[Elecraft] [WriteLog] Using K3 KIO3B USB with Writelog

[Joe Subich, W4TV]

> But if you plug it into a DIFFERENT USB port, Windows will think it's
> a new device, and assign ANOTHER COM port to it.

That's true only in so far as the USB device does not have a unique
serial number.  The USB device descriptor in the EEPROM has a place
for a serial number but many manufacturers do not make use of it.
If the device is "numbered", it can be moved from port to port and
the virtual COM number will not change.  Unfortunately, many hardware
manufacturers do not take the time to provide/program a hardware serial
number before shipping their products - they rely on the chip maker's
default device descriptor and drivers.

73,

   ... Joe, W4TV


On 12/25/2015 11:56 AM, Jim Brown wrote:
> On Fri,12/25/2015 6:39 AM, Ed Muns wrote:
>> No splitters or isolation transformers are needed.  That is the whole
>> point
>> of the KIO3B.
>
> WRONG! The need for isolation transformers is a total fallacy. No
> isolation transformers are needed with ANY radio if proper, simple
> chassis-to-chassis bonding of all interconnected equipment is done in
> the shack. It's easy and cheap -- all it takes is short lengths of
> plain, ordinary copper wire.
>
> Study http://k9yc.com/GroundingAndAudio.pdf
>
> The tutorial is a bit long because I have to bust the "ground loop" myths.
>
> Otherwise, nothing wrong with Ed's detailed advice. EXCEPT -- Windows
> defines a COM port when you plug in a device that is new to it. It
> remembers that assignment as long as you plug the same device into the
> SAME USB PORT on the computer. But if you plug it into a DIFFERENT USB
> port, Windows will think it's a new device, and assign ANOTHER COM port
> to it. SO -- be careful to keep notes of which devices (rigs, mice,
> etc.) are plugged into which USB ports. It's real easy to end up with a
> mess if you don't!  Ask me how I know. :)
>
> 73, Jim K9YC
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to lists at subich.com
>