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

[N2TK, Tony]

Finally got to make up an LED tester for both the Band0-3 and Digout1.
Everything looks fine. No problems selecting two antennas on all bands
160-6M.  I have the built in 2M transverter. On 2M I get 0000, the same as
on 60M. But 2M selects Ant3. So I don't think there will be any problems.
Next phase later this week when I hook up the BCD-14 board.
73,
N2TK, Tony
 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Joe Subich, W4TV
Sent: Sunday, January 27, 2013 7:37 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 - ACC Connector - Band0-3 output indicator


> 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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