Page Title: Misc - SDR Formula
Created: 2025-03-25 09:50:06
Current: 2025-05-01 21:58:50 UTC
When using SDR software you have to enter what frequency you want to listen to which can be confusing with conversions, so I have written the simple formula for working out the wavelength
Wavelength = Speed of Light / Frequency
Example:
We want to find the wavelength for a frequency of 1MHz
1) Convert the Frequency into Hz, in this case 1MHz is 1 Million Hz ie 1,000,000Hz
2) The speed of light is 299,792,458 metres/second
3) Divide 299792458 by 1000000 (eg 299792458 / 1000000 = 299.792458 )
Therefore the wavelength of 1MHz is 299.792458m
Hz to SDR Sharp Display including it's wavelength
This is what each frequency would look like in SDR# (SDR Sharp) software.
For example the Jurgenson Frequency of 1485kHz is 000.001.485.000
| Hz | SDR Sharp Display | Wavelength | Info |
|---|---|---|---|
| 1Hz | 000.000.000.001 | 299792458m | - |
| 10Hz | 000.000.000.010 | 29979245.8m | - |
| 100Hz | 000.000.000.100 | 2997924.58m | - |
| 1kHz | 000.000.001.000 | 299792.458m | - |
| 10kHz | 000.000.010.000 | 29979.2458m | - |
| 100kHz | 000.000.100.000 | 2997.92458m | - |
| 1MHz | 000.001.000.000 | 299.792458m | - |
| 1485MHz (1485kHz) | 000.001.485.000 | 201.880443m | Jurgenson Frequency |
| 10MHz | 000.010.000.000 | 29.9792458m | - |
| 100MHz | 000.100.000.000 | 2.99792458m | - |
| 1GHz | 001.000.000.000 | 29.979245cm | - |
| 10GHz | 010.000.000.000 | 29.97924mm | - |
| 100GHz | 100.000.000.000 | 2.99792mm | - |
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