[hpsdr] MUNIN2 Update.

[Kjell Karlsen]

Hi Helmut.

Yes, I know that and therefor I prefer to use AWG16 Teflon cable shielded  
with braid taken from RG316. According to the formulas for calculating the  
impedance, this cable is between 12 and 16 Ohm and gives slightly better  
performance than 25 Ohm coax. Just different values for the compensating  
capacitance and less bandwidth but still OK on 50 MHz. I have not found  
any low impedance cable with the right dimensions. The holes in BN-61-002  
does not permit cable larger than ca 2.5 mm Ø.

73, Kjell






På Fri, 22 May 2015 18:54:48 +0200, skrev Helmut <dc6ny at gmx.de>:

> Hi Kjell,
>
> you know that the optimal impedance of an 1:16 transformer should be
> sqrt(Z1*Z2) = 12 ohms. Please note that PCS-electronics also offers other
> low impedance Teflon cables 12, 18, 22, 24 ohms.
>
> 73, Helmut
>
> -----Ursprüngliche Nachricht-----
> Von: Kjell Karlsen [mailto:la2ni at online.no]
> Gesendet: Freitag, 22. Mai 2015 18:20
> An: 'Aivars Straupe'; 'OpenHPSDR'; Helmut
> Betreff: Re: [hpsdr] MUNIN2 Update.
>
> Hi Aivars and Helmut.
>
> Thanks to Helmut, I did not know of this company!
>
> Aivars: Use the flexible cable with 2.45 mm outer diameter. If it is
> difficult to get 4 pieces through the holes in the core, the outer
> insulation can be removed. Get 1 meter, then you will have some in  
> spare,may
> be you need it for a 300W LDMOS PA!
>
> 73, Kjell
>
>
>
> På Fri, 22 May 2015 18:02:31 +0200, skrev Helmut <dc6ny at gmx.de>:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi Aivars,
>>
>> you can get among other RF stuff 25 ohm coaxial cable in small
>> quantities here:
>> http://www.pcs-electronics.com/coaxial-cable-connectors-c-40.html?osCs
>> id=db5698106b2043e1ae253c509bce7d57
>>
>> 73, Helmut, DC6NY
>>
>>
>> -----Ursprüngliche Nachricht-----
>> Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von
>> Aivars Straupe
>> Gesendet: Freitag, 22. Mai 2015 13:19
>> An: OpenHPSDR
>> Betreff: Re: [hpsdr] MUNIN2 Update.
>>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi Kjell!
>> I would like to ask about Munin update. Cable for transformer, where
>> to better get those? I found on Aliexpress only one seller for 25ohm
> coax).
>> Necesarry cable lenght? But anyway, I think they sell not less than
>> one meter, I guess. That shoul be enough. About changes on schematic.
>> Would you be so kind, please, and make PDF(make red color to changes)
>> or at least list of changed parts.
>> I guess, I found most of them, but who knows ;-) And HiRes image of
>> Munin could be excellent, to understand best placement for changed  
>> parts.
>> I saw that one image, but there are only a part of Munin.
>> What about PS, are there 24V or 13.8V?
>>
>>
>> 73!
>>          Aivars.
>>
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