[OZAPRS] FW: APRS tone encode question

Richter, Mike W Michael.Richter at team.telstra.com
Mon Aug 23 20:24:37 EST 2004


Maybe there isn't enough room in memory to code 16 steps, even though the
hardware is there ?

Mike VK2BMM



-----Original Message-----
From: Andrew Rich [mailto:vk4tec at tech-software.net]
Sent: Monday, 23 August 2004 7:43 PM
To: Ozaprs at Marconi.Ics.Mq.Edu.Au
Subject: [OZAPRS] FW: APRS tone encode question




-----Original Message-----
From: Andrew Rich [mailto:vk4tec at tech-software.net]
Sent: Monday, 23 August 2004 7:40 PM
To: TAPR APRS Special Interest Group; TAPR PIC Development Special
Interest Group
Subject: APRS tone encode question


I threw the tinytrak audio onto a CRO and compared it to a sine wave from
a
sig gen.

How come a DAC ladder network of 4 resistors only produces 8 steps ?

Should it not end up being 16 steps ?

0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111

image

http://www.tech-software.net/139_3935.JPG

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