[eagle] Re: CAN-Do-Too! ??????????

Howard Long eagle at howardlong.com
Tue Jul 10 13:52:52 PDT 2007


Hi Chuck 

> The naming of one "EB" is a legacy from P3D where the engineering beacon 
> was so pervasive throughout the satellite that it was decided to actually 
> name one of the user pins as such.  Part of this is also driven by P3E/P5A

> perceived requirements.  P3E has used some of the user pins to input 
> structure thermistor signals to modules that do not otherwise use all 
> of their analog input pins on the 40 pin connector.

On P3E, the EB signal goes to the P3E U/V transponder from the IHU3. In the
U/V transponder, it hits a DSP GPIO pin via a voltage level adjustment and
isolation circuit. The DSP uses this to generate the BPSK beacon.

73, Howard G6LVB



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