0S0SOSOS0COCOGOCOGOSSOSOSOSOSOCOCOCOCOC( C 0L U MB U S Intern ationa l M 0 DE L 9 0 OS0S30S0S0S0S30SOSOSOSS0S SOS0S0S0S080=0800 Calibrated Spreading of Shortwave Bands a simple method of shortwave tuning N its broadest sense, calibrated bandspreading oRIHO dox PLAL I denotes a technique of radio design whereby a shortwave reception band is greatly expanded and the dial of the radio is precisely graduated into C 0 L u M B U $ 0 ! A L divisions corresponding to transmitter frequencies. IB100 15109 6400 (5560 6s 600 As a result of this technique of design, two very sub- stantial improvements are effected in the shortwave operation of Columbus Model 90_ Nation wide Sereice 1. Since the shortwave bands on the dial of Model 90 Whangarei, Auckland, Hamilton, Rotorua, are expanded to close on 6 inches (on the orthodox Gisborne, Napier, Hastings, Dannevirke, radio the same bands average about 1 inch) it has Taihape, New Plymouth, Wanganui; Palm- been possible to print on the shortwave dial the erston North; Masterton, Wellington, exact position of transmitter frequencies. Thus, if Nelson; Greymouth; Christchurch; Timaru; a station is heard at 9500 on the Columbus calibrated dial, that station must be XEWW Mexico City, Oamaru, Dunedin, Gore, Invercargill: because there is no other station transmitting on 9500 kilocycles. Consequently the Model 90 makes it possible for anyone to select or identify shortwave stations by direct dial reading and checking against a station list. Everyone has long been accustomed to doing that with broadcast stations, but this is the first time that the same procedure has been possible with shortwave listening: 2. The band expansion has the effect of eliminating "hair-breadth" tuning of shortwave stations 3 the deficiency which is So vexatious in orthodox radios. It stands to reason that if a shortwave band is ex- panded to over 20 times its conventional length, the tuning of any station on that band will be just 20 International COLUMBUS Model 90 the times easier. And So it is with Model 90. The ex- most modern radio receiver in the world: asperating fiddling that is necessary with orthodox radio tuning of shortwave is transformed with Model 90 to easy, full-handed tuning that brings in short- wave programmes just as simply as 1YA, 2YA or CQLUMBUS any other local New Zealand station. Next Week: DISCRIMINATORY TONE CONTROL _ RAD/ 0 a statement of new Columbus development.
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New Zealand Listener, Volume 14, Issue 351, 15 March 1946, Page 15
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393Page 15 Advertisement 1 New Zealand Listener, Volume 14, Issue 351, 15 March 1946, Page 15
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