[hpsdr] munin design

[Helmut, DC6NY]

Hi,

Pin 4  at L4 should be not connected, apart from that the circuitry makes no
sense.

73, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Georg Prinz
Gesendet: Dienstag, 7. Mai 2013 11:04
An: FRANCIS CARCIA
Cc: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] munin design

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

Hello Frank,

L3 acts as a dc feed choke so L4 does not saturate by dc current. L8 is for
further decoupling and is important to get the L3 middle absolutely rf-cold.
This has also an impact upon the IMD. 
L3 is wound bifilar, so at dc the current flows in opposite directions and
the core does not saturate with dc eather.

In drawing dated 04/03-2010 there are two links from L8. One to L4 and one
to L3. I removed the link to L4. I guess this was a drawing done during the
early design phase. 

73, Georg, dl2kp 

Am Montag, den 06.05.2013, 16:27 -0700 schrieb FRANCIS CARCIA:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi All,
> I have a question. Why does the Munin final feed DC into the 
> transformer CT. and also use a DC feed choke. I've never seen this 
> done before and wonder why. Frank WA1GFZ 
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