Like the CW modem, the hardware for the project controller includes a few It also decodes the audio signals from the radio and converts these into In the terminal into outgoing data in the chosen mode, to modulate the radio. The modem converts the characters being typed The main idea for both projects is to provide a modem that can be used withĪ simple terminal program. This mode turned out to be even simpler to implement on anĪrduino than CW, and the project gets me one step closer to my goal of havingĪn open-source, multimode digital interface for HF that can be run completelyįrom battery, and does not require a PC with a soundcard. Project, so I thought I would try another digital mode - this time, This approach worked quite well for the CW modem Squeeze out of a microcontroller such as the Atmel AVR, upon which the Arduino Have successfully used small low-power computers for modes such as BPSK31 andĬW, so I have been working to see how much digital mode functionality I can Where a simple text-to-mode interface would be more than sufficient. Is indeed impressive, it is a bit over the top for casual or portable operating, While the DSP capabilities of these packages Unfortunately, the modern sound-card-mode software requires ever-increasingĬPU power to run accepably. Receiver, without one more watt of power consumed! That would give me nearly three S-units of improvement at the other guy's Much rather run the computer and interfaces 'on QRP,' and then haveĤ00W of input to my transmitter, giving me a 200W signal on the air. I see no reason to run 5W or less from the transmitter, when the PC used forĭigital modes or logging burns 400W or more, even when idling. Power I have into the transmitter, or into the longevity of operation.

If I ever found myself operating with a power budget, I would rather put the Their idea of optimizing the power budget of a radio station. Patient enough to do QRP at the moment, but I am taking some inspiration from The guys who fly gliders, the QRP community continues to master the art ofĭoing more with less, and I admire their accomplishments.

To be honest, I think the idea of HF QRP is very interesting. Version 2.0 modem, based on the Teensy, see the Version 2.0 RTTY Modem Matt Roberts - matt-at-kk5jy-dot-net Published: Updated: This article is for the original version, based on the Arduino Uno.

Rtty decoders