18-06-2019, 10:47 AM

T= 1/(2*BW) so with bandwidth taken as 5MHz for a 625 system T=100ns. Hence half amplitude width of a 2T pulse is 200ns. Eaxctly what Terry said.

For 405 the vision BW is usually taken as 2.5 to 3MHz. The nominal 405 BW from an Aurora would be 5 * (405/625) = 3.24MHz but this is a bit high really seeing as the sound carrier spacing is 3.5MHz. Ignoring the infamous Kell factor, 625 with 5MHz BW is about 10% deficient in H resolution compared to V. At 3MHz BW 405 would be about 17% deficient in H compared to V.

These figures are reasonable, as the effective V resolution is smaller than the nominal. This is often called the Kell factor though I don't think that usage is strictly accurate.

For 405 the vision BW is usually taken as 2.5 to 3MHz. The nominal 405 BW from an Aurora would be 5 * (405/625) = 3.24MHz but this is a bit high really seeing as the sound carrier spacing is 3.5MHz. Ignoring the infamous Kell factor, 625 with 5MHz BW is about 10% deficient in H resolution compared to V. At 3MHz BW 405 would be about 17% deficient in H compared to V.

These figures are reasonable, as the effective V resolution is smaller than the nominal. This is often called the Kell factor though I don't think that usage is strictly accurate.

www.borinsky.co.uk Jeffrey Borinsky www.becg.tv