K2 USB interface

This page is work in progress and will be updated frequently. 

wip_c2

End July 2022  I got my hands on a used Elecarft K2 with a few options : 

  • KAF-2 - Audio filter and realtime clock
  • KAT-2 - Internal antenna tuner (with 2 antenna inputs)
  • KNB-2 - Noise blanker
  • KSB-2 - SSB unit
  • DIY PTT output

And although it needed some work (for example : the 20m band needs alignment, undocumented MODS), I'm quite happy with this QRP rig.

Because the  Elecraft K2 is a modular transceiver, it has even more room to add even more modules like :

  • KIO-2 - RS-232C interface and AUX I/O
  • K160M 160M and 2nd RX Port
  • K60XV - 60m + Transverter Adapter Kit 
  • KBT2 Battery

All these options lave a lot of large holes in the back. And one which got my eye was the AUX IO place for the KIO-2.

k2_usb_02

Because I work a lot with embedded devices I have a large stack of FTDI USB to TTL Serial ports laying around.

k2_usb_01

3D designed a holder for this adapter which fits in to AUX-IO hole.

k2_usb_03

The assembly exists of 2 parts : 1 to expose the PCB to the outer world (left), and 1 to fixate the PCB (right)

k2_usb_04

The adapter PCB is placed into the first part.

k2_usb_05

And it's fixated by placing the second part. 

k2_usb_06

And it looks good as I may say so. 

k2_usb_07

It even fits perfect, except for the long screws (I went into town and bought a bag of M3x16 RVS).

k2_usb_08

k2_usb_09

And once installed I decided that I need a re-design of the lock part. Now it has room to insert the M3 nuts. 

k2_usb_15

 

Adapter assembly.

TODO : add drawing

I used a shielded cable for the RFI.

 

k2_usb_12

k2_usb_13

Control board connection. 

  • White Control board TX - FTDI RX
  • Red Control bard RX - FTDI TX
  • Black Control board GND - FTDI GND / CTS

k2_usb_16

put everything into place

k2_usb_14

Testing

TODO add picture of minicom configuration

k2_usb_11

k2_usb_10