Use the spectrum analyser to peform a site survey using the newly constructed antenna

davidkirwan / software_defined_radio_telescope

A cheap software defined radio telescope based on the NASA RadioJove design. Suitable for picking up decametric (10 - 100m wavelength) radio emissions from storms on Jupiter

GNU General Public License v2.0

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Use the spectrum analyser to peform a site survey using the newly constructed antenna #5

Closed davidkirwan closed 9 years ago

davidkirwan commented 9 years ago

With the help of the spectrum analyser, find a suitable radio quiet site for the radio telescope antenna

davidkirwan commented 9 years ago

Blocked by #3

jpronans commented 9 years ago

Also blocked by the fact that I have it at home. This is the fella. http://www.tek.com/datasheet/h600-sa2600-series.

You are probably better off to select a few sites, and then see what they are like RF wise. The important thing is a general/overall low noise floor and not some mad electrical noise on site.

davidkirwan commented 9 years ago

5MHz - 25MHz on the spectrum analyser while connected to the 20.1 MHz dipole antenna.

jpronans commented 9 years ago

Interesting, but also it looks very noisy for some reason.

I'd say pick a smaller chunk of spectrum and compare against the Hack RF.

As an example.. on my 15M/21Mhz dipole here on the roof, I have no signals over -120dBm. you have nothing that low... :(

John

On 24/03/15 22:55, David Kirwan wrote:

26 https://cloud.githubusercontent.com/assets/1700165/6814345/afa77c94-d275-11e4-85ff-f56f74d87ab3.png 5MHz - 25MHz on the spectrum analyser while connected to the 20.1 MHz dipole antenna.

— Reply to this email directly or view it on GitHub https://github.com/davidkirwan/software_defined_radio_telescope/issues/5#issuecomment-85726718.

davidkirwan commented 9 years ago

Just to let you know this antenna was about 4ft off the ground, still have to get the mounting poles up to this site :]

davidkirwan commented 9 years ago

Single dipole mounted NS configuration at 15ft with the HackRF One. 20MHz bandwidth (12.5MHz - 32.5MHz)

I can't compare using the Spectrum Analyser now as I no longer have the right adapter to connect the Analyser to the antenna.. The adapter went back with the SWR meter. Doh!

davidkirwan commented 9 years ago

I'm finding the HackRF One is not that great for RX work, either that or I really need a preamplifier like this perhaps: http://www.g4ddk.com/PGA103+2.pdf