[Tinyos-help] [Q] TX failure of first packet over radio link

[Chong Hui Kim]

Dear all,

I found that first packet was very often failed over radio link (CC2420).
I transmitted periodically with some periods: 30ms, 50ms, ans 100ms.
Commonly, first packet was failed to transmit using SendMsg.send() command.
In my test, I knew that SendMsg.send() returned FAIL so that physical transmission did not occured.

Why does this?
Does CC2420 chip require start-up time to be ready to transmit packets?

When I set the period as 1sec, first packet transmitted successfully.
When I set the period as 100ms, first one packets failed to transmit.
When I set the period as 30ms or 50ms, first two packets failed to transmit.

Any comments will be very helpful to me.

Thank you.

Chong Hui Kim.
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