A question regarding Manchester encoding since it was mentioned and we are
currently
implementing it.

In Manchester encoding, '0' are transmitted as two periods of T with a
transition between them and '1' are transmitted as one period of 2T (and of
course a transition between the bits).

Is there any advantage for Manchester encoding compared to an a similar
encoding where '0' are transmitted as only a single T period ? That is, '1'
are transmitted as 2T period, '0' as a single T period and the transition
are only between the bits, never in the middle of a bit ?

Looks like the second encoding is easier to implement, uses the same
bandwidth, faster in most cases and allow the same accuracy of clock
extraction/tracking.

Thanks,

Tal

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Luc Bolly
> Sent: Thursday, May 23, 2002 3:50 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:RF transmission
>
>
> Hello all,
>
> Thank you all for your informations. I will do a first test with a
> software solution and a manchester encoding. It seems to be quite easy
> to implement and it is costless. The only drawback is that both PICs are
> busy during the synchro + transmission.
>
> If someone still have an idea, don't hesitate (take this into account:
> I'm using ASM (MPLAB) to program the PICs, the transmission is AM
> modulated in 433 KHz).
>
> The thing I don't understand is that the two components are sold
> together and the receiver has a "digital" output. In my (too simple)
> point of view, this was a complete way of sending data across the air
> without coding anything. But I just receive a square wave (the carrier).
>
> Luc Bolly
>
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