Trade Developments

Radio Record, Volume II, Issue 39, 12 April 1929, Page 9

Trade Developments

Airzone "Three" on Distance

(By

Observer

qt has already been remarked that the Airzone "Three" is capable of handling very great volume without distortion; in fact, it was found on test that it could operate a power valve of the 171 type. It would be possible to operate a very large speaker on the local station and so supply all the volume that could be desired with perfect quality. It remains to add a few comments on the distance-getting achievements. The main New Zealand and Australian stations on the speaker have been ‘claimed, and it was found by the writer to. fulfil this claim. The set was tested at a point too close to 2YA to allow of that station being eliminated and _ others brought in, though a wavetrap was incorporated. It was found that this latter was an excellent volume control, for there is no better place to reduce the strength of the signals than before thev enter the set. After the local station had closed down the following stations were brought in on the speaker at comfortable strength, that is, they could be enjoyed without straining: 1YA, 3YA, 2BL, 2FC, 8LO, 8AR. 4QG, 4YA could be heard, but the attention had to be fixed on the signals in order to follow them. A special feature of. the set is its yery smoothly operating controls.