VHF/UHF WSPR Waterfall images
Re: 2m WSPR Waterfall images
Check this lot out from this evening with the antenna beaming Melbourne.
Not sure how I got anything from VK3DXE's last TX
Also the period before, I think DXE may have been TXing for this one also as well as VK2YW. You can also see a straight line of noise across the screen, thats what happens when I decode each new ship for the first time after clearing the past 24 hr activity in Shipplotter.
Not sure how I got anything from VK3DXE's last TX
Also the period before, I think DXE may have been TXing for this one also as well as VK2YW. You can also see a straight line of noise across the screen, thats what happens when I decode each new ship for the first time after clearing the past 24 hr activity in Shipplotter.
Re: 2m WSPR Waterfall images
Almost looks like freq spread of some sort on VK1KW's signal with aircraft doppler reflection.
Amazing that Robs signal decoded through all this.
Amazing that Robs signal decoded through all this.
Re: VHF/UHF WSPR Waterfall images
Big meteor burst captured from Jeff VK5GF on 6m, as you can see there was a few minor pings, then about 20 sec before the end of the period it went solid
Re: VHF/UHF WSPR Waterfall images
I heard the same burst Leigh, and I just managed to get a screen shot before it went off the WSPR screen.
P.S> received on a vertical @ 6.5m height. Would've been a big signal if I was on the yagi !
P.S> received on a vertical @ 6.5m height. Would've been a big signal if I was on the yagi !
Re: VHF/UHF WSPR Waterfall images
Captured these dramatic looking 2m WSPR signals from Alan VK3DXE. Tropo signal plus doppler shifting AE across it.
Re: VHF/UHF WSPR Waterfall images
An unusually wide scattered signal from Jeff VK5GF to my location, about 764 km. This may be backscattering from a highly charged part of the E layer this evening where there were good paths from VK5GF to VK1JA and also to ZL2DX.
I could not decode Jeffs signal here as they were to wide and distorted (Jeffs signal indicated by arrow on screen).
I could not decode Jeffs signal here as they were to wide and distorted (Jeffs signal indicated by arrow on screen).
Re: VHF/UHF WSPR Waterfall images
A crazy AE slider pointing west today, the one at 07:16 probably was from Rob VK1KW, but unsure who the one at 07:12 was!
Re: VHF/UHF WSPR Waterfall images
Jayson, was possibly VK3JTM?
07:12 VK3JTM 144.490466 -17 0 QF12lr 100 VK5GF PF94hk
07:12 VK3JTM 144.490466 -17 0 QF12lr 100 VK5GF PF94hk
Re: VHF/UHF WSPR Waterfall images
Some scattering occurred on 6m WSPR signals today. The interesting one was a local
signal by VK5SIX which suffered some scattering then returned to normal fairly quickly
as the screen capture below shows.
73 de Rob VK5ZRL
signal by VK5SIX which suffered some scattering then returned to normal fairly quickly
as the screen capture below shows.
73 de Rob VK5ZRL
73 de Rob VK5ZRL
PF95gc
PF95gc
Re: VHF/UHF WSPR Waterfall images
Fascinating.
A general question - what rx bandwidth do you set on the radio?
As narrow as possible, or normal SSB bandwidth?
Thanks.
A general question - what rx bandwidth do you set on the radio?
As narrow as possible, or normal SSB bandwidth?
Thanks.
Re: VHF/UHF WSPR Waterfall images
Rob,
Regarding VK5SIX scattering, I noticed when John was beaming one way there was massive scattering and then the other direction it was gone. Some very high MUF happening there somewhere.
Glenn, I've done a little bit of testing regarding bandwidth. Its not really required to narrow it up, unless there is a close by strong signal or interference. I've tried to do it on 160m with lightning static etc, but the resulting SNR is worse with the narrower bandwidth (400 Hz) than something like 1500 or 2000 Hz BW. On 10m I found 400 Hz was quite OK and lived with it there most of the time. Everywhere else is 1500 Hz.
Regarding VK5SIX scattering, I noticed when John was beaming one way there was massive scattering and then the other direction it was gone. Some very high MUF happening there somewhere.
Glenn, I've done a little bit of testing regarding bandwidth. Its not really required to narrow it up, unless there is a close by strong signal or interference. I've tried to do it on 160m with lightning static etc, but the resulting SNR is worse with the narrower bandwidth (400 Hz) than something like 1500 or 2000 Hz BW. On 10m I found 400 Hz was quite OK and lived with it there most of the time. Everywhere else is 1500 Hz.
Re: VHF/UHF WSPR Waterfall images
G'day Leigh,
I think John was beaming VK6 when the scattering was evident.
G'Day Glenn,
In my own case, bearing in mind that I am in the "burbs and suffer with
all sorts of noises, I set the filter on the IC-7000 at 1200 Hz for WSPR operation
and use that on all bands.
If you are away from suburban noise sources normal SSB bandwidth should be ok.
Cheers.
I think John was beaming VK6 when the scattering was evident.
G'Day Glenn,
In my own case, bearing in mind that I am in the "burbs and suffer with
all sorts of noises, I set the filter on the IC-7000 at 1200 Hz for WSPR operation
and use that on all bands.
If you are away from suburban noise sources normal SSB bandwidth should be ok.
Cheers.
73 de Rob VK5ZRL
PF95gc
PF95gc
- VK3ZAZ
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Re: VHF/UHF WSPR Waterfall images
Given you are capturing a 100HZ FSK probably as narrow as possible.VK4DU wrote:Fascinating.
A general question - what rx bandwidth do you set on the radio?
As narrow as possible, or normal SSB bandwidth?
Thanks.
I have tried using various Roofing bandwidths down to 600HZ
It doesn't seem to make much difference
I am regularly seeing -29 and -28 db out here in the countryside in a low noise environment
I am also able to use an MH2 mast head preamp which is probably unlikley in city areas.
What amazed me last night was the ability to receive VK6OX on a pair stacked HO loops from the RMV beacon service propped up in a stack of tyres 10 feet off ground
From what I see/hear signals are unworkable on CW/SSB are viewed all day on my receivers out here from all directions
I also notice a consistant dx limit of signals 400-500-600K on 6 and 2M not unheard of all the time.
Its a pity you cant sort the wspr spots by other methods
I will try to past into a spread sheet to see what works..
Tread your own path
Re: VHF/UHF WSPR Waterfall images
High MUF E around areas of western VK3 and close by locations this evening.
Here is a screen shot showing big scattered 6m signal from John VK5PO while he was beaming at VK7FI. WSPR sigs usually about 7 Hz, this one is coming up at about 35 Hz currently. John is only 770 km from here.
Probably a hint of VK3ZAZ before this. You can VK3ZAZ was up to -16 in the deocodes prior from only 527 km on 2 x loop antennas.
Here is a screen shot showing big scattered 6m signal from John VK5PO while he was beaming at VK7FI. WSPR sigs usually about 7 Hz, this one is coming up at about 35 Hz currently. John is only 770 km from here.
Probably a hint of VK3ZAZ before this. You can VK3ZAZ was up to -16 in the deocodes prior from only 527 km on 2 x loop antennas.
Re: VHF/UHF WSPR Waterfall images
Not sure what causes this, but I occasionally get it - double decodes with one fading out while the second signal fades in.
It's pretty rare though.
It's pretty rare though.
Re: VHF/UHF WSPR Waterfall images
Interesting one from my perspective tonight. I'm close enough to VK3DXE that when he's transmitting, my Rx noise goes from it's normal 2-3dB to 25+ dB. Whenever that's happening, I get a "shadow" of Alan's signal a bit further up the waterfall (which I understand is probably due to my soundcard?).
At 0928 it looks like my WSPR has decoded the shadow AND the main signal.
At 0928 it looks like my WSPR has decoded the shadow AND the main signal.
Re: VHF/UHF WSPR Waterfall images
Had an interesting looking signal from Rob VK1KW this evening I thought I would post up -
Re: VHF/UHF WSPR Waterfall images
The freq difference is 36Hz, same callsign... so it looks like the same tx being recieved by two paths with some relative Doppler shift. 36Hz is not a large Doppler shift at that freq.VK1JA wrote:Not sure what causes this, but I occasionally get it - double decodes with one fading out while the second signal fades in.
It's pretty rare though.
The quite small change in the Doppler on each signal might be explained by two aircraft travelling the parallel lanes and about the same position along the path to give similar but opposite shifts.
If you watch the Flightradar, you might find scenarios where that might happen, and observe what you see on WSPR (if someone in the right place is transmitting that interval).
Leigh shows a similar observation in a post just prior to this.
Owen
Re: VHF/UHF WSPR Waterfall images
More often than not, the parallel traces on strong(ish) signals is due to overload in the computer's soundcard. Easily repeatable.VK2OMD wrote:The freq difference is 36Hz, same callsign... so it looks like the same tx being recieved by two paths with some relative Doppler shift. 36Hz is not a large Doppler shift at that freq.
The quite small change in the Doppler on each signal might be explained by two aircraft travelling the parallel lanes and about the same position along the path to give similar but opposite shifts.
If you watch the Flightradar, you might find scenarios where that might happen, and observe what you see on WSPR (if someone in the right place is transmitting that interval).
Leigh shows a similar observation in a post just prior to this.
Owen
Alan VK3DXE
QF21nv
QF21nv