[Elecraft] Warning: Windows 10 Update resets FTDI options back to defaults, keys radio

[Bob Wilson, N6TV]

I just installed a Windows 10 Update, and even before rebooting to complete
the install, I noticed that Windows had reset all my Elecraft FTDI virtual
COM port settings back to the (bad) FTDI defaults, which means your PC can
key your radio about 7 or 8 times every time Windows restarts  or the USB
cable is connected, assuming *CONFIG:PTT-KEY* is set to *RTS-DTR* in a K3,
or *MENU:Serial, USB-PC1* or* USB-PC2 DTR/RTS* is set to *CW* or *PTT* in a
K4, to support computer-generated CW and PTT.

To prevent this unwanted radio keying by Windows, while still being able to
use computer-generated CW and PTT on these COM port pins, do this for every
FTDI port:

   1. Open Windows Device Manager
   2. Expand *Ports* section
   3. Right click on Elecraft virtual COM port(s)
   4. *Properties*
   5. *Port Settings* tab
   6. *Advanced* Button
   7. Make sure *Serial Enumerator* is NOT checked
   8. Make sure *Disable Modem Ctrl At Startup* *is checked*
   9. Click *OK*

More details with screenshots in this updated presentation linked from my
QRZ.COM page <https://www.qrz.com/db/n6tv>:

   - Everything You Need to Know About USB and Serial Interfaces
   <https://bit.ly/USBserial2021>, updated for 2021

See slides 26, 27, and 28.

I've just updated this presentation (today) with a few new slides showing
on how to avoid the same unwanted keying issue when using legacy serial
ports like COM1: and COM2: (slides 29 to 33), and one new K4 Menu
screenshot (slide 52).

73,
Bob, N6TV