Most Popular Articles
Shaping radio today and tomorrow
Do You Remember?
The Time Tunnel digital audio delay system offered a broadcast-quality, six-second audio delay that used a digital memory system to provide consistent audio reproduction. Unlike tape delay systems, it had no moving parts to wear, no preventative maintenance was necessary and the performance did not degrade with time.
The Time Tunnel was offered in two models: the TDG-1 with a 15kHz bandwidth and the TDG-2 with a 7.5kHz bandwidth. Both models created a frequency response flat within 0.25dB and a total harmonic distortion of less than 0.5 percent. They offered an operating range of greater than 66dB with a clipping level of 12dB and a system signal-to-noise ratio of greater than 80dB.
That was then
This is the radio transmitter room of KPO in Hale's Department Store, San Francisco, in 1925. Shown in the foreground is the Western Electric 1kW model 6A transmitter. In the background are marble-faced electrical control panels, which at the time were the only ones of their kind in the country.
The KPO employee inspecting the transmitter is probably Claire Morrison, KPO's first full-time announcer. The transmitter was a newer design and unlike earlier transmitters, it was capable of 100 percent modulation. By this time, most stations were assigned to their own frequencies and transmitted for significant portions of the day. KPO is now KNBR, San Francisco. Photo courtesy of Bill Ruck, KNBR.
Sample and Hold
A look at the technology shaping radio
What do talk-radio listeners do while listening to the radio?
Source: Scarborough Research, Release 2 2001
Acceptable Use Policy blog comments powered by Disqus
[an error occurred while processing this directive]
Today in Radio History
The history of radio broadcasting extends beyond the work of a few famous inventors.
EAS Information More on EAS
The feed provides feeds for all US states and territories.
Need a calendar for your computer desktop? Use one of ours.
Information from manufacturers and associations about industry news, products, technology and business announcements.
Browse Back Issues[an error occurred while processing this directive]
Also in the January Issue
- Trends in Technology: AES-X210, The "Missing Piece" of AES67?
- FCC Proposes Online Publc File Rules for Radio
- RF Engineering: Licensing AM Stations Using Method of Moments
- Field Report: Zoom H6