tag:blogger.com,1999:blog-13548394340523305232024-03-13T10:56:04.199-04:00Mr. Vacuum TubeGregory L. Charvat's blog.Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.comBlogger683125tag:blogger.com,1999:blog-1354839434052330523.post-81358603847243368642021-10-27T05:00:00.000-04:002021-10-27T05:00:00.183-04:00Bonzer Mark 10 Radar Altimeter Repair and Demo<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/PqQKXJgSZSo" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-92157010314701571402021-09-22T05:00:00.000-04:002021-09-22T05:00:00.207-04:00Testing a PRC-77 backpack radio<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/XkKbSqkNNuM" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-29240536281825941472021-08-24T05:00:00.000-04:002021-08-24T05:00:00.201-04:00Western Union Self Winding Clock Co. Clock Synchronized to a GPS<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/mnDY7ecgLmw" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-31734265562063057422021-07-26T05:00:00.000-04:002021-07-26T05:00:00.329-04:00MX-138 A Radar Corner Reflector from WW2<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/Y_DQHLhWGwo" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-7832709270728489872021-06-22T05:00:00.000-04:002021-06-22T05:00:00.213-04:00Making a 'Signal Link' for 20m scratch-built SSB transceiver<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/O_XHQyaxDG4" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-7708010027457560022021-05-24T05:00:00.000-04:002021-05-24T05:00:00.232-04:00Radar Basics & Cookie Can Radar Demonstration<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="344" src="https://www.youtube.com/embed/K0RVRhf4hQA" width="459"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-34374148792585906802021-04-22T05:00:00.000-04:002021-04-22T05:00:00.286-04:00Western Electric Type 500 Telephone Intercom<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/FifMEspkGNw" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-4128114721707122392021-03-24T05:00:00.000-04:002021-03-24T05:00:00.726-04:00Congreve Clock Repair Part 2<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/TXrokGRYeIw" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-73034549324909416252021-02-23T05:00:00.000-05:002021-02-23T05:00:01.332-05:00Cantenna Radar Project<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/eqbR24qWD_s" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-56462072883003261192021-01-29T05:00:00.000-05:002021-01-29T05:00:00.161-05:00Synchronizing a Mil wrist watch to WWV using an R390A receiver<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/gkuveHylzyg" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-82032989106335079582020-12-21T05:00:00.000-05:002020-12-21T05:00:00.222-05:00Repair of a Guilford Watch Company wrist watch<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/GfVJQiR_bfg" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-57020657719764388432020-11-30T05:00:00.000-05:002020-11-30T05:00:00.429-05:00Portable Acoustic Anechoic Chamber<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/6ZxQONbbQLM" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-91398695269980175662020-10-30T05:00:00.000-04:002020-10-30T05:00:07.955-04:00Congreve Clock Repair Part 1<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/kb3extwGjjQ" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-54021837536793834422020-09-30T05:00:00.000-04:002020-09-30T05:00:00.199-04:00Time of Flight Microwave Camera<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/uxp2UQSamCs" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-7995366860998149922020-08-31T05:00:00.000-04:002020-08-31T05:00:02.855-04:00Lensless Time of Flight Microwave Camera<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/gGy-oOl9VTI" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-29748590591134357642020-07-30T05:00:00.000-04:002020-07-30T05:00:00.532-04:00Hamilton S16 Pocket Watch<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/Ffw56kWE9x8" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-79282415803317612002020-06-30T05:00:00.000-04:002020-06-30T05:00:03.914-04:00Hamilton S16 Pocket Watch<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/Ffw56kWE9x8" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-36432451001055932532020-05-29T05:00:00.000-04:002020-05-29T05:00:00.472-04:00Servicing a Waltham 15J S16 Pocket Watch<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/Zdj_DFbVKW0" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-45111957928124384672020-04-30T05:00:00.000-04:002020-04-30T05:00:01.188-04:00Servicing a Waltham Riverside Pocket Watch<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/DXHjxANzSv4" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-5550607074824003042020-03-30T05:00:00.000-04:002020-03-30T05:00:00.656-04:00Amp Hour Podcast #407 – Gregory Charvat and Three New Companies<div dir="ltr" style="text-align: left;" trbidi="on">
<div class="separator" style="clear: both; text-align: center;">
<a href="https://theamphour.com/407-gregory-charvat-and-three-new-companies/" target="_blank"><img border="0" data-original-height="728" data-original-width="1164" height="200" src="https://2.bp.blogspot.com/-qyVRRKxDcNI/XAmHofRzs0I/AAAAAAAACxo/XYuHul3W3NUw_o9Ft-snJYkkXAWgLnAIQCLcBGAs/s320/Screen%2BShot%2B2018-12-06%2Bat%2B3.33.26%2BPM.png" width="320" /></a></div>
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<div style="background-color: white; box-sizing: border-box; font-family: "Roboto Slab", serif; font-size: 16px; margin-bottom: 2.6rem; padding: 0px;">
Welcome back, <a href="https://www.linkedin.com/in/gregory-charvat-74091a1/" style="background: transparent; box-sizing: border-box; color: #c57f42; text-decoration-line: none; transition: all 0.1s ease-in-out 0s;">Dr Gregory Charvat</a>!</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 2.6rem; padding: 0px;">
<span style="font-family: "roboto slab" , serif;"><a href="https://theamphour.com/407-gregory-charvat-and-three-new-companies/">https://theamphour.com/407-gregory-charvat-and-three-new-companies/</a></span></div>
<ul style="background-color: white; box-sizing: border-box; font-family: "Roboto Slab", serif; font-size: 16px; margin: 0px 0px 2.6rem 4rem; padding: 0px;">
<li style="box-sizing: border-box; list-style-type: disc;">List of past appearances<ul style="box-sizing: border-box; margin: 0px 0px 0px 4rem; padding: 0px;">
<li style="box-sizing: border-box; list-style-type: disc;"><a href="https://theamphour.com/the-amp-hour-115-watcher-of-wraithlike-walls/" style="background: transparent; box-sizing: border-box; color: #c57f42; text-decoration-line: none; transition: all 0.1s ease-in-out 0s;">#115</a></li>
<li style="box-sizing: border-box; list-style-type: disc;"><a href="https://theamphour.com/179-greg-charvat-returns-with-a-book-laboratory-literature-laureate/" style="background: transparent; box-sizing: border-box; color: #c57f42; text-decoration-line: none; transition: all 0.1s ease-in-out 0s;">#179</a></li>
<li style="box-sizing: border-box; list-style-type: disc;"><a href="https://theamphour.com/214-impedance-matching-with-charvat-and-ossmann-recurring-rf-remontados/" style="background: transparent; box-sizing: border-box; color: #c57f42; text-decoration-line: none; transition: all 0.1s ease-in-out 0s;">#214</a></li>
</ul>
</li>
<li style="box-sizing: border-box; list-style-type: disc;">Greg was an easy hire as he’s literally the “guy who wrote the book” on the subject, <a href="https://www.amazon.com/Short-Range-Practical-Approaches-Electrical-Engineering/dp/143986599X" style="background: transparent; box-sizing: border-box; color: #c57f42; text-decoration-line: none; transition: all 0.1s ease-in-out 0s;">“Small and Short-Range Radar Systems”</a></li>
<li style="box-sizing: border-box; list-style-type: disc;">He is currently the CTO of <a href="https://www.humatics.com/" style="background: transparent; box-sizing: border-box; color: #c57f42; text-decoration-line: none; transition: all 0.1s ease-in-out 0s;">Humatics</a></li>
<li style="box-sizing: border-box; list-style-type: disc;">Greg got started with project based learning – <a href="https://ocw.mit.edu/resources/res-ll-003-build-a-small-radar-system-capable-of-sensing-range-doppler-and-synthetic-aperture-radar-imaging-january-iap-2011/" style="background: transparent; box-sizing: border-box; color: #c57f42; text-decoration-line: none; transition: all 0.1s ease-in-out 0s;">coffee can radar</a></li>
<li style="box-sizing: border-box; list-style-type: disc;">He returned and did a stint as a visiting professor with <a href="https://www.media.mit.edu/people/raskar/publications/" style="background: transparent; box-sizing: border-box; color: #c57f42; text-decoration-line: none; transition: all 0.1s ease-in-out 0s;">Ramesh Raskar</a>. They developed a camera that allows you to <a href="http://cameraculture.media.mit.edu/time-of-flight-microwave-camera/" style="background: transparent; box-sizing: border-box; color: #c57f42; text-decoration-line: none; transition: all 0.1s ease-in-out 0s;">watch microwaves propagate</a></li>
</ul>
</div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-4210857283403903802020-02-24T05:00:00.000-05:002020-02-24T05:00:05.705-05:00Sign up now, Build a Coffee Can Radar on MIT EdX<div dir="ltr" style="text-align: left;" trbidi="on">
<div class="separator" style="clear: both; text-align: center;">
<a href="https://2.bp.blogspot.com/-aYUa6cp0kjw/XAiE7QI5qvI/AAAAAAAACxc/MRkSAZ416OINtgr0zE9XvNGo1Mfjs2oPwCLcBGAs/s1600/Screen%2BShot%2B2018-12-05%2Bat%2B9.08.48%2BPM.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1014" data-original-width="1600" height="202" src="https://2.bp.blogspot.com/-aYUa6cp0kjw/XAiE7QI5qvI/AAAAAAAACxc/MRkSAZ416OINtgr0zE9XvNGo1Mfjs2oPwCLcBGAs/s320/Screen%2BShot%2B2018-12-05%2Bat%2B9.08.48%2BPM.png" width="320" /></a></div>
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<span style="background-color: white; color: #222222; font-family: Georgia, Cambria, "Times New Roman", Times, serif; font-size: 16px; font-variant-ligatures: normal; orphans: 2; widows: 2;">This is a self-paced online/lab course supplementing the ‘Intro to Radar’ series of courses which builds on several ‘build-a-radar’ courses run by the Lincoln Laboratory Technical Education Committee. Students in this course will be allotted the opportunity to build and test their own coffee can radars with primary support from fellow participants in a crowd sourced fashion. Instruction will be provided through pre-recorded lessons focusing on various fabrication and testing steps needed to build a simple, low cost radar. Students will not only build, but test, tune and experiment with the radar that they construct. Several Radar operating modes will be supported through the distribution and explanation of processing code written in Matlab. These operating modes include Doppler, ranging, and synthetic aperture radar imaging.</span><br />
<span style="background-color: white; color: #222222; font-family: Georgia, Cambria, "Times New Roman", Times, serif; font-size: 16px; font-variant-ligatures: normal; orphans: 2; widows: 2;"><br /></span>
<span style="background-color: white; color: #222222; font-family: Georgia, Cambria, "Times New Roman", Times, serif; font-size: 16px; font-variant-ligatures: normal; orphans: 2; widows: 2;"><span style="font-variant-ligatures: normal;">Participants do not have to be radar engineers but it helps to have at least a bachelor’s degree in electrical engineering or physics and interest in any of the following: electronics, electromagnetics, signal processing, physics, or amateur radio. It is recommended that you have some familiarity with MATLAB. Each participant is required to bring a laptop (with a stereo-audio input) with MATLAB installed as this will be used for data acquisition and signal processing.</span></span><br />
<span style="background-color: white; color: #222222; font-family: Georgia, Cambria, "Times New Roman", Times, serif; font-size: 16px; font-variant-ligatures: normal; orphans: 2; widows: 2;"><span style="font-variant-ligatures: normal;"><br /></span></span>
<span style="background-color: white; color: #222222; font-family: Georgia, Cambria, "Times New Roman", Times, serif; font-size: 16px; font-variant-ligatures: normal; orphans: 2; widows: 2;"><span style="font-variant-ligatures: normal;">Sign up here:</span></span><br />
<span style="background-color: white; color: #222222; font-family: Georgia, Cambria, "Times New Roman", Times, serif; font-size: 16px; font-variant-ligatures: normal; orphans: 2; widows: 2;"><span style="font-variant-ligatures: normal;"><a href="https://llx-bwsix.mit.edu/courses/course-v1:MITLL+LLX01+Summer_2017/about">https://llx-bwsix.mit.edu/courses/course-v1:MITLL+LLX01+Summer_2017/about</a></span></span></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-24563251810459276012020-01-23T05:00:00.000-05:002020-01-23T05:00:03.952-05:00Servicing a flapper-era 1920s Waltham hexagonal pocket watch<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/bXfrcWDuEfc" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-26183833438334669992019-12-18T05:00:00.000-05:002019-12-18T05:00:00.272-05:00Servicing a Waltham size 18 model 1883 pocket watch<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/_AclXtdOqAI" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-7901385373076108112019-11-25T05:00:00.000-05:002019-11-25T05:00:02.289-05:00Servicing a ladies Elgin pocket watch<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/XdsQBIvTNfU" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0tag:blogger.com,1999:blog-1354839434052330523.post-16317881201217253212019-10-22T05:00:00.000-04:002019-10-22T05:00:09.500-04:00Servicing a Hampden Watch Co Pocket Watch<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe allowfullscreen="" frameborder="0" height="270" src="https://www.youtube.com/embed/F_bNDz8Mx-4" width="480"></iframe></div>
Gregory L. Charvathttp://www.blogger.com/profile/16123672550243971371noreply@blogger.com0