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Matthew Steel

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    Live sound and recording for higher education

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  1. The university where I work does live streams of 2 chapel services per week, plus athletic events and other special fine arts events occasionally. If I am involved it is usually in an auditorium setting and I am also running sound reinforcement and an audio record mix anyway. So in those cases I just send the record mix to the webcast people from the video department. We use analog lines since they are nearly universal. As we are in an installed situation we don't have lots of temporary lines and noise hasn't been a problem. Never would think of WiFi for an audio feed. Occasionally if it is a multiple night live fine arts event (e.g. dramatic production with 7 live performances) the camera crew has come to rehearsals to get shots they couldn't get with the audience present, then other shots at an early performance. They then can have a day or two to edit things together and then stream the edited version "live" during a later performance. Shh. Don't tell anyone.
  2. Matthew Steel

    Lectro LMb v2.13 changes affect mics with nonstandard wiring?

    Are you telling me that ceramic clad 5W wirewound resistors won't work? Just kidding - Yes, I got 1/8 watt metal film 1% as recommended in this other thread. I would not have thought about metal vs carbon otherwise. It still amazes me that when I was learning the resistor color code the only options for the tolerance band were gold and silver - and now 1% resistors are only two cents each.
  3. Matthew Steel

    Lectro LMb v2.13 changes affect mics with nonstandard wiring?

    Yes, when I discovered that rewiring the mics would fix it I decided to bite the bullet and rewire the mics to present day recommendations. We still need compatibility so I'll do the "compatible" wiring and I already got some resistors for that purpose. I do the wiring myself so I can do a few at a time as I am able.
  4. I wanted to share our experiences with newer LMb transmitters in case somebody else runs into the same issue. Newer LMb transmitters (those with firmware 2.13) appear to be more picky about microphone wiring than earlier versions of the LMB (2.10 and 2.11) or other Lectrosonics transmitters we have tried. As we have been transitioning out of 600MHz we have chosen to standardize on the LMb, mostly for cost reasons, and because its features meet our needs. We have had lots of trouble with the transmitters we bought new, which had v2.13 firmware on them. The problems appeared to be related to low audio level which required high transmitter gain settings and resulted in high noise as well as poor immunity to RF sources like cell phones. However we had bought a couple of older used transmitters and these did not exhibit the same problems. It seemed unlikely that eight transmitters bought in two batches would all be broken, so I made a call to New Mexico. I found that there was a circuit board revision that came out with v2.13, but changes were not expected to affect the audio input portion of the transmitters. Now, note that we have been using Lectrosonics transmitters for decades and when we first began using M185 VHF transmitters we followed the microphone wiring recommendations at that time for our MKE-2 microphones: pin 1: Shield. pin 2: Bias (red). pin 3: Audio (blue). pin 4: Jump to pin 1. pin 5: Not connected. shell: Not connected to shield. Through the years we bought different Lectro transmitters but we never fully retired the old ones - so we needed all our microphones to be compatible with all transmitters. Each time we bought a new transmitter we checked out the microphones with it and the wiring we were using seemed to work fine. This was the case with the transition to servo bias wiring even though new "universal" wiring recommendations were published along with the input change. Our existing wiring appeared to perform equally well with M185, UM200c, UM400a, SMa, and (older) LMb transmitters so we stuck with it. The solution turns out to be simple (but relatively painful) because the currently recommended "universal" wiring (Figure 5) does indeed perform satisfactorily with all the transmitter models we own, and so all that is required is to rewire all our MKE-2 mics to the newer wiring. The painful part is that we have about 50 microphones that need to be rewired. I would find it interesting if any of the Lectro insiders here would have any comments. Specifically, knowing the way our mics were wired, would the new PCB or firmware be expected to make this kind of difference or is this totally unexpected? Also, would a Lectro M150 be expected to behave the same way as the MKE-2's? Should I rewire ours into M-152's if I want to use them with servo bias transmitters?
  5. Matthew Steel

    Lectrosonics UCR211 problem!

    Now, now, those can't qualify as "very old." (steps away to check something) Why, the user manual is dated 2004 - only 14 years ago. That's hardly "old" for Lectrosonics gear, let alone "very old" Now, I'll grant you that our R185's are "very old" - but we still use them when we have to.
  6. Matthew Steel

    Lectro Block Frequencies in CSV or Excel?

    OK, I looked through my stuff and found this file I did sometime. Only 100kHz tuning steps, but that's when you really want the hex codes and stuff anyway. No guarantees that it is totally accurate. LectrosonicsFrequencies.xls
  7. Matthew Steel

    600Mhz question

    Also be aware that regulations for operating in the duplex gap and guard band specify pretty low power limits (20mW, if I recall correctly).
  8. I had someone (a friend of an acquaintance, etc) ask me to do this for him a couple of times. We approached it like @Mobilemike suggests and charged him our regular studio rates.
  9. Matthew Steel

    North Korea microphone surplus.

    Right. I understood the phrase: to mean that it looked like the picture showed microphones intended to have screw on capsules, only they didn't put any on. My (unimportant) point was that some mics that look like that actually have internal capsules, and two of them to boot.
  10. Matthew Steel

    North Korea microphone surplus.

    Those look to me like AKG D224e microphones. Funny you should say the capsule thing because if I have identified them correctly then they actually each have TWO capsules each - one for low frequency and one for high frequency, along with a crossover to combine them into a full range signal. https://martinmitchellsmicrophones.wordpress.com/2014/05/25/akg-d224e-circa-1970-the-best-dynamic-microphone-ever-made/
  11. Matthew Steel

    Guard Bands

    I believe the limit is actually 20mW, not 25. And G3's can do 10mW but with the who-knows-what noise floor in the guard bands and duplex gap I can't imagine it would give much range. And Microsoft drones on and on in their comments to the FCC about how wireless microphones have all this "new" space and don't need the TV bands which are so indispensable for WSD broadband. Humph!
  12. Matthew Steel

    Dear Licensee: Greetings from T Mobile....

    Official FCC documentation here. You may have to wade somewhat deeply into the data to get the information that you really care about, but the "Phase Assignment" file should answer your question about the TV transition schedule.
  13. Matthew Steel

    Dear Licensee: Greetings from T Mobile....

    @Philip Perkins thank you for sharing this. I have searched many places trying to find dates for commencement of operations. The site in your letter finally gave me that information, at least for TMobile - who seems to be the auction winner that is most aggressively deploying.
  14. Matthew Steel

    Lectrosonics SMWB coming soon?

    The manual confirms my suspicions: "The recorder samples at 44.1kHz rate with a 24 bit sample depth. (the rate was selected due to the required 44.1kHz rate used for the digital hybrid algorithm)." Changing the internal sample rate may not be a simple matter (or it might).
  15. Matthew Steel

    Lectrosonics SMWB coming soon?

    I think the manuals and photos were still protected under the confidentiality letter when I first located the filings. Sounds like an exciting product.