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About kosty

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  • Location
    Vienna, Austria
  • Interested in Sound for Picture
  • About
    Music recording, post production, location sound

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  1. Thanks for the hint ! Unfortunately it was only a typo and the wiring was correct (pin 3 VDC and pin 5 NF).
  2. Update: I rewired one of the black lavs to universal wiring and it's working now ! Since my COS-11 are working with servo bias, I don't think it's the transmitter. Is it possible that the VT402 requires a 1k or 1k8 resistor like the Sanken in order to work with servo bias?
  3. I have attached a short video in the initial post. I also tried removing the bridge between pins 2 and 4 setting the bias voltage to 2V but the problem is worse. I'm going to try the universal wiring next.
  4. Hi Larry, Apparently VT is referring to "Mic Output" as NF, but I don't know what it stands for. I tried to rule out every possible fault after the wireless receiver. Changed channels, frequencies, cables and also transmitters. With the same settings other lavs like the Sanken, Lectrosonics or DPAs are working fine. On the intermittent ones I can also see the metering on the SMDB dropping when the signal cuts off, so I'm quite sure it's not after the receiver. On the Sennheiser I also connected my headphone to the EK 2000 receiver itself without my recorder connected to the receiver. I'm going to test the setup at my office tomorrow to see if it has something to do with the location and also shoot a quick video of the issues. Best regards Pierre
  5. I'm having troubles getting my Voice Technologies VT402 lavs to work with my Lectro SMDB and Sennheiser SK 2000 transmitters. I used the servo bias wiring with a bridge between pins 2+4 for 4VDC positive bias for the Lectrosonics SMDB. The lav needs a crazy amount of gain to get any decent amount of level and then the signal is intermittent every few seconds. It's not a hard on/off signal loss, but the signal fades in slowly (~2seconds) before disappearing again. The transmitter is not showing any overload or not enough signal, I think it's overloading something (zener diode, FET?) in the input of the transmitter. I wired a second lav the same way to make sure it isn't a bad soldering job, but the result is the same. I also tried to ground the strain relief in one of the lav as suggested for other VT lavs. I then ordered 2 more VT402 from Canford UK and asked them to terminate them for my Lectro SM. I also ordered another one terminated with LEMO 3 for Sennheiser 2000. The Lemo 3 one is behaving exactly the same with my SK 2000 transmitters. Not enough gain and intermittent signal with slow fade ins. This confuses me because it's a different connector with a different transmitter and a different wiring. What can cause this behavior ? The other 2 lavs for the Lectros have been wired the same way as I did previously (1-ground, 3-NF, 5-VDC and bridge between 2 and 4.) These are acting differently now. The signal is not intermittent and the level is good (around were my COS-11 is usually set) but the noise floor is very high. If I switch to my Sanken they are almost dead silent. A technician from Voice Technologies couldn't explain what was wrong with my first 2 lavs I wired myself but suggested I can try removing the bridge between pins 2-4 to lower the bias voltage to 2V instead of 4V. According to VT, the lav accepts a bias voltage between 0.8 and 5V. So my questions now are : 1.) What is causing this intermittent behavior with my Lectros and also with my Sennheiser 2000 ? 2.) What can cause the high noise floor on the one's that are more or less working ? And why are they behaving differently then my others with the same wiring (the only difference I see are the Switchcraft connectors I used instead of the Rean from Canford) ? I'm going to try to reduce the bias voltage to 2V and if this doesn't help, I will resolder one to universal wiring to see if that works. Thanks for any input !
  6. kosty

    Ambient or Denecke for Lockit?

    Go for a used 202CT or 203 if you don't need the wireless sync of the 204 / tiny lockit.
  7. kosty

    5.1 Surround downmix

    LtRt can cause weird sound in stereo playback (if not decoded) due to the sum of Ls and Rs being added to L and R with 180 deg phase inversion. If you have the exact same signal in Ls as in L (but not Rs) this signal will not be played back in stereo mode without decoding first. One more thing to consider in most home theater systems is that the subwoofer not only act as a real .1 (LFE channel) but also as a bass extension of your surround monitors. In a theater these monitors are fullrange, whereas at home, due to the small size of the monitors, the low frequencies are routed to the subwoofer via bass management. This means that the subwoofer is playing every bass content + additional LFE, which can overload the woofer driver at loud volume (creating harmonics). Have you ever wondered why your HT sub is suddenly very loud in action scenes and you want to turn it down a bit? That's why
  8. kosty

    Mic importing to US

    How much is the US import tax and the use tax? If an European dealer ships outside of the EU, he doesn't charge the national VAT (20%). It will be less trouble in case the parcel gets damaged or lost during shipping if you order from the dealer directl
  9. kosty

    744T and SSD

    I tool the numbers from the samsung website (http://www.samsung.com/semiconductor/minisite/ssd/product/consumer/850evo.html) I just wanted to point out that from my personal experience, there is no real difference in power consumption between HDD and SDD, as stated on the Sound Devices FAQ for the 788T regarding this topic.
  10. kosty

    744T and SSD

    My 744T already shipped with the SATA adapter since it's a newer one (built in 2012). The old disk was a Seagate Momentus Thin 250GB with a power consumption of 0.45A at 5V = 2.25W. The Samsung 850 Evo 250GB draws 2.2W to 2.4W, so no difference to the old one. Apparently the numbers were wrong on my local dealers website when I bought the SSD. According to the samsung website the 120GB model draws marginally less power (2.1-2.4W).
  11. kosty

    744T and SSD

    For those looking to upgrade to SSD, I can highly recommend the Samsung 850 Evo series. After my 250GB Sata harddisk suddenly broke down, I replaced it with the 250GB 850 Evo. I don't need a disk that large but the 250GB has lower power consumption than the 120GB model. It has been running smooth for the last 4 months. The biggest benefit was the much lower RF spray compared to the regular drive (about 2 pixels lower on my Lectro scan in the bag)
  12. kosty

    Lectro firmware update?

    Isn't it possible to update the fw on the SRc with LectroLink anymore, like on the SRa and SRb ?
  13. kosty

    Any disadvantage to using regulated power?

    One disadvantage is that you can't read how much juice is left in the battery with a volt meter (external or the recorders internal one). For example, with unregulated power, I know that my battery is almost depleated at x.xx Volts, so I can judge when I need to switch batteries.
  14. kosty

    5-pin Lemo to Lemo TC cable wiring

    That's the seller I ordered mine from. I decided to resolder both connectors today and I know how to wire it correctly now. In order to use the tune feature of the lockit master controllers (ACC 101 and ACC 501) with other lockits or Sound Devices recorders, you don't need any LTC connection. To tune the internal crystal of the master controller from an external lockit you only need ground (pin1) and tune (pin 4). To tune an external lockit from the controller you need ground (pin1), tune (pin4) and ASCII (pin3). Pin 3 goes to pin 3 and pin 4 to pin4 on the other connector. Since the cable I bought only has 4 wires I additionaly wired pin5 (ltc out) to pin2 (ltc in) to use it as a uni-directional TC cable. The quality of the connectors isn't that bad. The pull mechanism can be stuck if the inside assembly is not correctly inserted into the shell. You can try to reassemble your connector.
  15. kosty

    5-pin Lemo to Lemo TC cable wiring

    Thanks ! To jam sync or connecting to cameras I usually use uni-directional lemo -> xlr/m -> xlr/f -> lemo or bnc cables. I was just wondering if the tuning process of the ambient crystals require bi-directional cables.