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TAPR and the HPSDR group are working together to bring an open SDR platform to Amateur Radio.

20M WSPR Pi Module

This little board makes a 20 meter QRP transmitter out of a Raspberry Pi credit card size computer. There are apps for the transmission of WSPR, PiCW, SSTV and FREQ_PI.

TADD-2 Mini (T2-Mini) The TADD-2 Mini (or "T2-Mini") is a tiny frequency divider board that accepts a 1, 2.5, 5 or 10 MHz input signal and generates a 1 pulse-per-second ("PPS") output pulse. The pulse can be synchronized to an external source (such as a GPS receiver). The divider is implemented in a DIP-socketed PIC chip using software written by Tom Van Baak. ... Read more

TICC Timestamping/Time Interval Counter The TAPR TICC is a two-channel timestamping counter with better than 60 picosecond resolution and less than 100 picosecond typical jitter. It has an Allan Deviation noise floor below 1x10-10 for a one second measurement.

The TICC designed to measure low-rate time intervals, such as the pulse-per-second signal from a clock or GPS, with very high resolution. The TICC hardware is a "shield" that mounts on an Arduino Mega 2560 processor board, and the TICC software runs on the Arduino. Data is sent via USB to a host computer for logging and analysis. The TICC can currently perform over 100 measurements per second; we believe that software optimization will ultimately increase the measurement speed. ... Read more

TNS-BUF Kit The TNS-BUF Isolation Amplifier is a very low noise, high isolation, buffer amplifier for use in time and frequency measurement applications where it is important to isolate signals without adding noise. The main purpose of the TNS-BUF is to look as much as possible like a one-way piece of wire at RF frequencies.

It is designed for use at 5 or 10 MHz, but will work with some loss of gain from 1 MHz to at least 50 MHz. ... Read more

Atlas Backplane The Atlas back plane is the foundation for the HPSDR radio system. Read more

Compact Flash Adapter An updated interface board has been developed which allows CompactFlash cards (Type I & II) or a IBM Microdrive?.? to be used as a boot devices on a PC. It takes advantage of the "true IDE" mode of a CompactFlash?.? Card that allows it to operate as a true IDE hard disk drive. The original CompactFlash Adapter (Type I) was developed in 1997 to fill a need for a rugged boot disk, that networkers could use to run NOS or some other network node software... Read more

DTMF Accessory Squelch The DAS (DTMF Accessory Squelch) acts like a switch connected in series between the speaker output of your VHF or UHF transceiver and an external speaker. DAS will monitor a radio channel for you, with the speaker switch open so the speaker remains silent, until someone sends one of the DTMF sequences you have selected. When DAS hears your personal Touch-Tone ID sequence on the radio channel it will light a LED, sound an buzzer and close the series speaker switch so that you can hear the audio of the calling station... Read more

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