Futaba Skysport 4 (T4VF

[hugo]

Hi,

I am new to the forum.

After not succeeding in getting my interface cable to work, I read a few posts on the subject but could not get an answer.

Here is what I did so far. I would like to know what to try next.

I built the interface using a 2n2222a transistor and a 10K resistor. This did not give me any luck. After disassembling it to use the plugs for the other (zener) interface, I tested the transistor and it still worked. So soldering heat was not the problem there.

I then built the interface described on the site that uses a zener between pin 10 and 18 with the stripe side connected to pin 10 and the signal from pin 4 at the transmitter connected to pin 10 of the par port via a 680 ohm resistor and the shield of the transmitter plug connected to pin 18 of the par port. (Is this correct?) While soldering the zener I clamped the leads with a flat nosed plier to prevent heat from destroying it. Afterwards I plugged the cable into the transmiiter and switched it on and measured the voltage between pin 10 and 18 with a DVM. The reading was around 4.7V

Next was the test to see if it will work. It did not. The first PC I tried it on was a DELL 1GHz on which I disabled (in the BIOS) sound, USB and everything else I thought was not needed for FMS. The second was an old Pentium 200 MHz mmx with a imitation sound card for which there are no "enable shared IRQ" setting.

What am I doing wrong ?

Best Regards

Hugo

[Steve Lewin]