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en_alt:placement [2026/08/10 11:59] – Image sizes and wording (review feedback) hajoen_alt:placement [2026/08/10 14:50] (current) – Image sizing via height (?0x420) instead of computed widths hajo
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 There is also a build variant using the ''ESP32-C5-WROOM-1U'' module, which has a **u.FL connector** for an external antenna instead. Which one to pick, and which pigtail you need, is covered under [[en_alt:receivers#get_one|Get one]]. There is also a build variant using the ''ESP32-C5-WROOM-1U'' module, which has a **u.FL connector** for an external antenna instead. Which one to pick, and which pigtail you need, is covered under [[en_alt:receivers#get_one|Get one]].
  
-{{:jlcpcb_externe_antenne.png?240|The u.FL variant of the board}} +{{:jlcpcb_externe_antenne.png?0x420|The u.FL variant of the board}} 
-{{:esp32-c5-ufl.png?480|The u.FL connector on the ESP32-C5}}+{{:esp32-c5-ufl.png?0x420|The u.FL connector on the ESP32-C5}}
  
 If you do use an external antenna, **polarization matters more than gain**. We tested this with a Ubiquiti airMAX 16 dBi, on which horizontal and vertical polarization can be connected separately: If you do use an external antenna, **polarization matters more than gain**. We tested this with a Ubiquiti airMAX 16 dBi, on which horizontal and vertical polarization can be connected separately:
  
-{{:pxl_20260628_180745600.jpg?560|The Ubiquiti antenna with separate polarization connectors}}+{{:pxl_20260628_180745600.jpg?0x420|The Ubiquiti antenna with separate polarization connectors}}
  
 The test setup ran three receivers side by side: the integrated PCB antenna, the external antenna vertically polarized, and the same antenna horizontally polarized. The test setup ran three receivers side by side: the integrated PCB antenna, the external antenna vertically polarized, and the same antenna horizontally polarized.
  
-{{:pxl_20260628_180740889.jpg?560|Test setup}} +{{:pxl_20260628_180740889.jpg?0x420|Test setup}} 
-{{:pxl_20260628_180756944.jpg?560|Test setup}}+{{:pxl_20260628_180756944.jpg?0x420|Test setup}}
  
 Comparing the reception heatmaps gives a clear ranking: Comparing the reception heatmaps gives a clear ranking:
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 **Ubiquiti, vertical** **Ubiquiti, vertical**
-{{:node99.png?500|Reception heatmap, external antenna vertically polarized}}+{{:node99.png?0x420|Reception heatmap, external antenna vertically polarized}}
  
 **ESP32-C5 PCB antenna** **ESP32-C5 PCB antenna**
-{{:node98.png?500|Reception heatmap, integrated PCB antenna}}+{{:node98.png?0x420|Reception heatmap, integrated PCB antenna}}
  
 **Ubiquiti, horizontal** **Ubiquiti, horizontal**
-{{:node101.png?500|Reception heatmap, external antenna horizontally polarized}}+{{:node101.png?0x420|Reception heatmap, external antenna horizontally polarized}}
  
 The practical conclusion: unless you have a specific reason and a good antenna, keep the PCB antenna and spend the effort on mounting height instead. If you do go external, mount it vertically. The practical conclusion: unless you have a specific reason and a good antenna, keep the PCB antenna and spend the effort on mounting height instead. If you do go external, mount it vertically.
en_alt/placement.1786355997.txt.gz · Last modified: by hajo