Most Popular Articles
Do you remember?
The Tektronix Type 561A oscilloscope was used to check performance characteristics of FM stereo generators and 10W FM transmitters. Seventeen amplifier and time-based plug-in units could be used for different types of applications. The unit displayed single or multi-trace presentations. The upper trace displayed a composite left only signal, including the 19kHz pilot carrier. The lower trace presented the 38kHz L-R subcarrier. The oscilloscope provided an 8cm × 10cm viewing area. In 1964, this piece of equipment's retail price was $500, not including plug-in units.
That was then
The motor generator room of the General Electric station KGO in Oakland, CA, contained nine motor-generator sets. In 1924, these supplied current for heating the filaments of the tubes, plate potential for the power amplifiers, bias potential for the amplifier and modulator tubes, and excitation for the various generators. These machines were all in duplicate, thus ensuring a continuous program in the event of failure. Motor generators were required to create the dc power because high-voltage rectifiers were not yet available.
Source: John Schneider's Broadcast History at users.adams.net/~jfs.
Sample and Hold
Radio by the numbers
Source: 2004 Radio magazine Salary Survey.
Question of the Month
The digital transition
Please take a moment to complete our survey. The results will be published in the March 2005 issue.
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