OM-CP-RF Series Operations Manual
Omega Engineering, Inc.
Revised 04/07/05
Page 11 of 18
Prime Number Examples
Two examples are provided in Table 2 below to illustrate the procedure. Notice that
increasing the reading interval by a factor of 6 (1 hour instead of 10 minutes) results in an
increase by a factor of 540 in the time before data is lost (45 days instead of 2 hours)!
Table 2. Prime number examples
Example 1
Example 2
Number of Transmitters
5 5
Reading Interval
10 minutes (600 seconds) 1 hour (3600 seconds)
Max Transmission Interval
300 seconds (= 600/2)
1800 seconds (= 3600/2)
Max Prime Number
30 (= 300/10)
180 (= 1800/10)
Selected Prime Numbers
29, 23, 19, 17, 13
179, 173, 167, 163, 157
Transmission Intervals
* More critical devices
290 seconds
230 seconds
190 seconds*
170 seconds*
130 seconds*
1790 seconds*
1730 seconds*
1670 seconds
1630 seconds
1570 seconds
First Lost Reading After
> 2 hours
> 45 days
INCREASING RANGE WITH THE RFEXTENDER
The RFExtender products can extend the transmission distance of Omega’s OM-CP-RF
series products for up to 1 mile (1.6 km) under ideal conditions. Typical ranges are 1000 to
2000 feet (300 to 600 m) outdoors, and up to 300 feet (100 m) indoors. An RFExtender
system requires a minimum of two RFExtender transceivers, one at each node of the
wireless link. The RFExtender transceivers require AC power.
Simple RFExtender System
A basic set-up might be one of the two configurations below:
Figure 4. RFExtender as a wireless repeater
Summary of Contents for OM-CP-RF Series
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