G3WCB on 472kHz

G3WCB (101km) and I are currently exchanging daytime spots on 472kHz WSPR. He is just copying me (on the noise floor) and he is generally about 10dB stronger than I am. I suspect his antenna on TX is considerably better than mine.

Sunspots

The current sunspot count is 158 (good) and 20-30MHz conditions are "normal",  so I'd expect some decent N-S F2 propagation on 10m today. At the moment, I am sticking with MF (472kHz) , but may revert to 10m over the weekend, weather permitting.

We have thunder and lightning possible as the remnants of Hurricane Bertha pass through over the weekend. See http://www.lightningmaps.org/realtime?lang=en .  Currently, the storms are just missing us here in Burwell.

472kHz antennas and results overnight

The Par antenna (strapped feeders) seems to be somewhat better than the 2m/70cm feeder as an antenna on 472kHz.  I have now received 472kHz WSPR spots from 8 unique stations so far.  The Par seems to be directional as reports from GM4SLV (although plentiful overnight) seem no stronger.

Unique 472kHz WSPR spots so far

Tonight,  I shall load up the feeders to my V2000 6/2/70cm vertical and 2m halo on 472kHz as these are my highest antennas and compare results with previous antennas. Best 472kHz DX spot this summer is still from GM4SLV (896km) up in the Shetland Is.. I suspect the Par will be the best antenna though. Really I should make a dedicated 472kHz vertical but my health does not allow me to do this currently, so compromise antennas are the order of the day!

UPDATE 1102z:   GM4SLV was spotting me at 0948z this morning. This daylight!

UPDATE 1107z:  I am very surprised not to have been spotted outside the British Isles so far on 472kHz.  I have copied PA, DL and F so far here as well as UK stations.

M0EMM - 3-6dB stronger reports on 472kHz with Par antenna (strapped feeders)

M0EMM is spotting me on 472kHz WSPR some 3-6dB better than last night because of the change in antenna. I need to recalculate the actual ERP,  but believe it is still in the low milliwatt region.  I shall leave 472kHz WSPR running overnight so I can see who else is getting my signal and at what strength.

6m - little missed. 630m more of a challenge now.

Since QSYing down to 630m MF, I was wondering what I'd been missing on 6m. A quick check on WSPRnet.org suggests only EU Es out to about 2000km, so I am not missing too much. My biggest concern is the moment I abandon the 6m band there will be a collosal transatlantic opening!

At the moment, 630m with real QRP is much more of a challenge.

UPDATE 1920z:   Now 7 unique stations have spotted me on 630m so far this summer.  Plenty more likely.

Unique 630m WSPR spots of my signal so far

472kHz - getting decent results with Par antenna

472kHz WSPR spots of my QRPp signal so far

Results with the end fed Par 10/20/40m antenna (with strapped feeder) are better than with the feeder to the 2m/70cm yagi. Today M0PPP (182km) and G3WCB (101km) have spotted me in the daytime for the first time this season. I came back to the 472kHz band yesterday.

472kHz - improvements?

Using the strapped feeder to my Par 10/20/40m as my 472kHz antenna rather than my 2m/70cm feeder, the antenna current has nearly doubled with the antenna current meter now showing 30-33uA whereas it was 18uA before. This suggests ERP has increased by around 4-5dB (ERP proportional to I^^2), but we'll see later. The Par antenna itself is lower than the 2m/70cm antenna and runs horizontally to a tree. Average height is around 3-4m AGL. The losses may be greater.

The picture shows the 472kHz coil used (a ferrite rod would be fine but since moving it is "lost"), the 472kHz homebrew transverter (left) and the 3C90 matching coil between transverter and antenna (towards centre, LHS of coil). The small meter measures antenna current and registered 18uA last night and 30-33uA now with the Par antenna with strapped feeders.

UPDATE 1420z: G8HUH (250km) is copying in daylight a full 8dB S/N better than last night. Encouraging.

UPDATE 1448z:  M0PPP (182km) seems to be coming in stronger than last night too and in broad daylight.

UPDATE 1700z:  M0PPP  is now spotting me at 1456z, 1538z and 1620z i.e. in daylight.   He was not copying me at all last night, so I think my signal IS stronger.

Shetland on 472kHz WSPR - both ways

Using the very indifferent 2m/70cm feeder antenna (some of this is on the ground) last night I was pleased to exchange WSPR spots with GM4SLV (896km) up in the Shetland Isles as well as being spotted  by M0EMM (192km) and G8HUH (250km) in Somerset.

This was my first outing in MF for many months. In coming evenings I'll try different antennas: none are dedicated 472kHz antennas - all are compromise antennas, usually strapped feeders with a base loading coil.

GM4SLV must have a very quiet RX location as he misses very little and my signal would have been very weak.

472kHz WSPR

For the last hour or so I've been on 472kHz WSPR using just the feeder up to my VHF/UHF beam. Part of the run is along the ground and the antenna is only about 6m AGL. So far, no-one has yet spotted me but I have spotted DK7FC (669km) 7 times so far and M0PPP (182km) 3 times. As usual, I am using my homebrew tranverter. ERP is very low milliwatts with this inefficient antenna.

I may leave WSPR running on 472kHz overnight to see what happens. Tomorrow I will try another "feeder" antenna. This is my first MF "outing" for many months.

UPDATE 2210: DK7FC and M0PPP spotted more times and now F1AFJ (607km) has just been seen.

No 10m F2 this evening?

Only 12 stations in the world currently on 10m WSPR and just LU7YW in South America. I''ll give it another hour or so then may QSY to 472kHz for the first time in months.