[hpsdr] munin pa update

[Georg Prinz]

Hi Larry,

it is a 1.85mm 25 ohm coax-cable marked up with FDR73A24.Fortunatelly,I
got it from Kjell, LA2NI. Unfortunately, I couldn't find it in the
internet. Maybe, Kjell can tell us which brand it is and where we can
get it.Or he could tell us a substitute.

73, Georg, dl2kp






Am Freitag, den 07.09.2012, 06:51 -0400 schrieb lgpignolet at aol.com:
> Hi Georg
>  
> Can you tell what wire you used for L4 design..?
>  
> tnx's
>  
> Larry
>  
> 
> 
> -----Original Message-----
> From: Georg Prinz <getpri at t-online.de>
> To: hpsdr <hpsdr at lists.openhpsdr.org>
> Sent: Fri, Sep 7, 2012 5:18 am
> Subject: [hpsdr] munin pa update
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hello,
> 
> actually I put two munin power amplifiers successfully into operation.
> 
> To those who are in a similar situation following hints:
> 
> My information is based on  two boards dated 04.03.2010 and drawing
> dated 19.04.2012.
> 
> 1. The center pad of L5 shall be grounded. See Picture munin_L5 on
> www.qsl.net/dl2kp
> 
> Drawing shall be updated accordingly.
> 
> 2. Picture munin_L4 on www.qsl.net/dl2kp shows L4 how it shall be done.
> Both ends of the secondary coil shall be facing towards T1 and T2. One
> end shall be longer to reach to the soldering pad for output behind the
> jack.The other end I soldered to nearby ground point.
> Furthermore, you see the correct mounting of T1 and T2. I put a copper
> bar beneath the MOSFETs not only for heat distribution, but also to be
> able to place drain and source connection without bending them on top of
> the board.
> 
> 3.The idling currents should be adjusted to get full power on all bands.
>   Kjell recommends for T3/4 500mA each and 1 A for T1/2 each. I am just
> experimenting around to get the correct value for my boards.At the
> beginning I didn't succeed with kjell's values to get full power.
> 
> 4. I was curious, if the output sma connector would be sufficient for
> 100W and even more.According to the data sheet it has a working voltage
> of 355V. With 200W you will get a voltage of 70V at 50 ohms.So that
> should be ok.
> 
> 
> At the end I will not forget to thank Kjell for his great development
> and all the help he gave me to get everything into operation!
> 
> Vy73,
> 
> Georg, dl2kp
> 
> 
> 
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