On Sat, May 31, 2014 at 10:37 AM, Michael Rapp <mdrapp@gmail.com> wrote:
> Would there be a problem with the PTT line from the Signalink and the PTT
> line from the W3YY box being connected to the PTT pin on the FT-950 at the
> same time? They obviously wouldn't be keyed/carry a signal at the same
> time.
>
I have never seen a PTT radio input that couldn't be attached to multiple
devices (I suspect there is the inevitable older rig that had an issue, but
certainly not a late model Yaesu).
It's almost always a "wire-OR" situation with a pullup resistor in the
radio just waiting for any signal to pull it low and key the rig.
Similarly at the devices these are wired in an open-collector arrangement,
just for this reason. I would expect both those devices to have open
collector drivers (or open drain) on the PTT - as opposed to an active
driver pulling up the signal - but it wouldn't hurt to double check.
Good luck - 73 jeff wk6i
--
Jeff Stai ~ wk6i.jeff@gmail.com
Twisted Oak Winery ~ http://www.twistedoak.com/
Facebook ~ http://www.facebook.com/twistedoak
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