FreeWave Technologies Inc. AMI0032AT Manuale Utente

 Spread Spectrum Wireless Data Transceiver User Manual 

Preliminary GXM Manual 

Version 0.2 

26 

The Edit Radio Transmission Characteristics option allows the user to modify several different parameters 
in the transceiver. Many of these parameters must be maintained throughout the network for proper 
functionality.  

   This menu is only for the sophisticated user who has a good understanding of the principles of 

radio data transmission.  

The settings for the Slave(s) and Repeater(s) not determined by the Master are RF Xmit Power, Slave 
Security, Retry Time Out and Hop Table Size, Hop Table Version, and Hop Table Offset. 

Selecting 3 Edit Radio Transmission Characteristics from the Main Menu displays the following window: 

 

 

Selection 0 in the Radio Parameters menu allows the user to modify the hopping patterns of the 
transceiver. Fifteen choices are available for the FreqKey (0-9 and A-E) setting, representing 15 different 
pseudo-random hop patterns.  This is to minimize the interference with other FreeWave transceivers 
operating in the area. For instance, if 10 pairs of FreeWave transceivers are operating on different 
networks in close proximity, setting a different FreqKey value reduces the chance that transceivers will 
hop to the same frequency at the same time. If two networks were to hop to the same frequency, the next 
hop would be to a different frequency for both networks.  

Additional network separation can be gained by adjusting the Max and Min packet sizes, options 1 and 2. 

After selecting 0 FreqKey, select F for additional options. The Hop Table Parameters will appear in the 
window.  From this menu, more network differentiation can be defined by way of limiting the number and 
location of frequencies the transceivers may hop on in the 2.4 – 2.483 GHz band.   

   ALL transceivers in a network must have identical Hop Table settings to function properly.