481THz NLOS (over the horizon)

Before my stroke in 2013 I enjoyed building and operating optical communications gear. My stroke has rather scuppered this, for now! Although I had one over 10km line-of sight speech contact with G4HJW/P, my main interest was weak signal, over the horizon, communication. I did tests at over 8km non line-of-sight using QRSS3. Although there was no evidence of the optical signal in the sky, the QRSS3 signal was clearly decoded on the PC at the receive end. Overall, I was left with the impression that much further would have been possible.

At some point I really want to continue this work. All my optical gear was home-made using material that was low cost and easily obtained. Test gear for optical work was simple and low cost too. In my view, optical work is more rewarding than microwaves and the test gear simpler.

See https://sites.google.com/site/g3xbmqrp3/optical

St Johns College, Cambridge, UK - NOT amateur radio

Recently, we visited the Backs (of the colleges) in nearby Cambridge, UK. With all the flowers out, this really is a sight. This is in the grounds of St Johns College.

We really are quite lucky living so close. As residents, we get free entry into the colleges.

Sunspots and 10m - Monday March 20th 2017

Solar flux is 72 and the sun remains spotless (as in no sunspots rather than recently polished). A=2 and K=0. I think any sunspots appearing from now on will be a bonus!

See http://news.spaceweather.com/sunspots-vanish-space-weather-continues/

6m MSK144 RX and 10m WSPR TX (again)

Yet again I am on 6m MSK144 RX and 10m WSPR TX. So far, just Gs south west of London spotted on 6m, but no spots on 10m WSPR. I have been active since about 0745z.

UPDATE 0950z: No 10m WSPR spots still and no further 6m MSK144 spots as yet.

UPDATE 1050z: DF5VAE (904km) spotted on 6m MSK144 RX.

UPDATE 1430z: 6 stations in 4 countries spotted so far on 6m MSK144. No spots on 10m WSPR.

UPDATE 1545z:  7 stations in 5 countries now on 6m MSK144 RX today.

UPDATE 1735z: 9 stations in 7 countries on 6m MSK144 RX today so far.

6m MSK144 RX today

UPDATE 2100z: G3YDY (65km) is the latest station to be spotted on 6m MSK144. What amazes me is how strong all stations are. I think most stations have positive S/N ratios and the weakest is -3dB S/N. Even quite distant stations are strong. If random MS, this suggests the ionised trails reflect really well.  If aircraft reflection, the reflected signals are very good.

472kHz WSPR RX

I have now gone QRT on all bands, but I am monitoring 630m (472kHz) WSPR. So far DF2JP (448km) and G8HUH (250km) spotted. As usual, I am using the earth-electrode "antenna" in the ground and the (deaf) FT817.

UPDATE 2140z: Not a bad evening so far on 472kHz WSPR RX.

Unique stations spotted on 472kHz WSPR RX this evening

10m in the quiet years

Firstly, 10m is good for Es (sporadic-E) at any part of the solar cycle. In the northern hemisphere May-August are the best Es months. There is a smaller peak around December-January. There are many theories about Es. Also, as mentioned before, N-S real DX can occur on 10m even in the quietest solar periods with no sunspots.

As 11m CB demonstrates, 10m is a useful band for local nets - the proverbial "natter across town". 4W from a converted CB FM rig regularly enabled me to work 30km with a CB halfwave antenna.

Another possibility is a derivative of my Tenbox AM rig. Simple to make and a possible club project? What was done before my stroke is a possible source of ideas.

See https://sites.google.com/site/g3xbmqrp3/hf/tenbox .

If you follow the link and click the schematic it will bring up a larger clearer version.

Northern Ireland - NOT amateur radio

One of the thorny Brexit issues will be Northern Ireland (Ulster). This has a land border with Eire which will remain in the EU. Currently, there is free movement north and south across this border. What happens when the UK leaves the EU?

Most unionists do not want a united island of Ireland. Most in Sin Fein would like to see the island reunited. I, for one, do not see how this will be resolved. Maybe a political "fudge" with the north somehow independent? No, I think Theresa May, the UK PM, has a really tricky issue here.

Where I come from - NOT amateur radio

My ancestors come from South Devon. Many still live near here. I have a continuous genealogy back to the mid-1500s and one of my ancestors owned a piece of land near here in 1428. It is good to think of them enjoying this all those years ago. The cycle of life goes on.

QRP and QRP Club

As usual, Oleg has reported on QRP Club:

Dear Club 72 members and friends,

Weekly QRP Rendez-Vous Report (March, 19, 2017)
Visitors  of  the  week: R1CAF, RW3AA, UR7VT, IK0SDA, UR5EFD, SM2FIJ,
UA1CEG, US3EN, RU3NJC, UA0SBQ, IK2UUR, UA1CEX, G3XJS, DK1HW, HB9CBR/p,
UR0ET,  R2ABT,  RV3GM,  US5ERQ, UA4NU, R1CAN, ON6KZ, RA1M/mm, IK2RGV,
RX3DOR, OH6NPV, OF5LP, IW2MXE, SV2BBK, UA6HZ, HA7NE
New Visitors: IK0SDA, IK2UUR, HB9CBR/p, R2ABT, R1CAN, IW2MXE, UA6HZ
See full Visitors and Frequenters lists on the Club 72 web page.
Comments:.....
See full version of the WQR Report on the blog page -http://qrp-club72.blogspot.ru/

72! Oleg RV3GM / KH6OB "Mr. 72"


This is a periodic Newsletter of the Club 72. Don't reply to Newsletter address! Send any requests or news to mr72@club72.su please.

Mr Trump - NOT amateur radio

A lot of people in the USA voted him into office. "Make America great again".

As yet, he has still to demonstrate true statesman-like behaviour on the world stage. Mrs Merkel was not impressed! He will be judged by how statesman-like he is. Sometimes he will have to eat his words. We have not yet had him in office 100 days, so it would be wrong to judge him too soon, although personally I have not been impressed.

Why does he remind me of a certain European leader who came to power in the 1930s and who committed suicide in 1945? Caveat emptor.