Saturday, August 27, 2016

SDR Comparison

SDR Comparison

Name TypeFrequency rangeBand withChannelHost InterfaceWindowsLinuxMacEstimated price
AirSpy
Pre-build
24-1750 MHz
20 MSPS MSps ADC sampling, up to 80 MSPS 
1
USB
Yes
Yes
Yes using ports
US$199
SDRstick UDPSDR-HF1
Pre-built
0.1–30 MHz
80 Msps
1
1G Ethernet via BeMicroCV-A9
Yes
Yes
Yes
US$169
Apache Labs ANAN-10E
Pre-built
10 kHz – 55 MHz
122.88 Msps (14 bit ADC)
2
Gigabit Ethernet
Yes
Yes
Yes
US$995
Apache Labs ANAN-10/100
Pre-built
10 kHz – 55 MHz
122.88 Msps (16 bit ADC)
4
Gigabit Ethernet
Yes
Yes
Yes
US$1,649-US$2,449
Apache Labs ANAN-100D/200D
Pre-built
10 kHz – 55 MHz
122.88 Msps (16 bit ADC)
7
Gigabit Ethernet
Yes
Yes
Yes
US$3,299-US$3,999
SunSDR2
Pre-built
10 kHz – 160 MHz
160 MSPS
3/4
10/100 Ethernet, WLAN (embedded)
Yes
Yes
 ?
US$1,960
bladeRF
Pre-built
300 MHz - 3.8 GHz
80 kSPS - 40 MSPS
RX/TX (12-bit ADC/DAC)
 ?
USB 3.0 SuperSpeed
Yes
Yes
Yes
US$420
FLEX-6700
Pre-built
0.01–73, 135-165 MHz
245.76 MSPS (transceiver)
8/8
Ethernet
Yes
Yes
Yes
US$7,499
FLEX-6700R
Pre-built
0.01–73, 135-165 MHz
245.76 MSPS (receiver)
8/8
Ethernet
Yes
Yes
Yes
US$6,399
FLEX-6500
Pre-built
0.01–73 MHz
245.76 MSPS (transceiver)
4/4
Ethernet
Yes
Yes
Yes
US$4,299
FLEX-6300
Pre-built
0.01–54 MHz
122.88 MSPS (transceiver)
2/2
Ethernet
Yes
Yes
Yes
US$2,499
FLEX-5000A
Pre-built
0.01–65 MHz
48, 96, 192 kHz (transceiver)
2/2
1394a Firewire
Yes
No
No
US$2,800
FLEX-3000
Pre-built
0.01–65 MHz
48, 96 kHz (transceiver)
1/1
1394a Firewire
Yes
No
No
US$1,700
FLEX-1500
Pre-built
0.01–54 MHz
48 kHz (transceiver)
1/1
USB
Yes
No
No
US$650
Perseus
Pre-built
10 kHz – 40 MHz (87.5–108 MHz using FM down-converter)
80 MSPS
 ?
USB
Yes
Yes
 ?
US$1,199
SDRplay: Radio Spectrum Processor
Pre-built
0.1–2,000 MHz
0.5-12 MS/s and up to 8 MHz bandwidth
0/1
USB
Yes
Yes
Yes
US$149
ISDB-T 2035/2037
Pre-built
50–960 MHz
0.5-12 MS/s and up to 8 MHz bandwidth
0/1
USB
Yes
Yes
Yes
US$25
Soft66AD / Soft66ADD / Soft66LC4 / Soft66RTL
Pre-built
0.5–70 MHz
External ADC required (I/Q output)
0/1
USB
Yes
Unofficially
 ?
US$20
FUNcube Dongle
Pre-built
64–1700 MHz
96 kHz
0/1
USB
Yes
Yes
Yes
US$160
FUNcube Dongle Pro+
Pre-built
0.15–240 MHz, 420-1900 MHz
192 kHz
0/1
USB
Yes
Yes
Yes
US$200
FiFi-SDR
Pre-built
200 kHz – 30 MHz
96 kHz (integrated soundcard)
0/1
USB
Yes
Yes
 ?
€120
SDR-IQ
PnP
0.1 kHz – 30 MHz
66.666 MHz
1/1 ?
USB
Yes
Yes
Yes
US$525
WinRadio WR-G31DCC
Pre-built
9 kHz – 50 MHz
100 MSPS
3/3
USB
Yes
No
No
US$950
USRP B200
Pre-built
70 MHz to 6 GHz
56 Msps
 ?
USB 3.0
Yes
Yes
Yes
US$675
USRP B210
Pre-built
70 MHz to 6 GHz
56 Msps
 ?
USB 3.0
Yes
Yes
Yes
US$1,100
USRP N200
Pre-built
DC to 6 GHz
25 Msps for 16-bit samples; 50 Msps for 8-bit samples
 ?
Gigabit Ethernet
Yes
Yes
Yes
US$1,515
USRP N210
Pre-built
DC to 6 GHz
25 Msps for 16-bit samples; 50 Msps for 8-bit samples
 ?
Gigabit Ethernet
Yes
Yes
Yes
US$1,717
USRP X300
Pre-built
DC to 6 GHz
200 Msps
 ?
Gigabit Ethernet, 10 Gigabit Ethernet, PCIe
Yes
Yes
Yes
US$3,900
USRP X310
Pre-built
DC to 6 GHz
200 Msps
 ?
Gigabit Ethernet, 10 Gigabit Ethernet, PCIe
Yes
Yes
Yes
US$4,800
Cross Country Wireless SDR receiver v. 3
Pre-built
472–479 kHz, 7.0–7.3 MHz/10.10–10.15 MHz, and 14.00–14.35 MHz
External ADC required (I/Q output)
1/1
Crystal controlled two channels
Yes
Yes
Yes
US$80
Realtek RTL2832U DVB-T tuner
Pre-built with custom driver
24–1766 MHz (R820T tuner) (sensitivity drops off considerably outside this range, but can go 0–2,200 MHz (E4000 tuner with direct sampling mod))
2.4 MHz (can go up to 3.2 MHz but drops samples)
 ?
USB
Yes
Yes
Yes
US$8 - US$10
SoftRock-40
Kit
7.5 MHz
48 kHz
1
USB
Yes
Yes
Yes
US$21
SoftRock RX Ensemble II
Kit
180 kHz – 3.0 MHz, and 1.8–30 MHz operation
External ADC required (I/Q output)
1
USB
Yes
Yes
Yes
US$67
ZS-1
Pre-built
300 kHz – 30 MHz
10 kHz, 20 kHz, 40 kHz, 100 kHz
3
USB 2.0
Yes
No
No
€1,399
HackRF One
Pre-built
1 MHz - 6 GHz
8 Msps - 20 Msps
1
USB 2.0
Yes
Yes
Yes
US$299
HiQSDR
prebuilt modules & kits, pcbs
30 kHz - 62 MHz
48 - 960 kHz
 ?
10/100 Ethernet
Yes
Yes
No
US$650
US$1,400
KiwiSDR
Pre-built
0.1 - 30Mhz
30Mhz
4
Beagle black
yes
yes
yes
 USD 99
LimeSDR
Pre-built (full Open Source / Hardware)
100 kHz to 3.8 GHz
61.44 Msps (12 bit ADC)
 ?
USB 3.0, PCIe
Yes
Yes
Yes
US$299(USB) US$799(PCIe)

Wednesday, August 24, 2016

How do you build a 1U Cube-Sat Linear transponder using SDR / DSP technology with limited Power?

How do you build a 1U Cube-Sat Linear transponder using SDR / DSP technology with limited Power?



Requirements:

Satellite requirements.
  1. Linear Transponder 70cm (437Mhz) up-link and S band (2.4GHz or 1.2Ghz down) Down-link (Bandwidth ? 250Khz on 70cm ?)
  2. Satellite Low Earth orbit (LEO) altitude between 650 kilometers. We need this so we can calculate path loss and RF power and antenna gain requirements.
  3. Available Power 1.5W for transponder from Solar panels and battery system.
  4. Telemetry mode? CW / AX25 / AFSK 9k6 /....  
    1. UHF Beacon recomendation.
      • UHF Beacon interval:  about 55 seconds
      • UHF Transmit power: ~ 1 W
      • AFSK AX25 1k2 and fallback of CW 10WP 
  5. Satellite antennas for 70cm ? and (Polarization ?) 
  6. Satellite antennas for 2.4Ghz / 1.2Ghz and (Polarization ?) 
  7. Telemetry Requirements ? (ID, Temperature, Power in, Power out, Battery left, Transponder Mode status, Antenna Status, Satellite Orientation, ........)
  8. Inter board Connector Specification (PC/104 communication)
  9. OBC, SOLAR,charger,Orientation and Battery from existing Satellite ?
  10. 1 U Cube-Sat Space frame from existing Satellite (10x10x10) 1kg
  11. DSP 10 to 14Bit A/D /D/A Dynamic range. what is good enough ?
  12. PCB Board size details PC104 with cutouts for wire.
  13. Space frame and Solar panel frame and Antenna deployment. (out of scope)
  14. Solar panels. (Out of Scope)
  15. Power regulator and Charge regulator and Battery. (out of Scope)
  16. Orientation controls. (out of scope) (Stabilization)
  17. RF Linear Transponder using SDR / DSP. (70cm up 2.4Ghz or 1.2Ghz down)
  18. OBC (In scope ARM M4 or possibly A9) (FreeRTOS)
  19. Inter board communication standard.

Out of Scope for now:


  1. Space frame, Solar panels and panels frame.
  2. Solar panels
  3. Power regulator and Charge regulator and Battery.
  4. Orientation controls.
In scope for now:

  1. Linear Transponder using SDR / DSP. (ARM Processor possibly not FPLG due to power constraint.)
  2. Telemetry TX
  3. Command control RX

Block diagram.


Transponder SDR transmitter. (Down-link 145.9?? MHz USB) (not confirmed) (250Khz)


Telemetry transmitter

  • Estimated TX full power for beacon and transponder (300 mW) when Sat is in sunlight.
  • When satellite is in eclipse low power of about (30mW)

Transponder SDR receiver. (Up-link 435.??? MHz LSB ) (not confirmed) (250Khz)


  • Estimated maximum TX up-link power of 5 watts with a 7 dBi gain antenna. 

Beacon / Telemetry

Here are several DDS signal generators I'm looking at:

  1. AD9833  0 - 12.5 Mhz 
  2. AD9850  0 - 50 Mhz
  3. AD9851  0 - 70 Mhz 
  4. Si5351    0 - 150 Mhz
  5. Si5351A 0 - 290 Mhz
  6. AD9959  0 - 500Mhz
  7. AD9952  0 - 500Mhz Practical max 160Mhz depending on patern
Ref : Examples code for the STM32f4  and AD9850  https://zissisprojects.wordpress.com/2015/01/24/stm32-f4-discovery-and-ad9850-dds/

1.2Ghz band plan for Downlink





TX

  1. https://github.com/F5OEO/rpitx
  2. http://ebrombaugh.studionebula.com/radio/txdac/index.html
  3. https://www.etherkit.com/rf-modules/si5351a-breakout-board.html
  4. http://www.simplecircuits.com/files/Download/QEX_release.pdf
  5. http://www.amrad.org/projects/sdr/
  6. https://myriadrf.org/projects/rdk/
  7. http://www.eevblog.com/forum/projects/the-sdr32-a-stm32-based-software-defined-radio/
  8. http://www.stm32-sdr.com/styled/index.html  (PSK)
  9. https://wiki.analog.com/resources/eval/user-guides/ad-fmcomms2-ebz/software/baremetal?rev=1395324588#code_size_information ( AD9361 NON OS Drive)
  10. https://github.com/GomSpace/libcsp (Cubesat Space Protoco)
  11. https://github.com/robots/APRS  (STM32 APRS code)
  12. https://michaldemin.wordpress.com/2012/02/27/cheap-afsk-tnc/  (AFSK stm3  2)
  13. https://github.com/athirasubhash/AX25MODEM (AX25 for STM32)
  14. www.analog.com/en/education/education-library/videos/3845680080001.html (Video Analog devices)
  15. https://datasheets.maximintegrated.com/en/ds/MAX2837.pdf  (IQ front end Maxim)
  16. https://www.maximintegrated.com/en/products/analog/data-converters/analog-front-end-ics/MAX5863.html (A/D and D/A MAXIM)
  17. https://github.com/mossmann/hackrf/blob/master/firmware/common/max2837.c (max2837 c Library)
  18. http://www.g4jnt.com/DDSVHFBeaconDriver.pdf  (DDS beacon generation)

Possible def tools.

  1. GNU radio
  2. Math lab
  3. ARM DEV board tools. (How to setup Eclipse for Arm development)
  4. Real time OS https://istarc.wordpress.com/2014/08/04/stm32f4-behold-the-project-wizard/
  5. Installing FreeRTOS on STM32F4 https://istarc.wordpress.com/2014/07/10/stm32f4-deploy-freertos-in-under-10-seconds/
Ref :

Friday, July 1, 2016

OpenWebRX with KiwiSDR covering the whole HF band 0 -30Mhz is now up and running in South Africa

OpenWebRX SDR covering the whole HF band 0 -30Mhz  is now up and running in South Africa

This Web based SDR http://zr6aic.giga.co.za:8073 is using the new KiwiSDR Hardware running on Beagle bone.

KiwiSDR using OpenWebRX running on Beagle.
This Web based SDR is covering the Whole HF band 0- 30Mhz. here is the link go and check it out.

Here is the list of receivers around the world using the OpenWebRx platform.

http://sdr.hu/
Here is the list of OpenWebRX servers around the world.

http://sdr.hu/

The KiwiSDR is available from Giga Technology. http://www.giga.co.za


Sunday, June 26, 2016

How to setup your NWT Spectrum Analyzer on Linux. (Ubuntu)

How to setup your NWT Spectrum Analyzer on Linux. (Ubuntu).



NWT70 in picture.

I got my Spectrum Analyzer and here are the steps I use to install and configure it on my Linux (Ubuntu) laptop.

Download the software here. http://www.dl4jal.eu/  link to the file http://www.dl4jal.eu/linnwt4_V4_11_10.tar.gz

Copy the file to your favorite directory
mkdir nwt
cd nwt
cp /home/anton/Downloads/linnwt4_V4_11_10.tar.gz  ./
Unzip the file in the directory.
unzip linnwt4_V4_11_10.tar.gz
Check if the files has unziped
There should be a directory linnwt4_V4_11_10 and cd to it.
cd linnwt4_V4_11_10
Check if you have qmake installed
qmake -v
 You need vertion QT 4 + if you don't have it, install it.
sudo apt-get install build-essential
now install QT
sudo apt-get install gcc qt4-qmake libqt4-dev
now create a directory build inside the linnwt4_V4_11_10 directory
mkdir build
Change to the build directory
cd build
run the gmake command
qmake -qt4 ../
Then run the make command
make
Get coffee ;-) it takes 2 min
There should the be a new file in exsiting directory called linnwt.
Connect your spectrum analizer to your laptop USB connector.
then run the apllication linnwt
sudo ./linnwt
mmmmm, its German!
no problem, run it with this parameter to get it in Englesh
sudo ./linnwt ../app_en.qm

USB device error could not find your NWT device.
So how do I identify my USB device and configure it in the software ?

Run the command tail -f /var/log/syslog


Then unplug your spectrum analyzer usb cable from laptop and reconnect it after 2 seconds to laptop.

There will be new text appearing in the terminal console. Something like this below.

Jun 26 11:55:07 anton-SATELLITE-P755 kernel: [51330.537093] usb 2-1.2: USB disconnect, device number 5
Jun 26 11:55:07 anton-SATELLITE-P755 kernel: [51330.537573] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
Jun 26 11:55:07 anton-SATELLITE-P755 kernel: [51330.537628] ftdi_sio 2-1.2:1.0: device disconnected
Jun 26 11:55:10 anton-SATELLITE-P755 bluetoothd[800]: Authentication attempt without agent
Jun 26 11:55:10 anton-SATELLITE-P755 bluetoothd[800]: Access denied: org.bluez.Error.Rejected
Jun 26 11:55:11 anton-SATELLITE-P755 kernel: [51334.756112] usb 2-1.2: new full-speed USB device number 6 using ehci-pci
Jun 26 11:55:11 anton-SATELLITE-P755 kernel: [51334.855421] usb 2-1.2: New USB device found, idVendor=0403, idProduct=6001
Jun 26 11:55:11 anton-SATELLITE-P755 kernel: [51334.855430] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Jun 26 11:55:11 anton-SATELLITE-P755 kernel: [51334.855434] usb 2-1.2: Product: FT232R USB UART
Jun 26 11:55:11 anton-SATELLITE-P755 kernel: [51334.855437] usb 2-1.2: Manufacturer: FTDI
Jun 26 11:55:11 anton-SATELLITE-P755 kernel: [51334.855440] usb 2-1.2: SerialNumber: AL01PTLP
Jun 26 11:55:11 anton-SATELLITE-P755 kernel: [51334.858330] ftdi_sio 2-1.2:1.0: FTDI USB Serial Device converter detected
Jun 26 11:55:11 anton-SATELLITE-P755 kernel: [51334.858406] usb 2-1.2: Detected FT232RL
Jun 26 11:55:11 anton-SATELLITE-P755 kernel: [51334.859036] usb 2-1.2: FTDI USB Serial Device converter now attached to ttyUSB0
Jun 26 11:55:12 anton-SATELLITE-P755 mtp-probe: checking bus 2, device 6: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2"
Jun 26 11:55:12 anton-SATELLITE-P755 mtp-probe: bus: 2, device: 6 was not an MTP device

You will be looking for ttyUSB?? in the text.

I my example, my usb was ttyUSB0

So now enter your ttyUSB?? in this usb port detail screen below. and then save your configeration.

Select the Settings > Options Menu from the pulldown menu in LinNWT4 application.

Change the value to /dev/ttyUSB?? Your port number found above.
In my case it was /dev/ttyUSB0

O.k., lets now setup a Frequency Spectrum scan.

Add frequency svan limits and then select a single or continuos scan option.

Connect your filter or circuit for testing on SMA terminals.

Then click on your Graphics display to see the return loss of you filter or circuit under test.

Scan display.
Hope this helps.
This spectrum Analizer is available from Giga Technology http://www.giga.co.za/ocart/index.php?route=product/product&product_id=226

Monday, February 22, 2016

Geostationary AMSAT Satellite (Phase 4) Spacecraft Covering the whole of Africa and Europe. (P4B) Es'hail-2

I think this Satellite will open up one of the most exiting telecommunication capabilities for Africa and Europe.(P4A/B) Es'hail-2 OS-100

Coverage map

Phase 4 AMSAT-DL planed

Qatar Satellite Company’s second satellite, Es’hailSat-2 (OS-100), will be placed in a geostationary orbit by a Space-X Falcon-9 rocket in November 2018. It will carry an AMSAT linear transponder as a secondary payload, giving Radio Amateurs access to a geostationary satellite for the first time.

Es’hailSat-2 will be “parked” 35 786 km above the equator at 25.5°East, nearly due North from Pretoria and Johannesburg (which are at 28°E).

Planned Frequency.

This satellite will have two linear transponders. (250 Khz and 8Mhz wide)
Narrow band transponder:
Up-links: 2400.050 - 2400.300 MHz modes SSB and CW. 5 Watt up link power,
Down links: 10489.550 - 10489.800 center 10 489.675 MHz. Vertical polarization.

Wide band transponder:
Up-links: 2401.500 - 2409.500 MHz
Down-links: 10491.000 -10499.000 MHz 

It will be so nice to have fixed antennas mounted on mast pointing to the satellite having continuous communication to any where in Africa and Europe. HI ;-) ;-)

Will have to start looking for some equipment and antennas for this one.

Link to Live websdr http://zr6aic.giga.co.za:8903

Live SDR of Es'hail 2 OS-100

Here is a list of Equipment that should work for the P4A satellite.

X-Band 10 GHz Down link:



HailSat-2 Down link configuration.

Please note Some LNB's is using a 22khz tone to switch Polarization.

Only the Generic LNB work with voltage switching.

Click to enlarge Satellite Systems



Here is how I inject my power. The black typed lead has an short peas of coaxle cable with an Inductor on Center peas going to a 13V Power supply.
Power DC blocker and Power injection

Top coax go to LNB
Left Bottom go to SDR and has build in Cap to isolate dc from SDR
Right Bottom has inductor on center going to 13V Power supply
Power Injection and DC isolation to SDR

I have change the LNB  to new one here is the LO details


LO 9.75 for 13V
I  had to do some calculations

Satellite frequency  For now is 10.706 - 9.75 = 0.956Mhz


For Narrow 250Khz Band Polarization is 0 deg V
Add caption 0 Deg V Polarization
Here is my 2.4Ghz Transmitting Antenna
2.4Ghz Tx Grid



Dish 60deg Elevation about 0 Deg Azimuth




2.4Ghz Transmitting Grid
View from back of two Antennas
Grid Mobile configuration

15db Grid antenna. just made it into satellite with ssb. CW was fine.


LNB (14 - 18V Polarization switching) 10.7Ghz

Generic one Port LNB Available from Giga Technology
Video of my first test on Eshail-2 using  Hackrf and preamp with and 2W PA and 2.4Ghz 15db Grid Antenna


Link to Live websdr http://zr6aic.giga.co.za:8903/
Websdr http://zr6aic.giga.co.za:8903


I think the signal must look lie this



Linear transponder 2400.050 - 2400.300 MHz Up-link 10489.550 - 10489.800 MHz Down link
Wide band digital transponder 2401.500 - 2409.500 MHz Up-link 10491.000 - 10499.000 MHz Down link

My RTL dongle needs to listen on the following frequency

LO with 12V injection = lo - 10.489500Ghz + 1M to get center of bottom of the Spectrum on websdr
=9.75Ghz - 10.489500Ghz + 1Mhz = 7395Mhz (this is still debatable )
  • 89 cm dishes in rainy areas at EOC like Brazil or Thailand.
  • 60 cm around coverage peak,
  • 75 cm dishes at peak -2dB.
Narrow Band : linear vertical polarization.
Wide Band: linear horizontal polarization.

S-Band 2.4 GHz Narrow Band-Uplink:
    • Narrow band modes like SSB, CW
    • 5W nominal Uplink power (22.5 dBi antenna gain, 75cm dish)
    • RHCP polarization

S-Band 2.4 GHz Wide Band-Uplink (DATV):

    • Wide band modes, DVB-S2
    • Peak EIRP of 53 dBW (2.4m dish and 100W) required
    • RHCP polarization


Azimuth and Elevation details for Johannesburg South Africa.
(For now the Elevation is 59.17 and Azimuth 350.43)

Azimuth and Elevation from Johannesburg
 Setting up elevation the simple way.


Paper with a piece of string at back of Dish

 Here is the Paper details


Gpredict tracking details.

Catalog number of Satellite is 43700

It seems that the satellite is still rotating around the equator

With the new TLE the Satellite has stabilized. at 59.17 Elevation and 350.43 Azimuth

Elevation is now 59.17 and Azimuth 350.43

2.4GHZ Transmitter.


The plan is to use my LimeSDR or hackrf for transmitter with low pass filter and a Power AMP. Details to follow

2.4Ghz Transmitter Diagram

Gnuradio Block diagram for Hackrf SSB


SSB Transmitter for Eshail2

Antenna setup

15db 2.4Ghz wifi Grid Antenna
I would recommend the 24db Grid or rather use 8 watt amp in 15db Grid.
Here is my presentation at the SARL on QO-100

My new transceiver setup.

  • 1) Raspberry Pi 3B +
  • Hackrf.
  • MSI SDR dongle 10Mhz Bandwith 12bit. RX.
  • 8W RF Amp.
  • 40db Pre-Amp
My Eshail-2 QO-100 transceiver setup.
Software on Raspberry Pi
Connect remotely via Wifi



Now start testing my Horizontal DBV-S2 Reception.

Video of DBV-S2 reception.



DBV-S2 decoding using leansdr (leandbv)



I will add more details soon.


https://docs.google.com/presentation/d/195l60I4IvKEl59Dl87AVFxjkrKzAcY5ZyUXNKXBXBcs/edit?usp=sharing


You can generate your own elevation and azimuth here http://www.satlex.us/en/azel_calc-params.html?satlo=&user_satlo=25.5&user_satlo_dir=E&location=-26.16%2C28.03&la=-26.16&lo=28.03&country_code=za&diam_w=75&diam_h=80

 REF:
Information http://amsat-uk.org/2015/07/03/phase-4-spacecraft-frequencies/
and here http://www.itu.int/en/ITU-R/space/workshops/2015-prague-small-sat/Presentations/Eshail-2.pdf
Spectrum Analizer for RTL https://github.com/pavels/spektrum/releases

Frequency list  http://frequencyplansatellites.altervista.org/Beacon-Telemetry_Europe-Africa-MiddleEast.html

Azimuth direction finding  http://www.satsig.net/ssazelm.htm