On 11/29/2023 7:47 AM, Andy Durbin wrote:
The MAX3232 terminates the input with 5k which is almost identical to the
KAT500 transmitter source impedance.
The impedance that must be matched to preserve waveshape is that of the
transmission line. The RS232 protocol does not do that. Most other
"Scope traces for a typical KAT500 serial data interface can be found here -
https://www.dropbox.com/scl/fi/ypk0ks16rl03d55ugm4t9/KAT500-signal-levels.pdf?rlkey=7iahis4xp0jnua3c8s577cxjq&dl=0";
The depicted voltage levels for KAT500 driving the KXUSB were not typical. In
my station the KAT
Andy’s point that the KXUSB actually has 0 to 5V output on its TxD line is
correct. This is most likely the limiter in how long of a cable you can have
between the KXUSB and the KAT500.
The actual length is probably best derived by trial and error. As K9YC points
out, the rise and fall times of
On 11/28/2023 6:46 AM, Andy Durbin wrote:
Isn't it true that the KAT500 USB cable uses RS-232 protocol but TTL signal
levels? T
RS-232 is NOT a matched transmission line -- it's a low-Z source and
high-Z input. The limitation on line length is not signal strength, but
rounding of the pulses
Scope traces for a typical KAT500 serial data interface can be found here -
https://www.dropbox.com/scl/fi/ypk0ks16rl03d55ugm4t9/KAT500-signal-levels.pdf?rlkey=7iahis4xp0jnua3c8s577cxjq&dl=0
I can also confirm that KAT500 works just fine when interfaced with a genuine
MAX 3232 RS-232 line driver
ilman.qth.net On
Behalf Of Jack Brindle via Elecraft
Sent: Tuesday, November 28, 2023 11:48 AM
To: Andy Durbin
Cc: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] USB/3.5mm Extension?
So that everyone reading understands, the KAT500 IS RS-232/IEEE-232 compatible
in its voltage levels. It is
So that everyone reading understands, the KAT500 IS RS-232/IEEE-232 compatible
in its voltage levels. It is NOT TTL (0,5v) compatible.
73, Jack, W6FB
Sent from my iPhone
> On Nov 28, 2023, at 10:14 AM, Andy Durbin wrote:
>
>
> "Indeed, it is NOT true that the KAT500 uses TTL signal levels
"Indeed, it is NOT true that the KAT500 uses TTL signal levels for the serial
port. "
Ah, but I said "Isn't it true that the KAT500 USB cable uses RS-232 protocol
but TTL signal levels? " Perhaps I should have been more specific. My
recollection is that the USB/Serial cable transmits a TTL s
Andy, you do a great job of keeping me on my toes. But...
Indeed, it is NOT true that the KAT500 uses TTL signal levels for the serial
port. The KAT500 has voltage translation circuitry that allows for the use of
quasi-RS232 signal levels.
Quasi? Yes, the transmit data goes to +12 Volts, but it
"Yes. At the point for the extension, the signals are RS-232, not USB. You
should be able to use a much longer cable if need-be."
Isn't it true that the KAT500 USB cable uses RS-232 protocol but TTL signal
levels? TTL may not be as tolerant of length extension as true RS-232.
Certainly no pr
Yes. At the point for the extension, the signals are RS-232, not USB. You
should be able to use a much longer cable if need-be. Be sure to read through
the manual - it should give you a much better feel for each connection.
Enjoy the KAT500!
73,
Jack, W6FB
> On Nov 25, 2023, at 2:59 PM, W2HX
Hi all,
I have acquired my KAT500 and I am starting to play with it. I am trying to use
the KAT utility to control it which it does fine. Now I want to place it
between a transmitter and cable. Can I use a 10 foot 3.5mm TRS male to female
extension cable to extend the USB connector? My computer
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