Hi, One way to help this is to use a reed relay or opto isolator to
isolate the controller lead from the radio ptt. I am guessing that
if you disconnect the ptt lead from the controller that the led goes
out. The radio ptt circuitry is pulling the ptt lead low enough to
draw current through the led. -Jon-
--- In Repeater-Builder@yahoogroups.com, Glenn Maclean <wa7...@...>
wrote:
>
> I am putting a 220 repeater together using an ICOM IC-RPP2210. The
> repeater is working except the PTT LED remains illuminated all the
time.
> It goes ever so slightly brighter when the repeater is keyed up. I
> measure 1.56 volts dc at the PTT line between the controller and
> repeater un-keyed. I measure .67 volts dc when the repeater is
keyed up.
> I have tried applying 12 volts to a 10k ohm resistor with the other
end
> connected to the PTT line with no change. The PTT LED remains on. I
even
> tried a 1K resistor in the same configuration. The PTT LED remains
on.
> The repeater is transmitting and receiving just fine with the RC210
> controller.
>
> Any suggestions?
>
> Thanks,
> Glenn
>
