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

[Wes Stewart]

Why don't you just trust the decoder?

--- On Sun, 1/27/13, N2TK, Tony <tony.kaz at verizon.net> wrote:

From: N2TK, Tony <tony.kaz at verizon.net>
Subject: [Elecraft] K3 - ACC Connector - Band0-3 output indicator
To: "'elecraft'" <elecraft at mailman.qth.net>
Date: Sunday, January 27, 2013, 4:29 PM

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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