oldest transmitter still in use has been located. WNAH in Nashville
began using its Gates BC-1T transmitter in 1960. It is currently used
as the station's main transmitter.
This 1,000W AM transmitter was manufactured and sold between
1957-1962. It features an in-built dummy antenna for off-air testing
and its RF output impedance matched loads from 50Ω to 70Ω.
The transmitter weighs 800 lbs. and has provision for two vacuum-type
crystals and holders. The transmitter is encased in a steel cabinet
with a meter panel that slopes forward for easy observation.
A selling point of this transmitter was the combination of a cathode
follower, a modulation system that modulates the Class C and RF driver
amplifiers and overall feedback, which resulted in a new distortion
low. The prototype of this transmitter actually produced 50-cycle
distortion as low as ½ of 1 percent.
The transmitter's frequency response is 50Hz to 10kHz to balance
response losses often found in other parts of the overall broadcasting
system. All BC-1Ts shipped with an internal dummy load. It was the
first Gates model to include one as standard equipment.
That was then
ad graced the back cover of the September 1952 issue of Complete
Baseball, a “big league baseball magazine.” The ad is
trying to sell booklets that will teach people how to be radio and TV
engineers. At the bottom of the ad is a coupon to send in to get both
booklets for free.
“Many students make $5, $10 a week extra fixing neighbors'
radios in spare time while learning. The day you enroll, I start
sending you special booklets to show you how to do this,” the ad
reads. “Tester you build with parts I send helps you service
sets. All equipment is yours to keep.”
“Your next step is a good job installing and servicing
radio-television sets, or becoming the boss of your own
radio-television sales and service shop or getting a good job in a
“And think of the opportunities in television!” the ad
reads. “In 1950 over 5,000,000 television sets were sold. By 1954
authorities estimate 25,000,000 television sets will be in use. Over
100 television stations are now operating, with experts predicting
The prediction fell short. Today, there are nearly 4,500 TV
stations, including all low-power stations.
Sample and hold
If you were considering purchasing a satellite radio for yourself or
someone else, what would be a reasonable price to pay?
Source: eBrain Market Research -
Digital and Satellite Radio Mini Study - March 2003