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To: wonk who wrote (6440)2/17/2000 5:38:00 PM
From: semi_infinite   Respond to of 12823
 
Thanks professor ww

Do you have a recommended reference for further reading? I am interested in how the equations are derived and the things, environmental conditions etc..., that affect the coefficients. Thanks.



To: wonk who wrote (6440)2/18/2000 7:57:00 PM
From: Scott C. Lemon  Read Replies (1) | Respond to of 12823
 
Hello wireless_wonk,

You are awesome! I hadn't expected to see this type of analysis and calculations on here ... and it's much appreciated!

I wanted to ask you a couple of questions on your formula (as I'm typing it into my spreadsheet ... ;-)

In your line items 2 and 3 you have 0db gain on the antennas. If the antennas that I'm looking at are a 5db Omni at my office, and then carrying a 10db gain yagi with me, do I really just add these numbers in and get the new results?

Also, with 25' of coax on the omni, and let's say a 10' coax on the yagi do you think I need to account for loss?

I want to plug these in and see what happens to the numbers ...

Also, in choosing between 900Mhz and 2.4Ghz which would you expect to suffer from other device interference? Would there be other radio equipment that would commonly be used that might cause more problems?

Thanks again for the great info!

Scott C. Lemon



To: wonk who wrote (6440)2/18/2000 8:04:00 PM
From: Scott C. Lemon  Respond to of 12823
 
Hello wireless_wonk,

One more question ... where did you get the "36.6" when calculating the FSL?

Thanks again!

Scott C. Lemon



To: wonk who wrote (6440)2/18/2000 8:12:00 PM
From: Scott C. Lemon  Respond to of 12823
 
Hello wireless_wonk,

<OT> Sorry ... last question ...

I got the spread sheet together and working, looks cool ... but I noticed another "constant" in there ... the "20*log" ... what's the 20 represent?

I promise that I will give everyone here some feed back on my success (or lack of) in getting this going ... and I'll try to post to SI from the top! ;-)

Scott C. Lemon