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Updated IQ trim (markdown)

Kyle Reed 2023-09-29 14:35:52 -07:00
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IQ-trim.md

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IQ Trim allows you to trim "radio silence" from the beginning and end of a C16 or C8 capture file. IQ Trim allows you to trim "radio silence" from the beginning and end of a C16 or C8 capture file.
![IQTrim](https://github.com/eried/portapack-mayhem/assets/3761006/e83a4ca5-af1d-4aeb-918f-1df056fb3d04) ![IQTrim](https://github.com/eried/portapack-mayhem/assets/3761006/e83a4ca5-af1d-4aeb-918f-1df056fb3d04)
## UI Components
* **Capture path** - select to pick the capture file to open.
* **IQ Display** - shows the IQ file power in 240 buckets.
* **Start** - Starting sample of the trim region. Can be modified.
* **End** - Ending sample of the trim region. Can be modified.
* **Samples** - Number of samples int the capture file.
* **Max Pwr** - Power (complex magnitude) of the "strongest" samplein the capture file.
* **Cutoff** - Signal to Noise cutoff as a percentage of the Max Pwr. Can be modified.
## Trimming Files
1. Open a capture file. You should hopefully see a trimmable region in the IQ Display control.
1. If you don't see a block in the IQ Display, the capture signal was too weak for the tool.
2. Manually set Start/End or use the Cutoff % to automatically trim.
3. Press "Trim" - the file will be edited. It does not make a backup so be careful with your favorite sample files. Maybe use FileMan to make a backup first.