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WSJT-X for LF: Now I really will have to look at a top band antenna…
30 October 2012 | by A couple of days ago, I read a post that the wonderful Joe Taylor, K1JT was working on a new mode for use on LF. It wasn’t until this evening that I read up a little more.
Joe says, on wsprnet.org
“If you are on 160 meters, or perhaps on 472 or 137 kHz, you may be interested in a new mode called JT9, designed especially for making QSOs on these bands. JT9 uses the structured messages introduced in 2003 for the JT65 mode, now widely used for EME and for QRP operations at HF. JT9 can operate at signal levels as low as -27 dB (in a 2500 Hz reference bandwidth), with one-minute timed transmissions. It also offers slower transmissions of 2, 5, 10 and 30 minutes duration, and the slowest mode can decode signals as weak as -40 dB. With one-minute transmissions, submode JT9-1 has a total bandwidth of 15.6 Hz — less than one-tenth the bandwidth of a JT65A signal. The other submodes are narrower still: a JT9-30 signal occupies about 0.4 Hz total bandwidth.
http://www.physics.princeton.edu/pulsar/K1JT/WSJT-X_Quick_Start_Guide.pdf ,
and an early version of WSJT-X can be downloaded from
http://physics.princeton.edu/pulsar/K1JT/WSJTX_01r2695.exe .
9 Responses to “WSJT-X for LF: Now I really will have to look at a top band antenna…”
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This is very cool.
I ran JT65 on 160m last winter and had a blast, even though I got the antenna (Inv-L) up late. Here it is over a year later and I still (haha) am late getting the antenna up. Maybe I’ll get one last mow in for the season and then string it back up again. If I’m very industrious, I’ll set up the K9AY loop system I bought. In fact, I may have to do that just to make sure everything works. I got it with the intention of having it when we transferred to the UK, which seems to be in a bit of a holding pattern now.
I also had reasonably good luck with SSB, but this year I’ll have some real power with the Clipperton L that I bought.
Hope to see you on the bands!
A friend who lives about 15 miles away and I were experimenting on 1.838 with JT9 the other night. We got down to one watt output, still perfect copy.
I’ll have to try someone a little farther away to experiment with.
If you want to try this mode out but can’t work on 160 meters, look at 10.130. Lots of activity there except for the wee hours EST time.
David, N1ZHE
On 1939.5 Mhz Also
Sorry 1.839.5 Mhz
I’ve had a handful of QSOs w/JT9-1 and look forward to more.
So far I’ve seen action on 10.130, 14.078, 18.103 and 24.919.
vy 73, de frank k2ncc in Oregon
muy bueno toda la publicacion
Interesting website look forward to reading newsletter.
HI just became aware of JT9.I only have bands 10-20-40.How much equip.doI need
and how expensive is it I have a complete station at moment and use mostly cw.I have one windows vista computer.
look forward to hearing from you Matt Furlong wd9dmm
I have been a Top Band user for over 30 years. I will be using JT-65 from my sunset here in Waikiki and hope to make my first QSO on that QRG and mode.
I will call CQ until someone hears me.
73 Bob KH6KG