[amsat-bb] Can anyone explain these calls?

["Mr Jeffrey L Ross" <radiooperator@xxxxxxxxxxx>]

Hi folks, heres the calls out of my heard list, anyone know what the pacb-1, 
pacbls-8 are?
I think there from ao-51 but see it  has pecho-11,pecho-1.
4XTECH-11

........ 4XTECH-12

........ PECHO-11

........ PACB-1

........ PECHO-12

........ PACBLS-8

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