reply to request re modulation

0029-EX-ML-2006 Text Documents

LBA Technology, Inc.

2006-08-03ELS_77307

The antenna systems being tested are short, rapidly deployable systems
for AM broadcasting under military and emergency conditions. It is
characteristic of these systems that they develop quite high peak
voltages compared to conventional AM antennas. During a portion of the
test procedure, the robustness of the antenna systems under this power
stress is observed. In order to ensure that the antennas are capable of
handling peak voltages typical of a 125 - 140% modulated carrier
(typical of modern AM broadcast transmitters), it is necessary to test
the antennas using modulation similar to typical program modulation.
Carrier only transmissions, or sine wave modulated transmissions can
not duplicate the peak/average voltage and power ratios encountered in
complex program modulation. There will be no "program" transmission in
the sense of the broadcast of voice or musical entertainment
performances. We would only use a technical transmission in the nature
of a repeating voice test identification containing a brief musical
passage typical of the client's content requirements, sufficient to
reasonably impose the requisite high peak voltages on the system.
During other periods, such as when only field intensity was being
measured, an unmodulated carrier would be used.

Document Created: 2006-08-03 10:19:39
Document Modified: 2006-08-03 10:19:39

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