A couple of websites with 630-meter / 2200-meter information

Discussion in 'The Low Bands - 630/2200 Meters - VLF' started by K9STH, Nov 10, 2017.

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  1. WQ2H

    WQ2H QRZ Lifetime Member #214 Platinum Subscriber Life Member QRZ Page

    Maybe you folks have already seen this, but if you're going to build a variometer for a short Marconi - these will definitely help:

    My advice is to keep an eye on the "hot-side" variometer voltage (depending of configuration this could easily breech 10kV). This will give you an idea of what kind of isolation you'll need for anything connected to the antenna element(s).

    http://people.physics.anu.edu.au/~dxt103/calculators/marconi.php (The VK1SV Marconi Antenna calculator)

    https://www.qsl.net/in3otd/variodes.html (IN3OTD's Variometer Design)


    http://www.66pacific.com/calculators/coil-inductance-calculator.aspx (66Pacific.com Coil Inductance Calculator)

    137.385 kHz (just below WSPR) is kind of the informal JT9 meeting place in New England. Be prepared to use JT9-1, 2, 5, or 10. You can easily tell which is in use by observing the time domain in a waterfall.

    Good luck lowfers !

    73
    Jim, WQ2H
     
    KA0HCP likes this.
  2. 2E0ILY

    2E0ILY Ham Member QRZ Page

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