transmitter used for signaling for
the door to open, (see photo 13).
The range for the transmitter is
approximately 100 yards in ideal
conditions. The reason they have
such a great range is their 915
Mhz frequency and the spread
spectrum transmission. Spread
spectrum means that the system
is transmitting on three frequen-
cies at the same time. Whichever
is the best, the system will use. I
bet you would never guess that
the batteries will last for two
years at 100 openings per day!
The third hands free switch is
the CM-333. It is very similar to
the 330 with a couple of exceptions. On the front there is a
10. CM-330 hands free door
11. Dip switch locations. 12. Adjustable pot location.