IARS

The September meeting of the IARS will feature a technical Topic talk by Gil McPherson, on the Barlow Wardley receiver, and the wardley loop.

Gil VK2ZGE will display his 137KHz wardley loop receiver and provide a technical discussion on this precise non drift oscillator circuit.

During WW2, while working on a wavemeter project a “Dr Trevor Wadley” developed a unique circuit for canceling frequency drift, a circuit later to be known as the Wadley Loop.   The first well known implementation of Wadley’s Loop was during the 1950′s in the development of the Racal RA-17 receiver. The RA-17 and later RA-117 where quite unique devices, gaining extensive use by the British military from the late 1950′s and through the 60′s, in fact the 117 made it into the early 70′s.   The circuit was well known to the Amateur radio fraternity during this era, with top shelf amateur receivers such as Yaesu (FRG-7), Drake (SSR-1) and Realistic (DX-300) receivers employing this circuit idea.

Come along to the meeting and have a look at Gil’s home brew 137KHz receiver.   The meeting will be held at the usual venue, The Visitors Centre, Industry World Centre, Springhill Road, Coniston.   This is only a short distance form the Wollongong CBD.   The meeting starts at 7.30pm Next Tuesday 12th September, coffee is provided free.   All welcome, see you there.   Follow this link for a road map to the venue.

For additional information contact, the secretary, vk2vvv