Campbell RF400 Manual descargar pdf (Pagina 108)

Appendix K. RF401/RF411 Pass/Fail Tests

FIGURE K-3. 3 dBd 900 MHz Collinear Omni Antenna

(d) Set up remote RF401/RF411 with NO antenna and with antenna

connector 20 inches above floor.

(e) Arrange antenna distance apart according to following table.

TAB H a eLE K-1. 900 M z Gain Antenn T st Distances

Power Ratio

vs. ve

Distance Apart*

ntenna Gain

er ¼ Wave ¼ Wa

(

RatioPower ft. 5 ×

)

9 dBd 11.2 dB 13.18 18 ft.

6 dBd 8 . .2 dB 6.61 13 ft

3 dBd 5.2 dB 3.31 9 ft.

-2.2 dBd 0 dB 1.0 5 ft.

* This assumes a signal strength vs. distance relationship of 1/d

(f) Type 8 groups of 5 characters on the terminal (aaaaabbbbbccc

(g) 100% of characters should appear on screen with good yagi/c

antenna.

cc etc.)

ollinear

(h) Removing yagi/collinear antenna, you should get no echoed

characters.

K-6

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Campbell RF400 Manual Pagina 108