RTL-SDR: Difference between revisions

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[[Rf power tap and metering]]
[[Rf power tap and metering]]


==coax==
{{::coax}}
{| class=wikitable
! '''Coax''' !! LMR-600 !! RG-8X !!EcoFlex 10 !!Belden 9913 !!RG8/U !!LMR-400 !!RG-11 !!Westflex 103 !!RG-218 !!LMR-300 !!LMR-240 !!RG-213 !!RG-6 !!RG-142 !!RG-400 !!RG-58 !!RG-316
|-
| '''Inner''' ||solid BCCAI ||SC || stranded C ||solid BC ||S BC ||BC ||SC ||SC ||SBC ||Solid BC ||SC || S C || ||Copper Silver ||stranded TC ||
|-
| '''Dielectric''' ||foam PE ||foam PE ||low loss PE|| PE ||foam PE ||foam PE ||PE air ||PE ||PE foam ||foam PE ||PE ||foam PE ||PTFE ||PE ||
|-
| '''Outer''' || Outer tape and tinned copper ||AL tape tinned braid ||Copper tape copper braid ||Tri-laminate AL and braid ||Tinned Copper ||CCS ||CCS ||Copper Braid ||Al tape tinned C braid ||Al tape and tinned copper ||copper ||Al tape ||Copper braid ||Silver platted Copper Braid || Tinned Copper braid
|-
| '''dia centre''' ||4.47|| 2.74 ||2.85 ||2.7432 ||2.74 || ?||2.62 ||4.95 ||1.78 ||1.42 ||2.29 ||0.74 ||0.93 || ?|| ? || ?
|-
| '''dimens dielectric''' || 11.96 ||7.24 ||7.25 ||7.24 ||7.39 ||7.2 ||17.27 ||4.83 ||3.81 ||7.24 ||4.7 ||2.95 ||
|-
| '''Outer'''|| 12.45 ||8.13 < 10.2 || 8.13 || 8.13 || 9 ||5.72 ||4.52 ||7.98 ||6.3 ||3.96
|-
| '''V.F.''' || 0.85 ||0.85 || 0.84 || 0.84 || 0.84 || 0.81 || 0.66 || 0.85 || 0.83 || 0.66 || 0.66 || 0.7 || 0.695 || 0.659 || 0.69
|-
| '''Impedance ||50 ||50 ||50 ||50 ||50 ||75 ||50 ||50 ||50 ||50 ||50 ||75 ||50 ||50 ||50 ||50
|-
| '''Loss 100 Mhz per 100’ ''' || 0.8 ||1.5 ||1.22 ||1.4 ||1.4 ||1.46 ||1.40 ||1 ||2.1 ||2.1 ||2.1 ||2.9 ||3.9 ||4.4 ||4.9|| 11
|-
| '''Loss 1000 MHz per 100' ''' || 2.6 ||3.9 ||4.33 ||4.4 ||4 ||5.85 ||5.12 ||5 ||7.3 ||7.6 ||8 ||11 ||12.9 ||14.7 ||20 ||38
|-
|}


==urls==
==urls==

Latest revision as of 16:34, 2 December 2025

This page is a preliminary release.

SDR


RTL-SDR

Be Very Very careful to purchase the Rtl-Sdr from reputable suppliers - there are many fake and hacked units. The real ones are alleged to have a nut on the SMA connector and are all in aluminium cases (grey and black). There are also multiple versions with the bias-T; these require different software configuration. The V2 bias T has been well proven - do research on the V4 [1] [2] bias T SDR before purchasing.

review

clones

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

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/

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

parts

AirSpy

LNA

filters

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.

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.

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

Measuring the velocity factor:

Measuring ferrites:

tracking

antenna design

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

Rf power tap and metering

{{::coax}}

urls

SMA attentuators

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

overlay fs

Receiver Software

categories

  1. ↑ RTL-SDR V4 https://www.rtl-sdr.com/v4/
  2. ↑ RTLSDR V4 datasheet https://www.rtl-sdr.com/wp-content/uploads/2024/12/RTLSDR_V4_Datasheet_V_1_0.pdf
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