Track Movement of Milky Way With Amateur Radio Telescope

Discussion in 'Amateur Radio News' started by W0PV, Oct 2, 2019.

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  1. W7SJP

    W7SJP Ham Member QRZ Page

    A most excellent article John--thanks for the link! 73
  2. WB1BQE

    WB1BQE Ham Member QRZ Page

    The gods must have spoken to me directly on this one - I already had the exact SDR enroute from Amazon when I tripped across this article. (I also do astrophotography, and this looks like it would mount nicely on an AVX! )

    My question is whether anybody knows approximately what the gain of the homebrew horn shown in this article is? (And would something circularly polarized such as a Helix yield a better result? (Sorry for my ignorance - up to now, "Microwaves" to me meant getting on the local 70cm repeater... :)

  3. W0PV

    W0PV Ham Member QRZ Page

    Al, in the fifth paragraph of the linked article cited in the OP the author Dave N2LVD stated, "An online calculator showed that a horn of those dimensions would have a respectable directional gain of 17 decibels."

    73. John, WØPV

    PS - I momentarily stopped making QSO's in CW Sweepstakes just to answer this question :p
  4. WB1BQE

    WB1BQE Ham Member QRZ Page

    Sorry - I worded my question poorly. I was wondering how close something like that could get to the theoretical gain, given some amount of mechanical imperfection. (And in the case of my antennas, Substantial mechanical imperfections... :) )
  5. K1FQL

    K1FQL XML Subscriber QRZ Page

    When I looked for the dongle and the gizmo, I found that the link in the IEEE online article takes us to the Nooelec device that does not have a bias-T. The dongle with a bias-T provides an easy way to provide DC power to the gizmo via the gizmo output SMA connector. I posted the correct link in the comment section of the online article.
    I hope that this will help those who want to work on this project.
    WB1BQE likes this.

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