No, nothing on JT65A. WSPR is still decoding OK even though nothing
is visible on the SpecJT screen. I;'ve been getting quite a lot of
demods showing sync 404Hz with a S/N -25dB, but can't see anything on
the screen as to why that should be. Just one correct one at 430Hz
(corresponding S/N -30dB, so wouldn't expect copy)
Over the last 2 hours WSPR Rx has only failed to decode 7 times, and
each one of those is still reporting valid sync with a S/N of -21dB or
lower.
Just about to download the Windoze version of WSPR. Pity, I liked the
command line interface in the first version. There's not enough S/W
written with a simple interface these days.
Andy G4JNT
On 22/03/2008, Graham <[email protected]> wrote:
> Ok Andy,
>
> Did you have a better signal early on , or have you a higher local noise
> ... ?
> If signal better early in night , can re-run test over the weekend , the
> results
> of this one are of intrest to the 'man'
>
> Assume the wspr is still decoding at this level ?
>
> Ill check the set up but 10 watts per tone is max before alc
>
> G ..
>
>
>
>
> ----- Original Message -----
> From: "Andy Talbot" <[email protected]>
> To: <[email protected]>
> Sent: Saturday, March 22, 2008 9:43 PM
> Subject: Re: LF: Re: Re: WSPR == ON AIR TEST NOW 1545 HRS = 503 KHz
>
>
> > Set the new freq just after you announced the QSY, and get the
> > occasional demod at DF = +430Hz which is correct for 1700Hz sync. But
> > S/N has fallen and is now in the region of -30dB S/N so oughtn't
> > really to expect a decode.
> >
> > Assuming JT65A is 3dB better than the B version, a S/N of around
> > -25dB ought to be the threshold based on past experience.
> >
> > I'd know better if you could generate 3dB more signal :-)
> >
> > Andy G4JNT
> >
> >
> >
> > On 22/03/2008, Graham <[email protected]> wrote:
> >> Ok Andy,
> >>
> >> Well its decoding off air ok at my qth , keying looks ok offair and at
> >> birmingham ,
> >> im running 10 watts per tone (20 watts peak during dual tx)
> >>
> >> I have just made a qsy inside the passband , to set the jt65 above the
> >> wspr
> >> signal ,
> >> jt65 now using sync tone 1700 Hz dial freq still 501.5 usb
> >>
> >> Im not sure if wspr and wsjt6 will run at the same time , but I can try
> >> over
> >> the wekend
> >> if needs be , ive just downloded the windows version of wspr .. but not
> >> sorted out the
> >> soundcard yet as he's using , 0123 ... very trad hihi
> >>
> >>
> >> Tnx - G ..
> >>
> >>
> >>
> >>
> >>
> >> ----- Original Message -----
> >> From: "Andy Talbot" <[email protected]>
> >> To: <[email protected]>
> >> Sent: Saturday, March 22, 2008 8:28 PM
> >> Subject: Re: LF: Re: Re: WSPR == ON AIR TEST NOW 1545 HRS = 503 KHz
> >>
> >>
> >> > Very Interesting. In the WSJT user screen there are several sucessive
> >> > -19dB S/N individual listings and, out of 70 sequences, it has
> >> > selected 22 of them as being valid, but not one single correct decode.
> >> > Experience on JT65B receiving the GB3RAL and GB3VHF beacons shows
> >> > that -19dB S/N will give perfect copy, and -22dB will decode after two
> >> > or three averaging sessions, so there's something very odd going on.
> >> > What I can make out on the spectrogram, the sync tone is in
> >> > more-or-less the righ place.
> >> >
> >> > Your WSPR signal is just 3 Hz low, and the JT65A sync tone about 15Hz
> >> > lower that stated, which is more than near enough for a valid decode -
> >> > and the user screen shows its doing just as it should - with some
> >> > strong enough individual demods BUT NO DECODES - why???????????????.
> >> >
> >> > Do I understand you are not using the actual WSJT software to encode
> >> > the data? Are you actually sure the MultiPSK implementation is doing
> >> > its job properly.
> >> > Try WSJT 5.98
> >> >
> >> > Andy G4JNT
> >> >
> >> >
> >> > On 22/03/2008, Graham <[email protected]> wrote:
> >> >> Ok Andy,
> >> >>
> >> >> Looks like making headway ....
> >> >>
> >> >> I'm using multipsk (the test version) which has jt65-modes .. and
> >> >> for
> >> >> want
> >> >> of a better way of describing the frequency ..sorry if it sounds a
> >> >> 'cb'
> >> >> like ... but .. ' The purple line' is set at the 1000 Hz mark on the
> >> >> waterfall display giving 1002 hz showing on the l/h fequency window
> >> >> ...as
> >> >> you say is 270 hz (ish) from the normal point ... but if you set the
> >> >> prog
> >> >> to that point , means you can engauge the narrow filter
> >> >>
> >> >> WSPR is running at 1500 Hz tone o/p giving 503.00 khz rf carrier
> >> >> frequency
> >> >>
> >> >> I though jt65 would of out performed wspr ...be intresting to see
> >> >> the
> >> >> parallel decodes
> >> >>
> >> >> Tnx - G ..
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> ----- Original Message -----
> >> >> From: "Andy Talbot" <[email protected]>
> >> >> To: <[email protected]>
> >> >> Sent: Saturday, March 22, 2008 7:03 PM
> >> >> Subject: Re: LF: Re: Re: WSPR == ON AIR TEST NOW 1545 HRS = 503 KHz
> >> >>
> >> >>
> >> >> > Hi Graham
> >> >> > Yes, I've got the right sequence time and am running WSPR and WSJT
> >> >> > 5.98 in parallel. Surprising the WSJT averaging won't extract a
> >> >> > valid
> >> >> > decode. Some of the sessions are being tagged as having the sync
> >> >> > detected, with a resulting 2.5kHz S/N in the --25dB ballpark, but
> >> >> > they
> >> >> > don't want to seem to be pulled together by the averaging. The DF
> >> >> > figure is coming up as -285Hz, suggesting you're 15Hz lower than
> >> >> > advertised (should be -270Hz)
> >> >> >
> >> >> > Do have very bad QRM here. I've just gone over to th the old 137kHz
> >> >> > antenna minus its loading coil rather than the HF vertical that was
> >> >> > the existing 500kHz Rx. The LF Tee is further from the house and
> >> >> > there is about 10dB less localised E field noise. Its a pity about
> >> >> > the deliberate jamming taking place just above the upper tone
> >> >> > frequency. I'm not sure how well JT65 can cope with that.
> >> >> >
> >> >> > Update on the WSPR decodes below - it really does seem a very good
> >> >> > weak signal mode. I'm just about to write June's Data Column for
> >> >> > radcom. I'll give WSPR a section having now played with it for a
> >> >> > while in real hard off-air conditions
> >> >> >
> >> >> > Andy G4JNT
> >> >> >
> >> >> > c:\WSPR>wspr Rx 0
> >> >> > 1750 8 -17 -0.1 0.001487 G0NBD IO83 37 28.3
> >> >> > 1752 6 -18 0.1 0.001487 G0NBD IO83 37 28.3
> >> >> > 1754 5 -20 0.0 0.001487 G0NBD IO83 37 28.2
> >> >> > 1756 3 -20 0.1 0.001487 G0NBD IO83 37 28.4
> >> >> > 1758 8 -18 0.1 0.001487 G0NBD IO83 37 28.9
> >> >> > 1800 8 -14 -0.3 0.001487 G0NBD IO83 37 30.1
> >> >> > 1802 1 -24 0.0 0.001487 28.7
> >> >> > 1804 4 -20 -0.2 0.001487 27.5
> >> >> > 1814 3 -22 -0.2 0.001487 28.1
> >> >> > 1816 1 -23 -0.6 0.001487 27.9
> >> >> > 1818 4 -24 0.0 0.001487 27.8
> >> >> > 1820 7 -19 -0.4 0.001487 G0NBD IO83 37 27.4
> >> >> > 1822 3 -24 -0.1 0.001487 27.6
> >> >> > 1828 2 -24 -0.3 0.001487 20.1
> >> >> > 1830 5 -23 -0.2 0.001487 G0NBD IO83 37 27.2
> >> >> > 1832 4 -20 -0.1 0.001487 G0NBD IO83 37 24.6
> >> >> > 1834 4 -24 -0.3 0.001487 G0NBD IO83 37 21.9
> >> >> > 1836 5 -23 -0.2 0.001487 G0NBD IO83 37 22.8
> >> >> > 1842 2 -24 -0.3 0.001487 G0NBD IO83 37 23.2
> >> >> > 1844 1 -26 -0.3 0.001487 22.3
> >> >> > 1848 7 -19 -0.2 0.001487 G0NBD IO83 37 21.9
> >> >> > 1850 2 -24 0.0 0.001487 24.0
> >> >> > 1852 7 -19 -0.1 0.001487 G0NBD IO83 37 27.3
> >> >> > 1854 5 -19 -0.1 0.001487 G0NBD IO83 37 23.5
> >> >> > 1856 3 -19 -0.1 0.001487 G0NBD IO83 37 24.9
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> > On 22/03/2008, Graham <[email protected]> wrote:
> >> >> >> Ok Andy,
> >> >> >>
> >> >> >> Thanks for taking a look , the jt65 been running for a while now ,
> >> >> >> did
> >> >> >> you
> >> >> >> have
> >> >> >> the 2 systems on when you decoded the wspr signals ?
> >> >> >>
> >> >> >> jt56 is sending at even mins , check the birmingham grabber ,
> >> >> >> should
> >> >> >> show
> >> >> >> the 2 tone sets
> >> >> >>
> >> >> >> Tnx
> >> >> >>
> >> >> >> Graham ,
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >> ----- Original Message -----
> >> >> >> From: "Andy Talbot" <[email protected]>
> >> >> >> To: <[email protected]>
> >> >> >> Sent: Saturday, March 22, 2008 6:17 PM
> >> >> >> Subject: Re: LF: Re: Re: WSPR == ON AIR TEST NOW 1545 HRS = 503 KHz
> >> >> >>
> >> >> >>
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> > --
> >> >> > No virus found in this incoming message.
> >> >> > Checked by AVG.
> >> >> > Version: 7.5.519 / Virus Database: 269.21.8/1338 - Release Date:
> >> >> > 3/21/2008
> >> >> > 17:52
> >> >> >
> >> >>
> >> >>
> >> >>
> >> >>
> >> >
> >> >
> >> > --
> >> > Andy G4JNT
> >> > www.scrbg.org/g4jnt
> >> >
> >> >
> >> >
> >> >
> >> > --
> >> > No virus found in this incoming message.
> >> > Checked by AVG.
> >> > Version: 7.5.519 / Virus Database: 269.21.8/1338 - Release Date:
> >> > 3/21/2008
> >> > 17:52
> >> >
> >> >
> >>
> >>
> >>
> >>
> >
> >
> > --
> > Andy G4JNT
> > www.scrbg.org/g4jnt
> >
> >
> >
> >
> > --
> > No virus found in this incoming message.
> > Checked by AVG.
> > Version: 7.5.519 / Virus Database: 269.21.8/1338 - Release Date: 3/21/2008
> > 17:52
> >
> >
>
>
>
>
--
Andy G4JNT
www.scrbg.org/g4jnt
|
