[Elecraft] USB/3.5mm Extension?

[W2HX]

Well.... to be pedantic the RS-232 (EIA-232) spec says the following:

" Valid signals are either in the range of +3 to +15 volts or the range −3 to −15 volts with respect to the "Common Ground" (GND) pin; consequently, the range between −3 and +3 volts is not a valid RS-232 level."

So the spacing signal should not be ground if you want to adhere strictly to the standard. Having said that, I'm sure it all works very well!

73 Eugene W2HX
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-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Jack Brindle via Elecraft
Sent: Tuesday, November 28, 2023 11:48 AM
To: Andy Durbin <a.durbin at msn.com>
Cc: Elecraft at 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 NOT TTL (0,5v) compatible.

73, Jack, W6FB


Sent from my iPhone

> On Nov 28, 2023, at 10:14 AM, Andy Durbin <a.durbin at msn.com> wrote:
> 
> 
> "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 signal.  I have no way to know the receiver characteristics of that interface dongle.  I did study the KAT500 I/O schematic to understand that end of the connection.
> 
> Anyway, not posting to "keep you on your toes".  I was confused by this interface when I first decided to work with it so didn't want people to assume it was RS-232 compliant.
> 
> 73,
> Andy, k3wyc
> 
> 
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