20131215

Doppler experiments

Hi,

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.




20131210

Latest wx ballon heatmap

Hi,

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.


20131201

Reflections of Graves radar, Dijon, France

Hi.

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.