As a general rule, I use "all frequencies" if they will fit into the TSYS definition to avoid missing control channels which aren't flagged in the RR database. Otherwise, I'll use "primary CCs and Alt" followed by "primary CCs only".
I don't think it slows anything but the initial CC acquisition to have all the frequencies in the TSYS. I know having all frequencies present saved me a couple of times on my Pro-96 because the database hasn't always had accurate CC information on some systems.
Mark J.
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