BI9BUM If there's a fixed frequency peak, it's equivalent to having a carrier signal. For example, various FSK systems work fine when measured with an FNJ direction finder from SDR.
Additionally, when dealing with very wide frequency ranges, it's important to consider potential interference. You might try adjusting the frequency slightly to see if you can find a more stable baseline frequency. Generally, frequencies in the range of 400 to 510 MHz are used.
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