_The Evening Post_, 11 April 1925:
IMPROVEMENTS AT 1YA
According to the “New Zealand Herald,” #1YA has greatly moderated its broadcast service.
Afternoon broadcasts from 2.30 to 4.30 have commenced, and will be given on four afternoons a week. While mechanical music will be given at first, it is understood that other arrangements are being made for the immediate future. Permission has been obtained to install a microphone in “Dixieland,” and the work is to be proceeded with at once. The long-waited microphones for 1YA have been dispatched from Australia, and upon their arrival it is proposed to immediately broadcast the Lyric Theatre Orchestra and the Dixieland dance music. It is hoped to obtain a room below the studio to receive the artists and to serve as a waiting-room, so that no other than the person being broadcasted will be allowed in the studio.…
The writer of the foregoing (“Thermion”) states that with the increase of 1YA's wavelength to 420 metres, a good deal of interference by ship’s morse on 450 metres has been experienced. The station has reverted to 330 metres, and, although the input power has been raised to 200 watts, … there is no apparent increase in the volume locally.
https://paperspast.natlib.govt.nz/newspapers/EP19250411.2.192.3