K1EL Systems LLC
K45B CW Modem w/USB Keyboard I/F
Revision B

$239.00 Assembled & Tested



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K45B CW Modem $239
K45 Accessory Cable Kit $8
K45B Documentation
K45B User Manual rev B
K45B Product Brief
K45 Cable & Splitter Information

CH341SER.exe USB Driver (2023 version)
Windows CH340 Driver (.zip file) (2023 version)

K45 Revision A Webpage  (previous version)


Revision B is equivalent to revision A with the exception that we no longer use FTDI parts in our keyers. K45 Rev B uses the CH340.  Please refer to the K45 Rev B Manual for more informationA Mini USB Cable is included
USPS Priority Mail shipping is $11.50

Attention: Due to EU & UK customs and tax regulations, we are not able to sell directly to EU or UK at this time.

K45 Display Windows Application
K45 Firmware Update


The K45 is the Swiss Army knife of CW keyers. A CW keyboard interface, CW reader, iambic paddle keyer, backlit LCD display, and optically isolated keying outputs are all presented in one compact box. In addition, the K45 will operate many different modes including RTTY transmit, QRSS, HSCW, and conventional CW up to 99 WPM. We sell the K45 assembled, tested, and ready to go. It is powered over a USB cable connection to a PC, charger, or battery. Please review the cable recommendations link for K45 cabling info. We do not include a keyboard with the K45, almost any USB keyboard, wired or wireless, will work fine. Exception: Logitech wireless keyboards with Unified Interface.

The on board CW reader accepts audio from a receiver, then filters, demodulates, and decodes CW characters which are then displayed on the LCD. An bar graph is used to tune in CW stations quickly and accurately. The K45 CWR is a new design featuring much improved copy and faster reader lock than the original K42 CWR.

K45C Features

CW Reader Specifications





K45 Audio Splitter $19

K45B Out of Stock till middle of January 2024