The Hindu : Opinion / News Analysis : Corrections and Clarifications

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Friday, Apr 27, 2007
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Opinion

Opinion - News Analysis

Corrections and Clarifications

In "Question Corner" ("Science & Technology/Agriculture" page, April 19, 2007) and with reference to a question "Why are all radio receptions except FM band affected when cable TV us switched on?", a sentence in the answer was: "The detection and amplification process in an AM band is done using a `mixer' circuit, which mixes the received signal with a sinusoidal signal generated by a local oscillator operating at 470 kHz." A reader said it was an error as both AM and FM receivers use a mixer circuit and that the local oscillator signal frequency is not 470 KHz, as was published. Dr. H.K. Sahu, Senior Scientific Officer, Indira Gandhi Centre for Atomic Research, Kalpakkam, clarifies: "It is true that the local oscillator in an AM receiver of the receiver is ganged to the RF tuner so that the difference in the frequency is the Intermediate Frequency of about 455kHz as is used as the standard. In fact, historically the IF has been as low as 20kHz, (around the 1920s), which led to image interference and was revised; also for some time it was 470kHz which has now been again changed to 455kHz. However, it is true that IF amplifier is tuned to 455kHz in AM nowadays, and not 470kHz. Similarly, the IF of a FM receiver is 10.7MHz. However, it may be noted that the answer to the question does not really depend on the local oscillator frequency, but the main idea is to explain why the FM reception is less effected by the EM interference. And I have attempted to do that by bringing in the difference between the reception of amplitude modulated and frequency modulated signals."

A sentence in an AP report "South Africa skittled out cheaply" ("Sport", April 26, 2007), on a World Cup semi-final, was: "Glenn McGrath captured three for 18 and Shaun Tait four for 29 to do most of the damage as South Africa's attempt to match Australia's power-hitting game ended in dismal failure." The Sports Bureau clarifies that it should have been 4/39, as given in the scoreboard compiled by the desk.

It is the policy of The Hindu to correct significant errors as soon as possible. Please specify the edition (place of publication), date and page.

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