<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div> I think they used azimuth encoding on adjacent tracks to allow zero guard band, like what was used on some VHS formats.</div><div><br></div><div>Azimuth encoding involves slightly tilting alternate head gaps so that adjacent tracks would be unreadable due to azimuth misalignment.</div><div><br></div><div><br></div><div><div style="font-size:75%;color:#575757">Sent from my Verizon Wireless 4G LTE Smartphone</div></div> <br><br><br>-------- Original message --------<br>From: trandoc@aol.com <br>Date: 07/01/2013 4:40 AM (GMT-05:00) <br>To: quadlist@quadvideotapegroup.com <br>Subject: Re: [QuadList] QuadQuiz--Why did RCA choose 6-mil head width for Super High Band experiments <br> <br><br><font color="black" size="2" face="Arial, Helvetica, sans-serif">Ted<font size="2">,<br>
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Super High Band allowed the use of 7 1/2 IPS to achive the same S/N and needed narrow heads to avoid guard band issues. <br>
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I guess Type C doomed quad use by this time?<br>
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Harold<br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Ted Langdell <ted@quadvideotapegroup.com><br>
To: QuadList <QuadList@quadvideotapegroup.com><br>
Sent: Sun, Jun 30, 2013 4:59 pm<br>
Subject: [QuadList] QuadQuiz--Why did RCA choose 6-mil head width for Super High Band experiments<br>
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<div>What was RCA's rationale for choosing to use 6-mil heads for their experiments with Super High Band on a TR-70C?</div>
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<div>Some SMPTE members may know the answer.</div>
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<div>Bonus question: Why didn't Super High Band (or Ampex's Super High Band Pilot) get any marketplace traction.</div>
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<div>Good luck and hope your part of the country is staying relatively cool. </div>
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<div>We're at 108, our expected high for today... heading for 109 tomorrow and 111 Tuesday and Wednesday in the central Sacramento Valley of California.</div>
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<div>Is that hot enough to melt Quad Tape on the Sidewalk? The forecast says it'll be hotter than the Fourth of July.</div>
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<div style="font-size: 17px; "><font class="Apple-style-span" style="font-size: 17px; " size="3"><span class="Apple-style-span" style="font-size: 15px; ">Ted</span></font></div>
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<div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">Ted Langdell</span></font></div>
<div><span class="Apple-style-span" style="font-size: 12px; ">Secretary</span></div>
<div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">Skype: <span class="Apple-tab-span" style="white-space: pre; "> </span>TedLangdell</span></font></div>
<div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">e-mail:<span class="Apple-tab-span" style="white-space: pre; "> </span><a href="mailto:ted@quadvideotapegroup.com">ted@quadvideotapegroup.com</a></span></font></div>
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