Matching the earth-electrode "antenna" at 472kHz

I get asked how I match my earth-electrode "antenna" at 472kHz. Well, it depends on your ground resistance. At my old QTH I just connected the transverter directly to the earth electrodes as my ground looked like somewhere between 40-60 ohms resistive. I used an audio oscillator and looked for half voltage by adjusting the series resistance. At the "new" QTH the earth resistance is much higher so I added a 3C90 step-up 42mm diameter transformer and adjust the tap on the secondary for maximum antenna current. I am sure the purists will have a good laugh, but it works. Here is a photo showing the arrangement. I am sure the purists will ask how did you determine the windings? In good amateur fashion I experimented and found what worked. Incidentally, I tried the earth-electrode "antenna" on 160m and on the first night was spotted in Sweden! I think it works as a loop in the ground and would be bigger at lower frequencies. At 137kHz it should form quite a large loop in the ground, although I have not tried this band at all at this QTH. I got the 3C90 toroid from Farnell a few years ago. I assume these are still available.

3C90 matching transformer and antenna current meter for 472kHz

Sunspots and 10m - May 3rd 2016

Solar flux is 91 today. Sunspot number is a decent 75. K=4. The forecast for 10m (F2) propagation remains "poor", although we hope Es livens up 10m and maybe 6m.

UPDATE  1600z:  No spots as yet on 10m or 6m WSPR. So far, a very disappointing day here on 6m and 10m WSPR. I shall remain on until dark, ever hopeful!

Returned to 10m and 6m WSPR

Since about 0815z I have been active on 10m WSPR (500mW, 100% TX, randomised freq) and 6m WSPR (1W ERP vertical  20%, RX 80%). I went QRT on MF but may return after dark.

Overnight on MF

No great DX last night on 472kHz WSPR. EA5DOM (1525km) was the best DX on RX again (he is always a good signal when active) and the best TX DX (5mW ERP) was to Holland. There are definitely fewer stations on the band now than at the peak of the season.

10m amd MF WSPRing

It was gone teatime when I noticed no spots at all on 10m. Then I saw the PC had closed the WSPR program to install updates so I had not actually been on 10m WSPR for some time! This may have been several hours! Doh!

Anyway, at 1900z I restarted the PC and did a time resync and started up on 472kHz (630m) WSPR. No great DX so far but I am being copied in the Sheffield area (IO93) and am copying a Dutch station. Nothing special but I am definitely on 472kHz WSPR! I shall remain on this band overnight and switch to 10m WSPR after breakfast.

Fewer swallows definitely - NOT amateur radio

On our recent trip to Lichfield I only saw 1 swallow, confirming what I thought that there are fewer swallows around this year.

They are around now, but I have seen far fewer than in previous years.

I hope this is just a blip, although there have been far fewer house martins than years ago. Is this global warming or an El Nino effect?

Guess what? - NOT amateur radio

Yes, you guessed, Alibris were offering 15% off for 24 hours only.

All quiet on 10m WSPR

As mentioned in an earlier post, I have been on 10m WSPR since just after lunch when we arrived back home.

UPDATE 1600z:  No 10m WSPR spots given or received so far today.#

UPDATE 2200z:  See later post. Doh!  Idiot.

Away so nothing yesterday - NOT amateur radio

We were in Lichfield for my brother-in-law's 70th birthday party, so I was not able to update the blogs. It was a good family get-together. I guess it won't be too long before some of us meet for funerals! It will be some years before there is a round of grandchildren's weddings. For some of these we may be around, but it is unlikely we'll see them all get married. Still, this is how it has always been since time began.

Lichfield is a small city to the north of Birmingham. It has a very nice cathedral with three spires. Unusually, the cathedral is made in red sandstone. It has some fine carvings over the entrance. Lichfield itself is charming with many fine old buildings and a pedestrianised centre. There are 2 large lakes near the cathedral. I guess at one time these were stocked with fish for monks nearby?

More (about China) via Steve G1KQH

This came from Steve yesterday. He like his Chinese bargains!

China cuts TAX, Cuts, not increase! Standby for even Cheaper Baofengs!

http://news.xinhuanet.com/english/2016-05/01/c_135327077.htm

73 Steve
http://www.g1kqh.talktalk.net/