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HealthKit SA-2500 Tuner Schematic Needed!

Discussion in '"Boat Anchor" & Classic Equipment' started by KE8UW, Oct 16, 2021.

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  1. KE8UW

    KE8UW Ham Member QRZ Page

    I built this SA-2500 a long time ago. Have the manual and found the assembly prints on line. No schematic. Troubleshooting this beast will be very difficult without the schematic. Have not been able to find it on line. Any help is appreciated.
     
  2. W9GB

    W9GB Ham Member QRZ Page

    ASK ManualMan, IF they have the Schematics and PC Board Layouts
    https://www.manualman.com/index.cfm...bfe35eea5-5E83076E-F74F-D6CA-4087C05AA27307E8

    Heathkit reentered the Antenna Tuner market with the SA-2040 antenna tuner.
    The SA-2040 originally sold for $149.95, a price it held for about two years during an inflation- ary period. By the fall of 1981 the price rose to $154.95 and by the winter of 1982/1983 it reached $169.95. It was no longer offered in the fall 1983 catalog.

    Heathkit offered two other full legal-limit antenna tuners, the SA-2060 (followed by an ‘A’ version) and the SA-2500 automatic tuner. The original SA-2060 was offered starting in 1981 and sold alongside the SA-2040 for a couple of years. These tuners may be covered in a future HotM article.

    The SA-2040 is a clone of Lewis McCoy, W1ICP (sk) Ultimate Transmatch (July 1970 QST, page 24). The SA-2040 is capable of tuning into loads with an SWR as high as 10:13, though Heath specified its matching output impedance only as “wide-range”. Specifications are shown in Table I.

    Heathkit of the Month #97 - SA 2040 Antenna Tuner
    by Bob Eckweiler, AF6C
    January 2020
    Heathkit SA-2040 Antenna Tuner
    https://www.w6ze.org/Heathkit/Heathkit_097_SA2040 Tuner.pdf
    ==
    James Garland, W8ZR covered E-Z Tuner construction in 2002 QST articles, an automatic version of McCoy’s design with 21st century components (2000-2004 era).
    http://www.w8zr.net/eztuner/
    ==
    Tuner Transformation
    by Peter Ferrand
    73 Magazine, April 1987, pages 46-47
    https://www.nostalgickitscentral.com/heath/73-index/articles/SA-2500-4-87.pdf

    “While the Manual does not specify it, communications with Heath engineers indicate that the gray multi-conductor cable coming from the sensor assembly should be dressed AWAY from the air variable capacitors and placed FLAT against the Rear Panel.
    OTHERWISE, due to the high voltages present, an Arc can develop between the capacitor and the cable — leading to Disastrous Results.”
    ==
    QRZ Technical Forum Thread (2016)
    https://forums.qrz.com/index.php?threads/heathkit-sa-2500-auto-tuner.515169/
    ==
    PHOTOS by KC8RP
    Did not stay in his collection (did not like this Heath design)
    https://www.pestingers.net/pages-images/heathkit/radio-equipment/sa2500/sa2500.htm
     
    Last edited: Oct 16, 2021

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