Duty Cycle

FCC ID: IPGWWS1

Test Report

Download: PDF

FCCID_110659

Point Six , Inc.
383 Codell Drive
Lexington, Ky. 40509
606-266-3606 Fax 271-0702

Dear Mr. Curtis:

The Texas Weather Instruments wireless weather station transmits a 45-50
millisecond packet once each 15-16 seconds. The packet consists of
transmitter-on/transmitter-off timing that represents the weather data.
The duty cycle is approximately 50%. The packet time can vary with data
content between 45-50 milliseconds. The packet data is controlled by a
microprocessor whose timing is based on a ceramic resonator that is very
stable. The packet below (figure #2) illustrates a typical data packet,
the worst case, 50 milliseconds, cannot be shown because a great many
real weather variables would need to be forced to make this so. Figure
#1 illustrates the overall timing; a packet is sent each 15-16 seconds.

The battery used during the tests was new and custom packaged by CarGo
Battery Co. The battery is a 6 Volt BR Lithium chemistry, which has a
flat discharge curve from new to about 90% used. In this application
the battery requires about 7 years to discharge to the point that it
cannot be used. The battery was used for no other purpose and had
operated in the test unit for only a few days when the test was
performed.

Figures #3 and 4 below illustrate the antenna coaxial cable and the
soldered direct connection (no connector) to the PC board of the TWI
wireless weather transmitter. The antenna is a Linx Technologies model
ANT-418-PW-QW.

John I. Compton
President, Point Six, inc.

Document Created: 2000-07-27 14:34:41
Document Modified: 2000-07-27 14:34:41

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