about performance in slower devices. UHS-2 cards add extra pins, so is the manufacturer going to care about what performance it gets through the "legacy" pins? As long as it meets catalog spec through the UHS-2 pins? If a customer comes to us with a "I got a drop-out" complaint, the first reply to them is always "which card from the recommended media list are you using?" It's not "have you seen this list we thought you might like to know about" . TASCAM also sells branded CF and SD media, they are significantly more expensive than mass market devices, but we do back them up with a data recovery guarantee as well as using parts that have >4x the write-life of regular cards.
  4. I modified some off-brand LDCs in the past with the Scott Dorsey circuit which replaces the Hi-Z amp with a good quality FET transistor. The input impedence of the FET was 1000 MegaOhms, i.e. 1GigaOhm. The original circuit had a mere 200MOhm resistor. After soldering the parts to the board, it took several attempts with the cleaning fluids to get the mic to work - any contaminents caused leakage and thus reduced the output level signficantly. Moisture has the same effect. Drying out should certainly revive the mic, unless the filament of the condensor itself has warped. I believe the quality of the early Neumanns had a lot to do with the attention to detail paid when tensioning and screwing down the gold foil to the mount. Prolonged/Severe moisture has the extra problem of seeping into the screw threads holding the filament tight, at which point the microphone will not revive its previous specs after drying, because of uneven warping. If you are expecting to be in humid environments, going downscale on the microphone and carrying a backup might be a good idea.
  5. Basic Microphone background info for beginners: Low cost LDC and SDC mics are DC biased. This is fine for studio use, but out in the field, moisture in the air causes the biasing circuit to fail, resulting in low output or no output at all until they are dried out again. The Sennheiser MHK series were the first to use a RF bias (very high frequency) which does not have this problem. That makes them worth every penny for outdoor use. The Rode NTG3 is the only other mic I know with RF bias. Moisture doesn't cause failure straight away, so low cost SDCs with a couple of backups to swap in while the first set dries out is a solution. Shotgun mics were designed mainly for dialog - the directionality is high in the frequency band of the human voice, and is much less directional at low and high frequencies. So for sound effects, shotgun mics are less useful. From the discussion so far, I'm thinking that a mic basket/windshield/dead cat is going to be the most important part of the kit to get nice sound in the environments you are considering. The second most important part is going to be battery power. Mic choice 3rd and recorder choice 4th.
  6. Related request : Please have some pre-printed receipts for tax purposes / company reimubursements.
  7. Did you know: TASCAM DR-100mkIII (Stereo recorder) S/N ratio of 109dB, EIN -114dBu TASCAM DR-44WL 4 channel recorder (2 built in, 2 XLR). If you use the WiFi connection to your phone, the control app captures your GPS coordinates and puts it into the WAV file's BEXT chunk. Seems like you'd need to keep track of where each recording was made. Both have TimeOfDay timestamps, accurate to a few seconds which is all you'd need to get them in the ballpark for video editing later.
  8. The TASCAM iXR was designed for this use scenario, but it's iPad size, and 2 channels. The iPhone/iPad control app is now available, so you can turn on direct monitoring. Connects directly to iPhone/iPad. https://itunes.apple.com/app/tascam-settings-panel-for-audio-interface/id1213179586?l=ja&ls=1&mt=8
  9. I think the issue is that a cable gets additional wear if it's stored both on a reel and hand coiled over-under depending on the day / job. If its consistently one or the other, it will last longer. For stage shows where time taken to strike is very important, and the quality of the help is variable, it's a tricky balance. The big companies, e.g. Claire Global, will inspect, test and re-coil all cables that come back from a job, but a one-man team needs less hassle. The additional twists and untwists would certainly impair a network cable, for example.
  10. Rice is no good, that's a myth. Silica gel packs are much better. https://smartphones.gadgethacks.com/how-to/myth-debunked-uncooked-rice-isnt-best-way-save-your-water-damaged-phone-0154799/
  11. If the production is being taped, camera ops can (or know to) zoom in tight enough to hide the forehead mounted lav...
  12. Yep. I just got an Azden 105 Tx/Rx pair (560MHz-590MHz) for $41 because the box was missing the handheld mic. It's not diversity Rx, but perfect for a DSLR scratch track hop.
  13. From https://www.fcc.gov/consumers/guides/distribution-sale-and-use-wireless-microphones-operating-700-mhz-band-prohibited "As of January 15, 2010, the FCC prohibits the import, sale, offer for sale or shipment of wireless microphones and other low power auxiliary stations (i.e. similar devices) intended for use in the 700 MHz Band in the United States. " So strictly, even selling on ebay in the US for shipping outside the US is covered.
  14. Blood pressure rising... http://www.ebay.com/itm/Audio-Limited-Envoy-Wireless-Systems-4-Available-/322421159423 From another auction by the same seller: "I am a professional sound mixer of 24 years." "I am known in the industry world wide"
  15. The DR-70D and DR-701D have 10ppm clocks, which is 1 frame/hr worst case. OTOH the 701D is designed to be constantly clocked to the HDMI output of a DSLR camera or LTC output of some other device, which gives you 0ppm slip. I have no problem recommending the DR-70D for the use case described here, it's part of my own kit.