@Astra I agree that it won’t be fast enough to catch quick burst transmissions that are just “floating in the air”, or that one might be trying to sniff at random.
But in other cases, like the remote I have, you can just hold down the button and the signal keeps sending. In cases like what I’m trying (where it’s a generic remote with no codes printed on it) and I can keep the button depressed. A somewhat slow scan should still pick up the frequency eventually.
In the case of @zerozen original question where he knows the frequencies. Changing the Read RAW to be more configurable (allowing fine grain tuning of possible frequencies in say 1MHz or 5MHz increments) would provide a better way to capture the specific signals.