# Introduction

It can be the <span data-highlighted="true" data-vc="highlighted-text"><span class="_kqswh2mm"><span class="_5pioz8co _189e1dm9 _1il9buyh _19lc184f _d0altlke" data-testid="definition-highlighter">ILT</span></span></span> or the <span data-highlighted="true" data-vc="highlighted-text"><span class="_kqswh2mm"><span class="_5pioz8co _189e1dm9 _1il9buyh _19lc184f _d0altlke" data-testid="definition-highlighter">VLT</span></span></span> as illustrated in Figure 146.

![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/515ozsVfn8w77DbO-image.png)

<div class="fabric-editor-block-mark fabric-editor-alignment align-center" data-align="center" id="bkmrk-figure-146%3A-transmit">**Figure 146: Transmitter illustration as <span data-highlighted="true" data-vc="highlighted-text">ILT</span> or <span data-highlighted="true" data-vc="highlighted-text">VLT</span>**</div>It consists in 4 panels (Figure 147); Transmitter identification, antenna pointing, antenna patterns identification, emission characteristics.

![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/q3uhDWZpYhTyhLHi-image.png)

<div class="rich-media-item mediaSingleView-content-wrap image-align-start css-1w64z13" data-layout="align-start" data-media-vc-wrapper="true" data-node-type="mediaSingle" data-renderer-start-pos="265" data-vc="media-single" data-width="513" data-width-type="pixel" id="bkmrk-figure-147%3A-transmit"><div class="css-1d29ihs"><div data-alt="" data-collection="contentId-512118" data-context-id="512118" data-file-mime-type="" data-file-name="file" data-file-size="1" data-height="557" data-id="73fa5129-d504-454b-a803-336e456be22d" data-node-type="media" data-renderer-start-pos="266" data-type="file" data-width="1143"><div class="_2rko18qm _vchhusvi _kqswh2mm _ect4ttxp _p12f1osq _c71l1osq _1bsb1qmm _4t3ine4n _1hlmd0i9 _1rquusvi _eg541i5c _mts3kb7n _1ntskb7n _yfmhtlke _5sb1v00u new-file-experience-wrapper" data-media-vc-wrapper="true" data-testid="media-card-view" id="bkmrk-figure-147%3A-transmit-1"><div class="_1reo15vq _18m915vq _2rko18qm _1e0c1txw _kqswh2mm _p12f1osq _1bsb1osq _4t3i1osq _c71l1osq media-file-card-view" data-cursor="pointer" data-test-media-name="47.png" data-test-progress="1" data-test-source="remote" data-test-status="complete" data-testid="media-file-card-view"><div class="_kqswstnw _1bsb1osq _4t3i1osq _1e0c1txw _2lx21bp4 _1bah1h6o _4cvr1h6o align-center" data-testid="ImageRendererWrapper">![](blob:https://ecowiki.atlassian.net/a7067a04-09ad-4825-a256-7ff31a64ffb4#media-blob-url=true&id=73fa5129-d504-454b-a803-336e456be22d&collection=contentId-512118&contextId=512118&width=1143&height=557&alt=&clientId=113268fe-fe5b-4bc3-8ff3-07965dbf1d18)**Figure 147: Transmitter GUI**</div></div></div></div></div></div>