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projects:freqbuddy [2024/01/21 17:51] – Created from the form at projects:project simpel | projects:freqbuddy [2024/01/21 18:36] (current) – [Data entry] shorten description simpel | ||
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---- dataentry project ---- | ---- dataentry project ---- | ||
- | name : FreqBuddy | + | name : FreqBuddy |
- | project-owner : Simpel | + | project-owner |
- | git-url_url : @@git url@@ | + | git-url_url |
- | project-description : FreqBuddy shows you the best 8 interference-free | + | project-description : Get the best 8 interference-free frequencies (UHF) within a TV channel. |
- | project-owner : Simpel | + | project-member |
- | project-member : @@project member@@ | + | project-status_ |
- | project-status_ : in production | + | |
---- | ---- | ||
+ | |||
+ | |||
+ | |||
+ | ---- | ||
+ | |||
+ | ===== 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. | ||
+ | |||
+ | {{: | ||
+ | ==== Important note ==== | ||
+ | |||
+ | // | ||
+ | |||
+ | **Attention: | ||
+ | |||
+ | ==== Tip ==== | ||
+ | |||
+ | First use [[https:// | ||
+ | |||
+ | ==== Other functions ==== | ||
+ | |||
+ | * Click on a single frequency to show it in full screen. | ||
+ | * Click on the copy symbol (⧉) to the right of the table heading to copy the entire table to the clipboard. | ||
+ | * //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 ===== | ||
+ | |||
+ | ==== 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, | ||
+ | |||
+ | ==== Antenna spacing ==== | ||
+ | |||
+ | If the transmitter and receiver are to be operated close to each other: | ||
+ | |||
+ | * The physical distance between the antennas of the transmitter and receiver should be as large as possible. | ||
+ | * Transmitter and receiver should be at least 8 MHz (one TV channel) apart to minimize transmitter-receiver blocking. | ||
+ | |||
+ | ==== Background frequencies ==== | ||
+ | |||
+ | * A maximum of 8 frequencies are available in one TV channel. | ||
+ | * TV channels close to LTE have fewer frequencies available due to the protection gap. | ||
+ | * With decreasing frequency spacing (↓), the number of usable frequencies for these TV channels decreases again. | ||
+ | * 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 ==== | ||
+ | |||
+ | * min. 400 kHz carrier spacing | ||
+ | * 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 | ||
+ | * 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. | ||
+ |