Hi Guys:
I was playing with my Mastr II on 6 meters, getting ready to
devise a way to get PTT from the CAS line (no controller yet).
I tried a 2n3904, but found that it loaded the CAS line. I then
remembered, from repairing TNC's, that they use a 2n7000 FET.
Knowing that the FET has a very lite loading, I tried it. It
works very well, and absolutely no false triggering.
Hoping that this may help someone, here is the scoop:
The 2n7000 has the pin-outs (with the transistor facing you):
1 2 3
Source Gate Drain
-Take the SOURCE to a good ground
-Take the GATE directly to the CAS line
-Take the DRAIN directly to the PTT line
That's it! Works well, and the CAS line doesn't drop at
all in voltage. Just remember to follow standard "anti-
static" precautions.
Now, if I could find a simple solution for the TX audio, hi!
Tedd Doda CET CEO
Lazer Audio and Electronics
packet ve3tjd@va3sed
e-mail lazer@...
