pa0r

I am still getting mail about my interface circuit of the OMNI VI to the QSK5 + ALH 811 which I published on the web some 5 years ago... Now the OMNI VI's are changing hands as a second hand item (I have one for sale if you need one), the problem resurfaces. It turns out that the ALH 811 is not the only linear which shows wrong timing when interfaced with the TX OUT/ TX ENABLE connectors on the OMNI. A quote from the article:

The OMNI (+ the AMP) still produce output when the TX OUT output is already high, switching the QSK5 to the receive position. Luckily, this effectively destroys the small fuse lamps. To delay the switch point from TX to RX a capacitor of about 10 microfarad and some diodes (1N4148) are used. (The TX enable must not be delayed).

It turns out that the same circuit is necessary for interfacing the ORION to the QSK5/Ameritron combination
so I am republishing it here. This circuit gives me full QSK at > 40 wpm with the ALH811 + QSK5.

Hmmm?? QSK with the ALH 811??? Read all about it here...