[hpsdr] More Munin...

[n3evl]

Hi Larry,

I did all the soldering with a standard fine tipped soldering iron - 
HAKKO FX-888 with one of the T18 series tips.  I use small pieces of 
solder snipped off to the approx size of the pads; for the passive 
components such as resistors and capacitors, I place the component on 
the pad, position a piece of solder next to one end; hold the component 
down with a toothpick; apply the iron to pad/component/solder; with that 
end secured, I do the other end - iron in one hand, solder in the other. 
  I do something similar for the other SMT components - basically 
getting one leg or wire or whatever soldered down so the component won't 
move, then do the remainder.  I use a pair of magnifying glasses.  It 
takes a bit of practice getting used to holding the component down with 
the toothpick - you've got to get the angle and pressure right but it 
generally works and gets the job done.  I could not do this without the 
magnifying glasses or fine tipped iron + fine solder.  One or two of the 
components were cylindrical instead of the usual flat shape so the 
toothpick was not so well shaped for them - next time I do something 
like that I'll make a suitably shaped holding-down device maybe from a 
wooden Popsicle stick with a v-shaped groove.

The wire for the final transformer L4 was as supplied by Tim O'Rourke, 
W4YN, who was kind enough to supply me with most of the components for 
the Munin AMP.  According to the BOM, it is AVG22 25 ohm coax.  I have 
some pictures of the windings if needed.

Let me know if I can be of further help.

73, Pete, N3EVL


On 2/6/2013 5:46 AM, lgpignolet at aol.com wrote:
> Hi Pete...
> Couple of Q's for you..
> Q. Can you tell me what you used to do all the soldering with..?
> Q. What did you use for coax/wire on the output xfrmr...?   Everywhere I
> looked I couldn't find anything that would fit inside the core..?
> Tnx's
> Larry  N1AXB
> -----Original Message-----
> From: n3evl <n3evl at townisp.com>
> To: HPSDR list <hpsdr at lists.openhpsdr.org>
> Sent: Tue, Jan 29, 2013 10:25 am
> Subject: [hpsdr] More Munin...
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> I recently completed my Munin amp and actually got on the air with it
> this past weekend.  Got some good reports on 40m and 80m.
>
> My setup is Alex based - Mercury, Penelope, Metis, Excalibur with
> Penelope now driving Munin instead of PennyWhistle.
>
> I still need to do some checkout on the other bands but looking good so
> far.  May try and get hold of a 24V PSU as mentioned by Kjell but for
> now, happy to have HPSDR with 100W capability.
>
> I posted a couple of pics on HamSDR: see <
> http://www.hamsdr.com/profile1.aspx?id=1901  >
>
> Munin is in a TenTec cabinet with a rear-mounted fan.
>
> 73, Pete, N3EVL
>
>
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