Saturday, 3 April 2010

Softrock Ensemble TRX Modification to the Si570 output.

Modification needed for the Si570 output.

Tony just let me know CLK+ (pin 4) should be connected via a 0.1uF and not direct to T1.

"...Mike Collins did a design review on the RXTX Ensemble and pointed out the a direct connection to the CLK+ output of the Si570 is not allowed in the manufactures spec of the part. The fix is to cut the trace that connects the CLK+ pin of the Si570 to T1. With the trace cut, a 0.1uF capacitor may be soldered between the CLK+ pad and the T1 via. Care should be exercised to make sure the capacitor does not short to the USB ground plane on that part of the circuit board...."


So I modified the build.

Cut a track and stripped away the surrounding PCB and soldered a 0.1uF across the gap. Ugly but it works.


This short video shows the output still fine.


at

2 comments:

  1. Anonymous16 June 2012 at 12:35

    Hi

    I am building a Softrock RXTX rith now and look for some support. I have an unsolved issue with tuning the Si570.

    Is this blog still alive and somebody there who could give me some advise?

    dl2k

    ReplyDelete
  2. M1KTA17 June 2012 at 11:36

    I'd seriously post any question on the Softrock yahoo group but you can ask here and I'll try and advise. I will not publish and comment if you don't want.

    ReplyDelete