projects:freqbuddy

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projects:freqbuddy [2024/01/21 17:28] – How it works simpelprojects:freqbuddy [2026/07/26 22:17] (current) – external edit 127.0.0.1
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-= FreqBuddy+# FreqBuddy
  
 ---- dataentry project ---- ---- dataentry project ----
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 project-owner       : Simpel project-owner       : Simpel
 git-url_url         : https://github.com/SimpelMe/freqbuddy git-url_url         : https://github.com/SimpelMe/freqbuddy
-project-description : FreqBuddy shows you the best 8 interference-free radio frequencies (UHF) within a TV channel (8 MHz grid).+project-description : Get the best 8 interference-free frequencies (UHF) within a TV channel.
 project-member      : @@project member@@ project-member      : @@project member@@
 project-status_     : in production project-status_     : in production
 ---- ----
 +
 +
  
 ---- ----
  
-===== How it works =====+##### How it works
  
 This tool calculates the best interference-free radio frequencies (UHF) within a TV channel (8 MHz grid). Only one TV channel is analyzed in isolation. Additional frequencies from other TV channels are **not** checked for compatibility. This tool calculates the best interference-free radio frequencies (UHF) within a TV channel (8 MHz grid). Only one TV channel is analyzed in isolation. Additional frequencies from other TV channels are **not** checked for compatibility.
  
-==== Important note ====+{{:projects:freqbuddy_screenshot.png?400|}} 
 +#### Important note
  
 //FreqBuddy// is designed for use in Germany. Even if the TV channels are not only used in Germany, the exclusions (radio astronomy and LTE) are adapted to German conditions. Other comments are also applied exclusively to German rules. //FreqBuddy// is designed for use in Germany. Even if the TV channels are not only used in Germany, the exclusions (radio astronomy and LTE) are adapted to German conditions. Other comments are also applied exclusively to German rules.
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 **Attention: FreqBuddy is a mathematical tool for calculating optimal frequencies. You must check for yourself whether the use of these frequencies is permitted for your application.** **Attention: FreqBuddy is a mathematical tool for calculating optimal frequencies. You must check for yourself whether the use of these frequencies is permitted for your application.**
  
-==== Tip ====+#### Tip
  
 First use [[https://fmscan.org/locsearch.php?reset=1&r=t&m=s|fmscan.org]] to find out which TV channels (column "Ch") are not or only weakly occupied by DVB-T. Completely free channels do not appear in the list and are probably a good choice. Ideally, do not use two directly adjacent TV channels. First use [[https://fmscan.org/locsearch.php?reset=1&r=t&m=s|fmscan.org]] to find out which TV channels (column "Ch") are not or only weakly occupied by DVB-T. Completely free channels do not appear in the list and are probably a good choice. Ideally, do not use two directly adjacent TV channels.
  
-==== Other functions ====+#### Other functions
  
   * Click on a single frequency to show it in full screen.   * Click on a single frequency to show it in full screen.
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   * //Cookie//: The last TV channel selected (and the frequency intervals selected in ascending or descending order) are saved in a cookie for 7 days.   * //Cookie//: The last TV channel selected (and the frequency intervals selected in ascending or descending order) are saved in a cookie for 7 days.
  
-===== Backgrounds / details =====+##### Backgrounds / details
  
-==== Frequency intervals ====+#### Frequency intervals
  
 These can be mirrored within a TV channel. By default, the spacing increases with each higher frequency (increasing - ↑). This can be reversed (descending - ↓). This is recommended, for example, for a second set of frequencies to be used simultaneously. The second set should be as far away as possible from the first and use the descending frequency spacing instead of the ascending one. These can be mirrored within a TV channel. By default, the spacing increases with each higher frequency (increasing - ↑). This can be reversed (descending - ↓). This is recommended, for example, for a second set of frequencies to be used simultaneously. The second set should be as far away as possible from the first and use the descending frequency spacing instead of the ascending one.
  
-==== Antenna spacing ====+#### Antenna spacing
  
 If the transmitter and receiver are to be operated close to each other: If the transmitter and receiver are to be operated close to each other:
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   * Transmitter and receiver should be at least 8 MHz (one TV channel) apart to minimize transmitter-receiver blocking.   * Transmitter and receiver should be at least 8 MHz (one TV channel) apart to minimize transmitter-receiver blocking.
  
-==== Background frequencies ====+#### Background frequencies
  
   * A maximum of 8 frequencies are available in one TV channel.   * A maximum of 8 frequencies are available in one TV channel.
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   * Handheld devices in the frequency range **823 - 826 MHz** may only be operated with a maximum transmission power of 82 mW.   * Handheld devices in the frequency range **823 - 826 MHz** may only be operated with a maximum transmission power of 82 mW.
  
-==== Calculation of the freedom from intermodulation ====+#### Calculation of the freedom from intermodulation
  
   * min. 400 kHz carrier spacing   * min. 400 kHz carrier spacing
   * min. 200 kHz spacing 2TX-IM(3) - 3rd order intermodulation of 2 transmitters   * min. 200 kHz spacing 2TX-IM(3) - 3rd order intermodulation of 2 transmitters
   * min. 100 kHz spacing 3TX-IM(3) - 3rd order intermodulation of 3 transmitters   * min. 100 kHz spacing 3TX-IM(3) - 3rd order intermodulation of 3 transmitters
-  * Intermodulation strength: **F1**: 54 %, **F2**: 65 %, **F3**: 49 %, **F4**: 67 %, **F5**: 81 %, **F6**: 63 %, **F7**: 82 %, **F8**: 66       % (The higher the percentage, the better the signal.)+  * Intermodulation strength: **F1**: 54 %, **F2**: 65 %, **F3**: 49 %, **F4**: 67 %, **F5**: 81 %, **F6**: 63 %, **F7**: 82 %, **F8**: 66 % (The higher the percentage, the better the signal.)
  
 The minimum requirements for intermodulation resistance are met in all cases. These values apply to the increasing frequency intervals. The order must be reversed for the descending frequency intervals. The minimum requirements for intermodulation resistance are met in all cases. These values apply to the increasing frequency intervals. The order must be reversed for the descending frequency intervals.
  
  • projects/freqbuddy.1705858121.txt.gz
  • Last modified: 2024/01/21 17:28
  • by simpel