[hpsdr] Go linear!

[Roland ETIENNE]

Ken Klein a écrit :
> ***** High Performance Software Defined Radio Discussion List *****
>
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> ......
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> 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.
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> 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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