Jump to content


  • Content count

  • Joined

  • Last visited

  • Days Won


About LarryF

  • Rank
    Hero Member
  • Birthday 12/11/1943

Contact Methods

  • AIM
  • Website URL

Profile Information

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

Recent Profile Visitors

4,072 profile views
  1. LarryF

    The horse has left that barn

    "Sucks" is a weak but polite description. On a transmitter, re-blocking usually involves a new RF oscillator. It always involves new or retuned intermediate stages and a retuned or new output stage. New firmware has to be loaded since it is rare that there aren't updates. Then the modified unit has to go through several levels of QC testing as if it were a brand new unit. Ninety-nine times out of 99, it is more cost effective to simply replace the RF board since new boards are built and tested in quantity. If the new RF board has different parts than the old board, it may be necessary to replace the audio board also, as it usually has the controlling CPU. We have seen many discontinued parts over the years and the old audio board may not be able to control the new RF board. Receivers are much the same. For receivers, it is changing out the front end filters, the diversity components, and probably the local oscillator. This is particularly onerous if it is a tracking front end. Sometimes it is cost effective to modify the old RF board with replacement parts. The rest of the process is the same including occasionally needing a new audio board. "Sucks" is a weak but polite description. Best Regards, Larry Fisher
  2. LarryF

    RF issues with RF multi + SNA600

    Your RF Multi could be acting differently than other RF Multis. Just because one RF device works doesn't mean the next one will. Keep in mind, I'm down to grasping at straws. I would try remoting the SNA's just for diagnostics. A few feet or so should be enough and if that "fixes" the problem, that is big information. I also would try turning all the other devices in your bag off and see if the SNA, RF Multi, and receivers is now normal. With weird problems like this, methodical divide and conquer is the best process. Best Regards, Larry Fisher
  3. LarryF

    RF issues with RF multi + SNA600

    I'm a bit puzzled here. The problem could be that the SNA's are close to the bag and picking up low level RF from the mixers, recorders etc. They all have low levels of garbage, some worse than others. That doesn't explain why the whips work well since they would be close also. The RF multi (whatever that is) could be the culprit but that works well with the sharkfins. The sharkfins would be farther from the bag but that doesn't explain why the whips work. The whips and the SNA600 have the same effective gain within a dB or so. One possibility is the RF multi (?) goes into oscillation when presented with the narrower band load of the SNA600's but not with the broader sharkfin load. Or the SNA600 is picking up RF from the output of the RF multi (?) because it is in close proximity and you have a feedback loop. Rf output to the SNA600 to the RF input of the RF multi. The sharkfins are farther away so they don't pickup the RF output and the whips are immune because they don't use the RF multi. Does the RF multi (?) have excess gain from its input to its output? Or you could just be using generic incense rather the the Lectro approved Tibetan Blue brand. Best Regards, Larry Fisher
  4. Article in "Wired" magazine about 4 years too late. https://www.wired.com/story/wireless-mics-radio-frequencies-fcc-saga/ Best Regards, Larry Fisher
  5. LarryF

    So, antenna issues with 941

    Several points about the antenna: 1. It has 3 dB of forward gain compared to a regular dipole or whip, a small amount of rejection at the rear and is broadband due to the angled reflector and fat arms. 2. The silver metal flange at the rear is for permanent mounting and can be bent at the various notches to handle any mounting surface. 3. There is a Lectro stand mounting kit but right now I'm getting a 404 error. You can see it on the data sheet though: https://www.lectrosonics.com/US/All-Accessories/product/pca900-2.html#data-sheet 4. Please note that this antenna says "VERT" rather than "UP". (See we learn, we're just slow.) Best Regards, Larry Fisher
  6. LarryF

    Microdot to Lectro TA5 failure

    Hi Dalton, And the terrible thing is, if you forget to mark the lines in the heat of battle, you have to start all over again. Best Larry F
  7. LarryF

    Microdot to Lectro TA5 failure

    Dalton and Rado, Increased losses from connecting and disconnecting RF connectors is pretty much a myth. I would get a very tiny magic marker and mark a tiny line on the side of the SMA or BNC connector. After I counted 10,000 lines, I would put on a brand new connector. Best Regards, Larry Fisher
  8. LarryF

    Lectro SMV battery drain

    Hi Mirror, I use a toothpick to pick up a little paste from the container and use that to apply it to the screw thread. However, I will check with the factory and make sure we are still putting the same (correct) amount in the vial. It probably wouldn't break us to add a bit more. Best Regards, Larry Fisher
  9. LarryF

    New wireless TX deviation rules October '18

    Thanks for the timelime, Gordon. LEF
  10. LarryF

    Lectro SMV battery drain

    Good point Dean. Also, Wright's Silver Cream is the best and only recommended cleaner. LEF
  11. LarryF

    New wireless TX deviation rules October '18

    Correct. LEF
  12. LarryF

    Lectro SMV battery drain

    Hi Mirror, You are using too much. One vial will do 10 applications, so divide the contents accordingly. It only takes a speck to make a very thin layer. It is sufficient to clean the threads before application with a dry microfiber cloth, rubbing the male and female threads until no black residue shows up on a clean section of the microfiber towel. Then apply the 10% speck to the leading male thread. Each future battery insertion will spread the grease up and down the threads. Below is the grease that we use. There is a lot of thermal grease called silver paste on the market that contains no silver but is just silver colored. Some is called silver paste and is not electrically conductive at all. Some has carbon in it and is moderately conductive. Some is a combination of carbon and silver, if you are lucky. As usual, if it is cheap, it is probably crap that is colored silver. The 100% good stuff is below, Chemtronics CW7100: http://farnell.com//datasheets/1795243.pdf https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=CW7100 Best Regards, Larry Fisher
  13. LarryF

    New wireless TX deviation rules October '18

    As Gordon posted above: "Basically, any transmitters manufactured or sold after October 18 must not only conform with the new regulations...." Transmitters have a legal cutoff, not receivers. Best Regards, Larry Fisher
  14. LarryF

    New wireless TX deviation rules October '18

    Again, if you need re-blocking, get an appointment now. August is already filled up and we don't know what will happen in September as far as having available re-blocking slots. This is all new to us too. We've had to split our service techs into regular service people and the re-blocking crew, so re-blocking doesn't totally get in the way of repairs (much). The only good thing on the horizon is that after mid-October, the wireless world will be stable for some years, the re-blocking crew can get back to regular repairs and our service turn around time will drop back to classical Lectro levels. Best Regards, Larry Fisher
  15. LarryF

    New wireless TX deviation rules October '18

    "Kind of good for the manufacturers I guess." Actually it is pretty miserable. All current transmitters have to be re-tested and re-certified under the new standards and each frequency block is treated as a separate transmitter. This is not cheap, running into the hundreds of thousands of dollars. This is coming from our pockets now but you know where it comes from ultimately. Also, if you have older Lectro units you are intending to reblock, get an appointment NOW (caps deliberate to indicate screaming) because after September 30, Lectro will not be able (no longer legal) to reblock the previous generation units. August is already booked for reblocks and September may fill up also. If you are gnashing your teeth, remember, all this is due to big government and big money. Best Regards, Larry Fisher