en:antennas
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en:antennas [2019/04/17 12:18] – fluktuacia | en:antennas [2019/04/21 14:51] – [Plastic 1/4 lambda GroundPlane] fluktuacia | ||
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====== Antennas for Bolidozor network ====== | ====== Antennas for Bolidozor network ====== | ||
- | Antenna is the first signal input to a [[en: | + | Antenna is the first signal input to a [[en: |
- | * Sensitivity in the upper hemisphere with respect to observation site. | + | * Sensitivity in the upper hemisphere with respect to an observation site. |
* High efficiency. | * High efficiency. | ||
* Insensitivity to signal linear polarisation angle. | * Insensitivity to signal linear polarisation angle. | ||
- | * Suppression of unwanted | + | * Suppression of unwanted |
Line 16: | Line 16: | ||
{{: | {{: | ||
- | It represents | + | It represents |
- | A disadvantage is a low gain and a a radiation characteristic that has a sharp zero in zenith (meaning a very bad detection of meteors flying over the observation site, causing, subjectively, | + | A disadvantage is a low gain and a radiation characteristic that has a sharp zero in zenith (meaning a very bad detection of meteors flying over an observation site, causing, subjectively, |
[[en: | [[en: | ||
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==== Preamplifier LNA01A ==== | ==== Preamplifier LNA01A ==== | ||
- | Good quality preamplifier is essential due to antenna's low gain and low intensities of reflected signal. | + | A good quality preamplifier is essential due to loses during signal propagation via antenna and due to low intensities of reflected signal. |
- | [[http:// | + | [[http:// |
{{cs: | {{cs: | ||
{{cs: | {{cs: | ||
+ | Preamplifier is therefore always installed in the immediate proximity of antenna in an plastic waterproof wiring box. | ||
- | ==== Further improvements | + | ==== Modelling tools ==== |
- | Antenna should fulfil these requirements. | + | * [[http:// |
+ | * [[http:// | ||
+ | * [[https:// | ||
- | * It should have larger gain than currently used Ground Plane. | ||
- | * Radiation pattern should not reach zero at zenith. | ||
- | * It should have hemispheric radiation pattern. | ||
- | * It should be possible to integrate it with an amplifier. | ||
- | * Radiation pattern and directionality should be made adjustable via phasing of more antennas. |
en/antennas.txt · Last modified: 2019/07/13 12:27 by fluktuacia