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
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