[hpsdr] Penny vs Penny lane

[Phil Harman]

Hi Frank,

You suggestion would indeed work. Pin 201 is a PWM DAC that is filtered by
the following RC networks and the op amp.

Just select PennyLane in your PC software and you would be all set.

73 Phil...VK6APH




> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi all,
> I am glad to read both use the same FPGA code. I was just looking at the
> schematics and it looks pretty easy to add the ALC to the D/A off pin 201
> of the FPGA. A dead bug op amp should do it. Can I assume pin 201 is
> generating a pwm signal that is integrated by the RC? I suspect the op amp
> was needed to get a sink signal to draw current from the D/A reference
> reducing the bit weight.
> Yes Penny will not have the two stage output amp but that would give it
> real ALC without hurting IMD. 
> frank WA1GFZ_______________________________________________
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