[CQ-Contest] Help for pull-up resistors

[Dick Dievendorff]

Maybe it should be pulled up to +5V, I'm not sure it matters that much.
The W9XT BCD-10 schematic shows logic levels of 0 and 5V.  The Elecraft K3
Owner's manual (on the Elecraft web site) says that the maximum voltage is
24V and that the K3 wants the lines pulled up to the W9XT's supply voltage.
The W9XT BCD-10 uses a 4N32 opto isolator, and that shouldn't be very
critical.

Dick, K6KR


-----Original Message-----
From: cq-contest-bounces at contesting.com
[mailto:cq-contest-bounces at contesting.com] On Behalf Of Dick Dievendorff
Sent: Tuesday, March 04, 2008 7:50 PM
To: PaulKB8N at aol.com; CQ-Contest at contesting.com
Subject: Re: [CQ-Contest] Help for pull-up resistors

One end of each of four resistors goes to the four band data lines (output
from the K3 DE-15 accessory jack, input to the W9XT card). The other end of
each of the resistors goes to +12V.  They "pull" the data lines "up" to 12V.

I'd suggest something in the neighborhood of 10K ohms.

I am not a hardware engineer, nor do I play one on TV...

73 de Dick, K6KR


-----Original Message-----
From: cq-contest-bounces at contesting.com
[mailto:cq-contest-bounces at contesting.com] On Behalf Of PaulKB8N at aol.com
Sent: Tuesday, March 04, 2008 11:40 AM
To: CQ-Contest at contesting.com
Subject: [CQ-Contest] Help for pull-up resistors

Sorry, this is a bit off topic, but I can't find anything in the K-3  
archives on this.
 
I've have a new K3 coming in tomorrow and want to do antenna switching via  
the band-data outputs.
 
I've purchased the W9XT band decoders but cannot ascertain how to wire the  
"pull up resistors" to the W9XT card inputs.  How are they wired, in
series?  
What kind of voltage is applied and where?  What resistor  value is 
recommended?
 
Anyone who can help out there?  Sorry for the bandwidth, guys!   Just want
to 
get everything up and running as soon as possible.
 
Thanks,  
 
Paul, K5AF



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