[hpsdr] Line level vs. mic input on Penelope and Hermes

Rod Brink kq6f at comcast.net
Thu Jan 24 09:36:00 PST 2013

Hi Duane -

When I first got my Hermes I ran comparisons between xmit audio fed into the mic jack vs. Line In.  I recorded and played back using a second SDR.  I couldn't hear any difference.  However, I'm using an auxiliary audio rack with line level outputs and so wound up with Line In fed into the 25-pin connector.  It works fine.  But either way sounds the same....

Rod KQ6F
  ----- Original Message ----- 
  From: Duane - N9DG 
  To: hpsdr at lists.openhpsdr.org 
  Sent: Thursday, January 24, 2013 9:05 AM
  Subject: [hpsdr] Line level vs. mic input on Penelope and Hermes

  ***** High Performance Software Defined Radio Discussion List *****


        For those who have or are using the line level inputs for the Penelope and/or the Hermes is it worth the extra effort in terms of having better quality TX audio?

        I like the idea of using line level mic audio inputs on these boards, but am questioning if it is worth the extra effort to make up the cabling and connectors to interface with them vs. using the comparatively easier to work with 3.5mm mic inputs.

        I'm in the process of re-working all of my mic signal handling throughout the entire shack and am striving to use balanced line levels throughout the system for as much of it as I can, and then only transitioning to unbalanced and/or mic level inputs to the individual radios as necessary. I will be using W2IHY IBox interfaces for each radio.




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