PSK31 Webpage
Above you will see my PSK31 Interface. It is
built inside of a Sucrets box. The circuit is built "Deadbug" style, which
is actually very good construction technique. I used a Dremel tool to cut
"Islands" or "pads" . I was able to solder the legs and wires to
the different parts with little dificulty. I used basically three
circuits, I used the two small audio transformers, one is the 600/600 ohm
1:1 transformer, the other is the
1000K/8ohm transformer, I used the 47k mini potentiometers from Radio
Shack to vary the audio in/out, the
circuit I looked at used 50K potentiometers. I used the 4N26
opto-isolator circuit to do the keying from
the computer of the radio for transmit. I mounted the 4N26 on a piece of
perfboard with holes already drilled, I made a couple of legs and
soldered the keying section sideways on the ground surface of the main
board(it's located in middle on side away from the lid
hinge)
The picture to the left is about a
P-4, I transmitted this from camera to computer
via 915 mhz ATV.
This is a layout for the basic circuit
I used for the PSK31 interface
board. You see the copper section is exact
size, the white lines represent the
copper that is removed by the dremel creating the "Islands". The images on top represent the parts layout , this one particular circuit will work with the Radio Shack HTX-202 HT. Reference WWW.PACKETRADIO.COM for the schematics for the three circuits(Keying,Transmit,Receive) (The connection between the two resistors near the A+ position is the two leads from the resistors twisted and soldered, they are not hooked to the grounded section of the interface).
