Wow. Do you have any more details about these LEDs? On Tue, Apr 16, 2024 at 12:19 PM Neil QQ <nei...@gmail.com> wrote:
> I do recall Krypton-85 as being one component of the gas brew. The KR85 > half-life helps explain why we sold so many replacement displays for seven > to ten year old units. As I recall, the brew included seven gases with two > of those being radioactive. The required light dynamic-range of aviation > displays is demanding. They must be readable in blinding sunlight and > barely lit at night to avoid night blindness. The gas mixture played an > important role in meeting those requirements. The details of the displays > themselves and the techniques for driving them were figured out long before > my time. > > The beginning of the end for the King panaplexes began in the late 90's. > We were down to a single supplier for the proprietary gas mixture. If I > recall correctly, that supplier was Dale Electronics (contemporarily, > Vishay) in Columbus, NE. At some point they informed us they could not > find a carrier to deliver the gas from Columbus, NE to Olathe, KS due to > new, onerous regulations for hazardous material transport. So we, King > Radio, sent in-house trucks to pick up the gas cylinders. > > One of my last great (in my head anyway) acts at King was having my crew > develop a retrofittable LED replacement module. It used bespoke, neon > hued, Nichia LED's. > > On Tuesday, April 16, 2024 at 3:29:36 AM UTC-5 Audrey wrote: > >> Indeed my point in mentioning it. >> >> On Mon, Apr 15, 2024, 6:31 PM n1ist <n1...@arrl.net> wrote: >> >>> The Kr85 mark indicates that they have (or rather now have just a >>> little, since the half life is 10.7 years) Krypton-85 mixed in the gas to >>> help with the ionization >>> >>> On Monday, April 15, 2024 at 6:09:42 PM UTC-4 Audrey wrote: >>> >>>> That's fascinating Neil, I have a few boring Bendix panaplexes and was >>>> curious about their manufacture. I believe they're marked Kr85. >>>> >>>> On Mon, Apr 15, 2024, 5:47 PM Neil QQ <nei...@gmail.com> wrote: >>>> >>>>> Until, at least, sometime in the early 2000's 90's King Radio (aka >>>>> Bendix/King) was still selling NAV and COM radios using their own numeric >>>>> panaplex type displays e.g. KX155, KX165. These displays were custom >>>>> designed and fabricated in-house in Olathe, KS. To the best of my >>>>> knowledge they were all neon orange monochrome. The gas used was a >>>>> proprietary witches brew that included several radioactive trace elements. >>>>> I recall seeing a prototype ILS indicator similar to the one referenced in >>>>> this thread. I don't believe the King display was commercialized. >>>>> >>>>> An ILS display shows deviation from the localizer (right-left >>>>> guidance) horizontally and the glideslope deviation (up-down) guidance >>>>> vertically. By "keeping the needles centered" the ILS will guide a pilot >>>>> to the runway threshold. Such displays were also used for VOR navigation >>>>> using only the right-left needles (or lit segments in this case). In the >>>>> simplest case they would provide guidance to the VOR station and identify >>>>> the cardinal radial direction that was being flown to reach the station. >>>>> When executing a simple form of an instrument landing system (ILS) the >>>>> pilot flies, at a particular altitude, along a "to" radial to find a >>>>> particular VOR station. Once directly over the VOR the pilot flies on a >>>>> specified VOR "from" radial until the localizer (right-left) and >>>>> glideslope >>>>> (up-down) needles move into the active range (no longer parked and >>>>> "flagged" at the display extremes). From there the pilot "keeps the >>>>> needles centered" until visual runway confirmation is obtained. >>>>> >>>>> On Saturday, April 13, 2024 at 11:27:41 PM UTC-5 Audrey wrote: >>>>> >>>>>> The seller is the author of this article. >>>>>> https://www.industrialalchemy.org/articleview.php?item=3247 >>>>>> >>>>>> On Fri, Apr 12, 2024 at 11:36 AM Nick Andrews <nickja...@gmail.com> >>>>>> wrote: >>>>>> >>>>>>> Never seen or heard about this one before. >>>>>>> >>>>>>> >>>>>>> https://www.ebay.com/itm/276389569367?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=AkFpft62ST6&sssrc=2047675&ssuid=9S4jfnnKS4i&widget_ver=artemis&media=COPY >>>>>>> >>>>>>> Anyone heard of this or have one? >>>>>>> >>>>>>> -- >>>>>>> >>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "neonixie-l" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>> send an email to neonixie-l+...@googlegroups.com. >>>>>>> To view this discussion on the web, visit >>>>>>> https://groups.google.com/d/msgid/neonixie-l/CAJD4P-ivW5%3DSwf_3hXWVXdad%3DYzA89swwt%3DP%2BqRK2xEMKJ%2B5Gw%40mail.gmail.com >>>>>>> <https://groups.google.com/d/msgid/neonixie-l/CAJD4P-ivW5%3DSwf_3hXWVXdad%3DYzA89swwt%3DP%2BqRK2xEMKJ%2B5Gw%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>>>> . >>>>>>> >>>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "neonixie-l" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to neonixie-l+...@googlegroups.com. >>>>> >>>> To view this discussion on the web, visit >>>>> https://groups.google.com/d/msgid/neonixie-l/42ea136c-7ed5-480f-9c29-2ba40025ac3an%40googlegroups.com >>>>> <https://groups.google.com/d/msgid/neonixie-l/42ea136c-7ed5-480f-9c29-2ba40025ac3an%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "neonixie-l" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to neonixie-l+...@googlegroups.com. >>> >> To view this discussion on the web, visit >>> https://groups.google.com/d/msgid/neonixie-l/6e423ef4-db33-49a3-b32e-a10996ee34c9n%40googlegroups.com >>> <https://groups.google.com/d/msgid/neonixie-l/6e423ef4-db33-49a3-b32e-a10996ee34c9n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to neonixie-l+unsubscr...@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/2fb48670-d192-44a2-a161-77a2e27720efn%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/2fb48670-d192-44a2-a161-77a2e27720efn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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