{"product_id":"ww2-wireless-set-no-19-ws19-aerial-variometer-with-base-and-grey-coating","title":"WW2 Wireless Set No. 19 WS19 Aerial Variometer With Base And Grey Coating","description":"\u003ch1\u003eWW2 Wireless Set No. 19 WS19 Aerial Variometer With Base And Grey Coating\u003c\/h1\u003e\n\u003cp\u003eThis is a very nice WW2 Wireless Set No. 19 WS19 Aerial Variometer With Base And Grey Coating.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eIn fairly good condition with surface scuffs and scratches commensurate with age and use. The glass over the scales is discoloured and the bakelite at the base has cracked.\u003c\/p\u003e\n\u003cp\u003eIt would have been used in conjunction with the British WS19: (Wireless Set No.19 not included!)\u003c\/p\u003e\n\u003cp\u003eThe Aerial Variometer was used to match a short rod aerial of 8 or 12 feet to 1\/4 wavelength in the frequency range of the Wireless Set (W.S) No. 19 (see schematic below).\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0303\/5122\/8972\/files\/Screenshot_2020-05-17_at_17.53.03_240x240.jpg?v=1589816209\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eTwo calibration scales are available 0-100 and 200-100. Both are accessible by turning the control knob on the variometer by 180 degrees for one scale and another 180 degrees for the second scale.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe 0-100 calibration is used at low bands frequencies (2-4.5 MHz). The two coils are switched in series with the addition of inductance.\u003c\/li\u003e\n\u003cli\u003eThe 200-100 Calibration is used at the higher band (4.5-8 MHz). In this configuration the coils are switched in parallel with reduced inductance). \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eFor more information \u003c\/b\u003esee L. Meulstee \u003cem\u003eWireless for the Warrier\u003c\/em\u003e pages: W.S.19-27 \u003c\/p\u003e\n\u003cp\u003ePlease click on the following links for more\u003ca rel=\"noopener noreferrer\" href=\"https:\/\/mullardantiques.co.uk\/collections\/militaria\" target=\"_blank\"\u003e militaria\u003c\/a\u003e or \u003ca rel=\"noopener noreferrer\" href=\"https:\/\/mullardantiques.co.uk\/collections\/radio-equipment-accessories\" target=\"_blank\"\u003evintage radio equipment.\u003c\/a\u003e\u003c\/p\u003e","brand":"British Military","offers":[{"title":"Default Title","offer_id":56336919134583,"sku":null,"price":119.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0303\/5122\/8972\/files\/WW2_Wireless_Set_No._19_WS19_Aerial_Variometer_With_Base_And_Grey_Coating.jpg?v=1765382563","url":"https:\/\/mullardantiques.co.uk\/en-us\/products\/ww2-wireless-set-no-19-ws19-aerial-variometer-with-base-and-grey-coating","provider":"Mullard Antiques and Collectibles","version":"1.0","type":"link"}