---
logosub: "Radiozendamateur"
language: "nl"
title: "NVIS"
date: "2024-03-09"
---

Deze [Near vertical incidence skywave antenne](https://en.wikipedia.org/wiki/Near_vertical_incidence_skywave) was voor me gemaakt door PA0ABG.

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/nvis-setup-diagram-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/nvis-setup-diagram-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/nvis-setup-diagram-w800.webp"
      alt="N V I S setup diagram"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/nvis-setup-diagram-w800.webp">
      NVIS setup diagram
    </a>
  </figcaption>
</figure>

Een [FR-4 PCB](https://en.wikipedia.org/wiki/FR-4) was gebruikt. De helft is er af geschraapt voor het design.

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/nvis-pcb-scrape-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/nvis-pcb-scrape-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/nvis-pcb-scrape-w800.webp"
      alt="N V I S P C B scrape"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/nvis-pcb-scrape-w800.webp">
      NVIS PCB schrapen
    </a>
  </figcaption>
</figure>

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/nvis-pcb-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/nvis-pcb-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/nvis-pcb-w800.webp"
      alt="N V I S P C B"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/nvis-pcb-w800.webp">
      NVIS PCB
    </a>
  </figcaption>
</figure>

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/covering-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/covering-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/covering-w800.webp"
      alt="N V I S P C B vloeibare maskering"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/covering-w800.webp">
      NVIS PCB vloeibare maskering
    </a>
  </figcaption>
</figure>

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/coax-connector-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/coax-connector-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/coax-connector-w800.webp"
      alt="N V I S coax connector"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/coax-connector-w800.webp">
      NVIS coax connector
    </a>
  </figcaption>
</figure>

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/nvis-pcb-2-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/nvis-pcb-2-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/nvis-pcb-2-w800.webp"
      alt="N V I S P C B"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/nvis-pcb-2-w800.webp">
      NVIS PCB
    </a>
  </figcaption>
</figure>

The antenne wires, coiled on a piece of pipe.

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/coils-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/coils-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/coils-w800.webp"
      alt="N V I S draadspoelen"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/coils-w800.webp">
      NVIS draadspoelen
    </a>
  </figcaption>
</figure>

## Diagrammen

Enkele 3d plotten van deze antenne op 10, 17, 20, 40 en 80 meter gemaakt met EZNEC software door PA0ABG. De antenne is het meest effectief op 20, 40 en 80 meter, waar de radiogolven naar boven gericht zijn.

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/eznec-10m-28mhz-top-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/eznec-10m-28mhz-top-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/eznec-10m-28mhz-top-w800.webp"
      alt="N V I S 10 meter 28 mega hertz diagram boven"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/eznec-10m-28mhz-top-w800.webp">
      NVIS 10 meter 28 mega hertz diagram boven
    </a>
  </figcaption>
</figure>

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/eznec-10m-28mhz-side-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/eznec-10m-28mhz-side-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/eznec-10m-28mhz-side-w800.webp"
      alt="N V I S 10 meter 28 mega hertz diagram zijkant"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/eznec-10m-28mhz-side-w800.webp">
      NVIS 10 meter 28 mega hertz diagram zijkant
    </a>
  </figcaption>
</figure>

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/eznec-17m-18mhz-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/eznec-17m-18mhz-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/eznec-17m-18mhz-w800.webp"
      alt="N V I S 17 meter 18 mega hertz diagram"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/eznec-17m-18mhz-w800.webp">
      NVIS 17 meter 18 mega hertz diagram
    </a>
  </figcaption>
</figure>

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/eznec-17m-18mhz-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/eznec-17m-18mhz-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/eznec-17m-18mhz-w800.webp"
      alt="N V I S 17 meter 18 mega hertz diagram"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/eznec-17m-18mhz-w800.webp">
      NVIS 17 meter 18 mega hertz diagram
    </a>
  </figcaption>
</figure>

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/eznec-20m-14mhz-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/eznec-20m-14mhz-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/eznec-20m-14mhz-w800.webp"
      alt="N V I S 20 meter 14 mega hertz diagram"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/eznec-20m-14mhz-w800.webp">
      NVIS 20 meter 14 mega hertz diagram
    </a>
  </figcaption>
</figure>

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/eznec-40m-7mhz-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/eznec-40m-7mhz-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/eznec-40m-7mhz-w800.webp"
      alt="N V I S 40 meter 7 mega hertz diagram"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/eznec-40m-7mhz-w800.webp">
      NVIS 40 meter 7 mega hertz diagram
    </a>
  </figcaption>
</figure>

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/eznec-80m-3.5mhz-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/eznec-80m-3.5mhz-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/eznec-80m-3.5mhz-w800.webp"
      alt="N V I S 80 meter 3.5 mega hertz diagram"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/eznec-80m-3.5mhz-w800.webp">
      NVIS 80 meter 3.5 mega hertz diagram
    </a>
  </figcaption>
</figure>

De antenne opgesteld in het veld.

<figure class="text-center">
  <picture class="d-flex justify-content-center">
    <source
      media="(max-width: 510px)"
      srcset="/images/radio/antenna/nvis/antenna-nvis-w240.webp"
    />
    <source
      media="(max-width: 850px)"
      srcset="/images/radio/antenna/nvis/antenna-nvis-w480.webp"
    />
    <img
      src="/images/radio/antenna/nvis/antenna-nvis-w800.webp"
      alt="N V I S antenne"
      class="img-fluid"
    />
  </picture>
  <figcaption class="figure-caption mt-2">
    <a href="/images/radio/antenna/nvis/antenna-nvis-w800.webp">
      NVIS antenne
    </a>
  </figcaption>
</figure>
