Having always troubles with long wires, I decided to test a magnetic loop. Therefor I soldered a square 128cmx128cm, with 12mm copper pipes, organized a variable capacitor via ebay and but this construction on the kitchen table.
It is amazing - I got a spot from WB2EEE over a distance of > 6000 km, -28 dB, for my 10 watts, inside the building at the 1st floor.
Test showed me, that I can use it on 30m and 20m too. Let's see what will happen later this night on 40m. Tomorrow at daytime I will test on 30m and 20m with the antenna at the balcony.
Here the link to my web-site: http://www.msteiner.at/index.php/amateur-radio
We're starting to see a few short Es openings here in Europe, so I'm proposing to start running WSPR on 50MHz in the next few days. Would be great to see plenty of people on 50Mhz WSPR too.
See you on 50.293?
VI100ACT special stn CQ on 24.2225 in Olivia 8/125. Will be QRV till 1000 UTC today (6 MAR 2013)
Unfortunately this callsign is unsuitable for WSPR, being mutilated when transmitting. I will therefore no longer use it in this mode. I will endeavour to come up in Olivia or ROS for weak signal QSOs. Will update the blog whenever I start.
Some info on the Rx audio output in combination with the Yaesu FT 857, I had to turn the RX complete open for RX nose +/- 0 db.
Yesterday I upgraded the WSPR software from 2.00 to 2.11 and got it fixed. The RX is now half open and the signal is 2/4 db, great!!
This is a special callsign commemorating 100 years of Canberra/ I will be using this call until March 9 2013 on 12m digital modes, WSPR included. QSLs and SWL reports via the buro. A special QSL card is yet to be printed.
experience in wspr with yaesu ft817nd-antenna:dble conrad windom 3 combinated attenuator 3 - 6 - 9 dB
2013-03-01 00:04 F1RXM 3.594152 -23 0 JN05du 0.006 DK4XI JN39qe 648 53
2013-03-01 00:04 F1RXM 3.594164 -26 0 JN05du 0.006 PA0O JO33hg 942 27
2013-02-28 23:34 F1RXM 3.594160 -22 0 JN05du 0.012 OZ7IT JO65df 1340 35
2013-02-28 23:02 F1RXM 3.594159 -14 0 JN05du 0.125 OZ7IT JO65df 1340 35
2013-02-28 22:42 F1RXM 7.040053 -22 0 JN05du 0.025 LA9JO JP99gb 2776 15
2013-02-28 21:52 F1RXM 10.140156 -25 0 JN05du 0.250 W3HH EL89vb 7190 286
see att here:
mny thanks all and see you on wspr
jean-pierre on qrz.com
Got my USB SignaLink by post today and had it running in 30 minutes. (just two cables, and jumper settings). First to check the audio levels i used Digipan, then i went to WSPR.
My condition is 5 Watts on a indoor dipole. The Rig is a FT 897. After some 20 minutes i got a report from VU2LID..nice :-))
In the next days i will be testing on 20, 10, 6 and 2 m
Im always in for QSL, via bureau
73 Roy PA9R
2013-03-02 07:56 DD5CF 14.097126 -20 -1 JO30nq 0.01 LA9JO JP99gb 2132 12
2013-03-02 08:26 DD5CF 14.097047 -16 -1 JO30nq 0.01 OH5CW KP30gt 1645 39
2013-03-02 08:34 DD5CF 14.097047 -8 -1 JO30nq 0.01 OH5CW KP30gt 1645 39
2013-03-02 08:44 DD5CF 14.097045 -10 -1 JO30nq 0.01 OH5CW KP30gt 1645 39
2013-03-02 08:44 DD5CF 14.096962 -8 0 JO30nq 0.01 LA5ZL JO28uu 913 355
I am running the Softrock RXTX Ensemble with the power output reduced with the Windows XP volume output control and tested with the QRPometer kit from the Four State QRP Group, the Microvert ant is on top of our roof about 10m high.
Vy 72 Colin DD5CF / G1ZOS
I was amazed yesterday, had left the WSPR tranny running all day, did a check about midday and saw I was only getting spotted by a few stations all in a straight line out towards Finland and at a 1000 miles, later I noticed that the Patch lead that feeds the WSPR Tranny was not plugged into the ATU, I had changed Trannys the day before. That cannot be too bad transmitting off a 40 cm patch lead a 1000 miles, though I guess the signals was being inducted into the Co-ax screen of the other Antenna leads in the shack.
There is a spirited discussion on the Softrocks forum concerning the legality of WSPR transmissions under FCC rules. In this discussion one person has complained about "high power, continuous WSPR transmissions", especially on 40 meters. Out of curiosity I took a look at recent database postings and it does seem that there is a great deal more power being used than is necessary in some cases.
There is one guy running 1000 watts! 7 running 50, 9 running 20.... etc. There is simply no need for such power levels on HF WSPR.
I would like to suggest creation of the WSPR Hall of Shame. Entry criteria should be:
1) Power levels of +37 dBm or higher
....... AND ........
2) Average SNR on your spots of -12 dB or higher
In addition, much of the concern mentioned in the forum is in regard to the high number of 40 meter, crystal bound QRP CW rigs out there who interfere and are interfered with by the lower end of the 40 meter WSPR band. As I have one of these rigs myself I think there may be some validity to this complaint.
Warren Allgyer - W8TOD
some info about my radio systems ...
Radio 1: ts 570 kenwood 5 w. power is more 'low fd4 windom antenna placed east-west
Radio 2: kenwood ts 2000 5 w, fd4 modified (double length) arranged north to south.
I saw with pleasure that I have heard in VK and HC.
continue with the test. good radio to all
I set up the website today where you can see what my WSPR station is heard. Now, overnight, it's 80m band is active. The image up dated two minutes periods. Will test the system the next 24 hours and see if it works properly. Here is the web address if you want to look into: http://kotisivu.dnainternet.net/heipisil/wspr/wspr.htm
Running my WSPR-station with the following toys:
FLEX-1500 doing about 2 w. A Great little rig for digimodes.
Dipole for 30 meters, placed under roof of my house (5 meters above ground)
Software setup in Windows 7:
With VAC ( Virtual Audio Channels) and CAT/PTT-control i hook up the PowerSDR-software to the WSPR-software (ver 2.11).
For the CAT-control I use virtual COM-ports with com0com-driversoftware.
One com-portpair is used for CAT and one pair for PTT. Use low numbers (less then COM11), Seems to not to work with high numbers.
The rig definition used for CAT is TS50 (Tried TS480, but did not work)
Tha audio channels are also feeding the ARGO-software to report QRSS-traffic (RX only) for a QRSS-grabber.
I used last night Flex 1K5 / VAC/ WSPR-15 and my 80m's 1/4 wavelength GP to 160m Any thing works very well, but small negative sign for the 160m swr is 1.2:1 so I get no more than 4W out. I was surprised to wspr-15 works so well. I have long been waiting for something new to wspr software, and now it has happened. Now they have as well as more control over the software than previous versions and you can see better what happens when you make adjustments to the rx thanks for the new waterfalls, however, programs spirits of new features as well! Now it's fun to use wspr again!
Thanks for the great software!
I wish to all users wspr, swr's 1:1 and 73 Heikki/oh8gkp...
Enjoying wspr, colin m1eak - thanks for the headsup and help !
2013-01-25 22:22 ON4EZ 3.594064 -8 0 JO21bd +0 0.001 F5OIH JN06ci 605 376
2013-01-31 15:10 AC4CX 14.097014 -25 0 EL98iq +3 0.002 F5OIH JN06ci 7127 4429
2013-02-06 06:58 WB2WDC 10.140202 -22 0 FN13fc +3 0.002 F5OIH JN06ci 5897 3664
2013-01-05 09:32 KB6BZZ 7.040094 -19 0 DM14jl +7 0.005 F5OIH JN06ci 9063 5631
2013-01-09 22:52 G3ZJO 0.475695 -29 1 IO92ng +7 0.005 F5OIH JN06ci 663 412
2013-01-07 08:12 ZL3FV 14.097077 -7 0 RE57lg +7 0.005 F5OIH JN06ci 19179 11917
ANT: PA0RDT Mini Whip active antenna
73 de Vincent F5OIH
I use Glenn's, KI6GD's, excellent "Magnetic Loop Calculator" (I have v1.4, 2009) to help in the design and experimentation with small loops. For 20m, here are the numbers (the program works with either Imperial or Metric units and various materials and shapes (copper, aluminum and shapes round, square and octagon) all which will affect the final product. Note: According to my ARRL Handbook, Belden RG-213 has a rated breakdown voltage of 3.7kV (RMS) and at the 50 watts operating power level the capacitor voltage is 3.3kV. That's cutting the safety margin close, so I wouldn't push the loop past 50 watts and most my operating is 25 watts and way less. But, just how good is any of that cheap, no-brand "Made in China" coax, eh?
Efficiency is around 53% for 20m which seems to work since I can work DX and they can work me! When used on 30m it's just over 26% according to the calculator and I've only been able to work Canada/U.S. stations, mostly. A larger loop would be a better choice for 30m to increase the efficiency.
Loop Circumference 3.03 m (10' loop circumference, circular shape)
Conductor Diameter 12.7 mm (1/2")
Frequency 14.097 MHz
Power 50.00 watts (for maximum capacitor voltage calculation)
Bandwidth 16.9 kHz
Capacitor Value 33.5 pF
Capacitor Voltage 3.3 kV
Conductor Wavelength 0.151 lamda
Efficiency 53.1 % (circular is the most efficient, followed by octagon at 50.4% , then square at 41.1%)
Inductance 2.995 µH
Inductive Reactance 265.4 ohms
Loop Area 0.7 m² (8.0 feet²)
Loop Diameter 1.0 m (3.2')
Loop Q Value 832.4 Qres (outrageously high Q value at resonance, thus a narrow bandwidth but less noise with the signal)
Radiation Resistance 0.085 ohms
Resistance Loss 0.075 ohms
A few years ago, I wrote a couple of articles on modifying and using WA8LMF's 30m magnetic loop design. I've re-edited and put them on my website. If anyone is interested, you can download the ZIP file from here: http://tinyurl.com/cevk44m.
This is the copper tubing magnetic loop that I'm testing outside. Since it has a stand, it's easier to set or move around and move stable in wind over the MFJ-933 tuner/wire loop. The 12.5mm (1/2") diameter copper tubing is wrapped in high-voltage rubber tape (60 kV) just in case someone were to touch the loop when it was transmitting! The copper look is 3.03m (10') and in inner, inductively coupled drive loop is 0.606m (2').
Tuning for 30m to 10m is via RG-213 coax stubs (outer jacket and braid removed). I used a Marette connector (wire nut to non-Canadian) threaded into one end of the copper tubing so the stubs can be changed. They just slide into the other end of the tubing and I use an MFJ antenna analyzer to adjust the resonant frequency by adjusting how far the stub slides into the tubing. Since small loops are very shape in tuning, it's often just by millimetres!
The basic design for the loop came from Stephen, WA8LMF, http://wa8lmf.net/ham/30m-magloop-ant.htm, and I made slight changes so it would work multi-band with stubs you can swap in and out. The loop works very well from my WSPR tests. Even at 500mW and 50 percent loop efficiency (20m and 90 percent for 10m), I'm hearing European stations and they are hearing me. At the 200mW level I'm only heard on this side of the Pond. Still remarkable because compared to my outdoor wire antenna 50m Delta loop, the small magnetic loop is producing the same WSPR tx/rx pattern! So, small loops can and do work, if properly designed.
As it's sitting so low to the ground, the loop's orientation doesn't matter as it seems to be omni directional. In the picture, east/west is broadside to the loop. The yellow, collapsible work stand came from an outdoor halogen light stand. The legs can go flat against the ground and a sandbag or some other weight can be used to hold it down in the wind.