ResMed III ST-A user manual Separation distance according to frequency of transmitter

Recommended separation distances between portable and mobile RF communications equipment and the VPAP III ST-A

The VPAP III ST-A is intended for use in an environment in which radiated RF disturbances are controlled. The customer or the user of the VPAP III ST-A can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the VPAP III ST-A as recommended below, according to the maximum output power of the communications equipment.

	Separation distance according to frequency of transmitter
	m
Rated maximum output	150 kHz to 80 MHz	80 MHz to 800 MHz	800 MHz to 2.5 GHz
power of transmitter	d = 1.17 √P	d = 0.35 √P	d = 0.7 √P
W
0.01	0.17	0.04	0.07
0.1	0.37	0.11	0.22
1	1.17	0.35	0.7
10	3.69	1.11	2.21
100	11.70	3.50	7.0

For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (m) can be determined using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer.

NOTE 1: At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.

NOTE 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects and people.

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