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@ -28,12 +28,12 @@ This should work in a classroom provided there isn't too much background noise,
- Raspberry Pi 2B or later, with the usual peripherals. - Raspberry Pi 2B or later, with the usual peripherals.
- RTL-SDR USB dongle (search RTL2832U). - RTL-SDR USB dongle (search RTL2832U).
- Don't buy the little 30 cm mag-mount antennas. You will have little or no hope of picking up the ISS with them. - Don't buy the little 30 cm mag-mount antennas. You will have little or no hope of picking up the ISS with them.
- [This RTL-SDR starter kit](https://www.amazon.com/RTL-SDR-Blog-RTL2832U-Software-Telescopic/dp/B011HVUEME/) is recommended and comes with a good beginners dipole antenna that will pick up the ISS. - [This RTL-SDR starter kit](https://www.amazon.com/RTL-SDR-Blog-RTL2832U-Software-Telescopic/dp/B011HVUEME/) is good and comes with a nice beginners dipole antenna that will pick up the ISS.
## Initial setup and test ## Initial setup and test
1. A guide for setting up your Raspberry Pi can be found [here](https://projects.raspberrypi.org/en/projects/raspberry-pi-setting-up). 1. A guide for setting up your Raspberry Pi can be found [here](https://projects.raspberrypi.org/en/projects/raspberry-pi-setting-up).
1. We presume you are running Rasbian Stretch Desktop edition available [here](https://www.raspberrypi.org/downloads/) 1. We presume you are running Rasbian Stretch Desktop edition available [here](https://www.raspberrypi.org/downloads/).
1. Install prerequisites. 1. Install prerequisites.
- Start > Accessories > Terminal - Start > Accessories > Terminal
``` ```
@ -140,7 +140,8 @@ This should work in a classroom provided there isn't too much background noise,
- Signals = `Normal` - Signals = `Normal`
- Mode = `Auto` - Mode = `Auto`
- Click play `►` button. Nothing will happen, but just click it to start the receiver. - Click play `►` button. Nothing will happen, but just click it to start the receiver.
- Open `sstv_test.mp3` in Chromium browser. Let it play. Note that with VLC Media Player you get a skewed image sometimes. - Open `sstv_test.mp3` in the Chromium browser. You can either drag and drop the file from File Manager or just enter `file:///home/pi/sstv_test.mp3` into the address bar.
- Let it play. Note that with VLC Media Player you get a skewed image sometimes.
![image](qsstv_decode.png) ![image](qsstv_decode.png)
@ -171,11 +172,11 @@ This should work in a classroom provided there isn't too much background noise,
- The usual SSTV frequency is 145.8 MHz. - The usual SSTV frequency is 145.8 MHz.
1. Try to get your antenna up as high as possible with a good view of the sky in all directions. 1. Try to get your antenna up as high as possible with a good view of the sky in all directions.
1. If you are using the RTL-SDR kit antenna, please read the getting started [guide](https://www.rtl-sdr.com/using-our-new-dipole-antenna-kit/) for it. 1. If you are using the RTL-SDR kit antenna, please read the getting started [guide](https://www.rtl-sdr.com/using-our-new-dipole-antenna-kit/) for it.
1. It's important to adjust the length of the telescopic sections based on this dipole [calculator](http://www.csgnetwork.com/antennaedcalc.html). 1. It's a good idea to adjust the length of the telescopic sections based on this dipole [calculator](http://www.csgnetwork.com/antennaedcalc.html) to match the antenna's resonant frequency to 145.8 MHz. This will help pick up weaker signals from low elevation passes.
- Under `Desired Frequency` enter `145.8` - Under `Desired Frequency` enter `145.8`
- Under `Select Antenna Calculation` select `One Side` - Under `Select Antenna Calculation` select `One Side`
- Click `Calculate` - Click `Calculate`
- Remember that there is about 2 cm of metal in each side of the antenna itself. So take the calculated value and make both sides this length minus 2 cm (excluding the screw threads). - Remember there is about 2 cm of metal in each side of the antenna base. So take the calculated value and, before screwing the telescopic sections in, make them both this length minus 2 cm (excluding the screw threads).
1. Set the correct time on the Raspberry Pi. QSSTV saves the images with a UTC time filename and this is useful later when working out which ISS passes they are from. 1. Set the correct time on the Raspberry Pi. QSSTV saves the images with a UTC time filename and this is useful later when working out which ISS passes they are from.
- Start > Accessories > Terminal - Start > Accessories > Terminal
``` ```