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Re: MANCHESTER encosing schemes



Manchester is NRZ data X OR with data clock. If data is low or high you see 
the clock frequency the clock shifts half a cycle on each transistion. This 
was devloped for the IBM Data tape transports in the 60 of the last century. 
Its main advantage is the base line remains adverage of half the P-P of the 
data. The disadvantage is your baud rate and the modulation frequency are 
now the same rate.

Art, KC6UQH
----- Original Message ----- 
From: "RFI-EMI-GUY" <Rhyolite@nettally.com>
To: "Jim Sanford" <wb4gcs@amsat.org>; <amsat-bb@amsat.org>
Sent: Thursday, March 27, 2008 8:49 PM
Subject: [amsat-bb] Re: MANCHESTER encosing schemes


Thanks Jim!

Jim Sanford wrote:
>
> See Embedded Systems Design for Feb 2008.  www.embedded.com
> 73 and good luck!
> Jim
> wb4gcs@amsat.org
>
>
> RFI-EMI-GUY wrote:
>> Can anyone point me to some simple schemes for Manchester encoding
>> and decoding. The application would be for high speed data over a low
>> cost ISM link (manufacturer advises against long strings of data in
>> 111 or 000's)
>>
>>
>
>
>

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P


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