Greetings, all you I/O experts out there -- I need some advice, please
I'm using K2 #2634 with a KPA100 and KAT100; therefore the RS232 I/O is done
by the MAX1406 chip on the KPA100. I've done computer control in the past but
not for some months, so today I was rather surprised when I
The high voltage bias supply on the KIO2 is between -6v to -12, so
your 19.4 is probably sufficient, but the KIO2 Vss, U4 pin 8 is -9v on
my KIO2. The MAX1406 wants from -13.2 to -10.8, but the absolute max
ratings are from +0.3 to -14.0, so you're probably OK with the -5.87.
The real suspect is
Frank,
Can you make a comparison of the voltage on U4 pin 8 with what you had at
some time previous. All other voltages except that one seem in order with
no computer connected. The only pins used on the chip are 1, 5, 6, 8, 11,
12, and 16. Pins 9 10 and 14 are grounded, but the rest are
On Jun 25, 2005, at 5:02 PM, Matt Osborn wrote:
The high voltage bias supply on the KIO2 is between -6v to -12, so
your 19.4 is probably sufficient, but the KIO2 Vss, U4 pin 8 is -9v on
my KIO2. The MAX1406 wants from -13.2 to -10.8, but the absolute max
ratings are from +0.3 to -14.0, so
On second look...
On Jun 25, 2005, at 1:06 PM, Frank Van Cleef W1WCG wrote:
After verifying continuity between the computer end of the RS232
cable and the RF chokes on the KPA100 board (RFC6, RFC7) I meaured
voltages on the MAX1406 chip. Except for the 5 and 12v supply
voltages they were
- Original Message -
From: Matt Osborn [EMAIL PROTECTED]
To: Frank Van Cleef W1WCG [EMAIL PROTECTED]
Sent: Saturday, June 25, 2005 5:46 PM
Subject: Re: [Elecraft] RS232 problems with KPA100
The high voltage bias supply on the KIO2 is between -6v to -12, so
your 19.4 is probably
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