PTT conection

[Larry Tyree]

> I was trying the PTT conection with no luck.
> I made a circuit like for the keyer.
> Paralel port. The ground is the same than the keyer.
> Pin 16 to the 1K resistor and the resistor to the base of a 2N2222A.
> Pin  1 to the emiter.
> And the colector connected to the PTT in the transceiver (TS-850).
> Is this OK ?.  Because after I did it I found there 4 Volts in the colector
> while I don't transmit (????). And 0 Volts when I transmit.

This sounds right - when it is at zero volts, does your transmitter 
relay turn on?

If not - you might find you actually have about .4 or .5 volts on the
collector and that might be too much.  You can connect the emitter
directly to ground instead to lower that voltage.

Tree N6TR
tree@contesting.com