KICAD

 Ubuntu ppa Adam Wolf

Schematic converter (gEDA -> KiCAD etc) - needs freetype ( pip install freetype-py and apt-get install freetype*)

viterbi decoder: git clone https://github.com/Opendigitalradio/ka9q-fec.git

Gnuradio installation:  http://gnuradio.org/redmine/projects/gnuradio/wiki/PyBOMBS/8

GNSS library http://docs.swift-nav.com/libswiftnav/install.html

 

DIY

Alternartor fix

EGNOS data reference

To get the data as it was transmited, download it from ESA PAGE

If you need a day of the year, so THIS site helps. Filter the data column (change filenames) :  cat 20sep14-10-50-31-ESA.txt | awk '{ print $9 } ' | sed ':a;N;$!ba;s/\n//g' > plain-2014-sept-20-105031.txt

On 17.th of May 2014, we started activity to get the signals from the GPS geostationary references, that could be used for a continent wide time synchronization of SIDI receivers. Calculations show, that simple antena (eg 1m dish or 50cm long helix) should have enough gain to have a good S/N ratio. We started with the famous "flak mount" upgrade, i had 2 heidenhain 15 bit absolute encoders that i got in Friedrichshafen for few German Marks many years ago lying somewhere.

15 bit HEIDENHAIN absolute encoder AZIMUTH reading

I managed to find specs and wrote the decoding and display software for ATMEGA 8. With those precize and alligned position encoders, finding sky sources was immediately like a charm. For the elevation we simply calculated degrees/tooth on the elevation wheel, precision upto 0,25 deg is easily acheived. Adjustments of the base stand to get the mount to perfect horizontal position helped a lot to be in within 1 degree accuracy.

  Setup for the measurement cosisted of 3 different antennas

3m dish, vertical polarization 30 db S/N 3m dish
1m dish, circular feed 10 db S/N feed
37 cm long helix 12 db s/N helix

 

Preamp is s53mv about 0.6dB NF, 50m of 75 ohm cable and another preamp to cover the cable losses, total gain abt 30dB. For measurement we used my home made S53MV spectrum analyzer.
Signal at 3m dish was as expected 30db above noise.

SES-5 signal on 1575

 

satellite comment position azimuth elevation
Inmarsat-3 AOR-E, at    15.5° W 218.4  30
 SES-5 (also Astra 4B and Sirius 5) Best signal, next day no signal.. not reliable 5 192.5 36.7
 ARTEMIS  no signal on 1575 21.5 169.56 36.92
 Inmarsat 4-F2 (Europe Middle East Africa) (weak signal . 15db, rightmost maximum) 25 164.79 36.32
 Astra 5B [2] no signal on 1575 31.5 156.20 34.66

 

With the 3m dish the SES-5 signal was about 30dB. We tested also 80 cm dish and 50cm Helix,

helix antenna for GNSS

that gave about 10dB signal, prommissing result. The dish feed was used for pointing only. 

Following picture shows fft SIDI output with east (helix) antenna in upper and west (3m dish) in lower part.

5E dual view recording

Next picture shows same east setup with W antenna pointed to the satellite at 15.5°West

east SAS-5 and west ant to 15.5W

Marko recorded the data on sidi an will try to crunch the numbers.

Common noise source to 2 SIDI RX each own LO and EGNOS reference

 

Questions, comments?

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 Nastavitev eclippse okolja v projektu:

1. default port:
nastavimo v avrdude
gedit /etc/avrdude.conf
default_parallel   = "/dev/parport1";

sudo gedit /usr/share/arduino/hardware/arduino/programmers.txt

parallel.name=Parallel Programmer
parallel.protocol=pony-stk200
parallel.force=true

gedit ~/.arduino/preferences.txt
programmer=parallel
upload.using=parallel
#parallel.protocol=pony-stk200

Programiranje:

Serijski programator:

avrdude avrdude -p atmega8 -P /dev/ttyS0 -c ponyser -e -U flash:w:$(PROJECT).hex

Paralelni:
avrdude -p atmega8 -P /dev/parport1 -c stk200 -U flash:r:flash.bin:r
sudo avrdude -p atmega8 -P /dev/parport1 -c pony-stk200 -U flash:r:flash.bin:r

Če nimaš urejeno v okolju upload navedeš tmp fajl

avrdude -pm8 -cpony-stk200 -u -Uflash:w:/tmp/build535585411977045319.tmp/i2csniff.cpp.hex:a -Ulfuse:w:0xff:m -Uhfuse:w:0xc9:m

Test povezave, no write to device (-n):

pavelr@debeluscek:~/projeki/ParallelPortTest$ avrdude -p atmega8 -n -P/dev/parport2 -cpony-stk200
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e9307
avrdude: safemode: Fuses OK
avrdude done.  Thank you.

Ko nardiš projekt nastavi v properties/c/c++ build /settings/Additional tools GENERATE HEX file for flash

Da se po prevajanju naloži hex na napravo, moraš izbrati RELEASE configuration, sicer naredi samo elf

 

Usefull Libraryes

I2C, LCD, UART http://homepage.hispeed.ch/peterfleury/avr-software.html#libs

s57ra 5.7GHz EME dish

My dish - for 5.7GHz EME

In august 2001 i got 3 pcs of andrew 10ft dishes, which were used for telecom service on 7GHz. During the transport one of them was damaged but it will still be ok for 6cm and lower the others are ok for 3cm also. First i will use one of them (f/d=0.3) for 6cm EME, the support is the same that has been used for 70cm EME - the german Air gun base - mobile setup. At the back side of the picture you can see the damaged dish.

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antena2.jpg - 37227 Bytes
Rear view



 

S57RA in front of the dish with 5.7GHz ZIF radio in hand I also have made a MOON-CAMERA, with the old binocular lense the picture on the screen is about 3moon high and 4moon wide, a good compromise between acuracy and ability to find the moon. It is hard to beleive how small is it if you try to find it with an aperture of 1degree...for moire innstructions for building a moon-camera check: Moon tracking camera by S57UUU .
kamera.jpg - 25099 Bytes

And now look at the production year of my AZ/EL system. I must say, it is still working perfectly with great precision!
letnica.jpg - 22635 Bytes