Quote:
Originally Posted by tubesrule
If only Holmes and Lev had read the Television books before writing the RF Alignment engineering note for the RC-199 (RR-359A main chassis) dated June 22, 1936 
The RC-199 (RR-359A) was 2.25Mhz spacing, the initial change to RC-199B (RR-359B) was 3.25MHz, the final modifications to RC-199B was 4.5MHz. |
What is interesting is the figure 2 attachment showed the video carrier on the trailing slope of the response curve. That means the RCA engineers realized by June 1936 that economy on TV receiver design could be accomplished with less tubes by using a single sideband. Jollieffe alluded to this on his presentation the the FCC on June 15, 1936 when he suggested if a single sideband could be employed in a 6MHz channel video transmission, greater detail with less bandwidth could be employed. This suggests the RCA engineers by June 1936 knew of the possibility of single sideband delivery but had not yet figured out vestigial sideband operation. That would take another couple of years until 1939!