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M3AHQ England flag England

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Ham Member Lookups: 3244



my hobbys are caravanning and of course ham radio im active on hf aprs i have a radioworks carolina windom also a antron 99 ground mounted for 17m-6m. also active on vhf/uhf and aprs packet radio 144.800Mhz, HF 14.103Mhz & 10.147Mhz +/- 3hz offset. also active on dx tv bands I II III also fastscan tv 23cms and 13cms atv. packet radio software i use ui-view32 v2.03,latest agwtracker and for the tnc i use uz7ho soundmodem,& agw packet engine best 73s and good luck.

i also run the experimental Hebburn pmr446 frn gateway UK076-L voip gateway link on ch7 ctcss tone of 131.8 switched on when in the shack.

server cbaprs.de:27235 look for uk076-10 on map

cb-aprs.de 27.325mhz fm 1200baud ui-view32 v2.03 main freq used in europe

Monitoring FLEETSATCOM 240.00MHZ - 270.00MHZ

History and Discovery of RTLSDR

It turns out that Antti Palosaari is perhaps not entirely responsible alone in getting credit for the discovery of Realtek 2832U tuners being used for SDR. The RTL2382U parts were always intended by design for SDR as the dongles come with closed SDR software in Windows for DAB+ and FM reception on the mini CD. I think the credit for uncovering of what the Windows software does lies with a fellow named Eric Fry originally sniffing the USB packets from the Windows application in FM and DAB mode way back in March of 2010. He had hoped to get a DAB+ or FM receiver working in Linux (he had originally been providing unofficial support for Linux and this Quad Realtek DVB tuner). Eric and I discussed this privately at length and I made some reflections about this SDR feature in 2011 on the linux-tv mailing lists and discussed SDR potential on the associated #linux-tv IRC channel. Realtek had sent me some alpha FM SDR software for Linux with a promise of DAB+ to come. Antti's infamous email followed in early 2012. Very quickly the Realtek RTL2382U Linux driver and and some independent work by Osmocom (who were making their own E4000 based SDR) collided and in RTL-SDR as we know it exploded onto the scene.

So, the original 'discovery' lies with Eric. Much of the work getting the RTL2382U and it's associated tuners tamed in between then and now lies with Antti and Osmocom.

What is RTL-SDR

The RTL-SDR is an ultra cheap software defined radio based on DVB-T TV tuners with RTL2832U chips. The RTL-SDR can be used as a wide band radio scanner. It may interest ham radio enthusiasts, hardware hackers, tinkerers and anyone interested in RF.
                             SDR REMOTES ON AIR STATUS        http://status.sdrspace.com/onair.xml

                        online sdr-radio remotes      user = guest      password = fortknox

                to acess hf  please change upconvertor setting select radio  [up 125,000,000 ] also change frequency calibration settings PPM parts per million = 42 for correct freq readout                                                                 

                  M3AHQ  SDR-RADIO V2.3 REMOTE 160m-6m  antenna :- 60 feet end fed long wire unun balun                                                    

              M3AHQ  SDR-RADIO V2.3 REMOTE 25mhz - 1300mhz  6m,10m,2m70cms   antenna :- quadband vertical base


                                                                 COMING  SOON NEW RADIO                                           

Rcforb Remote By RemoteHams icom ic718 All Mode HF Receiver,Unun Balun End Fed 60ft Long Wire Antenna 10ft Above Ground Level Coverage 160m-6m


Aprs Vhf :- 2m yaesu ft-2600m,old school aea pk-88, pc dell gx series,sat comms receiving iss

Aprs Hf :- 10.147mhz,14.103mhz,Pkt rate 4pkts = 1hour yaesu ft-100mk1,interface rigblaster pro,pc

Radio Software:- Ui-View32 v2.03,UI-PATH32,UI-PHG-DFS

echolink and rcforb Remote Base client :- running a studio microphone with boom mount into a basic 3ch behringer xenyx 502 mixing desk will be upgrading to 16channel mixing desk SOON

experimenting with sdr-radio receiver via a ezcap dvb-t usb stick rtl2832u e400 tuner chipset coverage 25mhz - 1.3ghz vhf-uhf receiver using hdsdr software.also a  nooelec upconvertor for hf bands.

Contact via allstar link network

Contact via Echolink Node Number 52055

Contact Via Aprs M3ahq-10 Via Tcpip internet

Contact Via M3ahq -15 Aprs hf 14.103mhz lsb 300baud

Contact Via Skype :- jim,m3ahq2014

Contact Via Mobile Phone 07873818786

Contact Via 145.500mhz or 433.000mhz gb3nt Monitoring



What is RTL-SDR?

RTL-SDR is a very cheap software defined radio that uses a DVB-T TV tuner dongle based on the RTL2832U chipset. With the combined efforts of Antti Palosaari, Eric Fry and Osmocom it was found that the signal I/Q data could be accessed directly, which allowed the DVB-T TV tuner to be converted into a wideband software defined radio via a new software driver.

Essentially, this means that a cheap $20 TV tuner USB dongle with the RTL2832U chip can be used as a computer based radio scanner. This sort of scanner capability would have cost hundreds or even thousands of dollars just a few years ago. The RTL-SDR is also often referred to as RTL2832U, DVB-T SDR, RTL dongle or the “$20 Software Defined Radio”.

There are many other software defined radios similar to the RTL-SDR, but they all come at a much higher price. The FunCube PRO+ is a good receiver similar to the RTL-SDR, priced at around $190 USD. There is now also the Airspy ($200) and SDRPlay ($300). Then there are the HackRF ($300USD) and BladeRF SDRs ($420 and $650), which can both transmit and receive.

What is Software Defined Radio?

Radio components such as modulators, demodulators and amplifiers are traditionally implemented in hardware components. The advent of modern computing allows most of these traditionally hardware based components to be implemented into software instead. Hence, the software defined radio. This enables easy signal processing and thus cheap wide band scanner radios to be produced.

What are some RTL-SDR Radio Scanner Applications?

The RTL-SDR can be used as a wide band radio scanner. Applications include:

Furthermore, with an upconverter or direct sampling mod to receive HF signals the applications are expanded to:

  • Listening to amateur radio hams on SSB with LSB/USB modulation.
  • Decoding digital amateur radio ham communications such as CW/PSK/RTTY/SSTV.
  • Receiving HF weatherfax.
  • Receiving digital radio monodial shortwave radio (DRM).
  • Listening to international shortwave radio.
  • Looking for RADAR signals like over the horizon (OTH) radar, and HAARP signals.

Note that not all the applications listed may be legal in your country. Please be responsible.

What is the RTL-SDR frequency range?

This is dependant on the particular tuner variant used in the dongle.

Tuner Frequency range
Elonics E4000 52 – 2200 MHz with a gap from 1100 MHz to 1250 MHz (varies)
Rafael Micro R820T 24 – 1766 MHz (Can be improved to ~13 – 1864 MHz with experimental drivers)
Fitipower FC0013 22 – 1100 MHz
Fitipower FC0012 22 – 948.6 MHz
FCI FC2580 146 – 308 MHz and 438 – 924 MHz (gap in between)

Table Source: Osmocom

As you can see from the table, the Elonics E4000 and Rafael Micro R820T dongles have the greatest frequency range.

What is the RTL-SDRs sample rate?

The maximum sample rate is 3.2 MS/s (mega samples per second). However, the RTL-SDR is unstable at this rate and may drop samples. The maximum sample rate that does not drop samples is 2.4 MS/s, however some people have had luck with 2.8MS/s and 3.2 MS/s working well on some USB 3.0 ports.

What is the RTL-SDR’s ADC resolution?

The native resolution is 8 bits, but the Effective Number of Bits (ENOB) is estimated at ~7. Decimation in software may raise this value.

What is the RTL-SDR input impedance?

Since these dongles are intended for TV, all dongles will have an input impedance of about 75 Ohms. However, the mismatch loss when using 50 Ohm cabling will be very minimal  at around 0.177 dB.

The 75 Ohm impedance for the R820T can be checked on the datasheet which can be downloaded her







8018815 Last modified: 2017-04-08 06:25:51, 20873 bytes

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M6CTI 2012-01-17 2m PKT IO91sk England John Roberts
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