Some of you have noticed that JT65 has mysteriously vanished off the old download sites. There is a reason for this. Joe Taylor, K1JT has a new digital mode for the low bands that works in a similar manner called JT9.

JT9 is similar to JT65A, but has been totally re-designed for LF and HF work and will decode very weak signals. JT9 in the most common mode will decode signals 2dB weaker than JT65 and it uses just 15.6Hz bandwidth which is less than 10% of the bandwidth that JT65 uses.

World-wide QSOs are possible with power levels of a few watts and compromise antennas.

You can download the new mode from the Princeton site, by clicking HERE.

The new package called WSJT-X offers a “bi-lingual” operating mode in which you can transmit and receive JT65 and JT9 signals, switching between modes automatically as needed. So you do not have to entirely dump JT65.

Here is an article by Keith, G6NHU, detailing his early experiences with JT9.

PSK reporter now shows JT9 spots, so it is possible to see where your signal is reaching even if a QSO does not result from a CQ call.

The new JT9 Yahoo group is rapidly gaining members and is worth joining if interested in this new mode.

You may also be interested in JTAlert which provides several audio and visual alert types based on decoded callsigns within JT65-HF and WSJT-X. You can grab it from HERE.

Recommended JT9 mode frequencies are:

10m 28.078MHz
15m 21.078
17m 18.104
20m 14.078
30m 10.130
40m 7.078
60m 5.2872
80m 3.578
160m 1.838

Be Sociable, Share!