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Old 26th May 2017, 5:11 pm   #9
peter_scott
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Join Date: May 2003
Location: Edinburgh, UK.
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Default Re: Baird 240 line Operation

Hi Steve,

I guess it depends on two factors, the duration & beam current required to reach maximum light output and the persistence after the beam has passed.

If we assume that there is a maximum light output or saturation and that both the Baird and EMI scans reach this value then with approximately the same number of lines scanned (240 v. 202) the EMI refresh happens twice as often and if the persistence is short relative to 20 ms then the EMI will be brighter.

Perhaps Baird used longer persistence CRTs than EMI.

Peter

Last edited by peter_scott; 26th May 2017 at 5:25 pm.
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