[CQ-Contest] Help for pull-up resistors

[Dave Hachadorian]

----- Original Message ----- 
From: "Dick Dievendorff" <dieven at comcast.net>
To: <PaulKB8N at aol.com>; <CQ-Contest at contesting.com>
Sent: Wednesday, March 05, 2008 5:16 AM
Subject: Re: [CQ-Contest] Help for pull-up resistors


> 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

---------------------------
After looking at the K3 interface chip, W9XT told me that 
pullup to 12V would be fine.

Dave Hachadorian, K6LL
Yuma, AZ




















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