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About LarryF

  • Rank
    Hero Member
  • Birthday 12/11/1943

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  • Location
    Rio Rancho, New Mexico
  • Interests
    Classical music, fast cars and Maine Coon cats
  • About
    I have been chief janitor at Lectrosonics for 40+ years.
  • Interested in Sound for Picture

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  1. The quarter Watt units may be a special case. Various rules have come into effect after certain (long past) dates. Call 800 821-1121, ask the friendly human answering the phone for service and you will get a knowledgeable answer. Best Regards, Larry Fisher
  2. Over the last year, Lectrosonics repair times at the factory had drug out to 5 to 6 weeks. This was due to the large number of re-blocks from the television industry as the FCC forced the stations out of the auctioned frequencies. We received literally hundreds of units from each of the major networks. We finally had to run two separate service paths so that re-blocking didn't completely freeze out the regular repairs, i.e., the talent dropped it in the toilet. We were still overloaded and repair times stretched out way too far. Hiring more techs is difficult since they don't grow on trees, demand is at an all time high, and fewer persons are going into the technical fields. On top of that, hiring people for a year and then laying them off after the surge is over is not a Lectrosonics' thing. The surge was finally overcome by steady work, scheduling network stations in batches, replacing entire circuit boards rather than components, and lots of overtime. I am relieved to say, repair times are now normal and the techs are back to a standard 40 hour week. Best Regards, Larry Fisher
  3. See post #33 in this thread. There are safety aspects to using high quality batteries that have been safety tested. Chinese manufacturers in particular have made a mockery of UL and CE safety markings. The transmitters that use the NP-50 battery, are worth $1500+. The cost per use of a Lectro or real FujiFilm battery, is less than 15 cents per use. Best Regards, Larry Fisher
  4. Quality adapters look like 50 Ohm transmission lines (cable) and won't affect the antenna tuning (length). What will affect the antennas is moving them the adapters length away from the ground plane represented by the transmitter or receiver case. This effect will be small in the scheme of things because you already have a large bag of water (talent) detuning the antenna or you have surrounding gear like mixers and recorders in the bag. My opinion is that it is more theoretical than real. We determine the length of various antennas by mounting them on the case of a dummy device and trimming the antenna for best match to 50 Ohms. This is in free air and is rarely how the device is used but it is the best we can do. Calculating the antenna length in an EM program would take 10 times as long and be 1/10 as accurate. Best Regards, Larry Fisher
  5. Hi Nick, Thanks for the history and fun read. Best Regards, Larry Fisher
  6. One: I'd like an SR-digital also. There's a very large Eco system out there already. Two: The tumbleweed gods aren't angered by suggestions, are very down to earth and just roll with the winds of change. Best Regards, Larry Fisher
  7. Little tumbleweeds aside, this receiver is backwards compatible with specialty transmitters like the watertight WM, the small SSM, plugon HMa, etc. Backwards compatibility reduces the pressure on our engineering department and your bank balance. Best Regards, Larry Fisher
  8. LarryF

    Body absorption

    Shrink tubing that is only shrunk at the two ends with an air gap everywhere else. The more air gap, the better. Best Regards, Larry Fisher
  9. The AMJ have been improved several times as we have gotten feedback from the field. Though they are pretty tough now, they will never be as rugged as our simple steel wire whip. They are the easiest way to get a vertical orientation from a horizontal receiver or a receiver that is going to be used in a variety of positions. IMHO, buy the AMJ with a spare; good advice on any critical but low cost part of your kit. Best Regards, Larry F
  10. The crew has been made aware, will track it down and will try several of the thoughts posted here. Best Regards, Larry Fisher
  11. The voltage should never go to 72 Volts and should have little variance with the battery voltage. I assume something is wrong with that particular unit and that it is not a design fault. Best Regards, Larry Fisher
  12. With the good spring rains we have had in New Mexico for 2019, we are having a bumper crop of tumbleweeds. Best Regards, Larry Fisher
  13. In this case, no. The 48 Volts at the mic (under load) is not regulated in the usual sense since it configured as a supply with a high internal resistance (6.8k). What is regulated (spec'd) is the no load voltage, i.e., the 48 Volts. Under load, the voltage can fall to many possible values.Since the 48 Volt supply has a 6.8k resistor in each leg, a 1 mA load on each leg would give 41.2 Volts, 2 mA would give 34.4 Volts, a 7 mA load would give 0 Volts. And yes, there are some high current mics that will pull it down to 12 Volts or so. Measuring the no load voltage is the correct measurement. Best Regards, Larry Fisher
  14. There aren't any good answers. Separate antenna systems would be the best. Keep in mind, that if an antenna and distribution system covers 470 to 941, all the cell phone traffic, etc., between 614 and 900+ Mhz will be going through the distribution amp also. It would be best on a new system to just use 941 MHz by itself, assuming you can get the number of channels into that band. If you need lots more channels, two antenna distribution systems probably makes sense anyway. Another way of saying it, is we haven't solved it yet, either. Best Regards, Larry Fisher
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