<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Hi, Kevin,</div><div><br></div><div><div>On Apr 9, 2010, at 7:11 PM, Kevin InTexas wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hello<div><br></div><div>Did Quadruplex tape (as used by NBC TV in 1960s) record signals progressive or interlaced?</div><div><br></div><div>Thanks!</div></blockquote><div><br></div></div><div>Welcome to the list. Feel free to tell us a little about yourself. </div><div><br></div><div>Re: Your question--</div><div><br></div>Like all broadcast television signals, what was recorded on Quad tape was interlaced. <div><br></div><div>In the US and other countries sharing what became the NTSC standard, 525 lines at 29.97 frames per second in two fields.</div><div><br></div><div>The UK had 405/25 monochrome and then 625/25 PAL machines.</div><div><br><div><br><div><div><br></div></div><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Ted Langdell</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Secretary</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" color="#0018ea" style="font: normal normal normal 12px/normal Helvetica; color: rgb(0, 24, 234); "></font></div></div></div></span> </div><br></div></div></body></html>