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Amateur digital TV is often transmitted on the 70cm amateur band. Auto frequency searching using a set top box or TV will not find the signal because 70cm amateur band is not included in the search. This video shows how to manually search for a specific frequency, the procedure is similar for most receivers that allow manual search. Note, the digital signal must be present before searching. The USA and other parts of the world use 6M, 6 MHz digital bandwidth so set accordingly.