<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">When I was at college, I earned extra cash by babysitting the KDNT AM transmitter site from pre-sunrise sign-on till after sunrise when I changed antenna patterns and transmitter power. I had my First Phone and could use the cash, so I was game.<div><br></div><div>There was so much RF in the transmitter shack that I could not sit in the folding metal chair less my lower extremities would start burning.</div><div><br></div><div>In regard to nitrate, I don't think there would be enough energy in the RF field to cause an issue unless the material was right up next to the antenna. RF experts can chime in on the ratio of RF energy verses distance from the radiation source (it drops off quite rapidly).</div><div><br></div><div>Regards,</div><div><div><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-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: 0px; "><div><div style="font-size: medium; font-family: Helvetica; font-weight: normal; font-style: normal; "><font class="Apple-style-span"><br>David Crosthwait<br>DC Video<br></font></div><div>Preservation Level Videotape Transfers and More!<br><font class="Apple-style-span" size="2" style="font-family: Helvetica; font-weight: normal; font-style: normal; "><br></font><font class="Apple-style-span" style="font-size: 8px;"><a href="mailto:david@dcvideo.com">david@dcvideo.com</a><br><a href="http://dcvideo.com/">http://dcvideo.com/</a><br>Follow DC Video on Facebook: <a href="https://www.facebook.com/dcvideo">https://www.facebook.com/dcvideo</a></font></div><font class="Apple-style-span" style="font-size: 8px;">Follow DC Video on YouTube: <a href="http://www.youtube.com/user/dcvideoonline">http://www.youtube.com/user/dcvideoonline</a><br></font></div><div style="font-family: Helvetica; font-weight: normal; font-style: normal; font-size: medium; "><br></div></span><br class="Apple-interchange-newline">
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<br><div><div>On Mar 1, 2016, at 1:03 PM, Johan Glas via QuadList wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><br><br><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(127, 127, 127, 1.0);"><b>From: </b></span><span style="font-family:'Helvetica'; font-size:medium;">Johan Glas <<a href="mailto:trippedoverabox@gmail.com">trippedoverabox@gmail.com</a>><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(127, 127, 127, 1.0);"><b>Date: </b></span><span style="font-family:'Helvetica'; font-size:medium;">March 1, 2016 1:02:47 PM PST<br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(127, 127, 127, 1.0);"><b>To: </b></span><span style="font-family:'Helvetica'; font-size:medium;">Quad List <<a href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</a>><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(127, 127, 127, 1.0);"><b>Subject: </b></span><span style="font-family:'Helvetica'; font-size:medium;"><b>Re: [QuadList] An O/T but interesting topic--nitrate film of all built on top of high-power AM antenna radials--Safe?</b><br></span></div><br><br><p dir="ltr">Nitrate is very dangerous burning, but try to start the fire, not easy. The danger here pointed out seems minor to zero to me. </p><p dir="ltr">Johan Glas, the Netherlands</p>
<div class="gmail_quote">Op 1 mrt. 2016 20:58 schreef "Ted Langdell via QuadList" <<a href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</a>>:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
<br><br>---------- Forwarded message ----------<br>From: Ted Langdell <<a href="mailto:Ted@quadvideotapegroup.com">Ted@quadvideotapegroup.com</a>><br>To: Peter Ford <<a href="mailto:pford@windowslive.com">pford@windowslive.com</a>><br>Cc: "<<a href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</a>>" <<a href="mailto:quadlist@quadvideotapegroup.com">quadlist@quadvideotapegroup.com</a>><br>Date: Tue, 1 Mar 2016 11:58:14 -0800<br>Subject: Re: An O/T but interesting topic--nitrate film of all built on top of high-power AM antenna radials--Safe?<br><div dir="auto"><div>Hi Peter,<br><br>Film cans as RF powered heaters. Hmmm. </div><div><br></div><div>There's at least one member of the group that might have a thought. I've forwarded this to him and he may reply either directly or through the group. </div><div><br></div><div>Perhaps someone should be going into more than one of the vaults and doing some measurements with appropriate equipment?<br><br>If the building is concrete and made with any kind of wire mesh in the concrete, is it possibly acting as a Faraday cage?</div><div><br></div><div>Is there any plan to rebuild the taller antenna using the same antenna base, Et Cetera?</div><div><br></div><div>When you have a chance, please feel free to share any stories about your use of the AVR-1 and other machines. </div><div><br></div><div>Pictures that add to the story and don't take the message above one megabyte total will pass through the Mail system without a problem.<br><br>Otherwise, I get a message that says I need to take a look and approve large files.<br><br>Thanks again for an interesting subject.</div><div><br></div><div><br></div><div></div><div></div><div><br><div><span style="background-color:rgba(255,255,255,0)">Ted</span></div><div><span style="background-color:rgba(255,255,255,0)"><br></span></div><div><span style="background-color:rgba(255,255,255,0)">Ted Langdell</span></div><div><span style="background-color:rgba(255,255,255,0)">Secretary, Quad Videotape Group</span></div><div><span style="background-color:rgba(255,255,255,0)"><a href="mailto:Ted@quadvideotapegroup.com" target="_blank">Ted@quadvideotapegroup.com</a></span></div><div><span style="background-color:rgba(255,255,255,0)"><a href="tel:%28530%29301-2931" value="+15303012931" target="_blank">(530)301-2931</a></span></div><div><br></div><span style="background-color:rgba(255,255,255,0)">Dictated into and Sent from my iPhone, which is solely responsible for any weird stuff I didn't catch.</span><br><div><span style="background-color:rgba(255,255,255,0)"><br></span></div></div><div><br>On Mar 1, 2016, at 11:25 AM, Peter Ford <<a href="mailto:pford@windowslive.com" target="_blank">pford@windowslive.com</a>> wrote:<br><br></div><blockquote type="cite"><div>
<div dir="ltr">
<div style="FONT-SIZE:12pt;FONT-FAMILY:'Calibri';COLOR:#000000">
<div>This is off topic, but members of the group may be able to help with advice
as many of you have backgrounds in Radio and Television Broadcasting.</div>
<div> </div>
<div>A Film and Tape Audio-Visual Archive (where I have previously carried out
quad restoration work using an AVR1 - the connection?) is not permitted to store
Videotape/Safety Film and Nitro-Cellulose (Nitrate) film in the same
building. Except for very small quantities undergoing restoration the bulk
of the Nitrate Film collection had to be stored in disused ammunition bunkers in
an isolated spot in the countryside.</div>
<div> </div>
<div>About two years ago this Archive and the Government Archive combined their
Nitrate Film Collections in a brand new purpose built climate controlled secure
vault in a secret location. Very commendable - but I have found the
location and I see there may be a big problem.</div>
<div> </div>
<div>About 40 Km from the city centre is an AM Radio Transmission site.
There are five transmitters with a combined output of about 150 KW. They
had two masts one 220 meters high and the other 137 meters. However
recently the 220 meter mast was discovered to have a corrosion problem and was
dropped with explosives. It was this activity that drew my attention to
the site. To my surprise I found the new Nitrate Film vault.
It had been built here over the top of the ground radials for the 220 meter mast
and 0.5 km from the 137 meter mast.</div>
<div> </div>
<div>Nitrate Film is extremely flammable....it has almost the same composition
as Nitro-Glycerine a very hot burning explosive (5000 degrees C). Having a
large quantity of this stuff located in a very strong RF electromagnetic field
is asking for trouble. The films are in individual metal containers
stacked 8 high on painted metal shelving. My theory is each stack of 8
cans will be acting as an aerial and there will be a large RF potential
difference between the bottom of the stacks and the shelving. This is an
ignition or detonation source only being suppressed by a thin layer of
paint. Because the transmitters run 24/7 if an arc starts it will not
stop.</div>
<div> </div>
<div>I spoke to the local council about the danger. They assured me the
vault has a 4 hour fire rating therefore complied with regulations.</div>
<div> </div>
<div>Anyone agree with me this is a very dangerous
situation?</div></div></div>
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