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K3 - ACC Connector - Band0-3 output indicator

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N2TK

K3 - ACC Connector - Band0-3 output indicator

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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n7ws

Re: K3 - ACC Connector - Band0-3 output indicator

Why don't you just trust the decoder?

--- On Sun, 1/27/13, N2TK, Tony <[hidden email]> wrote:

From: N2TK, Tony <[hidden email]>
Subject: [Elecraft] K3 - ACC Connector - Band0-3 output indicator
To: "'elecraft'" <[hidden email]>
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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Don Wilhelm-4

Re: K3 - ACC Connector - Band0-3 output indicator

In reply to this post by N2TK

Tony,

I would suggest that you use a 74xx07 Hex Buffer between the K3 band
outputs and the LEDs to show you the state of the band outputs. If the
0000 state for 60 meters bothers you, use a 74xx06 which inverts the
output so all 4 LEDs will be on for 60 meters.

Like Wes, I think you should trust the K3 band outputs and your efforts
would be better placed in lighting LEDs from the output of your BCD-14
band decoder to give you confidence that the band decoder is working
properly.

Of course, you could that with your DMM without building anything extra.

73,
Don W3FPR

On 1/27/2013 6:29 PM, N2TK, Tony wrote:

Joe Subich, W4TV-4

Re: K3 - ACC Connector - Band0-3 output indicator

In reply to this post by N2TK

> 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:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

N2TK

Re: K3 - ACC Connector - Band0-3 output indicator

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: [hidden email]
[mailto:[hidden email]] On Behalf Of Joe Subich, W4TV
Sent: Sunday, January 27, 2013 7:37 PM
To: [hidden email]
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:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html
>

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N2TK

Re: K3 - ACC Connector - Band0-3 output indicator

In reply to this post by Joe Subich, W4TV-4

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: [hidden email]
[mailto:[hidden email]] On Behalf Of Joe Subich, W4TV
Sent: Sunday, January 27, 2013 7:37 PM
To: [hidden email]
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:

which drives a LED?