# 13.4.3 Receiver blocking mask elements

To create or modify a library element containing parameters of a particular blocking mask, select the **Receiver blocking masks** command from the **Library pull-down menu** or directly with **CTRL+SHIFT+B**.

A list of existing pre-defined receiver blocking mask will be selectable as shown in the figure below:

![image.png](https://wiki.cept.org/uploads/images/gallery/2026-06/scaled-1680-/02j9KJDoqO09x4AN-image.png)

<div class="rich-media-item mediaSingleView-content-wrap image-align-start css-rzxfa" data-layout="align-start" data-media-vc-wrapper="true" data-node-type="mediaSingle" data-renderer-start-pos="307" data-vc="media-single" data-width="642" data-width-type="pixel" id="bkmrk-figure-286%3A-receiver"><div class="css-yzxvlq"><div data-alt="" data-collection="contentId-493106" data-context-id="493106" data-file-mime-type="" data-file-name="file" data-file-size="1" data-height="499" data-id="3ce76513-29a0-4bcb-9828-db776f13c12d" data-node-type="media" data-renderer-start-pos="308" data-type="file" data-width="801"><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-286%3A-receiver-1" role="none"><div class="_1reo15vq _18m915vq _2rko18qm _1e0c1txw _kqswh2mm _p12f1osq _1bsb1osq _4t3i1osq _c71l1osq media-file-card-view" data-cursor="pointer" data-test-media-name="86.gif" 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/fdfa661c-d29f-4d16-979b-b6c2fcd23cab#media-blob-url=true&id=3ce76513-29a0-4bcb-9828-db776f13c12d&collection=contentId-493106&contextId=493106&width=801&height=499&alt=&clientId=113268fe-fe5b-4bc3-8ff3-07965dbf1d18)**Figure 286: Receiver blocking mask library elements**</div><div class="_kqswstnw _1bsb1osq _4t3i1osq _1e0c1txw _2lx21bp4 _1bah1h6o _4cvr1h6o align-center" data-testid="ImageRendererWrapper"></div></div></div></div></div></div>When adding a new receiver blocking mask, you need to enter the name (unique identifier) and description of its technical parameters .

**Note 1:** It is possible to quickly scroll up and down and see the differences in the blocking masks.

**Note 2:** It is possible to create a blocking mask from the workspace and export it to your library environment.

[![image.png](https://wiki.cept.org/uploads/images/gallery/2026-06/scaled-1680-/A5Vu7khfPJoLZRAO-image.png)](https://wiki.cept.org/uploads/images/gallery/2026-06/A5Vu7khfPJoLZRAO-image.png)

<div class="rich-media-item mediaSingleView-content-wrap image-align-start css-8fuvb8" data-layout="align-start" data-media-vc-wrapper="true" data-node-type="mediaSingle" data-renderer-start-pos="713" data-vc="media-single" data-width="475" data-width-type="pixel" id="bkmrk-figure-287%3A-example-"><div class="css-1lkepab"><div data-alt="" data-collection="contentId-493106" data-context-id="493106" data-file-mime-type="" data-file-name="file" data-file-size="1" data-height="117" data-id="87efcb94-4a91-4af5-acb0-245da6665dcd" data-node-type="media" data-renderer-start-pos="714" data-type="file" data-width="475"><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-287%3A-example--1" role="none"><div class="_1reo15vq _18m915vq _2rko18qm _1e0c1txw _kqswh2mm _p12f1osq _1bsb1osq _4t3i1osq _c71l1osq media-file-card-view" data-cursor="pointer" data-test-media-name="87.gif" 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/d5fcf662-3487-4e9a-b547-be236c4746b7#media-blob-url=true&id=87efcb94-4a91-4af5-acb0-245da6665dcd&collection=contentId-493106&contextId=493106&width=475&height=117&alt=&clientId=113268fe-fe5b-4bc3-8ff3-07965dbf1d18)**Figure 287: Example on how to import/export to/from the workspace/library for the receiver blocking mask**</div></div></div></div></div></div>