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Old December 6th 08, 07:16 PM posted to rec.radio.amateur.antenna
Ginu Ginu is offline
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First recorded activity by RadioBanter: Sep 2006
Posts: 14
Default confusion about path loss calculation for zigbee

On Dec 5, 2:10 am, Richard Clark wrote:
On Thu, 4 Dec 2008 21:59:34 -0800 (PST), Ginu
wrote:

anyone?


You appear to be contradicting yourself:P_required... translates to a transmit power of 1 mW.
...
However, 1mW happens to be the maximum transmit power


However?

As for: I hope my math is clear.

If your conclusions for these case tests depart from rational
expectations; then you have one of two possibilites:

1. Your math may be clear, but wholly invalid (transcription error of
complex formulas into ascii text is a bummer);

b. Your math may be clear or murky, and otherwise entirely correct,
but you did it wrong.

iii. You suffer from transcription AND "plug-n-chug" errors;

four. Zigbee technology doesn't work.

If this is a classroom problem, you need to resolve it yourself. If
this is an engineering problem, what did the Zigbee help-line offer?
There's probably a simple nomograph posted at their website or in
their application notes.

73's
Richard Clark, KB7QHC


This isn't a classroom problem. It is a research study that I am
conducting.

For the first case, I used a distance of 500 metres, which
corresponded to what happens to be the maximum allowed power of 1 mW.
Hence, I stated that I may be having a range issue because I was
testing the maximum distance case. That is why I provided a case for
300 metres as well.

If I'm doing something incorrectly, this is why I posted this question
to the board. Stating that my math may just be wrong, doesn't really
help the situation.

I will check into the Zigbee forums thank you.