I was on 40meter CW last week using my Boat Anchors (DX-60 & SB-303). Called CQ and KK4RF, Marty in Suffolk, VA, replied back. When we exchanged info on our rigs, discovered that he was also running a DX-60 and we enjoyed a very pleasant qso. (QSO video here). During that QSO, Marty told me about this homebrew QSK switch that he had built and was using. It provided full QSK break in as well as receiver grounding and optionally, muting of the receiver on transmit keystrokes. The circuit was designed by Phil, AD5X, who is a prolific designer and QST article author.
I found this QSK switch interesting as I was not happy with my current setup of manually switching my xmtr & rcvr with my DowKey relay. Since Marty had mentioned how well the unit worked, I decided to take a look at the circuit and construction layout to see if I was going to attempt construction. The article appears in the Feb 2012 issue of QST and is also on Phil’s website (AD5X QSK article). I found the circuit and hardware to not be all that difficult so I decided to go ahead and build it.
As is visible, there is a complete parts list with Mouser part numbers if any parts are needed. I had most of the resistors, caps and all of the diodes but I needed to order most of the hardware, the Omron high speed relays and one of the transistors (the PNP).
The parts arrived relatively quickly and I decided to start immediately. After scribing the positions for the hardware I set to drill things out on my drill press.
Pretty easy work and was able to borrow the larger drill bits from my buddy Mick, W8MLS.
I had a small Radio Shack PCB that I utilized and went ahead to determine parts layout. This was the most difficult portion of the project.
After setting up I soldered the circuit, installed the relays into the 16 pin sockets and tested functionality.
I tested the completed project and then installed it at my Boat Anchor position. The project worked flawlessly (QSK video here) and I now have updated QSK capability for these old radios. Thanks to Marty (KK4RF )for bringing it to my attention and Phil (AD5X) for his circuit design.