Radio Manila

Radio Record, Volume III, Issue 20, 29 November 1929, Page 32

Radio Manila

Description of Trans‘mitters STATED in last week’s issue of the "Radio Record" that station RA97 was operating on 37 metres, but the station I heard was RA19, Tomsk, Siberia. The following is a letter received from the Radio Corporation of the Philippines, giving details of station KZRM, A. D. Rogers (Wellington) :- "We are in receipt of your letter reporting reception from KZRM, Radio, Manila, and desire to thank you very much indeed for your comments. Examination of the official log of this station confirms your report, and we wish to take this opportunity of congratulating you. Enclosed herewith please find a schedule of our weekly

broadeast, and a short. deseription the transmitters--Marguerite Cro’ well (broadcasting manager)." The KZRM Transmitters. HE transmitters are located at Manila Heights, approximately seven. miles from the studio. The latter is on the top floor of the Manila Hotel, Manila, Philippine Islands. The long-wave transmitter is of one k.w. power. The antenna used with this transmitter is approximately 300ft. high, and_is supported by two steel towers. This transmitter is not crystal controlled, but the frequency (618.5 ke.) is maintained accurately, and

there is little swinging or variation of frequency. The high frequency transmitter puts one k.w. of energy into a special tuned antenna of the doublet type. The set is erystal controlled, with the crystal controlling the frequency of a 50 watt tube. The output of this stage then passes through the°*following stages, either doubling or amplifying: One 75-watt tube, two 75-watt tubes, and finally two 750-watt tubes, working through’ inductive coupling into the antenna circuit. This set is at present operating on a frequency of 6130 k.c. Weekly schedule of KZRM, 488 metres :-Daily (except Monday night), 4 to 5 p.m., recorded music; and 6 te 10 p.m., varied programme.