[hpsdr] solder Janus

[KD5NWA]

There is a easier way.

< http://www.qrpradio.com/projects.htm >

On Sat, 2006-06-03 at 12:37 -0700, Christopher T. Day wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Here are some notes I made while assembling the RefLock II board. I
> believe there are no parts on Janus that are any smaller. The RefLock II
> did come with the CPLD already soldered on, but having done a few lower
> pin count SMD ICs I suspect the "tack one pin, tack opposite pin,
> slobber solder across the pins, remove excess with solder wick" approach
> will work for them.
> 
> 
> 	Chris - AE6VK
> 
> Assembly notes
> 
> Tool suggestions:
> 
> A magnifing lamp or equivalent. The parts and silk-screen markings are
> quite small.
> 
> A pair of tweezers with sharp points and a soft squeeze. Check local
> cosmetic boutiques. If the tweezers are too stiff, there will be a lot
> of energy stored in them while you are trying to manipulate tiny parts;
> a slip will send the part flying into oblivion.
> 
> Some kind of "third-hand" to firmly hold the circuit board while you are
> soldering parts. I used a Panavise with circuit board holder head.
> 
> One, preferably two, sharp tipped 15W soldering irons. I got mine at
> RadioShack.
> 
> In a few cases, 15W will not supply enough heat so something bigger will
> be needed. I used a small 100W soldering gun; I would be careful going
> to higher power, and 50W is probably sufficient.
> 
> A non-clean flux pen is handy. I found a Kester #951 pen at my local
> RadioShack.
> 
> Keep the tweezers non-magnitized and the tips clean of adhesive from the
> parts pages. It can be frustrating to place the part perfectly and then
> not be able to let go of it.
> 
> Keep the soldering iron tips sharp, and clean with a damp sponge, cloth
> or paper towel.
> 
> Use anti-static precausions. Ground yourself just before touching
> components, or use a grounding wrist strap. The CPLD at least is static
> sensitive.
> 
> For soldering techniques, I basically followed the procedures described
> at http://www.tapr.org/~n7hpr/dsp-10. I particularly like the twin
> soldering iron technique for handling SMD resistors and capacitors. One
> modification I made to the process was to put down some flux _before_
> tinning the pad and placing the components. The parts in this project
> are smaller than those on the DSP-10, and these tend to stict to the
> flux pen.
> 
> It should take no more than a second or two with the irons to melt the
> solder for each of the small parts. Don't linger as the small pads will
> delaminate if too much heat is applied.
> 
> 
> 
> -----Original Message-----
> From: khmlist [mailto:khmlist at broadpark.no] 
> Sent: Saturday, June 03, 2006 11:40 AM
> To: hpsdr at hpsdr.org
> Subject: [hpsdr] solder Janus
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Reading thru the wiki for HPSDR, I was wondering what tools one must 
> have to solder Janus and the rest? I assume that "a small soldering 
> iron" is not enought, as some part is realy small. Would there be any 
> chance to order those board with preasembly of the "dif parts"?
> rgds
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-- 

Cecil
KD5NWA
www.qrpradio.com


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