27 Jul 2014

Second JT9-1 QSO today

This evening I worked my second station on JT9-1, again on 20m as 10m was dead when I listened. The station was DL1KCQ (475km) in JO22 square. He was running 10W to a vertical.  I was using 5W to my Par 10/20/40m end-fed.

I have still to try JT65 and JT9-1 on 10m as the band has not been open when I listened. 20m seems to be an ideal band as it is open pretty often. Although I heard some stateside stations on JT9-1,  none were worked or indeed called. So far 4 JT65 QSOs and 2 JT09-1 QSOs in the log since yesterday.

Anyone know the recommended JT65 and JT9-1 preferred operating frequencies on 40m?  7.076 and 7.078MHz?

A real advantage of JT9-1 is it only occupies just over 16Hz of bandwidth whereas JT65 is about 10 times this bandwidth.  JT9-1 is really only suited to lower HF, MF and LF bands as the tone separation is very small and HF Doppler and rig drift can play havoc.


David (G0LRD) said...

The tone separation of JT9-1 is wider than WSPR (1.736Hz vs. 1.4648Hz), and the shorter transmission lessens the effect of drift/doppler. I've had no problems at all operating on 10m when propagation allows.

I've also had some success calling CQ on a 'dead' band (esp. 10m). There is only about 1dB difference between JT9-1 and WSPR so if there's WSPR activity then a QSO might be possible.
73, David G0LRD

Roger G3XBM said...

I have used JT9-1 on 10m too in the past. Good point about 1 min TX period too. Must give 10m a decent try again.

Roger G3XBM said...

I think 50MHz would be pushing the limits of JT9-1 here.

PE4BAS, Bas said...

As far as I know the 40m freq. are correct for JT. 73, Bas

Roger G3XBM said...

Thanks Bas. May try 40m tomorrow.