Motorola Bravo classic Service Manual download pdf (Page 53)

APPENDIX 4

SENSITIVITY TABLE

A 512 baud POCSAG pager is often specified to have a sensitivity of about 4 microvolts per meter (uV/m);

that is, it should receive a page correctly if the RF signal received at its small loop antenna exceeds 4uV/m.

That sensitivity will be somewhat less than the sensitivity for an average FM receiver, specified as 0.5 uV for

+12 dB SINAD. When testing pagers, using a radiation test fixture, you'll be measuring sensitivity in uV or

dBm as shown in Table A4-1. Expect a good pager to have a sensitivity, taking into account the dB loss of

the test fixture, of about 1 to 2 uV, equivalent to -131 to 137 dBm.

Table A4-1: Microvolt/Power Dial Equivalents (50 ohm load)

uVolts - rms power in dB power in dBm sensitivity

50 -103.0 -73.0

40 -104.9 -74.9

30 -107.4 -77.4

20 -111.0 -81.0

10 -117.0 -87.0

9 -117.9 -87.9

8 -118.9 -88.9

7 -120.1 -90.1

6 -121.4 -91.4

5 -123.0 -93.0

4 -124.9 -94.9

3 -127.4 -97.4

2 -131.0 -101.0 pager @ 512

1 -137.0 -107.0

0.5 -143.0 -113.0 FM receiver

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Motorola Bravo classic Service Manual Page 53