Vienna, April 2nd, 2010
Six months after bringing V53ARC online, the second WSPR beacon in Africa got into service. 5X7JD went online today. The beacon is hosted by Jack, 5X7JD who is located in Masaka, Uganda.
Jack Dunigan, a US citizen, is permanently located in Uganda working for AIDCHILD, an organization with homes, clinics, and academies for orphans who are abandoned and living with AIDS. Visit www.aidchild.org, donations are very welcome.
Same as the Namibia system, the beacon was developed and funded by Gernot Frauscher, OE1IFM. Visit www.oe1ifm.at to find out more about the beacon project. The system has 1W output and cycles through 80,40,30,20,17,15,12 and 10m, so one can hear the WSPR signal returning every 16 minutes. Antenna is an HyGain Av 18VS multi-band vertical. The beacon hardware is an embedded system based on a PIC 18F2455 MCU, an Analog AD9851 DDS chip and a MOSFET PA with selectable filters. Time and location information are derived from an attached GPS receiver. This beacons will be available as a kit soon and we are looking for hosts in interesting locations.
Spent the morning setting up G5RV Jr wire antenna with my friends and tried WSPR 2.0. Received some false results on 30m:
0616 -21 3.2 10.140127 0 <...> JZZ8XZ 22
0630 -22 0.6 10.140131 0 <...> JZZ8XZ 22
Not too bad for the first try at all, I'll again later.
This evening I did use 27dBm, not 37 dBm. It was a mistake. I transmit with 500mW but the setting in the software was wrong.
G7LHS decoded my 50 uW-signal on 30 m over a distance of 1023 km - congrats! My equipment: FT-817, 500 mW into 40 dB-attenuator, lazy four-corner loop, twinlead-fed, 60 m per. , 8 m up. Amazing!
2010-03-26 08:02 DL9NEF 10.140295 -27 0 JN59ns 0.001 G7LHS IO83ri 1023 298
Today was quite a bit of fun. Having run WSPR yesterday, and leaving it at 500mW (via FT-817ND menu), I decided to try to reduce the power output by reducing audio drive. It worked (a no brainer). Interestingly enough, 15m was open to the US using 500, 200 and 100mW. When I dropped the audio to produce 50mW, the output was there, but I think I left it a bit late in the day. Will try again tomorrow to see IF I can cross the Atlantic on 50mW. That's about as low as I really can go using the current ATU power meter... fingers crossed. 73 to all, and of course, good DX.
My location really is EN61bn not EN62. (Whatta jerk. I don't live on a boat, moored off Wisconsin's shore in lake Michigan.)
Update: I found out how to edit account info and did so. However the location shown on my posts hasn't changed. Does something need to be recycled? flushed? reinitialized? By me? By someone else?
Attempted access to WSPRnet timed out. What is the problem???
The graphical display of WSPR shows the short path from stations in Europe to Australia in the morning (at 7 a.m. UTC) for the 30 m band. However, I am convinced that these contacts were transmitted via the long path. The error in the graphical display and the distance error of the data base of WSPR should be corrected.
Best dx 73 Mike DL1MMK
This line in the database makes my heart a little jump :-)
Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
2010-03-16 15:50 DG9VH 7.040100 -21 0 JN39kf 5 VK7FGMH QE37na 16911 92
All with just 5 watts on 20 mtrs. wire under the house-top!
fantastic, what could be done with such a setup!
WSPRnet opens up the possibility to measure the efficiency of my magnetic loop antenna (I3VHF, Baby, 1m diameter, direction 330 degrees), which stands on a balcony. Radiation in west direction (up to the zenith) is unobstructed in contrast to the east, south and north direction, where the antenna is near (1-2m) iron concrete walls with a hight of 10m. I compared the reception reports of my station (DL1MMK) with DG7RJ (distance 20 km), who uses a homemade Dipole 2*9m at 7.5m heights in SW/NE direction.
For the 30 m band:
Transmitting efficiency: In west direction (long path) the report by VK7ZL (23457 km) is 6,5db better for DG7RJ as compared to DL1MMK.
In west direction the report by W3HH (7930 km) is 5 db better for DG7RJ as compared to DL1MMK. Theoretical efficiency is -2,5 db.
In south east direction (4Z4TJ) DL1MMK is received with -18 db as compared to DG7RJ.
In north east east direction (RK3IK) this difference is - 15 db.
Receiving efficiency: Interestingly DL1MMK receives W3HH with the same signal to noise ratio as DG7RJ.
For the 40 m band:
Here the theoretical efficiency of the magnetic antenna is reduced -6db. Consistently K1JT receives DL1MMK (transmitting west) now 12 db worse than DL1MMK receives K1JT (see attachement).
Certainly the magnetic antenna could work much better if it would stand on the top of the roof, with unobstructed radiation in all direction. However the excellent reception of WSPR signals even under such impaired conditions opens up possibilities for SWL.
Best DX 73 DL1MMK Mike
Hi all. Phase 8 was completed sucessfully yesterday evening. Hope to find the time to continue with the rest this week. So far no big issues except some human failure ... hihi. I ordered a nice aluminium case for the kit and also a E-MU0202 soundcard.
Have a good start in the new week!
73s from JO61ei, Gregor DM1RG
Let's see what's happening...
I've taken over the living room table, set up the FT-817 and run the feeder out to my portable dipole in the garden.
It is all working! K9OHI, AC2C, IQ4DJ on 30m.
Clever things these computers.
I coded a little tool to copy WSPRnet Database Spots into DX-Atlas World-Map
with splitting TX and RX Spots of your Call.
You can toggle between TX and RX Spots at the World-Map to interpret something …
73 de Schalli, DC5BN
Now WsPr_Atlas4.exe works also with Microsoft "Internet Explorer 8"
Now WsPr_Atlas5.exe has CheckBox "Always On Top"
Now WsPr_Atlas6.exe released with some fixes"
I completed the phase 5 of my G3020 kit. Hopefully I find so much time to build the next days as I did last week to get on the air with the G3020 soon. I would be interested to get some information fromt he ones of you that use G3020 og G40 which soundcard you use and which SDR software you prefer.
Thanks for your comments.
73 de DM1RG Gregor
Please go to http://w0yse.webs.com/antennas.htm to see my antennas, picture and access to the other pages of my website.
Finding this new (to me) part of the hobby VERY interesting.. Amazing who and what time of the day you can be heard around the globe!!
I think that this will really help ( or inspire) me to understand propogation more.
Hi. Just finished phase 2 sucessfully. All 4 oscillators are working. Now I will have a cup of coffee and then continue with phase 3, the switch board.
Have a nice day all, I am on air at 30m.
Hi all. My G3020 kit arrived today at JO61ei. Parts inventory is completed and also Phase one. The power supply is running and I got a green LED lighening at the end. So thats almost a good end of the day. Tomorrow I will have a day off so the solder iron will smoke all over the day.
Have a nice evening all.
Cheers, Gregor DM1RG