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About LarryF

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    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.

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  1. Hi Chris, That's a custom connector made by us with the compression o ring. Call service for the part. Best, Larryf
  2. We took a third octave equalizer and the Maximouse box to various musicians in Albuquerque and let them play with settings to their hearts content. We then duplicated the third octave settings in the unit on the "music" setting. As you might guess, it was bass boost and treble boost with a pulled down midrange. The tone control controls both boost levels, taking one up and the other down. Kind of a seesaw effect. The "voice" setting is flat, with a gently rising boost at 7k and up. The tone control works just on the treble. All influenced by a light weight paper cone speaker in a small cabinet, rolling off any real low end. But it was loud for a battery powered amp. We sold thousands in New York city and a handful in the rest of the US. Guess where all the street musicians were? Best, Larry F
  3. Over the years, some ch-40's were better than others with the newer ones being the most robust. They were typically killed with organ or some other constant level instrument and dead batteries. With good batteries the whole system was pretty bullet proof. You can find the Maximouse manual, of course, in obsolete products on the Lectro website. Best Regards, Larry F
  4. The CH-40 is a 20-24 Volt AC (!) power supply. It was nothing but a step down transformer. This was decades before the regulated DC power wallwarts so common today. That was even before we made small camera mount receivers. Our highest frequency wireless was 42 MHz. (No, I didn't drop a zero.) Our biggest sale was to Game and Wildlife since the long wavelengths were ideal for tracking dinosaurs. Best, Larry F
  5. Definitely use lead acids only. 4.5 Ah is close enough. Best batteries would be Panasonic from Digikey. Just check dimensions. Running them from the wall with dead batteries generally burns up the transformer in the wall wart, depending on levels of audio. It definitely will not reach close to full power with dead batteries. Probably about 2 Watts. And it won't sound too good as the voltage on the internal circuits will be dancing around at 120 Hz (60 cycle rectified). With good batteries it is an honest 7 Watts+ and the circuits will work properly. At about 2 Watts out, a photo cell LED module introduces a 2:1 compressor over the next 7 dB of range. In addition, the speaker is a custom made 2 Ohm unit with a light weight voice coil, short magnetic gap and large magnet. It has better efficiency than any other 8 inch we could find. In the midrange, of course. Finally, there is a clipper circuit, that boosts the treble about 10 dB before the master volume, after which the treble is cut 10dB. This gives you linear response overall but if you turn up the input preamp and run down the master, you can get an overload sound at moderate output levels with rounded off clipped waveforms. All this to say, a properly working unit, is indeed a MaxiMouse. No Super Cheese needed. Best, Larry F
  6. I think "abandoned" is when the manufacturer no longer "services" the particular product. Service includes repair, manuals, and general support. Just not making it any more is not abandonment. I've always thought a company should service the product until they are forced, kicking and screaming, to give it up. That can be due to parts that, after many years, are no longer being made or parts that have become so expensive that it is not worth it to the customer to pay for a repair. Or the one technician that can fix the unit is 92 years old and has gotten very cranky. I have personally spoken to a large user that couldn't get multiple products serviced (factory checkup) after 5 years. I think that is a poor business choice. As an example of the difficulties of long term support, the 195 series is still being 95% supported as well as the ancient 185 series. Why 95%? Because the last American crystal manufacturer that would make special frequency crystals for those units has gone out of business. If it's not a broken crystal or a frequency shift required by the FCC auction, you are probably covered. If it be the case, we and you are up Paddle Creek. Best Regards, Larry Fisher
  7. Yep, LEF
  8. Hi Derek, The 4 way splitter has a loss of 6 dB. If you only use 2 of the 4, the loss is still the same. The 50 Ohm terminators will make only a negligible improvement. With passive combiner-splitters you always lose. Active units just use amplifiers to make up for the losses. We talk of dB of loss but another way to think about it, is that the loss is just the number of splits or combinations. Half power for a two way, 1/4 for a 4 way, 1/8 for an eight way, etc. Best, Larry F
  9. Hi Ant and John, There is about 30 to 35 dB of isolation between the input ports with a mini circuits (or Lectro) 2 way splitter-combiner. This is equivalent to having two separate antennas about 5 feet apart. There will be a small amount of 3rd order intermod (as with separate antennas) but rudimentary frequency co-ordination will prevent this from being a problem. You will also have this low level intermod with active combiners. The only downside is the 3 dB loss with a 2 way splitter-combiner but if you can live with 70% of normal range, then it is a viable option. Most times you won't even notice the slight range reduction. Don't ever use a simple T adapter between two transmitters: Intermod will be terrible, power losses will be more than 3 dB and the transmitters may very well go unstable, spewing random frequencies near and far. Best Regards, Larry F
  10. The SNA 600 has what are called fat elements (arms). If they were narrow wires for elements, they would be sharply resonate at a single frequency. Being "fat", the bandwidth is spread out over about 50 MHz. Ideally, you would center the arms between the two contiguous blocks you were wanting to use. Why does the SNA antenna work well over 4 blocks? It is the definition of "well". There will be 4 or 5 dB of sensitivity loss when you exceed the 50 MHz bandwidth. When you consider that RF levels jump up and down by 30 to 40 dB as you walk around and the usual setup has excess RF signal of 50 dB or so (50 dB more than minimum usable signal), it is obvious why a mis-tuned antenna will still perform. In a long distance setup, with low signal levels and little RF noise in the surroundings, (Flat Rock, Montana), the properly tuned antenna will give you a slight edge in range. For 98% of the time in typical use, a coat hanger bent in interesting shapes soldered to a BNC would work just fine. For those of us that are anal and use both belts and suspenders, having the whole RF chain as perfect as can be is comforting. If you really want to cover all four blocks perfectly, a truly wide band antenna such as an LPDA (Lectro ALP600 or others) is a fine solution. Walking around with a pair of paddles on your shoulders will result in good solid RF and knowing glances from those working around you. So, tune the SNA 600 to the middle of your blocks and go onward. Or cut a coaxial antenna to the middle of the blocks. Or there's the coat hanger option also. Best Regards, Larry Fisher
  11. Some engineer will answer tomorrow Wed. Lef
  12. I'll check with Lectro crew since we were in that area and packed up after the get together. LEF
  13. Back of envelope calculations give 6 hours on Eneloop NiMh and 7+ on Eveready Lithium assuming 4 hours on alkaline is correct. I assume Eneloop will be the usual choice. Best, Larry F
  14. Hi Kosty, Given what you have posted, I see no reason for this weird behavior. The fact that a Sennheiser with Lemos is acting the same way almost says it is after the wireless receivers, such as a headphone amp or mixer. Another wild ass possibility is high level ultrasonics in your testing area but changing locations should put that to rest. This has me stumped. By the way what is "pin 3-NF"? NF is a new one on me. Best Regards, Larry Fisher