A Short-Wave Schedule.

Radio Record, Volume I, Issue 49, 29 June 1928, Page 16

A Short-Wave Schedule.

SHORT-WAVE station KDA, of Pennsylvania, U.S.A., made an announeement for overseas listeners whieh may be of interest to some of your readers. They announced that in future they would broadcast every Mouday and Thursday afternoon between 2 pm. and 4 pan. ‘These times are Pennsylvaninn. I have not attempted to give the eorresponding New Zealand time, as I do not know whether daylight saving is in operation in that State. [Yes-throughout the States -Hd.] I tuned them in on the speaker at 3 p.m. yesterd*y afternoon, Thursday, June 14, and as they closed down at 34 p.m. there was little time. They came in at very, fair speaker strength with one stage of radio detector and two of audio. The wave-length is, as near as I can judge, about 264 metres, While on the subject it may be of interest to some to know that a stage of radio frequency before an ordinary adaptor or shortwave set makes short-wave reception a pleasure indeed. The shield grid tube has certainly given us a simple means of efficient amplilication in the short-wave band. The radio frequency amplifier used by the writer is practically the same circuit as that deseribed in a recent issue of the "Radio Record." The only difference is that I use magnetic instead of electro-static ccupling between the aerial and the set and also a slightly different arrangement for obtaining grid bias. These are yery minor points, and the | circuit as described in "Radio Record" should not give the least trouble. There are two very marked advantages apart from the added amplification, and these are quietness of reception and a very noticeable absence of body capacity. Tuning is very much easier despite the one extra, control.-J. i Howard (Marton). | ee on -¢