{"product_id":"unknown-rt-7-apn-1-frequency-modulated-altimeter","title":"Unknown RT- 7 \/ APN-1 - Frequency-Modulated Altimeter","description":"\u003cp\u003e\u003cbr\u003e\u003cbr\u003eFor sale: Military RT- 7 \/ APN-1 - Frequency-Modulated Altimeter \u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePlease ask a shipping quote for the exact shipping costs.\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e \u003c\/p\u003e\u003cbr\u003e\u003cp\u003eThis FM-modulated radio altimeter was designed by RCA and became operative in 1943, during\u003cbr\u003e\u003cbr\u003eWWII. It is described in Volume II, ‘Radar Aids to Navigation’, of the MIT Radiation Lab. Series,\u003cbr\u003e\u003cbr\u003e1947. Basically the transmitter frequency sweeps continuously between 420 and 400 MHz.\u003cbr\u003e\u003cbr\u003eDepending upon the selected range, 400 or 4.000 feet, sweep rate can be 40 or 4 MHz per second.\u003cbr\u003e\u003cbr\u003eDue to the delay introduced by the path from the transmitting antenna to ground and back to the\u003cbr\u003e\u003cbr\u003ereceiving antenna, the altitude information is obtained directly comparing the frequency difference between the transmitter and the receiver.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e27v DC\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e\u003cbr\u003e\u003cbr\u003eSee pictures for more details.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003eUntested due to not having the right equipment, therefore sold for parts or in not working condition.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003eDimensions (LxWxH): 46x20x18cm\u003cbr\u003e\u003cbr\u003eWeight: 6,8Kg\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003eWe ship worldwide.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e-Shipping in the EU up to 30 KG (max)\u003cbr\u003e\u003cbr\u003e-Shipping outside of the EU up to 20 KG (max)\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003ePlease note: ‘’Whenever an item exceeds the weight noted above. Please ask for a shipping quote before making a purchase. The shipping costs are estimated in our shop because we do not know the shipping address.\u003c\/p\u003e","brand":"Unknown","offers":[{"title":"Default Title","offer_id":57350125912408,"sku":"HEN-ZV-15-6171","price":119.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0944\/1987\/8232\/files\/unknown-rt-7-apn-1-frequency-modulated-altimeter-hen-60e59b00bda9f.jpg?v=1779882391","url":"https:\/\/www.odnd.nl\/products\/unknown-rt-7-apn-1-frequency-modulated-altimeter","provider":"ODND Vintage Audio Dreams","version":"1.0","type":"link"}