01_LW
Trevor Watkins became interested in wireless about 1920.
He initially held the licence T336.
This "loose coupler" receiver was for long wave reception.

02_A7AAcard
Trevor obtained the call 7AA in 1922.
When international communication became possible, it became necessary to add letters to identify the countries, hence the "A" for Australia.

03_7DX_1926
When the PMG required the call 7AA, Trevor changed to 7DX.
This shows the equipment he used in the Trans-Pacific Tests of 1926.

04_7DX_1926
Trevor's note from the back of the above photo.

05_Palais_1923
Some of the equipment used at the Palais de Dance in late 1923, where the WIA demonstrated music by wireless.   Miss Dalton and the Gaiety Orchestra played in the WIA's clubrooms, half a mile from the Palais in the City Hall.

06_7AU
Before broadcast licences were available, everybody was an experimenter.
This receiver belonged to Jesse Slater, 7AU, in Sheffield.

07_7LJ_1926
Lon Jensen, 7LJ, Devonport, 1926.   Lon was a schoolteacher who encouraged many others to take up amateur radio.

08_7LJ_Key
Lon's key to the above photo.

09_7LJ_1930
By 1930, the style of the equipment had changed, as shown by another photo from 7LJ.

10_7BQ
Len Crooks, 7BQ, was a leading amateur in Launceston.

11_A7CW
Crosby Walch, 7CW, was in Hobart.
Note that the prefix for Australia has changed to "OA".

12_Launceston_1926
Some of the amateurs at an exhibition in Launceston.

13_Hobart_1927
"The Hobart Transmitters, 1927".   At the annual meeting of the Hobart Radio Research Club.
7CW,  7OM, 7HL, 7CH
7LJ, 7DX, 7AH, 7JK 

14_1928_Convention
The delegates at the WIA's Federal Convention in Hobart, 1928.
3SW, 5BY, 7DX, 3KB
 7BQ, stenog, 7CS, 3BM, 3YX, 7AH

15_Toorah
The WIA assisted the ABC on several occasions.
Here are 7DX . . . 7LJ on the Marine Board vessel, Toorah, to broadcast descriptions of the Hobart Regatta in 1929.
7ZL was the ABC station and 7HR the Hobart Radio Research Club.

16_FD1930
Mr Masters, VK7MM and Chas Harrisson, VK7CH, share a pair of headphones at a Field Day in 1930.
The wind up gramophone was used as an automatic Morse sender.

17_7DXlog
Here is a fragment of the log of VK7DX when he was in contact with portable station XVK7WI at the field day.