3508Re: WSJT ON hf bands
- Mar 22, 2007Fascinating!
Please publish the primary frequencies that you are using for each of
Thanks for the info!
73, Marsh, NC7V in WA
--- In email@example.com, Joe Taylor <joe@...> wrote:
> Hi Mike,
> Your results with JT65B on HF are very interesting!
> I encourage you to try the same experiments using JT65A,
> some time soon. Your bandwidth requirements will then be
> cut in half, to only 178 Hz. This means half as much chance
> for in-band QRM from other signals, and it means less QRM
> from your signal to other operators.
> Frequency stability and doppler broadening should be only a
> minor factor on the HF bands, and JT65A should give you
> about 1 dB better sensitivity than JT65B.
> With best wishes,
> -- 73, Joe, K1JT
> Mike wrote:
> > For the past three weeks I and a few other Hams have been trying JT65B
> > on the HF bands with some degree of success. One of the most popular
> > frequencies is 18.102. So far I have had A QSO with at least 8
> > different stations including 8Q7WB and JE5FLM. These contacts were on
> > bands that were supposedly dead or nearly dead at the time. My
> > observations about the JT65B mode on HF is that the software is very
> > good at decoding signals as low as -26db, surrounded by PSK/RTTY/AMTOR
> > QRM and a considerable amount of QRN.
> > 8Q7WB was worked at -24db with PSK at +400hz and -500hz and some local
> > QRN. JT decoded every transmission from Isao with no problem despite
> > the PSK signals being anywhere from S2 to S5 on the meter.
> > Since I can very rarely use 6 and 2 meters anymore due to horrendous
> > line noise that doesn't seem to bother most of the HF bands I find
> > that JT65B on HF is fun. It's not EME but on a dead band it can be a
> > bit exciting.
> > I am not using a big antenna setup on HF, just an 80M delta loop and
> > 25 - 30 watts output. So far I have made QSO's on 40, 30, 20 and 15
> > with JT65B.
> > Mike VE3FGU
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