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Fodtrack group now available on Yahoo! It's fun and free!
I built my Fodtrack interface in February 2006 after discovering this interface and software in late 2005.
I purchased my printed circuit board (PCB) from Far Circuits
The 7528 A/d converter and other ICs were purchased from Jameco
All other components were obtained locally, or found in my 'junk box'. A complete list of components, sources and part numbers is listed below.
My Fodtrack interface
I've been working lately to connect my Fod board to my rotators. I
have a CDE/Hygain Ham II for azimuth and a Yaesu G500a for elevation.
I've built a relay board which houses four relays, one each for UP,
DOWN, LEFT and RIGHT.
It was very easy to connect the Yaesu rotator to Fod. I had to
make a simple mod to my rotor box, to bring the 'common' 29 VAC line
to the rear panel. I found that although the rotator and control box
both use 8-wire terminal strips that only wires 1-6 are used!
I connected the 29 VAC line to pin 8 of my control box. Connecting
this to pins 4 or 5 moves the rotator..
The Ham II was a bit more work, as the brake must be released before
the rotator can be moved. This brake release switches 110 VAC, and I
did not want this switch being made in the Fod box. I wired up a 12
volt relay inside the Ham II box to handle the brake release.
I connected to the Clockwise (CW) and Counter-Clockwise (CCW)
switches in the Ham II box, and brought all 4 wires (two relay coil wires,
rotator CW and CCW) out through a hole in the rear panel. Once the
brake is released, connecting pin 2 on the terminal strip to either of
the CW or CCW wires will move the rotator.
Due to the brake release, I also had to use DPST relays for the Ham
II rotor. Not finding those anywhere, I bought DPDT pcb-mount relays
from Radio Shack $5.49 ea..
The rotor pot in the Ham II was also not compatible with Fod. It
uses a 0-13 volt scale instead of the 0-5 volt needed for Fod. I
built a simple voltage divider with 3 resistors. Works FB..
Please
email me
with your results also!
73 and good luck!
Fodtrack shopping list
Radio Shack
-----------
1 qty 276-1770 +5 Volt Regulator (7805) $1.59
1 qty 271-1335 10k Ohm resistors (Pkg of 5) $.99
2 qty 272-1025 10 uf Electrolytic Capacitor $.99 each
1 qty 276-1999 14 Pin IC Socket (Pkg of 2) $1.29
1 qty 276-1995 8 Pin IC Socket (Pkg of 2 - only need 1) $.69
1 qty 276-1991 20 Pin IC Socket $.69
1 qty 276-1770 +5v regulator $1.59
4 qty 276-1620 1n914/4148 diode (Pkg of 50) $2.59
4 qty 276-2016 2n3904 NPN transistors. Fod calls $.69 each
for BC546 transistors (unavailable in my area)
FYI- pinout of 2n3904 is backwards from BC546.
Jameco
------
1 qty 290087 TLC7528 A/D converter $2.75
2 qty 23683 LM324 $.28 each
1 qty 23966 LM358 $.24
Far Circuits
------------
1 qty Fodtrack PCB $4.50
Kyle
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