> As my Henry has both reed relays and vacuum,
> presume I could set it up as I had with the 87A,
> and use full QSK key from a link between the Omni
> TX en and TX out sockets. A diode in series with
> this jumper running over to the 87A relay input
> worked just fine. Of course, the 87A is diode
> keyed.
Regarding amp interfacing with the Ten-Tec Omni Six (Plus):
Unless the amp has internal protection against hot-switching, I strongly
recommend:
1) Bypassing the Omni's internal amp relay, using the preceding driver
transistor as an open collector to the rear panel RCA amp-line jack.
2) Rather than sample at the TX EN/TX OUT point, sample the "T" voltage on
the Omni's Control Board. Yes, this is an invasive modification whereas the
"Y" adapter/steering diode method at the TX EN/TX OUT point is not, the end
result is well worth the effort. The "T" voltage is generated by a complex
circuit on an alternate circuit board that takes into consideration the
integrated ramping of the keyed waveform.
With many amps, sampling at the preceding TX EN/TX OUT point will cause hot
switching. Of course, you can always keep the Omni's internal relay, set
it's duration from the menu and live with the noise of a telegraph sounder.
Although I personally favor a good, fast vacuum relay, operating an Omni Six
with this mod into an Alpha 87A is entirely noise free and an absolute joy
to operate.
-Paul, W9AC
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