Re: [Elecraft] K3S with more than one device on the Band Data signals

2017-03-10 Thread Ionut Pitu via Elecraft 
You could use a line buffer.Check this page 
http://www.kotarov.com/projects/k3-and-acom-2s1This is an adapter for acom 2S1 
switch, but he also added a buffer  to drive more then one decoder, just use 
that part :-)BobYO8RNI

  From: NOEL POULIN <ve2...@globetrotter.net>
 To: Elecraft@mailman.qth.net 
 Sent: Saturday, March 11, 2017 12:38 AM
 Subject: [Elecraft] K3S with more than one device on the Band Data signals
   
Hi to all,
I am on the way to connect a Bandpasser2 (band data mode) on a K3s.
Later I would like also to connect a band decoder on the same radio to 
switch coaxial stubs.
I wonder if the K3s can handle more than one device connected to the 
Band Data signals.
I suppose that Elecraft band output is probably designed to drive one 
decoder and this decoder is designed with current maximums for each port.
I would appreciate comments and good tips about that fact...
Thanks
Noel
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Re: [Elecraft] K3S with more than one device on the Band Data signals

2017-03-10 Thread brian 
Back a bit, I had the need to drive a remote switch and something else 
with the BCD band data.


For me there was simple PIC based solution.  BCD input to PIC.  PIC 
programmed to switch to appropriate antennas .  Input BCD data echoed to 
other PIC outputs.  PIC outputs buffered by a ULN2003's or 2n's.


73 de Brian/K3KO

On 3/11/2017 1:47 AM, Jack Brindle wrote:

As I recall, it is a standard LS TTL style open-drain driver, which means it 
has a fan out of about 10 LS loads. You should be able to connect several 
devices. Be sure they do not have pull-ups that are connected to higher that 5 
volts (some band decoders have pull-ups to 12V). The K3 has internal pull-ups 
to 5V, so having 12V on these lines will subject the K3 to 12V. The internal 
pull-ups will limit the current, but if the K3 is off when the decoder is on, 
you could get damage or even false powering of some of the K3 internal 
components.

False powering means that the component is actually powered through an IO port 
instead of its main supply line. This is a very bad situation that can damage 
the part since it is powered incorrectly. It is also maddening to debug since 
the part (possibly a processor) seems to be working when it should not be and 
can actually do some very strange things.

73!

Jack, W6FB



On Mar 10, 2017, at 2:38 PM, NOEL POULIN  wrote:

Hi to all,
I am on the way to connect a Bandpasser2 (band data mode) on a K3s.
Later I would like also to connect a band decoder on the same radio to switch 
coaxial stubs.
I wonder if the K3s can handle more than one device connected to the Band Data 
signals.
I suppose that Elecraft band output is probably designed to drive one decoder 
and this decoder is designed with current maximums for each port.
I would appreciate comments and good tips about that fact...
Thanks
Noel
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Re: [Elecraft] K3S with more than one device on the Band Data signals

2017-03-10 Thread Jack Brindle 
As I recall, it is a standard LS TTL style open-drain driver, which means it 
has a fan out of about 10 LS loads. You should be able to connect several 
devices. Be sure they do not have pull-ups that are connected to higher that 5 
volts (some band decoders have pull-ups to 12V). The K3 has internal pull-ups 
to 5V, so having 12V on these lines will subject the K3 to 12V. The internal 
pull-ups will limit the current, but if the K3 is off when the decoder is on, 
you could get damage or even false powering of some of the K3 internal 
components.

False powering means that the component is actually powered through an IO port 
instead of its main supply line. This is a very bad situation that can damage 
the part since it is powered incorrectly. It is also maddening to debug since 
the part (possibly a processor) seems to be working when it should not be and 
can actually do some very strange things.

73!

Jack, W6FB


> On Mar 10, 2017, at 2:38 PM, NOEL POULIN  wrote:
> 
> Hi to all,
> I am on the way to connect a Bandpasser2 (band data mode) on a K3s.
> Later I would like also to connect a band decoder on the same radio to switch 
> coaxial stubs.
> I wonder if the K3s can handle more than one device connected to the Band 
> Data signals.
> I suppose that Elecraft band output is probably designed to drive one decoder 
> and this decoder is designed with current maximums for each port.
> I would appreciate comments and good tips about that fact...
> Thanks
> Noel
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
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> This list hosted by: http://www.qsl.net
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> Message delivered to jackbrin...@me.com

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Re: [Elecraft] K3S with more than one device on the Band Data signals

2017-03-10 Thread Bob Wilson, N6TV 
Using band data mode, I've simultaneously driven both the KPA500 and a Top
Ten Devices band decoder from a single K3 with no problems.

73,
Bob, N6TV

On Fri, Mar 10, 2017 at 2:38 PM, NOEL POULIN 
wrote:

> Hi to all,
> I am on the way to connect a Bandpasser2 (band data mode) on a K3s.
> Later I would like also to connect a band decoder on the same radio to
> switch coaxial stubs.
> I wonder if the K3s can handle more than one device connected to the Band
> Data signals.
> I suppose that Elecraft band output is probably designed to drive one
> decoder and this decoder is designed with current maximums for each port.
> I would appreciate comments and good tips about that fact...
> Thanks
> Noel
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
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> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to n...@arrl.net
>
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Re: [Elecraft] K3S with more than one device on the Band Data signals

2017-03-10 Thread Jim Brown 

On Fri,3/10/2017 2:38 PM, NOEL POULIN wrote:
I wonder if the K3s can handle more than one device connected to the 
Band Data signals. 


My guess is that the answer is yes. I would expect the decoder you're 
driving to have a high-Z input. Also, study the manual for that unit. 
It's part of a system, and may have band data output. Lots can be 
learned from studying manuals.


73, Jim K9YC

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[Elecraft] K3S with more than one device on the Band Data signals

2017-03-10 Thread NOEL POULIN 

Hi to all,
I am on the way to connect a Bandpasser2 (band data mode) on a K3s.
Later I would like also to connect a band decoder on the same radio to 
switch coaxial stubs.
I wonder if the K3s can handle more than one device connected to the 
Band Data signals.
I suppose that Elecraft band output is probably designed to drive one 
decoder and this decoder is designed with current maximums for each port.

I would appreciate comments and good tips about that fact...
Thanks
Noel
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