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PCGG
Videos
PCGG was a radio station located at The Hague in the Netherlands, which began broadcasting a regular schedule of entertainment programmes on 6 November 1919. The station was established by engineer Ha
Advertisement placed in the 5 November 1919 Nieuwe Rotterdamsche Courant announcing PCGG's debut broadcast scheduled for the next evening.
Advertisement placed in the 5 November 1919 Nieuwe Rotterdamsche Courant announcing PCGG's debut broadcast scheduled for the next evening.
PCGG was located at the Nederlandsche Radio-Industrie building at Beukstraat 8-10 in the Hague, Netherlands (April 1921)
PCGG was located at the Nederlandsche Radio-Industrie building at Beukstraat 8-10 in the Hague, Netherlands (April 1921)
Hans Idzerda, founder of the Nederlandsche Radio-Industrie and PCGG (April 1922)
Hans Idzerda, founder of the Nederlandsche Radio-Industrie and PCGG (April 1922)
Musicians in the PCGG studio. The over-sized horn in the background was connected to the transmitter's pickup microphone (April 1922)
Musicians in the PCGG studio. The over-sized horn in the background was connected to the transmitter's pickup microphone (April 1922)
Frequency modulation
Videos
Frequency modulation is a signal modulation technique used in electronic communication, originally for transmitting messages with a radio wave. In frequency modulation a carrier wave is varied in its
PCGG
…8, 1919. While most audio radio transmissions at this time employed AM (amplitude modulation) signals, Idzerda patented a method for "narrow-band" FM (frequency modulation) transmissions. (This is in contrast to the modern day "wide band" FM, originally developed in the 1930s by Edwin Howard Armstrong.) This could be…
FM has better noise (RFI) rejection than AM, as shown in this dramatic New York publicity demonstration by General Electric in 1940. The radio has bot
FM has better noise (RFI) rejection than AM, as shown in this dramatic New York publicity demonstration by General Electric in 1940. The radio has both AM and FM receivers. With a million-volt electric arc as a source of interference behind it, the AM receiver produced only a roar of static, while the FM receiver clearly reproduced a music program from Armstrong's experimental FM transmitter W2XMN in New Jersey.
Frequency spectrum and waterfall plot of a 146.52 MHz carrier, frequency modulated by a 1,000 Hz sinusoid. The modulation index has been adjusted to a
Frequency spectrum and waterfall plot of a 146.52 MHz carrier, frequency modulated by a 1,000 Hz sinusoid. The modulation index has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle an infinite number are produced in FM but the higher-order sidebands are of negligible magnitude.
An American FM radio transmitter at WEDG in Buffalo, New York
An American FM radio transmitter at WEDG in Buffalo, New York