The program can decode fraction-of-a-second signals reflected from ionized meteor trails and steady signals 10 dB below the audible threshold.ġ0 The WSJT program facilitates basic digital communication using protocols explicitly optimized for a number of different propagation modes. It is useful for testing the JT65 decoder and the relative capabilities of these two modes.ĩ The WSJT program ("Weak Signal Communication, by K1JT") offers specific digital protocols optimized for meteor scatter, ionospheric scatter, and EME (moon bounce) at VHF/UHF, as well as HF skywave propagation. Stations with internet access can automatically upload their reception reports to a central database called WSPRnet, which includes a mapping facility.Ĩ The SimJT program generates JT65 and CW test signals with a user-specified signal-to-noise ratio. The program can decode signals with S/N as low as -28 dB in a 2500 Hz bandwidth. Normal transmissions carry a station's callsign, Maidenhead grid locator, and transmitter power in dBm. Version 2.11 of WSPR includes FMT, a package of command-line utilities that can help you make highly accurate frequency measurements without expensive laboratory equipment.ħ The WSPR program implements a protocol designed for probing potential propagation paths with low-power transmissions. Users with internet access can watch results in real time at WSPRnet. This program is designed for sending and receiving low-power transmissions to test propagation paths on the MF and HF bands.
![jt65-hf jt65-hf](https://www.dxzone.com/dx31273/jt65-8208-hf-operation-guide.jpg)
It has all features of MAP65 except the polarization matching capability, and it supports the JT65A, B, and C sub-modes.Ħ The WSPR program (pronounced "whisper") stands for "Weak Signal Propagation Reporter." Its principal application is EME on the VHF and UHF bands.ĥ The MAP65-IQ program is a single-polarization version designed to work with the SDR-14, SDR-IQ, Perseus and other SDR receivers. It works together with Linrad (by SM5BSZ) and dual-polarization RF hardware to receive and decode all detectable JT65 signals in a 90 kHz passband, matching the linear polarization angle of each one and producing a band map of decoded callsigns sorted by frequency.
![jt65-hf jt65-hf](https://www.iv3pgq.it/wp-content/uploads/2014/05/JT65-HF.jpg)
All you need to use these programs is a SSB transceiver, personal computer with a sound card and an interface between the two.Ĥ The MAP65 program implements a wideband, polarization-matching receiver for JT65 signals. Installation files for Linux are available for WSJT and WSPR.
Jt65 hf free#
All four of these ready-to-run Windows programs are free and can be down loaded at /pulsar/K1JT/index.html. The programs are WSJT, MAP65, WSPR and SimJT. Preparation for running WSJT-X on OS X does require a bit of command line usage, but it is fully-explained, simple and only has to be done during the initial installation.3 BACKGROUND Joe Taylor, K1JT, developed a suite of open-source programs designed for weak-signal digital communication by amateur radio. Currently at v1.3 r3673, the OS X version is assembled by John Nelson (G4KLA) and is available for OS X 10.6 – 10.9. The best thing to come out of the development of WSJT-X, at least for OS X users, is the release of a native OS X application for the software. Some of these were versions of JT65-HF wrapped in WINE for use on OS X while others compiled WSJT from source to run on OS X. WSJT-X supports both the JT65 and JT9 modes and incorporates many of the enhancements originally developed by Joe Large for JT65-HF including multi-decode and simultaneous decode of both JT65 and JT9 modes with seamless transition between the two.Īlthough the JT65 revolution started on Linux and Windows, there have been attempts to migrate it to OS X as well. In order to support this new mode as well as a move to a new development environment, Joe Taylor released a new version of WSJT known as WSJT-X. JT9 is a superior mode for HF operation, being about 2dB more sensitive while operating in approximately 10% of the spectrum space utilized by JT65. Having attracted a large base of users around the world, JT65-HF added many great features such as multi-decode and a simplified interface that made JT65 more accessible for many.Ĭontinuously experimenting with weak-signal modes, Joe Taylor continued his development of new modes with an eye on improving both signal sensitivity and spectral efficiency, resulting in the release of the new mode JT9. Thanks largely to the efforts of Joe Large (W6CQZ) and his hugely popular Windows JT65-HF software, JT65 operation was simplified and is now widely used for routine terrestrial contacts on HF.
Jt65 hf software#
Developed by Nobel Laureate Joe Taylor (K1JT), JT65 is a weak-signal mode originally designed for EME operation and included in the WSJT software program for Linux and Windows. As many of you know, over the last few years JT65 has become one of the most popular digital modes on HF.