 Adding to DuMont 's troubles was the FCC 's 1948 " freeze " on television license applications . This was done to sort out the thousands of applications that had come streaming in , but also to rethink the allocation and technical standards laid down prior to World War II . It became clear soon after the war that 12 channels ( " channel 1 " had been removed from television broadcasting use because storms and other types of interference could severely affect the quality of signals on this channel ) were not nearly enough for national television service . What was to be a six @-@ month freeze lasted until 1952 , when the FCC opened the UHF spectrum . The FCC , however , did not require television manufacturers to include UHF capability . In order to see UHF stations , most people had to buy an expensive converter . Even then , the picture quality was marginal at best . Tied to this was a decision to restrict VHF allocations in medium- and smaller @-@ sized markets . Television sets were not required to have all @-@ channel tuning until 1964 . 
 Adding to DuMont <a href='null_genetive' title='1'><mark>'s</mark></a>troubles was the FCC <a href='null_genetive' title='2'><mark>'s</mark></a>1948 " freeze " on television license applications . This was done to sort out the thousands of applications <a href='null_relcl' title='3'><mark>that</mark></a><a href='been_done' title='4'><mark>had</mark></a> come streaming in , but also to rethink the allocation and technical standards laid down prior to World War II . It became clear soon after the war that 12 channels ( " channel 1 " <a href='been_done' title='5'><mark>had</mark></a> been removed from television broadcasting use because storms and other types of interference could severely affect the quality of signals on this channel ) <a href='negative_concord' title='6'><mark>were</mark></a> <a href='negative_concord' title='7'><mark>not</mark></a>nearly enough for national television service . What was to be a six @-@ month freeze lasted until 1952 , when the FCC opened the UHF spectrum . The FCC , however , did not require television <a href='negative_concord' title='8'><mark>manufacturers</mark></a> to include UHF capability . In order to see UHF stations , most people had to buy an expensive converter . Even then , the picture quality was marginal at best . Tied to this was a decision to restrict VHF allocations in medium- and smaller @-@ sized markets . Television sets <a href='uninflect' title='9'><mark>were</mark></a> not required to have all @-@ channel tuning until 1964 . 
Adding to DuMont  troubles was the FCC  1948 " freeze " on television license applications . This was done to sort out the thousands of applications done cum streaming in , but also to rethink da allocation and technical standards laid down prior to World War II . It became clear soon after the war that 12 channels ( " channel 1 " done been removed from television broadcasting use because storms and other types of interference could severely affect the quality of signals on this channel ) ain't nearly enough for national television service . What was to be a six @-@ month freeze lasted until 1952 , when the FCC opened the UHF spectrum . The FCC , however , did not require television no manufacturers to include UHF capability . In order to see UHF stations , most people had to buy an expensive converter . Even then , the picture quality was marginal at best . Tied to dis was a decision to restrict VHF allocations in medium- and smaller @-@ sized markets . Television sets was not required to have alll @-@ channel tuning until 1964 .