TNAP images currently Does Not have a frequency spacing rule or requirement for transponders. Most enigma2 images require transponders with the same polarity to be spaced 2 or 4 MHZ apart.

Shown below, the MIO4K logged a transponder at 3929V and another transponder at 3930V on a blindscan of 117w. This is sort of a moot point in this case because neither transponder had channels or even a lock. But there are other transponders in the world that are spaced less than 2MHz apart that have channels or services. The Blindscan in TNAP is currently unfiltered and unregulated. Whatever is found is shown and scanned with very few exceptions. Really the only rule being it has to be a satellite transponder or at least resemble one.

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