Post by F.Syndergaard
Jeg har været inde og se på det
og kan ikke finde noget diagram?
Hvad går det egentlig ud på?
ZERO-IF AND NEAR-ZERO-IF QUADRATURE RECEIVERS FOR SDR:
Zero Intermediate Frequency (ZIF) and Near Zero
Intermediate frequency (NZIF) quadrature receivers are
more sensitive to circuitry mismatch, which causes I-Q
imbalance that may be frequency dependent over the
Mar 1, 2003, A Low-noise, High-performance Zero IF Quadrature
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2300MHz
Highest Linearity, Lowest Noise 1.5GHz to 2.3GHz ZIF
Modulator/Demodulator Enables Zero-IF Direct-Conversion Architectures
for DCS/PCS EDGE BTS Transmitters:
A Software-Defined Radio for the Masses, Part 1:
Software Defined Radios. (anvender PowerSDR)
The radio that just keeps getting better!:
FlexRadio Systems delivers the first truly open source Software Defined
Radio transceiver for Amateur Radio use. Receive Only versions are also
available for non Amateur Radio applications. Read the SDR Articles
and the SDR-1000 Product Information.
New! Integrated Automatic Antenna Tuning Unit now shipping.
Software Defined Radio Articles by AC5OG:
A Software Defined Radio for the Masses, Part 4; QEX, Mar/Apr 2003.
The series concludes with a description of a DC-65MHz transceiver (the
SDR-1000) that will allow open software experimentation with
Linux Hamradio Application and Utilities Homepage: New/Updated software:
This software can demodulate DRM, AM, FM, SSB, CW from 12 kHz IF signal:
HDSSTV (nu RDFT):
The transmit side programs produce a wav file corresponding to the
binary file to be transferred. This wav file is then played by a sound
card, which produces the audio signal that is transmitted. The receive
side program converts a recorded wav file back into the original binary
file, if there were fewer errors than provided for by the error
Citat: "...In order to reflect what the software actually does, the name
"HDSSTV" has been changed to "RDFT". RDFT stands for Redundant Digital
A Brief Discussion of Some Software DSP Solutions I've tried:
DSP is an acronym for "Digital Signal Processing". Anytime an analog
signal is converted to digital form and processed in some way, that is
DSP. The use of DSP techniques in amateur radio is exploding, both in
terms of its use in commercial transceivers and receivers, and in terms
of homebrew hardware and software construction projects available to and
undertaken by hams
I have found that Linrad does an absolutely superb job of allowing me to
hear the desired weak signal hidden in the midst of the all the noise
and clutter present at my QTH. It does this better than any other
receiving system I have ever tried.
[PS: Nu kan man også få musearm af at være radioamatør...:]
By clicking with the mouse cursor at any point on the waterfall
IT IS POINT AND CLICK RECEIVING!!!
If you want a different filter bandwidth or shape factor, you just take
the mouse over to the baseband display, and drag the filter curve wider
or narrower, and the filter adjusts graphically. THIS REALLY WORKS!!
Linrad home page. (Part of SM 5 BSZ home page) (June 19 2005):
The T03DSP High Performance Transceiver with DSP IF processing:
This WEB site is dedicated to the design of the HF transceiver with DSP
IF processing. This design is the result of the more than 2 years
experimenting, writing software and designing hardware.
The DSP is operating at 120 MHz...600 MOPS
DSP-3 er udsolgt, men der arbejdes angiveligt på DSP-4:
RX-350 HF DSP RECEIVER (der findes en bedre udgave idag med DRM (Digital
Radio Mondiale) MF-udgang):
The built-in 34 bandwidth filters from 300 Hz to 8 kHz are instantly
selectable by turning a knob. All filters are independent of mode -
use any available filter in any receive mode.
Momentary 'SWEEP' function shows band activity in 8 selectable
coverage rates. Find the signals without even being on frequency!
Simply tune to a desired frequency, select one of 8 SWEEP ranges, and
press the SWEEP button. Signals will be shown on the bar graph on
opposite sides of the starting frequency. A cursor will appear and
allow you to tune RX-350 to any signal visible on the screen. Easy!
RX-350 HF DSP Receiver $1199.00
SPECTRUM SWEEP DISPLAY 8 widths from 240 Hz to 2.4 MHz, with tuning
cursor and selectable Autosweep function.
Til 2-meter båndet - og man kan lave EME (Earth-Moon-Earth) med den:
The DSP-10 is an amateur-radio, software-defined 2-meter transceiver
that can be built at home. It operates on SSB, FM and CW modes. Features
are tailored to operation with weak signals on VHF, UHF and Microwave
"...All schematics and design files are publicly available under a GNU
We're creating an open source Software Defined Radio. We're designing
the s/w and h/w to enable experimentation with the latest digital
Designing Filters for Software-Defined Radio
Her er en fiks og færdig DSP baseret HF-transceiver:
Ten-Tec is pleased to announce the successor to the original ORION
transceiver: ORION II:
Pris - sølle 3995$...av. Og så kan man ikke engang se SSTV, fjernsyn
eller Doom II på farveskærmen. Det er simpelthen anakronistisk at de har
sat et antikt drejespoleinstrument på forsiden hvor farveskærmen også er...
Opgradering? = ny firmware!