[Elecraft] K3 - ACC Connector - Band0-3 output indicator

[Joe Subich, W4TV]

> Has anyone built or bought some kind of 4-indicator for this? I want
> to do this as a temporary indicator while I am playing with a pair of
> UM BCD-14 band decoders.

Easy enough ... 4 NPN transistors - base to BAND0-3 pins, LED and
limiting resistor between +13.8 and collector of the transistors,
emitter of the transistor to ground.

 > The 0000 output on the KIO3 for 60M has me concerned.

Don't know why it should concern you.  0000 is just another state
and I don't see 0000 used for any other band *or* any transverter
band.  Your bigger concern might be the reuse of one of the other
band values for 2 Meters depending on how you decode HF vs. the
transverter bands.

73,

    ... Joe, W4TV


On 1/27/2013 6:29 PM, N2TK, Tony wrote:
> I would like to see (LED) the state of the BAND0-3 outputs. Has anyone built
> or bought some kind of 4-indicator for this? I want to do this as a
> temporary indicator while I am playing with a pair of UM BCD-14 band
> decoders.
>
> The BAND0-3 outputs come off of 5V through 2.2K pull-up resistors with a 220
> ohm resistor in series with the output on the ACC socket. It would seem
> standard 20ma LED's would not work here with the 2.2K resistor inline. Maybe
> a diode inline to isolate with a separate supply on the LED's or use some
> very low amperage LEDs or drive a Mosfet which drives a LED?
>
>
>
> The 0000 output on the KIO3 for 60M has me concerned. I want to make sure it
> doesn't cause me a problem when switching between 160-2M and between auto
> antenna selection and manual antenna selection.
>
>
>
> Tnx for any feedback.
>
>
>
> 73,
>
> N2TK, Tony
>
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