Article image
Article image

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.

This article text was automatically generated and may include errors. View the full page to see article in its original form.I whakaputaina aunoatia ēnei kuputuhi tuhinga, e kitea ai pea ētahi hapa i roto. Tirohia te whārangi katoa kia kitea te āhuatanga taketake o te tuhinga.
Permanent link to this item
Hononga pūmau ki tēnei tūemi

https://paperspast.natlib.govt.nz/periodicals/NZLIST19460315.2.29.1

Bibliographic details
Ngā taipitopito pukapuka

New Zealand Listener, Volume 14, Issue 351, 15 March 1946, Page 15

Word count
Tapeke kupu
393

Page 15 Advertisement 1 New Zealand Listener, Volume 14, Issue 351, 15 March 1946, Page 15

Page 15 Advertisement 1 New Zealand Listener, Volume 14, Issue 351, 15 March 1946, Page 15

Log in or create a Papers Past website account

Use your Papers Past website account to correct newspaper text.

By creating and using this account you agree to our terms of use.

Log in with RealMe®

If you’ve used a RealMe login somewhere else, you can use it here too. If you don’t already have a username and password, just click Log in and you can choose to create one.


Log in again to continue your work

Your session has expired.

Log in again with RealMe®


Alert