{"product_id":"ww2-wireless-set-no-19-ws19-mkiii-aerial-variometer-with-green-paint","title":"WW2 Wireless Set No. 19 WS19 MKIII Aerial Variometer With Green Paint","description":"\u003ch1\u003eWW2 Wireless Set No. 19 WS19 MKIII Aerial Variometer With Green Paint\u003c\/h1\u003e\n\u003cp\u003eThis is a very nice WW2 Wireless Set No. 19 WS19 MKIII Aerial Variometer With Green Paint.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eIn good, but slightly dusty, condition with surface scuffs and scratches commensurate with age and use. It would have been used in conjunction with the British Wireless Set No.19 Mk III (not included!)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe attached label is missing\/ badly scuffed but is marked: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWireless Set No.19\u003c\/p\u003e\n\u003cp\u003eArial Variometer Mk 3\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\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\u003eVariometers normally should be the same Mark as the Wireless Set No. 19 e.g a MkII with a MkII, however, the MkII can be used with a MkI and a MkIII with some modifications to the R29A resistor.\u003c\/p\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 href=\"https:\/\/mullardantiques.co.uk\/collections\/militaria\" target=\"_blank\"\u003e militaria\u003c\/a\u003e or \u003ca href=\"https:\/\/mullardantiques.co.uk\/collections\/radio-equipment-accessories\" target=\"_blank\"\u003evintage radio equipment.\u003c\/a\u003e\u003c\/p\u003e","brand":"British Army","offers":[{"title":"Default Title","offer_id":56607194120567,"sku":"1012","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_MKIII_Aerial_Variometer_With_Green_Paint.jpg?v=1769345726","url":"https:\/\/mullardantiques.co.uk\/en-us\/products\/ww2-wireless-set-no-19-ws19-mkiii-aerial-variometer-with-green-paint","provider":"Mullard Antiques and Collectibles","version":"1.0","type":"link"}