K3 12 VDC OUT (Switched)

[GW4DVB]

Just a quick question on the 3 12 VDC OUT (Switched)

Is it really switched? - I'm only asking as it seems to be permanently sitting at 13.8V

I am trying to switch off an accessory on keying the K3 ... is there another way ?

Thanks

[Don Wilhelm]

The 12VDC output turns on when the K3 is powered.  When you turn power
off the K3, it should also turn off.

If yours behaves differently, there is a problem.

73,
Don W3FPR

On 7/3/2016 11:09 AM, GW4DVB wrote:
> Just a quick question on the 3 12 VDC OUT (Switched)
>
> Is it really switched? - I'm only asking as it seems to be permanently
> sitting at 13.8V
>
> I am trying to switch off an accessory on keying the K3 ... is there another
> way ?
>
>

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[Joe Subich, W4TV-4]

On 7/3/2016 11:09 AM, GW4DVB wrote:
 > Just a quick question on the 3 12 VDC OUT (Switched)
 >
 > Is it really switched? - I'm only asking as it seems to be permanently
 > sitting at 13.8V

Yes, it is switched with the POWER switch on the K3.

If you look at K3 RF Board (3 of 4) schematic, the feed to the +12V Out
jack comes from the drain of Q2.  Q2 is the 12V switch to the K3 and
is controlled by the /PWR_ON line (Power switch and control processor).

73,

    ... Joe, W4TV

On 7/3/2016 11:09 AM, GW4DVB wrote:

> Just a quick question on the 3 12 VDC OUT (Switched)
>
> Is it really switched? - I'm only asking as it seems to be permanently
> sitting at 13.8V
>
> I am trying to switch off an accessory on keying the K3 ... is there another
> way ?
>
> Thanks
>

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[Bill Frantz]

The 12VDC OUT RCA jack (lower left side of the back panel) turns
on when the K3 is turned on and goes off when it is turned off.

The KEY OUT RCA jack (lower right) allows you to switch
accessories with the change from receive to transmit. I believe
it goes to low resistance when the K3 goes into transmit mode.

I hope this helps.

73 Bill AE6JV


On 7/3/16 at 8:09 AM, [hidden email] (GW4DVB) wrote:

>Just a quick question on the 3 12 VDC OUT (Switched)
>
>Is it really switched? - I'm only asking as it seems to be permanently
>sitting at 13.8V
>
>I am trying to switch off an accessory on keying the K3 ... is there another
>way ?
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[Jim Brown-10]

On Sun,7/3/2016 9:11 AM, Bill Frantz wrote:
> The 12VDC OUT RCA jack (lower left side of the back panel) turns on
> when the K3 is turned on and goes off when it is turned off.

Yes. I use it to drive a relay that switches power to a lot of shack
accessories, like antenna switching relays, a Beverage preamp, the band
decoders for my bandpass filters, computer video monitors, etc. I did
that when I found that the relatively small but constant drain running
24/7 was depleting much of the charge my solar panels was putting into
my batteries!

73, Jim K9YC

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