K3 KEY OUT, hi or low on TX?

[WW3S]

Does the KEY OUT jack go HI or LO during transmit?
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[donovanf]

Hi Jamie,


Neither...


KEY OUT is connected to an IRF630 power MOSFET which has
"on/off" states, not "HI/LO" states.


During receive its in the off state, sinking less than 50 microamps
from the load connected to KEY OUT.


During transmit its capable of sinking ("grounding") up to 200 volts
at up to 5 amps continuous from the load connected to KEY OUT.


73
Frank
W3LPL





----- Original Message -----

From: "Jamie WW3S" <[hidden email]>
To: [hidden email]
Sent: Friday, January 4, 2019 8:45:22 PM
Subject: [Elecraft] K3 KEY OUT, hi or low on TX?

Does the KEY OUT jack go HI or LO during transmit?
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[Don Wilhelm]

Jamie,

It will short the active wire to ground.

The KeyOut does not source any voltage, it is like a switch, it is
either open or closed.  Any voltage is sourced by the amplifier or other
external device.  It will only work with a positive voltage.

The voltage and current listed in the specifications are the greatest
that the FET can handle.

73,
Don W3FPR

On 1/4/2019 3:45 PM, Jamie WW3S wrote:
> Does the KEY OUT jack go HI or LO during transmit?
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