of the complexity of the receive gear used at the Northern Utah WebSDR
the description of that gear is described on several pages:
- This page describes the "High Performance" receivers that use
"Softrock" direct-conversion receivers and sound cards. These
receivers cover limited bandwidth (up to about 192 kHz) but have excellent weak and strong signal handling properties.
RTL-SDR Dongle-based receivers
- Described here are the "not high performance" receivers using the
ubilquitous RTL-SDR dongles. These receivers cover up to 2 MHz of
bandwidth, but their limited A/D bit depth (only 8 bits)
means that they can suffer from too much and/or too little signal input
- often depending on band conditions. Included on this page is
information about how to make the most of these as well as helping to
manage when multiple RTL-SDR dongles are used on a Linux-based system.
RF Downconverter for RTL-SDR receivers
- While there are RTL-SDR dongles that contain built-in upconverters to
allow reception across the entire HF spectrum, this may not be the best
way to do it. When receiving frequencies at or above the Nyquist
frequencie(s) on HF, one can downconvert to lower frequencies and get
good results, all described on this page.
An AGC block for RTL-SDR receivers-
Because RTL-SDR dongles have only 8 bits of A/D, their dynamic range is
limited. While one can adjust the gain to fit their useful signal
range "window", HF band conditions change constantly, making it
impossible to keep one of these receivers's limited dynamics optimized.
Preceding an RTL-SDR dongle with proper filtering and an AGC
circuit can make the best of these devices.
RF Distribution and filter system
- Absolutely essential to any receive system is the means by which RF
is distributed - and filtered, the means by which this is done at the
Northern Utah WebSDR being described on this page.
For general information about this WebSDR system -
including contact info - go to the about
For the latest news about this system and current issues,
visit the latest news
For more information about this server you may contact
Clint, KA7OEI using his callsign at arrl dot net.
For more information about the WebSDR project in general -
including information about other WebSDR servers worldwide and
additional technical information - go to http://www.websdr.org