Test & Measurement

RTL-SDR is an affordable dongle that can be used as a computer based radio scanner for receiving live radio signals in your area. This particular dongle includes a R820T2 tuner, a 1 PPM temperature compensated oscillator (TCXO), SMA F connector. It features an aluminium case with passive cooling via a thermal pad. Moreover, there is a software switchable bias tee circuit, supplementary ESD protection, lower overall noise and built-in direct sampling for HF reception. This device can receive frequencies from 500 kHz to 1.7 GHz and has up to 3.2 MHz of instantaneous bandwidth (2.4 MHz stable). Note: RTL-SDR dongles are RX only. You can use this kit either for terrestrial or satellite reception just by changing the orientation of the antenna. Thanks to the included mounts and extension cables it is possible to temporarily place the antenna outside for a better reception. Other potential applications are general radio scanning, air traffic control, public safety radio, ADSB, ACARS, trunked radio, P25 digital voice, POCSAG, weather balloons, APRS, NOAA APT weather satellites, radio astronomy, meteor scatter monitoring etc. Included RTL-SDR V3 Dongle (R820T2 RTL2832U 1PPM TCXO SMA) 2x 23 cm to 1 m telescopic antenna 2x 5 cm to 13 cm telescopic antenna Dipole Antenna Base with 60 cm RG174 extension cable 3 m RG174 extension cable Flexible Tripod Mount Suction Cup Mount Downloads Quick Start Guide SDR# User Guide Dipole Antenna Kit Guide

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Best value RTL-SDR on the market RTL-SDR is an affordable dongle that can be used as a computer-based radio scanner for receiving live radio signals between 500 kHz and 1.75 GHz in your area. The new RTL-SDR V4 offers several improvements over generic brands including use of the R828D tuner chip, triplexed input filter, notch filter, improved component tolerances, a 1 PPM temperature compensated oscillator (TCXO), SMA F connector, aluminium case with passive cooling, bias tee circuit, improved power supply, and a built in HF upconverter. RTL-SDR V4 comes with the portable dipole antenna kit. It is great for beginners as it allows for terrestrial and satellite reception and easy to mount outdoors and designed for portable and temporary outside usage. Features Improved HF reception: V4 now uses a built-in upconverter instead of using a direct sampling circuit. This means no more Nyquist folding of signals around 14.4 MHz, improved sensitivity, and adjustable gain on HF. Like the V3, the lower tuning range remains at 500 kHz and very strong reception may still require front end attenuation/filtering. Improved filtering: The V4 makes use of the R828D tuner chip, which has three inputs. The SMA input has been triplexed input into 3 bands: HF, VHF and UHF. This provides some isolation between the 3 bands, meaning out of band interference from strong broadcast stations is less likely to cause desensitization or imaging. Improved filtering x2: In addition to the triplexing, the open drain pin on the R828D can be also used, which allows to add simple notch filters for common interference bands such as broadcast AM, broadcast FM and the DAB bands. These only attenuate by a few dB, but may still help. Improved phase noise on strong signals: Due to an improved power supply design, phase noise from power supply noise has been significantly reduced. Less heat: Another advantage of the improved power supply is low power consumption and less heat generation compared to the V3. Included 1x RTL-SDR V4 dongle (R828D RTL2832U 1PPM TCXO SMA) 2x 23 cm to 1 m telescopic antenna 2x 5 cm to 13 cm telescopic antenna 1x Dipole antenna base with 60 cm RG174 1x 3 m RG174 extension cable 1x Flexible tripod mount 1x Suction cup mount Links User Guide Quick Start Guide SDR# User Guide Dipole Antenna Guide

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This set contains 10 semi-rigid RG402 adapter cables (SMA Male to SMA, BNC, Type N, Type F, UHF Male + Female adapters) with a length of 20 cm.

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The antenna allows for reception of L-band satellites that transmit between 1525-1660 MHz, such as Inmarsat, Iridium and GPS. Please note it is NOT for receiving weaker signals like HRPT and GOES which require a dish antenna. The patch comes with useful mounting accessories including a window suction cup, bendable tripod and 3M RG174 coax cable. The patch and active circuitry is enclosed in a weather proof enclosure. Links Inmarsat STD-C EGC AERO Satellite ACARS AERO C-Channel Voice Iridium Decoding GPS and GNSS Experiments

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This portable passive HF/VHF loop antenna is designed for low NF receivers. It also works with RTL-SDR in direct sampling mode if you enable RTL AGC. Signals can be boosted by using any external low cost HF amplifier, or even our wideband LNA. Specifications HF Portable & Flexible Receive Loop Antenna Covers HF frequencies (10 kHz to 30 MHz) Usable on FM/VHF up to 300 MHz as a folded Dipole Maximum power 250 mW Passive Design No Tuning required Low-Loss Wide-Band BALUN with 0.28 dB loss typ Connection: SMA Male on the end of the feedline Included 1x YouLoop T shaped low-loss wide-band BALUN 1x Coax Inverter Connector 2x Semi-rigid RG402 coax with SMA Male connectors – Branches (1 m) 1x Semi-rigid RG402 coax with SMA Male connectors – Transmission (2 m)

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This filter rejects signals between 88-108 MHz with around 50 dB or more attenuation. A broadcast FM band-stop filter is very useful for use with SDRs as in some areas broadcast FM signals can be so strong that they overload the SDR, causing very poor performance in other bands. You can tell if this is the case for you if you see images of BCFM stations or interference that looks like a WFM signal at other frequencies when you turn up the gain. The filter is based on a simple 7th order Chebyshev design. The 3 dB roll off is at 76 MHz and 122 MHz. 88 MHz is attenuated by almost 60 dB, and 108 MHz is attenuated by 45-50 dB. Outside of the pass band the insertion loss is practically zero below 500 MHz, less than 0.5 dB from 500 MHz – 1 GHz, and below 1.5 dB between 1-2 GHz. Between 2-3 GHz performance degrades slightly, but insertion loss remains below 1.5 dB for most frequencies. The filter can also pass up to 80 mA of DC current (probably can do more) and has negligible DC resistance. The filter comes in a 28 x 28 x 13 mm aluminum enclosure and uses female SMA connectors on each end. Included in the package is also a SMA male to SMA male straight barrel adapter.

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