[AMRadio] Another question, this time Desk KW

[Nick England]

Yep, the key line from the Ranger is a single wire switched to AC Hot. AC
neutral is KW chassis ground. The manual says that if the KW doesn’t key,
just flip the Ranger AC plug over.

You sure couldn’t get away with that these days!

On Tue, Jul 27, 2021 at 11:44 AM Robert Nickels <ranickels at gmail.com> wrote:

> On 7/27/2021 10:31 AM, CL in NC via AMRadio wrote:
> > According to him, the only issue is now, when he turns on the filament
> power, the B+ comes up also, without keying it.  Before I download a
> schematic and bring out the Ouija Board, is anyone familiar with this
> problem and knows exactly what is wrong?
>
> A switched 110VAC voltage from the exciter is used to activate the plate
> relay via pin 8 of the octal connector on the Desk Kilowatt.   With a
> Ranger this voltage is normally acquired from the top pin of the antenna
> relay connector on the back of the Ranger (i.e. crystal socket).   This
> line should have 110VAC on it only when the Ranger is keyed in TX mode,
> exactly like you'd use to energize an antenna relay.
>
> Have your friend disconnect that wire and you'll know whether the
> problem is in the Ranger or in the Kilowatt.   The plate relay control
> voltage from pin 8 is routed through the interlocks, overcurrent
> protection relay contacts, etc in the desk so if it still pulls in with
> the external keyline disconnected, you'll need the schematic and to pull
> the pedestal out for some floor-level troubleshooting.
>
> 73, Bob W9RAN
>
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-- 
Nick England K4NYW
www.navy-radio.com