Variometer ideas

Discussion in 'The Low Bands - 630/2200 Meters - VLF' started by KL7AJ, Nov 29, 2017.

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  1. K9STH

    K9STH Ham Member QRZ Page

    ERV invented the ingredients to make dirt!

    The World War II SCR / 274N and ARC-5 transmitters had a variometer in the plate circuit of the pair of 1625 tubes.

    I have a fair number of variometers in my antique / vintage radio collection. However, all of them are of the receiving type and I would be very hesitant to use any of them for transmitting.

    Glen, K9STH
  2. KM1H

    KM1H Ham Member QRZ Page

    National Radio used a variometer variant in their receivers into the late 60's for low end of the band calibrations. Slick and no ferrite/powdered coil slugs to drift.

  3. 2E0ILY

    2E0ILY Ham Member QRZ Page

    Some of the surplus Russian variometers in series with a big loading coil allow easy DSC05730.JPG TX antenna tuning. I motorised mine as I got sick of running down stairs and outside to re tune the high Q antenna.

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