• This web page was last updated on Sun, 10 Aug 08 at 1029 hours

The AMQRP NUE_PSK Modem is field re-programmable. The port is TTL/CMOS and requires a level shift/inverter. The P4 Kit can be easily adapted to do the job at less than half the cost of other solutions

I stock a cable from FTDI, the TTL-232R5. It is a USB to TTL serial adapter with a USB A-male on one end and a 6 pin molex KK on the other end. I sell it for use programming my Arduino/Freeduino boards. It turns out that it, too, is useful for programming the NUE-PSK Modem. Using a small generalized adapter board that I make up for general use in the shop here, it can be readily adapted.

WE now have a new USB adapter platform, from Fundemental Logic. We call it the P5. The first adaptation has been done for the NUE-PSK and is called the P5A. It is based upoin the same FTDI chip as the above cable, using the same drivers. It is a small board with a dedicated adapter board. It has a USB B-type female receptacle which requires only a standard USB cable. It is less expensive than the cable unit

If you are using the FTDI USB cable or the P5A, I strongly suggest visiting the site and downloading the most recent drivers, as of Sept. 2007 the following links are the most recent.

• Windows XP/2000/Vista
• Mac OS X PPC
• Mac OS X Intel, v 10.4 or higher
• Linux v2.4 or lower kernel only!

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• Prices below are displayed in this format [ $4 + $2 ] The number in red is the price of the item(s) and the number in black is the Shipping and Handling charges added to the item price
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  Brian Riley
  PO Box 188
  Underhill Center, VT 05490
  
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P4 - Assembly for NUE-PSK Modem

1. Simple schematic and pictorial available.
2. Complete P3/P4 manual available.
3. Holding the board with the solder tabs towards you, from right to left insert the three resistors; 180 ohms (brown-gray-brown), 22 Kohms (red-red-orange, 10 Kohms (brown-black-orange), then the Diode (black band towards chip)
4. solder and clip these leads off
5. We will not use the hexgate for the reset circuit. But we must either ground or pull up its input line to prevent the gate from randomly oscillating. So, along the left edge where you would place C2, R4, and R5. Leave out C2 ("104") and R4 (10K). Insert a clipped resistor lead as a jumper in place of R5 (10K), effectively grounding the gate input. Place C1 0.1 uF ("104"), solder, and clip excess leads
6. Carefully lay the chip on its side and push it evenly from both sides so the legs are more perpedicular to the chip rather than splayed outward as it comes from the factory. Then turn the chip on its other side and do the same
7. Align the chip with its notch towards the three rows of 5 holes end. (if you hold the PCB so you can read the words "Wulfden/ModernDevice", then the writing on the chip will be upside down). Now carefully insert the chip into the 14 holes.
8. check that all pins are through their respective holes, bend a two pins over at diagonally opposite points to hold the chip in place while you solder.
9. Solder and clip these leads.
10. Push the DB9 plug pins over the edge of the board. With some of these connectors they do not line up absolutely perfectly but well enough that they can be soldered on without making any unwanted solder bridges.
11. The Pinouts of the P4 header connector as as follows. Rows number 1 (nearest chip), 2, & 3. Pins number 1(square pad), 2, 3, 4, & 5. To wire for the NUE-PSK you will want to
    1. Cut the trace between the pads of Pin 1/Row1 and Pin 1/Row2
    2. Cut the trace between the pads of Pin 3/Row1 and Pin 3/Row2
    3. Insert jumper wire to connect Pin 1/Row 1 - TX (data to RS232) to Pin 3/Row 2
    4. Insert jumper wire to connect Pin 3/Row 1 - +3.3-5.5 vdc (power from host) to Pin 3/Row 2
    5. HINT - do one jumper on top of the board, the other on the bottom
    6. Pin 5/Row 1 - Reset - there is no connection
12. Insert the 4 pin socket header facing down, pins up though pcb inot the row three holes for pins 1-4 and solder on the top component sde, make sure its perpendicular to the plane of the pcb,