KF7SLM

  1. electron tubes for the transatlantic cable.

    The above name will bring up a number of sources to the Bell and British Post Office development and production of tubes for repeaters in the marine cables. I would guess that many of us who grew up with tubes seldom studied about tubes with a 20 plus year life span.

    The BPO used 3 tubes per repeater, Bell used 2. They were pentodes. The materals were refined to a point where the chance of cause of failure could not be traced to mineral content, plating, thermal expansion, or out ...
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  2. Lighting protection overview

    I found this 15 page article on one of my forums. It gives a number of considerations for protection.

    73 de KF7SLM, JIM

    "quote"
    Here's a really good article on lighting protection. Newer construction is less susceptible as PVC water pipes they use now are non-conductive so ground path to your home is quite a bit less likely.

    Also, a friend of mine is an ex-Harris installation engineer and recommends you loop all cables. Lightning doesn't ...
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  3. The Thunderbird Amateur Radio Club Fall Picnic

    Great day for a picnic. Fine location and fellowship.

    Neither Jean nor I had been to Rio Vista Community Park prior. Could not ask a for a better facility.

    Warren NU7R and Walt N7GDP were the faces seen, but sure there were others. Warren perfected a slow cook BarBQ that left the Brats and burger done, but very moist.

    Dave W7PDM and I exchanged memories of radio and TV over the last 60 plus years. Both of us have lived in Tucson and Phoenix and know many ...
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  4. Field day satellite contacts

    One very important item I omitted in my Field Day for a Nube was the satellite station.

    Rick K7TEJ was fully prepared for each pass during the contest period, but trees and operators on the bird proved contacts futile. There were only a few passes, One was around 03:00 on Sunday. Rick was going to bed as Al and I were getting up. Long night.

    As I understand, he did make contact at least once, but do to conditions they were not able to trade all the data needed to make ...
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  5. Field day for a nube

    I joined the club a few months before taking the Tech and General class. Got my tickets in November.

    I felt welcome and accepted from the start in keeping with the traditions of the ham fraternity.

    Two meter and 73 centimeter isn't all that different from my years installing and maintaining two radio systems, but HF is a whole new world.

    Field Day offered an opportunity to jump in and get wet all at once. It proved to be that and more. Jack is a gracious ...
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