Differences

This shows you the differences between two versions of the page.

--- en:rmds [2013/06/26 22:28] – [Necessary equipment] kaklik
+++ en:rmds [2024/04/11 13:35] (current) – [TODO] kaklik
@@ Line 3: / Line 3: @@
 RMDS01A device is the basic SDR receiver set for radio detection of meteor trails. Compared to other methods, its main advantage is in fact, that it uses software-defined receiver, that enables various advanced signal processing techniques.
+{{ :cs:designs:rmds:rmds02d_station.jpg?direct&400 |  Bolidozor RMDS02D station}}
 ====== Meteor detection using GRAVES radar ======
@@ Line 30: / Line 32: @@
 === 1/4 Ground Plane ===
-This is the basic antenna for receiving the signal reflected from ionized trails. It has an advantage in having a small size, so it can be installed on balcony, terrace etc. Its simple construction enables easy assembly and this makes it particularly suitable for beginners.
+This is the most basic antenna for receiving the signal reflected from ionized trails. It has an advantage in having a small size, so it can be installed on balcony, terrace etc. Its simple construction enables easy assembly and this makes it particularly suitable for beginners.
 The main drawback is the emitting characteristic, that has a sharp zero in zenith. This causes a poor detection of meteors flying directly over the head in comparison with conventional visual observation.
@@ Line 46: / Line 48: @@
 Other interesting experiment could include the use of two crossed dipoles over conducting plane. This would probably enable the integration of amplifier directly into the antenna and the creation of the active antenna with better noise parameters and reliability than separated assembly of GP antenna and LNA.
-The [[http://en.wikipedia.org/wiki/Discone_antenna|Discone antena]] has also been tested for receiving of the reflected signal. It works, but its high wideband characteristics causes the unwanted signals to penetrate as well.
+The [[http://en.wikipedia.org/wiki/Discone_antenna|Discone antena]] has also been tested for receiving of the reflected signal. It works, but its high wideband characteristics causes the unwanted signals to penetrate in band as well.
 ==== Preamplifier LNA01A ====
-High quality preamplifier is necessary to operate with this type of antenna due to low gain and low intensities of reflected signal.
+High quality preamplifier is necessary to operate with 1/4 Ground Plane type of antenna due to low gain and low intensities of reflected signal.
-[[http://www.mlab.cz/Modules/CommRF/LNA01A/LNA01A_Bottom_Small.JPG|LNA01A]] is preamplifier constructed for metor detection in 2m band. It contributes to amplification of the signal form antenna and so it lowers the significance of receiver's own noise. In addition to that, it also minimizes the complications connected with coaxial cable signal transmission through compensation of cable damping. It is than possible to use cheaper coaxial cable of RG58 type.
+[[http://www.mlab.cz/Modules/CommRF/LNA01A/LNA01A_Bottom_Small.JPG|LNA01A]] is preamplifier constructed for meteor detection in 2m band. It contributes to amplification of the signal form antenna and so it lowers the significance of receiver's own noise. In addition to that, it also minimizes the complications connected with coaxial cable signal transmission through compensation of cable damping. It is than possible to use cheaper coaxial cable of RG58 type.
 ==== Coaxial connectors ====
@@ Line 71: / Line 73: @@
 Software-defined receiver developed primarily for radioastronomical experiments, its characteristics are more than sufficient for meteor detection as well. For more information about the receiver see [[en:sdrx| SDRX]]
-=== Signal digitalization ===
+=== Signal digitization ===
@@ Line 142: / Line 144: @@
 ===== Detection limits =====
-The sensitivity of system has not been yet experimentally tested, because of the missing data from other sources that can be used for comparison.
+The sensitivity of system has not been yet experimentally tested, because of the missing data from other sources that can be used for comparison. Sensitivity is also affected by various signals - [[meteory rusenie]]
 ===== Frequency stability =====
@@ Line 203: / Line 206: @@
-  * To investigate the possibility of handling the Si570 directly through SpectrumLab http://www.qsl.net/d/dl4yhf///////speclab/settings.htm
+  * To investigate the possibility of handling the Si570 directly through [[http://www.qsl.net/d/dl4yhf///////speclab/settings.htm | SpectrumLab]]
-  * To create .deb instalation packet for Linux station.
+  * To create .deb installation packet for Linux station.
   * To invent diploma theses (concerning the transmitter for meteor detection)
-  * [[meteory rusenie]]
 ===== Related constructions =====