BeagleScanSpec,
My project is to utilize a BeagleBoard and readily available digital
tuners along with some external circuitry to produce a radio
frequencies scanner and spectrum analyser for 1.8 MHz through 30 MHz
and 50 MHz through 800 MHz.
Interfacing to the various recievers is done with I2C and USB. I2C interfacing can be easily done with voltage translators.
Some additional circuitry will provide wideband and narrowband reception for two purposes.
1) NOAA POES weather satellite reception in the 137.00 - 138.00 MHz band requires a 35 KHz audio bandwidth. This satellite signal is saved as a .wav file for later decoding.
2) A wider bandwidth output range will provide a RF spectrum analyser.
This project includes a Software Defined Radio (SDR) that covers the frequency range 1.8 MHz through 30 MHz. Coverage is selected in one of four bands.
1. Band 0: 160m - Continuous coverage from 1.8 to 2.0 MHz
2. Band 1: 80m and 40m - Continuous coverage from 3.5 to 7.3 MHz
3. Band 2: 30m, 20m, and 17m - Continuous coverage from 10.1 to 18.168 MHz
4. Band 3: 15m, 12m, and 10m - Continuous coverage from 21.0 to 29.7 MHz
This receiver implements a quadrature sampling detector to produce low frequency I and Q signals for input to the stereo line in inputs of the BeagleBoard or a PC sound card.
And a standard digital Television tuner covering:
FM band 76.00 to 108.00 MHz, Mono / Stereo
Low band 55.25 to 160.00 MHz
Mid band 160.00 to 442.00 MHz
High band 442.00 to 801.25 MHz
NOAA POES / APT satellite reception and Spectrum analyser signals
will be extracted from a 2nd IF sound output.
Presently I am working with the Phillips BU RF series 1236F-H3 digital tuner.
This tuner takes more data input but works very well. The frequency I select and compute
is what I get.
I first used the Temic 4036FY5 digital tuner:
Of course a person should really get into their work.
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Last edited:09/06/2011, by Don Lewis, Wye Mountain Observatory