Jack,
Unless you have a problem with the K3, the KEYOUT jack should have no
voltage on it either during TX or RX.
Check the KEYOUT with an ohmmeter. It should have a high resistance
during receive - then put the K3 into TEST (hold the MODE up button),
then press TUNE - the resistance should drop to almost zero.
With no cable connected to KEYOUT, you should not see any significant
voltage at the K3 - if you do, double check your DMM connections. Any
voltage during key-up (or RX) will be coming from whatever you connect
to KEYOUT - KEYOUT simply grounds the connection when TX is enabled.
73,
Don W3FPR
Jack Nelson wrote:
> Good evening. I'm attempting to use my K3 with a Tokyo High Power HL-1.2Kfx
> amp. On the amp, when STBY (which has 12v on it) is grounded, the relay
> clicks, and the "On Air" led lights....just like it should. However, when a
> cable is connected between the K3's Key Out jack, and the STBY on the amp,
> the amp shuts down with an "Over Drive" warning as soon as the K3 is keyed.
> The K3's power is passed through the amp to the watt meter and dummy load.
>
> I noticed the Key Out jack on the K3 has 4.75vdc on it whether it's in the
> Tune position or not. Is this normal. I don't think the amp likes seeing the
> voltage from the K3.
>
> 73's Jack K5FSE
> Treas QRP ARCI
>
>
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