A RADIO VISIT TO TROPICAL AMERICA

Radio Record, Volume XII, Issue 25, 2 December 1938, Page 39

A RADIO VISIT

TO TROPICAL AMERICA

Estacion COGF"Voice of the Yumuri Valley"

By

ALEX

SIMPSON

THIS, the first of « series of artictes te be published in the "Record" en the radio stetions of Central A shortwave station owned end operated by Senor Bernchbe de la Torre, a young man who is renidiy mechine a mame for himself ia Cuban radio circles. The auther, a prominent N.Z. DA Club official. owes much of his infermeation to the fact that he reads, writes and speaks Sacnish fluently and has many correspendents in Latin America.

ENOR BERNABE DE LA TORRE, who constructed and owns COGF, with its longwave station CMGF, has recently constructed the new longwave station CMBQ in Habana, He is now the Technical Director of CMBQ, and his two transmitters in Matanzas are now relaying the programmes of this station. PA The special programme which was dedicated over COGF 4 the N.Z. DX Club on May 29 resulted in a good response in the way of reception reports from club members, although the reception happened to be exceptionally poor. The home of the de la Torre family faces the beach in Matanzas, from which is derived the address, "Playa (beach), 51," and the name "Matanzas" has its origin in the early struagles which took place at this soot, between the original inhabitants, the ‘"Siboneys," and the Conquistadores. All correct reports are acknowledged with an attractive verification card, and any used stamps which members may care to enclose will be appreciated. Transmitter Details AS can be seen from the composite photograph, which shows the transmitter, studio and control room, the transmitter has three main section panels.

The first one contains the exciter unit of radio Trequency with its power supply, over-maintaining an adequate temperature in the crystal. This exciter unit is made up of a 59 tube as oscillator (master oscillator) controlled by crystal; a 59 tube as frequency doubler; a H.F. 100 buffer amplifier, and a H.F. 200 as driver to final stage of class C. The second panel section contains the final pass or radio frequency class C, which is made up of four T 200 tubes, working in push-pull parallel, with some 2000 watts input. his panel also contains the modulator with its driver, the modulator consisting of four 822 tubes, and the driver of two 45's. © The third panel contains the rectifier and filter for the class C amplifier, modulator, bias rectifiers, overload relays, etc. The power transformers and modulation troensformer are of the oil-submeraer type, and are mounted about two feet behind the pane! chassis. The antenna is-of the half-wave type, fed by centre line tuned at one-quarter wavelength, and is approximately 60 feet above sea-level. ---