Shaping radio today and tomorrow
|Do you remember?
In 1972, American Electronics Laboratories, based in Lansdale, PA, advertised the new FM-12KD and FM-25KD (12kW and 25kW) FM transmitters. These transmitters boasted a two-tube design with a grounded grid final amplifier (3CX15000) and tetrode driver stage (4CX1000K), automatic filament voltage control, automatic power control, solid-state control circuitry, a solid-state exciter and power supplies, and VSWR protection.
The transmitter was unveiled at the 1972 NAB convention.
That was then
WHAS-AM, Louisville, KY, signed on July 18, 1922. Like most early stations, it changed frequency assignments several times, finally staying on 840. By 1932, the station was licensed for 25kW operation. In 1933, the power was increased to 50kW. In 1938, the station owners built a new transmitter site in Eastwood, KY.
The photo shows the transmitter room as it looked about the time when it was built. On the left is the Western Electric WHAS transmitter. On the right is the FM transmitter for what would become WHAS-FM. This transmitter was likely the experimental station for W9XEK at 45.5MHz. In the middle is the console for the Western Electric transmitter. WHAS, which was co-owned with Courier-Journal newspaper, experimented with transmitting an early facsimile system that would transmit the data to receiver-printers in people's homes. This transmitter, licensed as W9XWT, was behind the FM transmitter.
Hanging above the WHAS transmitter are the licenses of all the engineers of the station.
WHAS photos and information provided by Scott Cason. See moreat
Do you have information and pictures of a station from radio's
Tell us about it for an upcoming installment.
Sample and Hold
A look at the technology shaping radio
Internet radio listening continued to rise in 2001.
* the 10-week base period is an average of the weekly total time
spent listening from October 30, 2000 through January 7, 2001.
** Index values are for an entire week ending on the date listed above.
Source: MeasureCast Internet Radio Listening Index 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.
This high-visibility and high-traffic area got the full acoustic treatment.
Browse Back Issues[an error occurred while processing this directive]
Also in the May Issue
- Remote Access and Site Connectivity: Wireless
- Standards of FM Allocation and Interference
- Side by Side: Mic Processors
- Field Report: Deva Broadcast DB4004
- Field Report: APT WorldCast Systems Horizon NextGen
- New Products
- 20 Years of Radio magazine: May 1994