[hpsdr] munin2 questions

[Kjell Karlsen]

Sorry for the header on this mail! My e-mail program sometimes lives its  
own life.

Kjell





På Mon, 20 Jun 2016 10:39:56 +0200, skrev Kjell Karlsen <la2ni at online.no>:

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


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