Elecraft K1 Display DIY LED Backlight

Well, I have a thing for K1’s and have built several over the years. For me, it’s everything a QRP rig should be.

I sold my last one that was totally tricked out with everything you could possibly put on a K1 including the spot filter LED, ATU, Noise blanker and Elecraft backlight kit.

Well that was a stupid move which I regretted. A friend of a friend had one on the shelf that he wanted to get rid of but it was totally stock with NO added features. I set out to bring it up to snuff.

My first task was to make a display backlight because the display is very hard to read without some direct light on it. Since there are no more backlight kits available from Elecraft I went looking for some ideas. I found some posts on the Elecraft reflector about using LEDs on either side of the display. That seemed like a good idea so I ordered some green LEDs. Since LEDs come in different voltages, I got some small LEDs rated at 3V. Using 2 on each side of the display wired in series, it enabled me to tap into the 12V supply on the display board without using any resistors to modify the voltage.

I used some stiff white paper and cut a couple of strips on either side of the display allowing for a couple of cutouts for a capacitor and resistor on the board and laid the paper down with a couple of very small dots of 3M blue tak (if you never heard of it, get some…it’s very handy stuff). I mapped out the positions of the leds making sure I got the sequence of the leads correctly; Cathode(-) to Anode (+) to Cathode to Anode and so on until the last LED lead was + which connected to the ground of the board on the left.

I finished it off with an 8mm strip of velcro material which was still enough to hold its shape and yet allow me to snake it around the components. I used the blue tak to keep it in place. This helps with light spill from the LEDs. It’s not perfect and there still is some minor light spill but for me it’s perfectly acceptable.

Here’s a picture of the final layout. The 12V is coming from pin 16 of the IC at the bottom right of the board to the ground (red wire top left).

Here’s a picture of what it looks like from the front panel with power on. There’s still a slight amount of spillover to the RIT/XIT LED but when RIT of XIT is activated the spillover is completely overridden. I decided to live with that instead of further attempts too completely eliminate spillover. A simple solution would be a length of heatshrink from the base of that LED to the underside of the front panel.

LED Backlight DIY

Compendium of Automatic Morse..new book by N3CW

https://www.amazon.com/Compendium-Automatic-Morse-Code-Goss/dp/0764351311/ref=sr_1_1?ie=UTF8&qid=1493586921&sr=8-1&keywords=automatic+morse

Check out page 150 and you’ll see a full page devoted to the Torsion Bar single lever key made by yours truly!

Trace the evolution of automatic Morse code devices from the early 1800s to today through this informative text and over 1,100 photos. Beginning with an overview of telegraphy and early key history, fifteen sections explore the equipment used to send messages over long distances. Featured are code readers, oscillators, Morse trainers, electronic keyers, single- and dual-lever paddles, portable paddles, automatic mechanical keys, accessories, and more. Each device is presented in text and images, some with classic advertisements; this combination allows the reader to appreciate device development and better understand the thinking that went into the design. Paddle and key maintenance and adjustment are also examined, as well as computer interfacing and use of the Internet. The book also includes the results of patent studies and historical research, with many new findings presented, making it a must-have for collectors, ham operators, or anyone interested in the history of these communication devices.

Ed Goss has been a licensed amateur radio operator (N3CW) for almost 50 years. He operates almost exclusively using Morse code, and collects unique telegraphy devices. Ed is a retired engineer and lives in Palm Coast, Florida.

 

1st International Field Day May 28th

I’ll be on the air from my cabin here in Vermont. Hope to CU there!!!

http://www.fieldradio.org/international-field-radio-event

The Field Radio group will be holding its inaugural International Field Radio Event in late May, 2016. Please note this is an activity and not a contest! Here is your opportunity to interact with fellow group members on air, so please support us in this fun activity.

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