[GreenKeys] Interfacing with the teletype...for newbies [M26 newbie, part 2]

[Harold Hallikainen]

Thanks! As noted at
https://w6iwi.org/rtty/DspTU2/#:~:text=current%20transmit%20state.-,PCB%20Bringup,-This%20project%20has
, I'm using a hot air soldering tool. I put a thin bead of solder paste
down along the rows of pads, then CAREFULLY position the chip. Under a
microscope, I shove the chip back and forth until all the pins are
centered on the pads. I then hit the whole chip with hot air (using a
"tip" that has a large square end that heats the whole chip at once).
There are typically a few shorts between some pins. Dragging a soldering
iron chip between the pins moving away from the chip body clears the
shorts. If there is too much solder to clear that way, solder wick pulls
away the excess solder.

I've now assembled two boards, one Rev A, and one rev B. Bill, KE3BK has
also assembled a Rev A board and has it working.

THANKS!

Harold


On Mon, July 1, 2024 4:07 pm, Gerry Block wrote:
>  Harold I am admiring from afar the work you have done on your TU.
> I don't know what method you are using to actually solder the
> flatpack.  
> The 'easy' way is to place the package and tack solder two corner pins
> till it is where you want it.
> Then flood one row of pins at a time with liquid flux
> Drag a loaded soldering iron tip across the pins.  You can do an entire
> row in about 5 seconds.
> Metcal used to even make a special tip with a small solder reservoir in
> the end (i.e. a hole) for this purpose...
> RegardsGerry Block
>     On Monday, July 1, 2024 at 10:31:57 AM PDT, Harold Hallikainen via
> GreenKeys <greenkeys at mailman.qth.net> wrote:
>
>  I agree that the very inexpensive terminal units on eBay and the XR2211
> circuit will do the job. I used the XR2211 in several products I designed
> in the late 1970s and 1980s. Very nice chip!
>
> If you'd like to try some surface mount soldering, you could try my DSP TU
> ( https://w6iwi.org/rtty/DspTU2/ ). I have a few bare boards that could be
> free to a good home. I use it on the air daily. I'm working on the WiFi
> code so it can copy ITTY without an external computer.
>
> Harold
> https://w6iwi.org
>
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