Hi Jose My radio was monitoring 40m last night when I was sleeping . My antenna is a homemade vertical dipole for 20m and I was surprised to see your signal on my screen this morning. Would you make it another try to night and I promise you I will stay awake to try to connect you ?
73 de LA5VNA Steinar Jose A. Amador wrote: > > > I finally read the WSJT manual, quite quickly indeed, and from it I > could gather the following: > > "Encoded user information is transmitted during the 63 intervals not > used for the sync tone. Each channel symbol generates a tone at > frequency 1275.8 + 2.6917 Nm Hz, where N is the value of the six-bit > symbol, 0 < N < 63, and m is 1, 2, or 4 for JT65 sub-modes A, B, or C. > > The signal report OOO is conveyed by reversing sync and data positions > in the transmitted sequence. Shorthand messages dispense with the sync > vector and use intervals of 1.486 s (16,384 samples) for the alternating > tones. The lower frequency is always 1270.5 Hz, the same as that of the > sync tone, and the frequency separation is 26.92 nm Hz with n = 2, 3, 4 > for the messages RO, RRR, and 73." > > So, assuming N is the 63rd symbol in JT65A (m=1), it yields: > > 1275.8 + (2.6917 * 63) = 1275.8 + 169.5771 = 1445,3771 Hz > > The shift is less than 170 Hz !! > > And for 73: > > 1275.8 + (26.92 * 4) = 1275.8 + 107,68 = 1383,48 Hz > > The shift is 107,68 Hz! > > So, JT65A never occupies more than 170 Hz on the air, which is quite > tolerable indeed. > > Figuring out all this, I wanted to corect my previous post. Yes, it is > wider than PSK31, but not quite as wide as RTTY. > > 73, > > Jose, CO2JA > > PS: I have been monitoring quite a few QSO's on 7076 this evening! > > __________________________________________ > > V Conferencia Internacional de Energía Renovable, Ahorro de Energía y > Educación Energética. > 22 al 25 de mayo de 2007 > Palacio de las Convenciones, Ciudad de la Habana, Cuba > http://www.cujae.edu.cu/eventos/cier > <http://www.cujae.edu.cu/eventos/cier> > > Participe en Universidad 2008. > 11 al 15 de febrero del 2008. > Palacio de las Convenciones, Ciudad de la Habana, Cuba > http://www.universidad2008.cu <http://www.universidad2008.cu> > >
