View Single Post
Old 5th Oct 2013, 12:29 am   #43
emeritus
Dekatron
 
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,316
Default Re: 405-Line VHF Aerials in 2013

re #35, contemporary trade leaflets indicate that the Antiference Antex was introduced in 1949. An Antiference leaflet refers to it having been in use for 2 years before the 1951 Festival of Britain, and a provisional patent application was also filed in 1949.

The Dublex may have been designed to get around the Antiference Patents. The (undated, probably circa 1952) Aerialite leaflet says that a patent was applied for the Dublex design. While Aerialite did have three patents granted around 1950, none relate to the Dublex configuration. At that time, only patents that were accepted were published, so possibly their application relating to the Dublex was abandoned or refused. I have another Aerialite leaflet, also undated, that mentions a "Unex X-shaped aerial", as well as the Dublex X-shaped : no illustration unfortunately, but the Unex was less sensitive (50 miles) that the Dublex (65 miles).
Attached Files
File Type: pdf Antiference circa 1952.pdf (1.22 MB, 624 views)
File Type: pdf Aerialite ca 1952.pdf (597.2 KB, 417 views)
File Type: pdf Aerialite circa 1952.pdf (1.43 MB, 436 views)
emeritus is offline   Reply With Quote