ISS SSTV pirctures. Me, too.


ISS crew sends some nice SSTV pictures from outer space to earth.

As you can see quality isn't that good. I don't know if it is a problem with my antenna...


I hope next time to get better quality pictures ;).




Yesterday I compared WSRP with two different RX. The first was RTLSDR (E4000 as direktsampler) and YAESU FRG-100. Both on same antenna. 12m wire on 9:1 unun.

The result is not that much different as I expected. Have a look at this animation. It shows stations from within Europe on 30m band.

WPSR on 30m band

Even if the FRG-100 has bigger SNR (-70dB vs -50dB of RTL) WSPR gets not more stations.

Remeber: this is not a high end scientific research! Hower, it's interesting to see that WSPR is able to decode nearly same stations.


12m wire
9:1 ubunt
YAESU FRG-100 (on soundcard)


Raspberry Pi does NOAA APT


After a long peroid of time using Raspberry Pi as ADS-B decoder I found my good ole Emgo RX137 on the attic again.

I connected the RX to a 3$ chinese USB soundcard. Then I installed the latest beta of WXToImg on Raspian.

After testing the setup it finaly works fine.

Have a closer look at



My setup is Raspberry Pi B, Emgo RX137, USB soundcard, DIY QFH antenna.

Thanks to WXToImg team for transporting this fine software to ARM cpu.


waterfall.py by keenerd


T'day I'm trying waterfall.py by keenderd the first time. You can download the script from here: https://github.com/keenerd/rtlsdr-waterfall.

CLick to enlarge

If you start the script with python waterfall.py 935000000 960000000 for example you'll get a result like the one in the picture above. It's showing the GSM 900 band with hopping and non-hopping signals.


My newest antenna: Eggbeater II for 70cm ham radio satellite band


after visiting our local bulding center yesterday, I assembled the Eggbeater II antenna today.

Have a look at:

Click to enlarge
It's the 70cm version for ham radio satellites. I followed the tutorial written by ZR6AIC, Anton. You can find his tut here: http://zr6aic.blogspot.de/2013/03/building-my-eggbeater-ii-omni-leo.html

Click to enlarge. Red dots == doppler of satellites
As you can see there a few strong signals. I feel that this antenna is the best one I ever build for 70cm satellites. But let me check this out the upcomming days...

I just made a short movie that shows the performance of the antenna:


"Yes sir, there are a lot of them in outter space."


since a few days I'm tracking the 70cm ham sat band from 435 to 438 MHz. An yes: they're still alive. :)

Every red dot marks a doppler of a satellite.

Click to enlarge.

Now I've to identify the calls of the satellites.


Found a few pictures of airplane and garves radar doppler - a short movie


I found a few pictures of airplane and garves radar doppler I did with HDSDR, speclab and rtlsdr on my old harddisk . I made a short movie out of a bunch of jpegs.

Have a look at:

This movie shows doppler of airplanes on AM atis transmitters or meteors reflected by graves radar france. Don't look at the box in the left corner. It has wrong frequency values and many typos. 


Doppler experiments


inspired by OM DJ0MY (thanks!) I tried to get some nice doppler signals. I tuned to Graves radar on 143.050 MHz and Hamburg ATIS on 123.125 MHz.

With my "new" diy lindenblaad type antenna (new == 1,5 years old ;) ) for 70cm I caught a few nice doppler signals.

Let's go :) .

Doppler by planes on Hamburg ATIS frequency. The transmitter should be about 120km away.

Frequency drift of RTLSDR, maybe.

Distance between QTH and Hamburg ATIS transmitter.

Doppler by ISS on Graves radar frequency 143.050MHz. See pulse/pulse break on ISS. ISS was about 1000km away - or more...

Pulse break from Graves radar on ISS.

Pulse length from Graves radar on ISS.


Latest wx ballon heatmap


last night I did a new heatmap with RTL_POWER. The frequency range is 404MHz to 406MHz. Intervall 30 seconds and binsize is 2000Hz.

I wanted to know which wx balloon signals are available at my place.

This is the result of 13,5 hours recording.

I caught seven balloons on five different frequencies in wx balloon band. Next time I will try to decode them with Sondemonitor by COAA.


Reflections of Graves radar, Dijon, France


Yesterday a well known OM told me about Graves radar located near Dijon in Framce. It's waves are transmitted on 143.050 MHz.

If you tune your rx on this frequency and watch the FFT with HDSDR for e.g. you can see reflections of these waves on objects that are flying in the air above.

There objects could be planes, asteroids, meteroids, ISS and other things in heaven above.

Have a look at this video, please. You can see a few of these reflections. Some a small, some are bigger. The duration of the recording is about 34 minutes.

The distance between my ocation and the Graves radar is about 680km.