20 Jun 2014
6m Doppler
On 6m it is amazing how much Doppler there is on longer distance GDX stations. The screenshot shows just how much Doppler there is on G4BRK's signal today. There were something like 6 aircraft involved at times with WSPR managing to decode when the Doppler is low. On more local signals (e.g. G4FGJ) there is much less (or nil) Doppler. Clearly aircraft reflection plays an important part in long GDX paths. I have no idea where these planes are located.
19 Jun 2014
6m - yet more GDX this evening
Even if Es is not around for me on 6m WSPR, then GDX certainly is.
Just a few moments ago G4BRK (134km) was spotting me at -18dB S/N with low Doppler (1Hz). I seem to regularly get GDX stations in the log, most usually as a result ( I think) of favorable aircraft alignment. If the planes are moving along the path between me and the other station then Doppler is normally too bad and no decodes occur. If the plane crosses the path then Doppler is usually low and there is a better chance of WSPR decoding. Clearly, modes that are sensitive and more Doppler tolerant would mean such long GDX paths would be workable - JT65 or JT9-1 maybe?
There are software packages used by microwave guys that show aircraft movements in relation to paths between stations, allowing one to work out when planes en route would be most favorably aligned to allow a path to be worked. My memory fails me on the package name, but it was mentioned in a blog post earlier this year by G3WKW. UPDATE 1925z Friday: Bob has kindly reminded me of the software (see comment below too) http://www.airscout.eu Airscout.
134km (83.5 miles) is a very decent distance on 6m inter-G with QRP. I wonder if a horizontal halo would be better or worse? If signals are being scattered off aircraft, then polarisation is less important. A halo would probably have less gain than my V2000 vertical 2dbD omni for halo(?) and 0dBD omni for V2000(?). I guess it will also depend on the other station's polarisation. For pure tropo, I suspect a halo would be better to other stations equipped with horizontal beams, but few GDX paths seem to be pure tropo on 6m.
Just now G8DOR (103km) and G8JNJ/A (184km) were spotting me on 6m WSPR.
Just a few moments ago G4BRK (134km) was spotting me at -18dB S/N with low Doppler (1Hz). I seem to regularly get GDX stations in the log, most usually as a result ( I think) of favorable aircraft alignment. If the planes are moving along the path between me and the other station then Doppler is normally too bad and no decodes occur. If the plane crosses the path then Doppler is usually low and there is a better chance of WSPR decoding. Clearly, modes that are sensitive and more Doppler tolerant would mean such long GDX paths would be workable - JT65 or JT9-1 maybe?
There are software packages used by microwave guys that show aircraft movements in relation to paths between stations, allowing one to work out when planes en route would be most favorably aligned to allow a path to be worked. My memory fails me on the package name, but it was mentioned in a blog post earlier this year by G3WKW. UPDATE 1925z Friday: Bob has kindly reminded me of the software (see comment below too) http://www.airscout.eu Airscout.
134km (83.5 miles) is a very decent distance on 6m inter-G with QRP. I wonder if a horizontal halo would be better or worse? If signals are being scattered off aircraft, then polarisation is less important. A halo would probably have less gain than my V2000 vertical 2dbD omni for halo(?) and 0dBD omni for V2000(?). I guess it will also depend on the other station's polarisation. For pure tropo, I suspect a halo would be better to other stations equipped with horizontal beams, but few GDX paths seem to be pure tropo on 6m.
Just now G8DOR (103km) and G8JNJ/A (184km) were spotting me on 6m WSPR.
Concentrating on one or two bands?
With limited space for antennas, it seems sensible to concentrate efforts on just a couple of bands only. As my favorite band is 10m, I am tempted to erect a more efficient antenna for this band and maybe put up the 6m V2000 only during the Es season. My problems are (a) a lack of mobility because of my stroke and (b) choice of compact, efficient antennas. At present I can cover 40, 20, 10, 6, 2 and 70cms, plus 630m rather inefficiently with my earth electrode antenna. Perhaps, whilst my health is not too good, I am better sticking with what I've got? I know that on 10m my antenna could be better but the Par end-fed covers 3 bands (10, 20 and 40m) and my 2W QRP has reached VK on WSPR on all these bands and doesn't do a bad job.The Par is is almost impossible to see in the air.
Back on 6m WSPR
After a couple unsuccessful attempts on 20m and 40m JT65, I have returned to WSPR on 6m again this afternoon. So far just locals and GDX (DX within G land) and no signs (yet) of any Es. At least one east coast USA station is now monitoring 6m WSPR (Gary KC1AWS). Hopefully there will be more.
Stations copying my 1W ERP today so far on 6m are G4IKZ (18km), G4FFC (45km) and G0OQK (98km). I am still hopeful of 6m Es.
Stations copying my 1W ERP today so far on 6m are G4IKZ (18km), G4FFC (45km) and G0OQK (98km). I am still hopeful of 6m Es.
40m WSPR - a total change
Just for a change I QSYed firstly to 20m for a few WSPR spots and then on down to 40m for the morning. Spots (both of me and others) are easy at the 2W level. No great DX seen, just EU stations. The antenna is the Par 10/20/40m end fed which is also used for 10m and 20m. It has an average height of around 4-5m above ground, so probably quite a high angle on 40m. I have been copied in VK on 40m with this set-up though and with just 1W RF.
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| 40m unique WSPR spots this morning |
18 Jun 2014
6m GDX tonight
No Es here on 6m WSPR since I QSYed to 6m around 1500z. There has been some GDX again, G8JNJ/A (184km) was spotting me at -24dB S/N at 2128z. Doppler was low suggesting tropo without aircraft reflections, or aircraft crossing the path at right angles (so little/no Doppler).
Again I am bitterly disappointed with the lack if USA/Canadian east coast stations on WSPR. As of 2145z there were still ZERO stations active on WSPR from that area. Come on lads! Give we Europeans a chance of being spotted over there!
Unless there is some interest from the east coast USA/Canada on WSPR very soon it will be time to abandon 6m WSPR this season. I have been spotted all over Europe, in N.Africa and in Israel (3519km) with just 1W ERP in the last few months. I was hoping for the USA or Canada on WSPR this season. If there are zero stations at the other side there is no point in continuing.
Again I am bitterly disappointed with the lack if USA/Canadian east coast stations on WSPR. As of 2145z there were still ZERO stations active on WSPR from that area. Come on lads! Give we Europeans a chance of being spotted over there!
Unless there is some interest from the east coast USA/Canada on WSPR very soon it will be time to abandon 6m WSPR this season. I have been spotted all over Europe, in N.Africa and in Israel (3519km) with just 1W ERP in the last few months. I was hoping for the USA or Canada on WSPR this season. If there are zero stations at the other side there is no point in continuing.
6m - active WSPR stations : why so few?
This shows the total number of stations active in the whole world on 6m WSPR - just 35. As you can see, there is zero activity in the eastern seaboard states of the USA or Canada apart from W4.
Please, please give this very sensitive mode a try. It is about 12-14dB better than CW so very modest antennas and low power are fine. Even just on RX would be a start. Nearly half in the world on 6m WSPR is just receiving. There are transatlantic openings being missed.
Please, please give this very sensitive mode a try. It is about 12-14dB better than CW so very modest antennas and low power are fine. Even just on RX would be a start. Nearly half in the world on 6m WSPR is just receiving. There are transatlantic openings being missed.
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| Just 35 stations worldwide active on 6m WSPR at 1915z |
Back on 6m - missing out on DX with WSPR?
Since around 1500z I QSYed back to 6m from 10m. 6m activity levels from DX stations are still disappointingly low: only last evening PE4BAS was working WP4 (Caribbean) with just an FT817ND (QRP) and V2000 vertical using JT65 digital mode. See http://pe4bas.blogspot.co.uk/2014/06/magic-on-magic-band.html .
At the moment WSPR is not the best mode to get DX, which is a great pity, as it is probably the mode that works best with very weak signals.
Since 1500z only G4IKZ (18km) and G0OQK (98km) spotting me on 6m WSPR. No sign of any Es.
UPDATE 1855z: a short while ago G6AVK was spotting me at -26dB S/N at 78km. Still no Es here.
UPDATE 1900z: Sunspot count is 87 and 20-30MHz propagation forecast now only "fair". It was "normal" earlier in the day, so conditions for HF F2-layer propagation have deteriorated.
At the moment WSPR is not the best mode to get DX, which is a great pity, as it is probably the mode that works best with very weak signals.
Since 1500z only G4IKZ (18km) and G0OQK (98km) spotting me on 6m WSPR. No sign of any Es.
UPDATE 1855z: a short while ago G6AVK was spotting me at -26dB S/N at 78km. Still no Es here.
UPDATE 1900z: Sunspot count is 87 and 20-30MHz propagation forecast now only "fair". It was "normal" earlier in the day, so conditions for HF F2-layer propagation have deteriorated.
New Chinese multi-mode HF rig - Xiegu X108
Steve, G1KQH has sent this link about a new Chinese multi-mode transceiver. See http://www.brickolore.com/ . Prices start at 2800 Yuan apparently. It is called the Xiegu X108. There is a video and some pictures of the rig.
To my mind, this still looks like a "back shed" radio, rather than a mature, well engineered and thoroughly well tested radio. I may be wrong. I am still waiting to see when the Chinese launch a proper Yaesu or Icom competitor. These will come but I've not seen one yet. Maybe in the next 12 months?
To my mind, this still looks like a "back shed" radio, rather than a mature, well engineered and thoroughly well tested radio. I may be wrong. I am still waiting to see when the Chinese launch a proper Yaesu or Icom competitor. These will come but I've not seen one yet. Maybe in the next 12 months?
10m WSPRing again
In view of the poor level of DX activity on 6m WSPR, I have started today on 10m. Near immediate success with 3 spots of OE6PWD (1230km) around 0900z. This is clearly Es. Looking at my spots, I think I caught the tail end of an Es opening (reports are getting worse over time).
Sunspot count today is 87 and 20-30MHz conditions are "normal", so we may see some long distance F2-layer propagation on 10m. May try 6m later, if some DX stations (esp. USA and Canada) are active. Otherwise I'll stay on 10m.
FR1GZ (9724km) was spotted at 0922z for the first signs of F2 propagation. The band is clearly open N-S for real DX.
UPDATE 1411z: FR1GZ has spotted me a couple of times and he has been a consistent F2-layer signal all day with around 13 spots in the log today. OH6GKW (1839km) is now being spotted on Es.
Sunspot count today is 87 and 20-30MHz conditions are "normal", so we may see some long distance F2-layer propagation on 10m. May try 6m later, if some DX stations (esp. USA and Canada) are active. Otherwise I'll stay on 10m.
FR1GZ (9724km) was spotted at 0922z for the first signs of F2 propagation. The band is clearly open N-S for real DX.
UPDATE 1411z: FR1GZ has spotted me a couple of times and he has been a consistent F2-layer signal all day with around 13 spots in the log today. OH6GKW (1839km) is now being spotted on Es.
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