Mount Dandenong Spectrograms 
Friday, June 10, 2016, 10:28 AM
Posted by Administrator
Using an RTL-SDR dongle and the RTLSDR Scanner python code I am able to generate Frequency Spectrograms.

Here is a spectrogram of the 70 cm amateur radio band. The VK3RTV repeater on Mount Dandenong may be seen on the right hand side centered at 446.5 MHz.

Here is a spectrogram of the FM radio band from my TV antenna pointing towards Mount Dandenong.

Here is a spectrogram of the VHF Digital TV band from Mount Dandenong. Shown are the 7MHz wide transmissions of the Seven, SBS, Nine, Ten and ABC services. Also shown are the 3 DAB+ radio transmissions too. The gap between Nine and DAB+ is the former analog service. The gap between DAB+ and TEN is the former analog service.

For further details about my Amateur Radio interests see my web site at

view entry ( 2766 views )   |  permalink
Two Years of Hourly Temperatures 
Tuesday, January 26, 2016, 07:17 AM
Posted by Administrator
I have been collecting hourly temperature readings at my apartment for over 2 years now.

I have a sensor on the east side of the apartment and another sensor on the west side of the apartment.

I have graphed 2 years of recorded temperatures.

view entry ( 2915 views )   |  permalink
Floor mounted ADS-B collinear antenna upgrade 
Tuesday, January 19, 2016, 08:15 AM
Posted by Administrator
I purchased a new PVC pipe, a tee joint and two caps from Bunnings.

After adding additional 114mm sections to my antenna I now have it floor mounted and extending up 7 feet to the ceiling.

No longer need to be concerned about using tape or getting a mounting for the antenna.

I have added logos to the pipe.

See updated details at the bottom of my dump1090 page:
view entry ( 1846 views )   |  permalink
ADS-B collinear antenna to receive overhead aircraft 
Friday, January 15, 2016, 01:08 AM
Posted by Administrator
I built a collinear antenna using co-axial cable to receive overhead aircraft using a RTL-SDR dongle and a Raspberry Pi 2.


I followed the instructions in a video posted to

view entry ( 1792 views )   |  permalink
RTLSDR Scanner Satellite Dish Examination 
Wednesday, January 13, 2016, 10:55 AM
Posted by Administrator
I have connected my satellite dish to RTL-SDR dongles on my Ubuntu Linux ASUS Nettop PC.

Using the RTLSDR Scanner application I have graphed Frequency Spectrograms of the Optus D2 Ku band, Optus D1 Ku band and Intelsat 19 Ku band.

Details may be found on my ham radio website
view entry ( 1866 views )   |  permalink

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Next> Last>>