[hpsdr] munin2 questions

[Kjell Karlsen]

Teflon ci Alain-Michel.

I´ll strongly advice that you use the "ICOM" version of the transformer!  
It has RL >15 dB from 1,5-50 MHz. You find some pictures on hamsdr.com  
5/11-2015. I´ll send you a recording directly  of the VNA measurements I  
have done.

For the 4 secondary turns please use shielded AWG 16 or 14 cable as the  
ideal impedance is 12,5 Ohm. Teflon isolation is the best but other cables  
works OK.

I see no difference between feeding the DC from the center of the  
transformer or using a bifilar wound L3.

If you measure the RL from the antenna side, the impedance should be 50  
Ohm for calibrating.

Good luck!

73, Kjell





På Sun, 19 Jun 2016 23:42:14 +0200, skrev Alain-Michel.Jolivet  
<a.m.jolivet at free.fr>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> from F4GQY
>
> Hello everybody
>
> I finished mounting munin2 and test it using MUNIN2 Update 5/5 2015  
> procedure. T4 is BN-61-002 made with single braid of silvered copper and  
> 4 turn one millimeter silvered copper teflon isolated. The result is far  
> ( RL is about -8db) of  expected , despite using several values of c //  
> primary and c drain to GND
>
> Question 1: which version of schematic have you used (07/05/15) with  
> power supply connect at the middle primary of L4 and L3 10T secondary,  
> OR (04/12/13) with power supply connected to L3 2 x 8T secondary?
>
> Question 2: what is the best between both versions ?
>
> Question 3:  using analyser, what is the value of "Z" do you use to  
> calibrate it ?
>
> Thank you very much to help me.
>
> 73
>
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