Tnx Joe, Don and Wes for feedback. I was leaning towards the 4 NPN's but first wanted to check in case I was missing something.
The reason I want to see the value of BAND0-3 is that I will be monitoring the output with LED's of two UM BCD-14's. While building this project I want to see if there are any cases where there might be a conflict. My project is to use BAND0-3 as input for automatic operation to one BCD-14 while I will use a binary encoder for manual operation as input to the other BCD-14. I will use a pair of hex buffers to switch between auto and manual antenna band selection. I will use another pair of hex buffers to select which bank of antenna outputs I want. The plan is to use DIGOUT1 (Front panel ANT1/ANT2) to select which bank. This gives me auto operation with two antennas per band, which is what I have for most bands. Hopefully this all makes sense. I have been procrastinating doing this project for a long time. Finally got my 80M 4-sq with elevated radials working well and now the ground is snow covered. So time for other projects. Couldn't find an off the shelf package that would do this. 73, N2TK, Tony -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV Sent: Sunday, January 27, 2013 7:37 PM To: elecraft@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 > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
