[NLRS] Power on 5760 MHz

[Dr. Gerald N. Johnson]

I expect to know more about QFN assembly by spring. After some 
experiments with cheaper parts. I'm wondering about old fashioned 
methods of sweating, like by applying solder, then wicking most of it 
off rather than using solder paste which tends to be expensive, and have 
short shelf life because the flux attacks the huge surface area of the 
tiny granules. And vendors are partiular about how thick solder paste is 
applied through a window in a stencil. A great technique for production, 
not easy for one off. Then I'd go to reflow the parts that can't be hand 
soldered.

A thermostatically controlled lab hot plate with a bit of aluminum plank 
for a heat spreader seems like it may be very handy, though many an 
electric skillet has been applied with a slab of 1/8" or 1/4" aluminum 
as the heat spreader to make the heat at the board more uniform. An IR 
no contact thermometer is probably the handiest temperature check, 
though some sort of temperature indicating crayon may be as good and 
less costly if it can be located for the right temperature.

73, Jerry, K0CQ


On 11/8/2012 10:02 AM, tosca005 at umn.edu wrote:
>
>
> Jerry:
>
> Thanks for setting me straight on this. It sounds like it is well beyond my
> abilities to work with, so I should scrap the idea. I guess it's like they
> say, if it sounds too good to be true, it probably is exactly that! :)
>
> 73 de W0JT
>
>