Software defined radio

Hej Martin



Ja, det er let at gå til, det mester drejer sig om software, selve den
elektriske del er rimelig overskuelig. Man kan for få hundrede kroner
lave en radio der er som en der kostede adskellige tusinde for år tilbage.
F.aks. kan man købe en af de moderne digitale TV modtager dongler
til en halvtredser, så kan man modtage hele VHF og UHF området
ved hjælp af den og en computer.

Søg lidt på SDR på nettet og så finder du masser af artikler
om emnet, på youtube er der også masser.

Noget specielt du tænker på at lytte ?

Max wrote:



Nej egentligt ikke, men jeg har altid været interesseret i  
kortbølgelytning og har en fin sony SW100 som jeg førhen brugte en del i  
udlandet til at høre bl.a. DR kortbølge samt BBC mv.

Selv om jeg ikke har lyttet til kortbølge i nogle år interesseret det  
mig stadig, og når det så kombineres med computer er det yderligere et plus.

Den 27-12-2012 23:18, Martin Larsen skrev:

Du kan prøve at søge på

www.brugtgrej.dk

hvor der ofte findes modtagere til SDR. Bl.a. fra EDR's horsensafd. har  
de haft et project med SDR kaldt LIMA, der oprindeligt stammer fra  
Tyskland som byggesæt.

On 27/12/12 23.18, Martin Larsen wrote:
...

...


Hej Martin

SDR findes i din:
* Mobiltelefon
* Smart-phone
* Trådløse access-punkt/router
* Trådløse netkort
* Bluetooth dimser
* De fleste DVB-T/S/C(2) dimser (USB, tv-modtagerbokse, TV,  
harddiskoptagere, media-centre, HTPC...)
...

-

Mange frit tilgængelige internet-fjernstyrede radiomodtager er baseret  
på SDR - prøv dem via kilderne og links!:
http://da.wikipedia.org/wiki/Internet-fjernstyret_radiomodtager

A Brief Discussion of Some Software DSP Solutions I've tried:
http://www.nitehawk.com/w3sz/w3szdspnew.htm
Citat: "...
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!!
..."

-

Teknisk:

Se:
http://da.wikipedia.org/wiki/Software_defineret_radio

SDR anvendes typisk sammen med:

Zero-IF receiver:
http://en.wikipedia.org/wiki/Direct-conversion_receiver

Andre relaterede eller ens termer (kært barn har mange navne?):

Quadrature Sampling Detector QSD
(Dan Tayloe N7VE):
Tayloe Detector
IQ based tranceiver
Dirodyne

Til sender: quadrature-sampling exciter (QSE)

God (tysk): Quadrature Sampling Detector - ein moderner  
Geradeausempfänger [retmodtager]:
http://www.andreadrian.de/sdr/index.html#mozTocId54134

IQ-kanalerne laves noget i denne stil:
http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation#Receiver

I/Q In-phase/Quadrature component:
http://en.wikipedia.org/wiki/Quadrature_phase
Citat: "...The component that is in phase with the original carrier is  
referred to as the in-phase component. The other component, which is  
always 90° (\begin \frac \end radians) out of  
phase, is referred to as the quadrature component..."


IQ-signalbehandling er faktisk en gammel metode som også anvendes ved  
analog (og digital) SSB-(de)modulation:

http://en.wikipedia.org/wiki/Single-sideband_modulation#Hartley_modulator
Citat: "...
To generate an SSB signal with this method, two versions of the original  
signal are generated which are mutually 90° out of phase. Each one of  
these signals is then mixed with carrier waves that are also 90° out of  
phase with each other. By either adding or subtracting the resulting  
signals, a lower or upper sideband signal results.
..."

Det er vistnok denne metode YU1LM anvender:

http://en.wikipedia.org/wiki/Single-sideband_modulation#Weaver_modulator
Citat: "...
In Weaver's method, the band of interest is first translated to be  
centered at zero, conceptually by modulating a complex exponential  
exp(j?t) with frequency in the middle of the voiceband, but implemented  
by a quadrature pair of sine and cosine modulators at that frequency  
(e.g. 2 kHz). This complex signal or pair of real signals is then  
lowpass filtered to remove the undesired sideband that is not centered  
at zero. Then, the single-sideband complex signal centered at zero is  
upconverted to a real signal, by another pair of quadrature mixers, to  
the desired center frequency.
..."

ZERO-IF AND NEAR-ZERO-IF QUADRATURE RECEIVERS FOR SDR:
http://www.sdrforum.org/pages/sdr02/HW3-01%20Gu.pdf
Citat: "...
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
signal bandwidth.
..."


I Softrock anvendes 74HC4052 og andre CMOS baserede digitalt styrede  
kontakter som I/Q-mikser:

SM 5 BSZ - I/Q mixer for direct conversion radio
(Sept 28 2001):
http://www.sm5bsz.com/linuxdsp/iqmixer.htm
Citat: "...
The simple HCMOS mixer in fig 1. produces a second order spur at -50dB  
when the level is adjusted for a standard low noise op-amp to degrade  
the dynamic range by less than 3dB.
...
Fig 1. A quadrature nixer [mixer] using 74HC4052. The control inputs are  
fed from a synchronous counter that divides a local oscillator by four.  
As a result the switch loops through all four positions during a period  
of 4 local oscillator cycles, see fig. 2. For each switch position only  
one connection is made between the antenna and either output. This way  
the make before break operation of the switch will not cause  
shortcircuits across the coil as would be the case using 74HC4053 as in  
an  older design. The dynamic range of the 74HC4052 design is superior  
to that of the 74HC4053 design.
..."

-

Ældre:


RX-350 HF DSP RECEIVER (der findes en bedre udgave idag med DRM (Digital  
Radio Mondiale) MF-udgang):
http://www.tentec.com/rx350.htm
"...
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.
..."

-

Her er en fiks og færdig SDR/DSP baseret HF-transceiver:

Ten-Tec is pleased to announce the successor to the original ORION  
transceiver: ORION II:
http://radio.tentec.com/Amateur/Transceivers/TT565

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!

-

Det flyder også med selv-byg SDR:

SoftRock-40:
http://groups.yahoo.com/group/softrock40/
Citat: "...
The SoftRock-40 is a small, low-cost, good performing 40-meter "software  
defined radio" receiver that plugs into a computer USB port and delivers  
I-Q audio signals to the computer's sound card. It was designed by Tony  
Parks, KB9YIG and Bill Tracey, KD5TFD as an "SDR sampler project" for  
hams everywhere to easily try out software defined radio.
..."

og deriviater:

8. November 2008 Informationen zum SoftRock RXTXv6.3 XTALL:
http://softrock.raisdorf.org/RXTXv6-3.html

http://www.sdr-kits.net/

http://www.amqrp.org/kits/softrock40/

PowerSDRv1.12.0 SoftRock RxTx Si570 Setup.msi:
http://code.google.com/p/powersdr-iq/downloads/detail?name=PowerSDRv1.12.0%20SoftRock%20RxTx%20Si570%20Setup.msi&can=2&q=
http://powersdr-softrock-rxtx-si570.software.informer.com/

PowerSDR Software For Software Defined Radio I.F. Stage Use
http://www.wu2x.com/sdr.html

http://www.nonstopsystems.com/radio/frank_radio_sdr.htm
http://www.nonstopsystems.com/radio/
http://www.hamsdr.com/WA2DFI/Hands_On_SDR_%20Dayton_2008_v0_9.ppt

http://qrpradio.org/pub/softrocks/manuals/softrock%20v6.1%20rxtx/

Euro SOFTROCK-RXTX ?87:
http://www.wsplc.com/acatalog/SOFTROCK-RXTX.html
Essex:
http://www.wsplc.com/contactus.php
http://www.wsplc.com/acatalog/Kits_-_Softrock.html

http://www.m0kgk.co.uk/sdr/softrocks.php
http://wb5rvz.com/sdr/RXTX_V6_3/

Softrock RxTx:
http://www.softrockradio.org/node/171
SoftRock V7.0:
http://www.softrockradio.org/node/31
http://www.qrpradio.org/pub/softrocks/manuals/softrock%20V7/
http://www.qrpradio.org/pub/softrocks/manuals/

A small, low-cost "Software Defined Radio" receiver kit for 40-meters,  
used with powerful software on the PC for multi-mode operation:
http://www.amqrp.org/kits/softrock40/

-

For radioamatører (ældre):

W7PUA DSP-10 2 Meter.
[SDR] Software Defined Transceiver.
Surface-Mount Kit:
http://www.tapr.org/tapr/html/Fdsp10.html

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 frequencies.
DSP-10 All-Mode 2m:
http://www.proaxis.com/~boblark/dsp10.htm

DSP-10 Weak-Signal Update.
2-Meter EME [Earth-Moon-Earth] QSO with Single Yagis and 150 Watts:
http://www.proaxis.com/~boblark/wksig1.htm

W7PUA DSP-10 2 Meter
Software Defined Transceiver
Surface-Mount Kit
http://www.tapr.org/tapr/html/Fdsp10.html

-

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  
wireless protocols:
http://sourceforge.net/projects/opensdr/
http://opensdr.sourceforge.net/
http://sourceforge.net/projects/opensdr/
http://prdownloads.sourceforge.net/opensdr/

-

http://gnuradio.org/
http://www.gnu.org/software/gnuradio/
http://mail.gnu.org/mailman/listinfo/discuss-gnuradio

-

RadioRaft 3.21
Multimode Radio Data Decoder Software for decoding
12 ARQ modes, 10 FEC modes,  3 packet modes and many others ...
http://radioraft.pagespro-orange.fr/

-

openQRP:
http://openqrp.org/

Software Defined Radio:
http://sdr-radio.com/

SDR forum 2.0:
http://www.wirelessinnovation.org/

Software Defined Radio "Blueberry SDR":
http://www.andreadrian.de/sdr/index.html

Building and Using the WB6DHW
http://wb6dhw.com/AD995x%20Manual.pdf

http://www.hamsdr.com/dnld.aspx
http://www.hamsdr.com/dnld.aspx?id10%37

This software can demodulate DRM, AM, FM, SSB, CW from 12 kHz IF signal:
http://drm.sourceforge.net/

http://www.n9vv.com/hamradio.html

issue 365, May 2007, Elektor: Software Defined Radio With USB interface:
http://www.elektor.com/magazines/2007/may/software-defined-radio.91527.lynkx

http://www.arrl.org/software-defined-radio
A Software Defined Radio for the Masses, Part 4:
http://www.arrl.org/tis/info/pdf/030304qex020.pdf

DIGITAL IF: The VITA (49) Radio Transport (VRT)
Providing Interoperability for Software Defined Radios:
http://web.archive.org/web/20110629072525/www.digitalif.org/
http://www.digitalif.org/

jansky eme:
http://www.nitehawk.com/rasmit/
http://www.nitehawk.com/rasmit/dsp50.html
http://www.physics.princeton.edu/pulsar/K1JT/
http://www.dxzone.com/tag-weak-signal/
http://sharon.esrac.ele.tue.nl/mirrors/zl1bpu/MFSK/INDEX.html
MFSK means Multi - Frequency Shift Keying
http://xoomer.virgilio.it/aporcino/Stream/index.htm
http://xoomer.virgilio.it/aporcino/
http://www.sm5bsz.com/
http://microtelecom.it/perseus/
849,00 ?
http://www.ssb.de/product_info.php?info=p1390_Perseus-SDR-Kurzwellenempfaenger-10-kHz---40MHz.html
http://www.sdrham.com/winrad/
VIP Perseus hovedside:
http://openhpsdr.org/
http://tapr.org/
$1100
http://www.hpsdr.eu/
http://openhpsdr.org/wiki/index.php?title=Main_Page
http://openhpsdr.org/wiki/index.php?title=MERCURY
Penelope:
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item27%0519945097
http://openhpsdr.org/wiki/index.php?title=A_complete_HPSDR_transceiver
http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
Mail-lister:
http://openhpsdr.org/reflector.html

-

http://www.flex-radio.com/
http://www.flex-radio.com/Products.aspx?topic=powersdr1x
http://uwsdr.berlios.de/
http://www.flex-radio.com/
Citat: "...
Additionally, all A/D conversions are performed internally  in the  
FLEX-5000 so a sound card is not required. There are two additional  
versions of the FLEX-5000 (models C and D) that provide higher levels of  
integration.
...
The FLEX-5000C? model has a built in Intel Core2 Duo processor and comes  
with the Microsoft Windows XP operating system, wireless keyboard and  
mouse. The FLEX-5000D? includes everything above and adds a 9" LCD  
display with touch screen, 300 Watt PA and a large tuning knob.
..."

The FlexRadio FLEX-5000A?
High Performance Software Defined Radio at its Best!
http://www.flex-radio.com/Products.aspx?topicF5%Ka_details
Citat: "...
Top Performing Narrow-Spaced Two-Tone 3rd Order IMD Dynamic Range at 2  
KHz - (Not 20 KHz Like Everyone Else Advertises).  An Incredible 105 dB  
on 14 MHz.
...
Industry Leading Narrow Spaced 3rd Order Intercept Point:  +33 dBm at 2  
KHz Tone Spacing.
...
No Sound Card Required!
No longer do you have to worry about interfacing a sound card to your  
PC.  The FLEX-5000 has integrated the A/D and D/A processing hardware  
built inside the radio.  A high quality 192 KHz 24-bit DACs with  
exceptional performance numbers provides the spectral samples for the  
DSP to process.  The integrated converters also eliminate audio cabling  
requirements between the transceiver and PC.
...
True Full Duplex Operation for Simultaneous Transmit and Receive
...
True Diversity Receiving with the Second Independent Receiver
...
By locking both receivers to the same frequency you can produce "stereo  
diversity" which allows your brain to more easily sort the signal from  
the noise.
...
Single 1394 FireWire Connection to your Computer
...
Transverter Ready - Full Duplex 28 MHz IF
The FLEX-5000's incredible receiver is perfect for weak signal VHF+ and  
WSJT operation as a 28 MHz IF for interfacing to external transverters.  
The FLEX-5000 will turn your VHF-UHF-microwave setup into the highest  
performance station around.  Full duplex operation opens the door for  
satellite communications as well.
...
No External Calibration Equipment Required
..."

FLEX-5000 Block Diagram
This PDF file is the block diagram of the FLEX-5000 full duplex /triplex  
architecture:
http://support.flex-radio.com/Downloads.aspx?id15%2

Fundet via:
http://support.flex-radio.com/Downloads.aspx

-

MAX2023
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2300MHz  
Quadrature Mod/Demod.
Highest Linearity, Lowest Noise 1.5GHz to 2.3GHz ZIF  
Modulator/Demodulator Enables Zero-IF Direct-Conversion Architectures  
for DCS/PCS EDGE BTS Transmitters:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5141

/Glenn

Jeg lytter til audio i hovedtelefon gennem en FM transmitter i audio
stikket på min Macbook når jeg ser TV (over LAN fra en Elgato EyeTV
Netstream DTT):

<http://www.proshop.dk/MP3-afspiller-og-tilbehoer/Belkin-TuneCast-II-Mob
ileFM-Transmitter-2145851.html>

FM signalet modtages med en ældre (analog) Sony FM Walkman:

<

http://users.cybercity.dk/~dsl487543/FMwalkman.jpg

Fin lydstyrke. Jeg er nød til at skrue ned selvom jeg har dårlig
hørelse.

Jeg har så anskaffet en Ennovia DAB+/FM Bærbar Radio modtager, model
EN-DAB51

<

http://users.cybercity.dk/~dsl487543/EN-DAB51.jpg

Det er vel nok en SDR? Medens lydstyrken på DAB/DAB+ er fin når det er
radio, så er lydstyrken på FM radio (analog) meget dårlig/lav.

Er det mon fordi en SDR ikke "oversætter" det analoge signal godt nok?

Findes der så en (digital?) transmitter, der vil virke bedre med DAB+/FM
modtageren end min nuværende (Belkin) FM transmitter?

<snip>  



Gælder osse for lyden med FM signalet fra Belkin FM transmitteren.

On 01/01/13 08.55, Axel Hammerschmidt wrote:
...


Den specifikke SDR - nok ja. Især hvis A/D-konvereteren ikke omsætter  
til nok bits - og den digitale signalbehandling ikke foregår med nok  
bits og dermed laver grovere afrundninger.

Generelt om SDR - nok nej. Men SDR er selvfølgelig ikke garanti for god  
lydkvalitet.



Mon der er andre der kan svare på det?

/Glenn

On 01/01/13 13.13, Glenn wrote:

...

Hej Axel

Mere om emnet:

Is it difficult to do FM demodulation digitally?:
http://www.dsprelated.com/showmessage/142012/1.php
Citat: "...
However, if one looks at many reports of the FlexRadio software
defined radio, it is clear that FlexRadio have never succeeded in
getting a decent FM demodulator. The performance of those never seems
to live up to the hype.
...
But to add a DSP and A/D just for demodulation is pricey compared a
simple analog pll demodulator.
..."


Better FM demodulator:
http://www.dsprelated.com/showmessage/50153/1.php
Citat: "...
You will not outdo a standard analogue PLL with low phase noise in the  
VCO in a hurry.Why go digital when there is a perfectly cheap analogue  
solution?
..."


Grov sammenligning:

Generelt bruger SDR mere strøm end analoge AM og FM radioer.

/Glenn

<snip>  

Tak.



I "manualen" til DAB+/FM radioen - der har indbygget batteri, der
oplades gennem et USB kabel - oplyses 22 timer for FM og 8 timer for
DAB+ med note om, at de 8 timer DAB+ kan variere med signalstyrken.

Men ikke denne variation ved FM?

On 01/01/13 18.01, Axel Hammerschmidt wrote:


Hej Axel

Den længere driftstid ved FM tyder på, at det dekodes analogt i din radio.

/Glenn

Glenn wrote:




Klip <en hel masse yderst interessante links>

Ih du milde, jeg bliver helt svimmel over den ladning info du sender  
mig! Super, tak for det.

Men det tager nok noget tid før jeg får pløjet mig igennem det :-)

(Svar sendes til news://dk.teknik.elektronik )

On 03/01/13 23.50, Martin Larsen wrote:


Hej Martin

Her er en god SDR-omtale mere (YU1LM):


HF DC (direct conversion) receivers:
http://yu1lm.qrpradio.com/dc%20rx%20yu1lm.htm

Renaissance of HF DC (Direct Conversion) receivers Part1 (engelsk):
http://yu1lm.qrpradio.com/Renaissance%20of%20HF%20DC%20RX%20YU1LM.pdf

HF SDR (Software Defined Radio) receivers:
http://yu1lm.qrpradio.com/sdr%20rx%20yu1lm.htm

/Glenn

On 27/12/12 23.18, Martin Larsen wrote:


Hej Martin

Kig også på:

Den eneste kvindelige elektronik-geek jeg er stødt på og som accepterer  
et rodet skrivebord og hjemmelavede antenner. ;-) Og hun ved hvad hun  
snakker om og er rimelig pædagogisk:

Software Defined Radio VLOG Part 1:

http://www.youtube.com/watch?v=YFVgq3ZB0Mo


(Her præsenteres også et ægte gitterdykmeter med elektronrør:)
Software Defined Radio Vlog - Part 2:

http://www.youtube.com/watch?v=nTj_KvBuRmg


Software Defined Radio Vlog - Part 3:

http://www.youtube.com/watch?v=xVNgGJ7kcYs


Software Defined Radio Vlog Part 4 - Frequency Scanning:

http://www.youtube.com/watch?v=juyTihVP9sU


Software Defined Radio Vlog Part 5 - Baseband Capture and Audio Out:

http://www.youtube.com/watch?v=GRWVWD85tFQ


Software Defined Radio Vlog Part 6 - VGA and 256 Point FFT:

http://www.youtube.com/watch?v=Gdzenh3Fy-c


Software Defined Radio Vlog Part 7 - AM Demodulation and Floating Point:

http://www.youtube.com/watch?v50%tjWLiAkKw


-

Jeri Ellsworth:
http://en.wikipedia.org/wiki/Jeri_Ellsworth

Jeri Ellsworth youtube:



http://www.youtube.com/user/jeriellsworth



F.eks. lav dine egne transistorer:

Semiconductor:



http://www.youtube.com/playlist?list=PL5DCEA197C1C07A2D


Homebrew NMOS Transistor Step by Step - So Easy Even Jeri Can Do It:

http://www.youtube.com/watch?v=w_znRopGtbE


Make a Point Contact Transistor at home:

http://www.youtube.com/watch?v=vmotkjMSKnI


OA81 og OA90 kan f.eks. også anvendes.

-

Sep 01, 2004, Listening to FM Radio in Software, Step by Step:
http://www.linuxjournal.com/article/7505

/Glenn

Glenn wrote:



Hold da ferie, hun har godt nok hjernevindingerne i orden!

Spændende dame.