RTL-SDR

SDR

• https://hackaday.com/2021/03/08/what-can-a-30-usb-spectrum-analyser-do-for-me/

RTL-SDR

review

• https://www.elektor.com/blogs/review-blog/rtl-sdr-v4-better-than-v3-review

clones

Be careful, there are clones on the market that do not perform like the originals!

• the SDR-Blog store https://www.aliexpress.com/store/4523039?spm=2114.search0104.3.13.5f7b2d20Zqs83H

The RTL-SDR clones do not have a nut on the SMA connector! See https://www.rtl-sdr.com/rtl-sdr-blog-v-3-dongles-user-guide/

• specs https://www.rtl-sdr.com/wp-content/uploads/2018/02/RTL-SDR-Blog-V3-Datasheet.pdf
• github https://github.com/rtlsdrblog/rtl-sdr-blog

Radio TLS SDR USB Tuner Receiver RTLS2832U+R820T2 100 kHz-1.7Ghz

parts

• https://www.ebay.com.au/itm/234583995722?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
• https://www.h-instruments.com/product/rfspectrum-20
• https://www.youtube.com/watch?v=DSFIgjnkaf4
• https://www.aliexpress.com/item/1005006588161468.html?spm=a2g0o.productlist.main.21.42a35002183f0D&algo_pvid=69196d72-ab03-49b5-a04c-14f0b4178afc&algo_exp_id=69196d72-ab03-49b5-a04c-14f0b4178afc-10&pdp_npi=4%40dis%21AUD%2144.61%2134.02%21%21%21200.03%21152.54%21%402101eab017356874549911963ebc18%2112000037739865287%21sea%21AU%210%21ABX&curPageLogUid=tgWvTiqcm78w&utparam-url=scene%3Asearch%7Cquery_from%3A
• https://www.aliexpress.com/item/1005005651419698.html?spm=a2g0o.productlist.main.5.42a35002183f0D&algo_pvid=69196d72-ab03-49b5-a04c-14f0b4178afc&algo_exp_id=69196d72-ab03-49b5-a04c-14f0b4178afc-2&pdp_npi=4%40dis%21AUD%2170.18%2134.39%21%21%2143.07%2121.11%21%402101eab017356874549911963ebc18%2112000033891308038%21sea%21AU%210%21ABX&curPageLogUid=ijNIXRchBoHe&utparam-url=scene%3Asearch%7Cquery_from%3A
• https://www.aliexpress.com/item/1005005889517583.html?spm=a2g0o.productlist.main.73.2ba44f18albPQf&algo_pvid=466ecc82-6584-4737-afd2-e265dbf7cc37&algo_exp_id=466ecc82-6584-4737-afd2-e265dbf7cc37-36&pdp_npi=4%40dis%21AUD%21100.01%2137.62%21%21%2161.38%2123.09%21%402101ead817356877584792559e2bc2%2112000034718384504%21sea%21AU%210%21ABX&curPageLogUid=MFVtVtoQFeVv&utparam-url=scene%3Asearch%7Cquery_from%3A
• https://www.rtl-sdr.com/big-list-rtl-sdr-supported-software/

AirSpy

• https://airspy.com/
• AirSPy SDR https://airspy.com/download/ (all OS)
• https://www.rtl-sdr.com/category/airspy-2/
• downloads https://airspy.com/download/ - does support RTL dongles.

LNA

• https://www.aliexpress.com/item/33011424874.html?spm=a2g0o.productlist.main.37.42a35002183f0D&algo_pvid=69196d72-ab03-49b5-a04c-14f0b4178afc&algo_exp_id=69196d72-ab03-49b5-a04c-14f0b4178afc-18&pdp_npi=4%40dis%21AUD%2133.16%2120.78%21%21%2120.35%2112.75%21%402101eab017356874549911963ebc18%2167183464017%21sea%21AU%210%21ABX&curPageLogUid=SGK4PoUwPfs7&utparam-url=scene%3Asearch%7Cquery_from%3A
• noelec https://www.nooelec.com/store/sdr/sdr-addons/lana.html?srsltid=AfmBOooFkRsBxlQra3d6O5M-xHdelQ7urIWVPr5bHYZLDUlEfoDxhtXL
• https://www.nooelec.com/store/sdr/sdr-addons/lana.html?srsltid=AfmBOoo_H7yQxeJuCwmLT339BTMjwkBFefKo2rSaPC7SSiASwI9LiSJE
• https://www.amazon.com.au/dp/B0C9BXXFH2?tag=track-ec-au-1488958-22&linkCode=osi&th=1
• https://www.ebay.com.au/itm/395623579269?_skw=lna&hash=item5c1d00be85:g:iUMAAOSwDVlmzuuB&amdata=enc%3AAQAJAAAA4H%2FqIbIc6o8B4%2BvpFzQyE8Woh2vfKNsh4dBCq%2FpsoR69LRRPYSIPUpt4L7rKdjR2HvfJ%2BIS8SLh%2BuVfaAGlPR8x1jBvdkh5HKBgUhs352G2i7fQsBd3RoyVv0A%2Bf6h9Ji2R8kID2YNAGGgreQdOXKzXqGQX2SLfQuJrk0pEe0%2BrK8VbnL6Dv8QUZmodq3dOp8seIK8VDaKTwGbcEKU3dk7q1pjsvA84F5gh%2B%2FeaUPeCMhFu2MiuU0BCL1PfMIQ6RUF4VBF2h3CuOAQq%2FcZDVTJ%2F%2Bx8Hgl03pvGs2UNpSM3UZ&toolid=10001&campid=5338996090&customid=ecSEP14upbajm5czbfzp&mkevt=1&mkcid=1&mkrid=705-53470-19255-0&ufes_redirect=true
• https://www.ebay.com.au/itm/396064118752?_skw=lna&hash=item5c3742d7e0:g:TmgAAOSwbtxnbO5A&toolid=10001&campid=5338996090&customid=ecSEP14upbajm5czbg09&mkevt=1&mkcid=1&mkrid=705-53470-19255-0&ufes_redirect=true
• https://www.ebay.com.au/itm/226035906597?_skw=lna&hash=item34a0ca3825:g:UxEAAOSw1bdktPrZ&toolid=10001&campid=5338996090&customid=ecSEP14upbajm5czbg0d&mkevt=1&mkcid=1&mkrid=705-53470-19255-0&ufes_redirect=true
• https://www.amazon.com.au/dp/B0DQKT58S2?tag=track-ec-au-1488958-22&linkCode=osi&th=1&psc=1
• https://www.amazon.com.au/dp/B0BQ6SZF9P?tag=track-ec-au-1488958-22&linkCode=osi&th=1&psc=1
• https://www.ebay.com/itm/156391783953?_skw=low+noise+amplifier&itmmeta=01JGFAM5TW942C2REXKBAXGXEY&hash=item2469ad3e11:g:dWUAAOSwB0JmTV9r&itmprp=enc%3AAQAJAAAA0Mxmj%2BiGvOveHXEBClPb29gsE27uVUWwczTSSPUD5677dGu45vhhDzfBx%2FWYECYSlGRPxjX96OcJ8%2BcgsXZ1RzcuAvVPKZ3GW%2BOa%2BBW3V4hSA80231v3%2B5Dzrc2eJAWNa0J1Mpgh9v5gkCLs0ZI6pGljJLk8xs0GrGCVn20m7OrymEL3ypAZ6u4V8qwVi9ZiNUd%2BeSa6IxU6Xmk0rVaAXDZs0SRLFWv01bOIF3pgiiJ7k9QpG1ixos%2BP3%2FwaXMkgs%2BFbEk53UrB4gx9DqLbRp9o%3D%7Ctkp%3ABk9SR8bd0OqDZQ
• new https://www.ebay.com/itm/123916821851?_skw=low+noise+amplifier&itmmeta=01JGFAM5TX6YR78D521S42SWPK&hash=item1cda04a55b:g:I8gAAOSwYFldicpG&itmprp=enc%3AAQAJAAAA0Mxmj%2BiGvOveHXEBClPb29hRUAvQdS0M%2FpLTVzZ%2BOEiNIC7e75FJirqLFzi0Ffy3P1NjInSPvBkQROhRO5Oc4uQKj8EcWd7BjHvkkuFfurcMj%2BcU5BTQARTsVeNjQRHonE71rYwROABEImXU22ApgzJqHf9GZESr0LqC9Lg%2FU13ZGzgkbFCa6xyLL2XrDNiVgNykQsqnWQVcbtu%2FD3YL5m1l7MITCAkbcmlejRkrEwQTR%2BDeGLpzDdkVOi%2FA%2FuCvSlG69j89MNeUp588AOmRggU%3D%7Ctkp%3ABk9SR8bd0OqDZQ
• RTL https://www.ebay.com/itm/283455455676?_skw=LNA+bias-tee&epid=10026000785&itmmeta=01JGFB10Y4N3JHYNPRWZJSF71R&hash=item41ff4301bc:g:fqAAAOSw1lxct6~v&itmprp=enc%3AAQAJAAAA4HoV3kP08IDx%2BKZ9MfhVJKn7jh5XIcWbSF8DyGQTGhODk%2BKt3N1rdHgqn1DdnIe3g%2FF%2Bw5B3n%2FjqPEnT3kNFcM21zK9kWoJu%2F7%2BW%2BiOBly4YOz6b0plo4gSlxsB%2BLZZn%2FN3DWpjCtAhdYZeDOTmxgCFG%2FVHxhorOfpawxSKrkPi%2FY1QF8n6y%2B5tF%2FVBtwBekvvDxKu7%2Fpl--f3bxKWMPDgSxtU7Nh3E51hz7uBuhvubBY%2FnDAAuCyG7W7e3HEkHo8YClJu8IaxwhUEWXOHB4TW%2BN9cI6SQ2AyQzAke9CZS9L%7Ctkp%3ABFBMmI-E64Nl
• https://gpio.com/products/low-noise-amplifier-10-3000mhz-with-usb-output-bias-tee-esd
• https://www.aliexpress.com/item/1005007009575980.html?spm=a2g0o.detail.pcDetailTopMoreOtherSeller.4.380bpE3npE3n1O&gps-id=pcDetailTopMoreOtherSeller&scm=1007.14452.398467.0&scm_id=1007.14452.398467.0&scm-url=1007.14452.398467.0&pvid=a3b9ad7c-7a92-4a89-b2b2-644aff8e705a&_t=gps-id:pcDetailTopMoreOtherSeller,scm-url:1007.14452.398467.0,pvid:a3b9ad7c-7a92-4a89-b2b2-644aff8e705a,tpp_buckets:668%232846%238112%231997&pdp_npi=4%40dis%21AUD%2119.47%217.09%21%21%2187.33%2131.81%21%402103201917356871438321923e34ff%2112000039049888576%21rec%21AU%21%21ABXZ&utparam-url=scene%3ApcDetailTopMoreOtherSeller%7Cquery_from%3A&search_p4p_id=202412311519038746863137124073114721_3

filters

• https://www.aliexpress.com/item/1005007509062592.html?src=google&pdp_npi=4%40dis%21AUD%2119.39%2119.39%21%21%21%21%21%40%2112000041072054202%21ppc%21%21%21&src=google&albch=shopping&acnt=742-864-1166&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&gclsrc=aw.ds&&albagn=888888&&ds_e_adid=&ds_e_matchtype=&ds_e_device=c&ds_e_network=x&ds_e_product_group_id=&ds_e_product_id=en1005007509062592&ds_e_product_merchant_id=746146253&ds_e_product_country=AU&ds_e_product_language=en&ds_e_product_channel=online&ds_e_product_store_id=&ds_url_v=2&albcp=21819463808&albag=&isSmbAutoCall=false&needSmbHouyi=false&gad_source=1&gclid=EAIaIQobChMI1eTujZHTigMVwqtmAh3vrgRtEAQYBSABEgJGJPD_BwE
• https://www.aliexpress.com/item/1005007539456464.html?spm=a2g0o.detail.pcDetailTopMoreOtherSeller.10.27258AqX8AqXIq&gps-id=pcDetailTopMoreOtherSeller&scm=1007.40196.366991.0&scm_id=1007.40196.366991.0&scm-url=1007.40196.366991.0&pvid=615760b8-009f-4493-8a4c-b086c2dd8b93&_t=gps-id:pcDetailTopMoreOtherSeller,scm-url:1007.40196.366991.0,pvid:615760b8-009f-4493-8a4c-b086c2dd8b93,tpp_buckets:668%232846%238112%231997&pdp_npi=4%40dis%21AUD%219.05%211.61%21%21%2140.57%217.21%21%402103201917356868001041858e34ff%2112000041209207435%21rec%21AU%21%21ABX&utparam-url=scene%3ApcDetailTopMoreOtherSeller%7Cquery_from%3A
• https://www.aliexpress.com/item/1005007438690164.html?spm=a2g0o.detail.pcDetailTopMoreOtherSeller.12.380bpE3npE3n1O&gps-id=pcDetailTopMoreOtherSeller&scm=1007.40196.366991.0&scm_id=1007.40196.366991.0&scm-url=1007.40196.366991.0&pvid=1a51f113-3c37-4fff-9751-86a8cda3e16a&_t=gps-id:pcDetailTopMoreOtherSeller,scm-url:1007.40196.366991.0,pvid:1a51f113-3c37-4fff-9751-86a8cda3e16a,tpp_buckets:668%232846%238112%231997&pdp_npi=4%40dis%21AUD%2114.94%211.61%21%21%2167.00%217.21%21%402103201917356871438321923e34ff%2112000041060185340%21rec%21AU%21%21ABXZ&utparam-url=scene%3ApcDetailTopMoreOtherSeller%7Cquery_from%3A

915 MHz Bandpass filter

This BPF is nearly perfect for GSM band and would help remove out of band channel interference of SDR receivers.

OGN technical data

Open Glider Network.

FLARM frequencies

Frequency	Location
868.2-868.4 MHz	Europe Africa
869.2 MHz	New Zealand
902-928 MHz	North America
916.2 MHz	Israel
917-926.6 MHz	Australia South America

Firmware

OGN software is installed on a raspberrypi with an overlay filesystem.

• https://github.com/glidernet
• git repository https://github.com/glidernet
  • create a bootable image ogn-rf https://github.com/glidernet/ogn-rf
  • https://github.com/snip/OGN-receiver-RPI-image/blob/master/imageCreationSteps.md
  • OGN configuration https://github.com/b3nn0/ogn2dump1090/blob/master/ogn_setup.conf
  • manual installation http://wiki.glidernet.org/wiki:manual-installation-guide
• https://codingspirit.de/librtlsdr-driver.pdf
• FLARM https://www.fly-air3.com/en/ufaqs/flarm-of-air3-7-3-coverage/#:~:text=The%20Flarm%20module%20integrated%20in,MHz%20data%20communication%20frequency%20currently.
  • https://www.flarm.com/en/drones/atom-uav/
• snip
  • https://github.com/snip
• TXO and calibration
  • https://discussions.flightaware.com/t/frequency-drifting-with-flightaware-prostick-and-ogn/92770
• https://blog.jokielowie.com/en/blog/sledzimy-szybowce-samoloty-helikoptery-i-balony-cz-3-flarm
• OGN http://wiki.glidernet.org/ogn-receiver-hardware-and-software
  • http://wiki.glidernet.org/downloads

Antennas

These antennas provide a d.c. short to the input. This is undesireable for portable equipment where the LNA may need to be removed and the people are not aware or unable to turn the bias-tee off in the RTL dongle.

• https://ognproject.wdfiles.com/local--files/ogn-receiver-hardware-and-software/collinear_antenna.pdf
• inline Colinear antenna https://www.youtube.com/watch?v=1_1LxuOngHs
• https://www.balarad.net/

These do not provide a d.c. short to the input:

• 8 x 0.5 wave in phase https://k5frc.org/training/coliner%20antenna.pdf
• 8 x 0.5 wave in phase https://www.srgclub.org/CollinearAnt-HomeBrew.html
• 9dBi 8 x 0.5 wave https://www.repeater-builder.com/antenna/pdf/build-a-9dB-70cm-collinear-antenna-from-coax.pdf
• https://www.dxzone.com/dx36096/collinear-antenna-calculator.html#google_vignette

Measuring the velocity factor:

• https://www.jackenhack.com/diy-coaxial-collinear-antenna-ads-b-sdr-receiver-measuring-cable/
• https://owenduffy.net/blog/?p=18245
• via CH0 and CH1 phase shift or via TDR on CH0 https://www.youtube.com/watch?v=aWvPB299U60

Measuring ferrites:

• ferrites https://www.youtube.com/watch?v=LGwgn_0ADUI

tracking

• device range https://ktrax.kisstech.ch
  • VH-SXQ https://ktrax.kisstech.ch/plot?device=DDB6BE (-78 kHz off frequency, range 22.5 km)
  • VH-SVQ https://ktrax.kisstech.ch/plot?device=D00562
  • VH-DJU https://ktrax.kisstech.ch/plot?device=DD4F8D
  • VH-JUS https://ktrax.kisstech.ch/plot?device=DF217C (-9.45 kHz, range 40 km+)
  • VH-SMS https://ktrax.kisstech.ch/plot?device=DDB6C6 (+73.9 kHz, range 21 km)
  • VH-NKC https://ktrax.kisstech.ch/plot?device=DDB6BC (+78.8 kHz, range 24 km)
  • VH-DGU https://ktrax.kisstech.ch/plot?device=DD4F8D
  • VH-HDP https://ktrax.kisstech.ch/plot?device=DDB6B4 (+76.7 kHz range 38 km - very spotty might have been high)
  • VH-GOB https://ktrax.kisstech.ch/plot?device=DDDE3E
  • VH-DGI https://ktrax.kisstech.ch/plot?device=DDB459
  • VH-ZAK https://ktrax.kisstech.ch/plot?device=7C7E9A
  • VH-DGU https://ktrax.kisstech.ch/plot?device=DD4F8D
  • VH-XQT https://ktrax.kisstech.ch/plot?device=DDB6FE
  • VH-FQD https://ktrax.kisstech.ch/plot?device=DDB346
  • VH-YZJ https://ktrax.kisstech.ch/plot?device=7C7D0D (-13.4 kHz range 40 km + )
  • VH-UHM https://ktrax.kisstech.ch/plot?device=DF0B6A
• navplan https://www.navplan.ch/#/traffic
• https://live.glidernet.org/#c=-34.67092,148.02074&z=12&s=1
• http://wiki.glidernet.org/ogn-tracking-protocol
• https://tracking.livegliding.com/#!c=66,67&mz=8&mc=146.90834,-34.36949&time=1735698597&r=true&d=20250101
• https://flightbook.glidernet.org/logbook/YCTM/ can use this to lookup S-codes.

antenna design

Extract this data into a table. File:Antenna.xls Coax suppliers:

• https://rfshop.com.au/product-category/coaxial-cable/?utm_source=google&utm_medium=cpc&utm_campaign=18319066715&utm_content=141192502557&utm_term=coaxial%20cable&gad_source=1&gclid=EAIaIQobChMIg-aql63nigMVMYRLBR2bBAiCEAAYASAAEgJn6_D_BwE

power tap

• 
  • https://www.youtube.com/watch?v=fKPG1FWcB5c
• 
  • https://www.youtube.com/watch?v=v_eBQ4Qp1_E

SMA attentuators

• https://www.aliexpress.com/item/32889027071.html?spm=a2g0o.detail.pcDetailTopMoreOtherSeller.2.7faanqgPnqgPFx&gps-id=pcDetailTopMoreOtherSeller&scm=1007.14452.398467.0&scm_id=1007.14452.398467.0&scm-url=1007.14452.398467.0&pvid=2015c065-2a41-4f65-8213-6a2325c04061&_t=gps-id:pcDetailTopMoreOtherSeller,scm-url:1007.14452.398467.0,pvid:2015c065-2a41-4f65-8213-6a2325c04061,tpp_buckets:668%232846%238111%231996&pdp_npi=4%40dis%21AUD%2112.02%211.71%21%21%217.37%211.05%21%402103277f17363820541758818e1cd2%2112000020725508708%21rec%21AU%21%21ABXZ&utparam-url=scene%3ApcDetailTopMoreOtherSeller%7Cquery_from%3A&search_p4p_id=202501081620542123626034578479841923_1
• https://www.aliexpress.com/item/1005007373041563.html?spm=a2g0o.detail.similar_items.13.237fiM0hiM0hxG&utparam-url=scene%3Aimage_search%7Cquery_from%3Adetail_bigimg&pdp_npi=4%40dis%21AUD%2110.75%211.62%21%21%2148.42%217.31%21%402103277f17363822867566375e1cd2%2112000040473363365%21sea%21AU%210%21ABX

engineer SCGC FLARM RX

• scan for raspberry pi on SCGC WiFi router:

sudo nmap -sS 192.168.0/24

• look at stats

http://192.168.0.192:8080
http://192.168.0.192:8081

• login

ssh pi@192.168.0.192
runway06

• scan margin
  • https://chochol.io/en/hardware/ogn-receiver-installation-and-configuration-on-raspberry-pi/
• development
  • http://wiki.glidernet.org/ogn-tracking-protocol
  • http://wiki.glidernet.org/printer--friendly//dev
  • https://gitlab.com/lemoidului/ogn-flightbook/-/blob/master/README.md
  • https://gitlab.eqipe.ch/sgw
  • https://github.com/snip
    • https://github.com/snip/OGN-receiver-RPI-image
• binaries
  • http://download.glidernet.org/

overlay fs

• https://github.com/nils-werner/raspi-overlayroot/blob/master/README.md
• https://learn.adafruit.com/read-only-raspberry-pi/overview

Receiver Software

• https://github.com/gqrx-sdr/gqrx
• tweak
  • https://github.com/gat3way/r820tweak
• GNU RADIO https://wiki.gnuradio.org/index.php/Tutorials
  • https://greatscottgadgets.com/sdr/1/
• piaware
  • gain control https://fuzzthepiguy.tech/gain-control/
• https://www.rtl-sdr.com/tag/spectrum-analyzer-2/
• https://www.rtl-sdr.com/spektrum-new-rtl-sdr-spectrum-analyzer-software/
• SDR sharp Windows https://www.rtl-sdr.com/tag/install-guide/
• SDR Sharp Linux https://www.systranbox.com/how-to-install-sdrsharp-on-linux/
  • https://www.scivision.dev/sdr-sharp-ubuntu/
  • https://www.scivision.dev/rtlsdr-quickstart-linux/
  • HSPR https://github.com/n1gp/rtl_hpsdr
• RTLSDR-Airband
  • https://github.com/charlie-foxtrot/RTLSDR-Airband/blob/main/src/output.cpp
• Aviation
  • https://github.com/jprochazka/adsb-receiver
• feeding raspberry pi
  • to ADSB-X https://discussions.flightaware.com/t/feeding-fa-and-ads-b-exchange/81564/2
  • https://adsb.im/home
  • https://github.com/ADSBexchange/feedclient
  • https://github.com/wiedehopf/tar1090