{"product_id":"wwii-us-navy-obn-transmitter-monitor-oscilloscope-manual-navships-900429-1945","title":"WWII US Navy OBN Transmitter Monitor Oscilloscope Manual NAVSHIPS 900429 1945","description":"\u003cp\u003e\u003cspan\u003eOriginal World War II \u003c\/span\u003e\u003cspan\u003eU.S. Navy Bureau of Ships instruction book\u003c\/span\u003e\u003cspan\u003e for the \u003c\/span\u003e\u003cspan\u003eTransmitter Monitor Oscilloscope, Navy Model OBN\u003c\/span\u003e\u003cspan\u003e, manufactured by \u003c\/span\u003e\u003cspan\u003eAllen B. Du Mont Laboratories, Inc.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePublished as \u003c\/span\u003e\u003cspan\u003eNAVSHIPS 900,429\u003c\/span\u003e\u003cspan\u003e and approved \u003c\/span\u003e\u003cspan\u003eMay 21, 1945\u003c\/span\u003e\u003cspan\u003e, this technical manual covers the description, installation, adjustment, operation, and maintenance of the OBN transmitter-monitoring oscilloscope. The contents include pulse-shape interpretation, frequency-drift monitoring, crystal oscillator circuits, sweep controls, voltage regulation, installation procedures, and connections to Navy transmitter equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe manual retains its original screw-post binder. The former \u003c\/span\u003e\u003cspan\u003e“Confidential—Non-Registered”\u003c\/span\u003e\u003cspan\u003e classification is crossed out and accompanied by handwritten declassification markings, adding historical interest.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDetails\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eTitle:\u003c\/span\u003e\u003cspan\u003e Instruction Book for Transmitter Monitor Oscilloscope Navy Model OBN\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003ePublication:\u003c\/span\u003e\u003cspan\u003e NAVSHIPS 900,429\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eBranch:\u003c\/span\u003e\u003cspan\u003e U.S. Navy, Bureau of Ships\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eManufacturer:\u003c\/span\u003e\u003cspan\u003e Allen B. Du Mont Laboratories, Inc., Passaic, New Jersey\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eContract:\u003c\/span\u003e\u003cspan\u003e NXsr 37599\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eApproval date:\u003c\/span\u003e\u003cspan\u003e May 21, 1945\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eEra:\u003c\/span\u003e\u003cspan\u003e World War II\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eBinding:\u003c\/span\u003e\u003cspan\u003e Original screw-post technical-manual binder\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eFormer classification:\u003c\/span\u003e\u003cspan\u003e Confidential, Non-Registered; visibly canceled\/declassified\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eFREE SHIPPING\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e#5\u003c\/span\u003e\u003c\/p\u003e","brand":"Whiskey Rebellion Antiques","offers":[{"title":"Default Title","offer_id":43322087309389,"sku":null,"price":70.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0610\/9229\/8829\/files\/IMG-1037.heic?v=1785259988","url":"https:\/\/whiskeyrebellionantiques.com\/products\/wwii-us-navy-obn-transmitter-monitor-oscilloscope-manual-navships-900429-1945","provider":"Whiskey Rebellion Antiques","version":"1.0","type":"link"}