[hpsdr] Go linear!

[Edward J White]

Hi Gang:
I also vote linear. 
What one of the design team can do id maybe make a PC of the regulates and all we have to add is the transformers in the enclosure and we will have a PS for the entire project Clean and healthy
Ed
WA3BZT
  ----- Original Message ----- 
  From: Roland ETIENNE 
  To: Ken Klein 
  Cc: hpsdr at hpsdr.org 
  Sent: Sunday, June 10, 2007 3:16 PM
  Subject: Re: [hpsdr] Go linear!


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

  Ken Klein a écrit :
  > ***** High Performance Software Defined Radio Discussion List *****
  >
  >   
  >
  > ------------------------------------------------------------------------
  >
  > ......
  >
  > So I vote linear. IMHO, it’s cheap, dirt simple, and quiet. A little 
  > heavier, maybe, and perhaps a tiny bit bulkier, but it’s much cheaper 
  > and cleaner. Remember that we are in an environment where quiet is 
  > paramount.
  >
  > ------------------------------------------------------------------------
  > Ken, 
  >   

  I agree 100%.!! I spent a few hours this week-end to modify my 
  installation, integrating an Atlas-Lite (Thanks Barry!) with Janus-Ozy 
  in the same box with my sdr1000 100 watts.
  I suppressed the 5v reg, 12 v reg and L1, L2, L3 to isolate the DC/DC 
  converter on the PIO board, and now my stack is powered by a linear 
  +5/+12/-12 volts power supply. For the moment, it is an external one, 
  but I think I have the place in the box to put an internal one. The 
  current consommations are (SDR stack and Janus-Ozy) approx. 700 ma on 
  5v, 400 ma on +12v and 100 ma on -12v.
  The 100 w amplifier and the tuner are powered by a standard switching 
  13;8v power supply.
  With this config., no more "travelling humps", spikes and DC noise. The 
  receiver is very quiet.

  I have uploaded a few photos on my directory on hamsdr.com.

  73, Roland f8chk.



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