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.

5 comments:

David (G0LRD) said...

Roger,
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.