FreeWave Technologies Inc. 42182112519 Manuale Utente

 

LIG0003AD   Rev A 

Version 6.0 

6 

 

Table 3 below is similar to the Table 2, but shows the information for the 6 dB Yagi antenna. 
 

EIRP for 6dB Yagi Antenna Cable loss vs. RF 

Xmit Power Setting. 

 

  

Cable 

Loss 

 

 

1dB 2dB 3dB 4dB 

RF 

Xmit 10  35.00 34.00 33.00 32.00 

Power  9  33.80 32.80 31.80 30.80 

 

8  32.30 31.30 30.30 29.30 

 

7  30.40 29.40 28.40 27.40 

 

6  28.20 27.20 26.20 25.20 

 
 
Follow the steps below to configure the Power Output Level: 

  Start HyperTerminal or any other terminal emulation program on the computer connected 

to the transceiver’s RS232 port (refer to the User Manual for the HyperTerminal setup 
instructions). 

  Invoke the setup menu on the transceiver. 

  Choose option number “3” from the Main Menu, as shown on the “Hyper Terminal” 

window. 

  Choose option number “5” from the “Radio Modem Parameters” menu followed by the 

settings an appropriate RFXmitPower value, as defined above. The RFXmitPower setting 
may vary from site to site due to differing antennas and/or cable type or length. 

 
 

6. 

Repeat the steps above for each transceiver in the network. 

 
NOTE. 

Please, be advised that antennas other than listed in this section can potentially be used 

with the transceiver provided that: 

• these antennas are of a similar type to the listed above; 
• antenna gain does not exceed 5dB for Omni-directional and 11dBi for directional antenna; 
• overall system EIRP does not exceed 36dBm. 
 

Placement of the FreeWave transceiver is likely to have a significant impact on its performance.  
With regard to FreeWave transceivers generally, the higher the placement of the antenna the 
better the communication link - height is everything! In practice, you should also place the 
transceiver away from computers, telephones, answering machines, and other similar equipment. 
To improve the data link, FreeWave Technologies offers directional and Omni-directional 
antennas with cable lengths ranging from 3 to 200 feet. 
 
When using an external antenna, placement of that antenna is critical to a solid data link. Other 
antennas in close proximity are a potential source of interference; use the Radio Statistics or 
Diagnostics software to help identify potential problems. It is also possible that slight adjustments 
in antenna placement (as little as 2 feet) will solve noise problems. In extreme cases, such as 
when the transceiver is located close to Pager or Cellular Telephone transmission towers, 
FreeWave offers a band pass filter to reduce the out of band noise.