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FCC WIDENS REMOTE CONTROL RULES
G.E. designs new 50 kw AM transmitter to let you make the most of the new FCC ruling
"Should I rework my present transmitter or replace it when I go to remote controlled operation?"
Consider this fact: No modernization program can be expected to give you performance equal to that of General Electric's new 50 kw am transmitter, Type BT50-A. It incorporates new components and new concepts that anticipated broadcasters' needs.
Remote control is an example. This transmitter includes remote control metering resistors in all important circuits; it provides for remote control of start-up, monitoring, shut-down, crystal-switching and power output control. The plate modulated Class C amplifier stage operates into directional antennas without strain. It was designed for reliability — to require a minimum of maintenance. With remote control, this factor is more important than ever.
Germanium rectifiers (replacing mercury vapor tubes) and other modern components give high reliability.
Advantages over rewired rigs
The design of the new Type BT-50-A has several major advantages over any previously available transmitters:
1. Uses germanium rectifiers for DC power supply to give you — longer life — no voltage surges caused by arc starvation — no warmup — no filament failure.
2. Uses conventional KF circuits that are familiar, simple and proved in performance.
3. Uses new, modern components chosen for reliability.
4. Provides automatic surge protection and provision for power reapplication.
5. Roomy, uncluttered cubicles, with all components accessible.
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XEAC, Tiajuana, Baja California went on air with BT-50-A September 23. 1957.
6. Uses only three Class C amplifier stages that produce 53 kw output at the terminals.
7. Gives you year-round operating economy because: small tube list — only six types totaling 16 tubes. — holds down tube inventories. Low power consumption — 108 kw at 0.91 power factor for average (30%) modulation.
8. Uses final amplifier tubes that weigh only 20 pounds, need no dollies or hoists to change.
Complete information available
Before you make your decision to rework or replace, contact your nearest General Electric Broadcast Equipment District Manager. He can give you full information on General Electric's complete remote control package for 50 kw AM stations.
If you want written technical information on this revolutionary new transmitter, write Broadcast Equipment, Section 1-N47, General Electric Company, Electronics Park, Syracuse, New York. In Canada, write General Electric Company, Ltd., Toronto. Outside USA and Canada, write International General Electric Company, Inc. Electronics Division, 150 East 42nd Street, New York, New York, USA.
Progress Is Our Most Important Product
GENERAL® ELECTRIC
Broadcasting
November 4, 1957 • Page 75