Category: Technical Topics
Technical Topics
Audio transformers 600:600 ohmsSmall, cheap and widely available (eBay) transformers are frequently used in digimode interfaces. Read more.
Audio transformers 600:600 ohms on eBaySmall, cheap and widely available chinese transformers are frequently used in digimode interfaces, however the documentation is very poor. Both primary and secondary consists of 800 turns of enameled 0.06 mm copper wire wound with double wire. It has DC resistance of 135 ohms +/- 20% and inductance of 290 mH +/- 20%, wound on
The TinyKeyerThe TinyKeyer
the (possibly) World's Smallest Fully-Featured CW Keyer with Computer Support
Introduction
This keyer, based on Arduino design, employs the famous K3NG code. It can be used with any Windows/Linux/Mac logging or contesting software with Winkeyer USB (K1EL) support. The credit & big kudos goes to Anthony Good (Goody), K3NG, who did the tremendous work. It is a very small unit (outer dimensions 45 x 45 x 18.6 mm, appx. 1.8 x 1.8 x 0.73 in) which does not have any fancy options (a zillion of buttons, psychedelic flashing LED lights or cockatoo colored displays). It is intended for regular CW work and contesting with computer support, most of functions should be adjusted and operated via the computer. For standalone work an acoustic menu in command mode is used. Otherwise, only speed control knob and a mini LED indicating the command mode is on the front panel, nothing more.
The TinyKeyer
the (possibly) World's Smallest Fully-Featured CW Keyer with Computer Support
Introduction
This keyer, based on Arduino design, employs the famous K3NG code. It can be used with any Windows/Linux/Mac logging or contesting software with Winkeyer USB (K1EL) support. The credit & big kudos goes to Anthony Good (Goody), K3NG, who did the tremendous work. It is a very small unit (outer dimensions 45 x 45 x 18.6 mm, appx. 1.8 x 1.8 x 0.73 in) which does not have any fancy options (a zillion of buttons, psychedelic flashing LED lights or cockatoo colored displays). It is intended for regular CW work and contesting with computer support, most of functions should be adjusted and operated via the computer. For standalone work an acoustic menu in command mode is used. Otherwise, only speed control knob and a mini LED indicating the command mode is on the front panel, nothing more.
