Menu
▾
▴
Re: [wsjt-devel] Hints for MSK144 operation
|
From: Charles S. <g3...@gm...> - 2025-05-10 19:20:33
|
Hi Marco QRM from terrestrial stations certainly makes MSK144 somewhat difficult especially during showers. Here in Europe we generally use 30s periods, although some use 15s, which can block out half a period! There are supposed rules for even and odd periods based on beam headings in use, and also local rules about first and second period. Sometimes the rules are in conflict! One thing we have learned is to try not to conduct QSOs on a calling channel, but many do this with consequent QRM. Better is to reply to stations who call CQ with a QSY frequency, so the actual QSO is conducted off the calling channel, 73 Charlie DL3WDG On Sat, 10 May 2025 at 20:17, Marco Calistri via wsjt-devel < wsj...@li...> wrote: > Thanks Reino, > > Yes, I read the User Guide relatively to MSK144, but I like to have direct > experience sharing with other users too. > > Both my HW are not so kind of new products: radio is a Yaesu FT-100 and > computer is a Lenovo Ideapad Core i5, with 8G and 1T SSD disk. > > I've been able to do a MSK144 QSO with a station which is about 250 Km > away from my QTH, then it has not been a meteor scatter QSO. > > But what let me more doubtful about MSK144 are the lack of decoding during > reception of local transmissions by nearby stations: > > I mean is it caused by some wrong settings in WSJTX? > > And the other is related to the antenna requirements, since my antenna is > a small 2 elements not steerable Moxon. > > 73's de Marco PY1ZRJ > > > Il 10/05/25 12:41, Reino Talarmo ha scritto: > > Hello Marco, > > User Guide 9.5 MSK144 gives answers to most of your questions. Please note > that MSK144 is a totally different protocol than e.g. FT8. It uses the > whole audio bandwidth and, in that sense, there is only a single ‘correct’ > audio transmit and reception frequency, in most if not all rigs it is 1500 > Hz. Your receiver bandwidth should be 300 Hz to 2400 Hz or more. If > possible, I would set it wider as the then the receiver should perform > better. Also a symmetric bandwidth around 1500 Hz should be a good > selection on the decoding point of view. > > The selection of the Decode level and Ftol depends on your computer > capabilities. A modern one should manage Deep and 200 Hz. > > You may try Tx even/1st selection, but I don’t know whether in your > region has a rule how to select it depending on the antenna direction. > > > > 73, Reino OH3mA > > > > *From:* Marco Calistri via wsjt-devel <wsj...@li...> > <wsj...@li...> > *Sent:* Saturday, May 10, 2025 2:57 PM > *To:* 'WSJT software development' <wsj...@li...> > <wsj...@li...> > *Cc:* Marco Calistri <PY...@ou...> <PY...@ou...> > *Subject:* [wsjt-devel] Hints for MSK144 operation > > > > Hello, > > I'm totally new to MSK world and I would like to get some hints by > experienced users about right settings to use with WSJT-X, as well as > additional directions. > > Let's see the settings first: > > > > > 1. *Decoding*: FAST, NORMAL, DEEP (what is the format used > normally?) > 2. *F Tol: *I let this always to 200 > 3. *RX*: here I would like to ask: why program start with 160 Hz > if the majority of ham operators use 1500 Hz? > 4. *T/R*: here we have to set to 15 or 30 seconds? > > Other doubt is related to monitoring local stations that are not > coming trough scatter reflection, in this case (direct propagation to > nearby station) normally the decoding fails and WSJT-X doesn't show > any message, is this normal? > > - What are the best hours to expect a possible MSK144 propagation > (of course considering the availability of a meteor shower), I mean during > the day or during the night? > > > - Is it necessary to use an AZ/EL antenna to operate MSK or not? > > > Many thanks for your kindest attention! > > > > --- > > *73 de Marco, PY1ZRJ (former IK5BCU) * > > > > _______________________________________________ > wsjt-devel mailing list > wsj...@li... > https://lists.sourceforge.net/lists/listinfo/wsjt-devel > |
