TAPR-MVUS-Presentation.ppt

1、TAPR:Tomorrows Ham Radio Technology Today,John Ackermann, N8UR Tucson Amateur Packet Radio, Inc.,Who am I?,A ham for 25+ years (ex-AG9V, WB9OWI) A lawyer by trade, working for NCR Corp. Active in DXing and Contesting, but became interested in packet radio, joined TAPR, and never looked back Board me

2、mber and VP since 1995 Elected President in 2000 Contact Information: or 01 937 445-2966,What is TAPR?,Founded in Tucson, Arizona in early 1980s; quickly became an international organization Today, over 2000 members worldwide Contact Information:8987-309 E. Tanque Verde RoadTucson, AZ 85

3、749-9399 USA01 940 383-0000,Previous TAPR Projects/Products,TNC-1 - the project that started it all TNC-2 - the “standard” TNC OEMd by AEA, MFJ, PacComm, and others TrakBox (satellite antenna tracker, with AMSAT) DSP-93 (early DSP modem) 9600 Baud Modem Many Others,TAPR

4、 Today,Focused on “Enabling Technology” Tools that let hams continue to be on the leading edge Major Projects: FHSS Spread Spectrum Radio Software Defined Radio PIC-based Project Kits Co-Sponsor (with ARRL) of the annual Digital Communications Conference,Current Products,PIC-E - Universal Packet Rad

5、io Encoder T-238 - One-Wire Weather Station Compact Flash Adapter II Totally Accurate Clock METCON-2 - Universal Remote Control/Sensor EZ-Trak - New Generation Satellite Antenna Tracker,Books and Publications,PSR - TAPRs Quarterly Journal DCC Proceedings Wireless Digital Communications: Design and T

6、heory by Tom McDermott, N5EG Networking Without Wires: TCP/IP over Amateur Radio by John Ackermann, N8UR Spread Spectrum Update edited by Greg Jones, WD5IVD and Steve Bible, N7HPR,TAPRs Online Presence, Mailing lists: (APRS) (Packet Networ

7、king) (Spread Spectrum) Many, many others File Downloads APRS software, etc.,What Is a Software Defined Radio (SDR)?,Performs the majority of signal processing in the digital domain using programmable DSPs and hardware support, but some signal processing is still done in the analog

8、domain, such as in the RF and IF circuits.,What Is a Software Radio (SW)?,The ultimate device, where the antenna is connected directly to an A-D/D-A converter and all signal processing is done digitally using fully programmable high speed DSPs. All functions, modes, applications, etc. can be reconfi

9、gured by software.,Why Software Defined Radios?,Dale Hatfield, WIFO, Chief, Office of Engineering and Technology, Federal Communications Commission “This could stimulate a whole new generation of amateur innovation that not only includes the more spectrally efficient systems I mentioned earlier, but

10、 also radios that could adapt to their environment as well.” Speech to AMRADs 25th Anniversary Dinner June 17, 2000 /Speeches/misc/dnh061700.html,Benefits of SDR,Flexible Reduced Obsolescence Enhances Experimentation Brings Analog and Digital World Together,New Breed of Radio,Reprog

11、rammable Multiband/Multimode Networkable Simultaneous voice, data, and video Full convergence of digital networks and radio science.,Block DiagramSoftware Defined Radio,VariableFrequencyOscillator,LocalOscillator(fixed),Antenna,BandpassFilter,RF,IF,Baseband,ADC/DACDSP,Block DiagramSoftware Defined R

12、adio,LocalOscillator(fixed),Antenna,RF,IF,Baseband,DSP,ADC/DAC,Block DiagramSoftware Radio,Antenna,RF,IF,Baseband,DSP,ADC/DAC,Looking Ahead,Smart Radios that configure themselves to perform the communications task requested (using different frequency bands, modes, etc.) Cognitive Radios that learn a

13、bout their environment (e.g., other users nearby, interference, location, elevation) to optimally configure themselves to maximize efficiency and reduce interference.,Technical Challenges,Dynamic Radio ADC/DAC Speed Smart Radio Algorithms,How to Build a SDR,DSP-10 by Bob Larkin, W7PUA QST - Sep, Oct

14、, Nov 1999 /tis/info/vhfproj.html R2-DSP by Rob Frohne, KL7NA QST - Apr 1998 /frohro/R2_DSP/R2-DSP.html A Panoramic Transceiving System for PSK31by Skip Teller, KH6TY and Dave Benson, NN1G QST - Jun 2000 /tis/info/psk31.html (see also the new 80M

15、“Whistler” radio by the same folks),The DSP-10 As a SDR,DSP-10 Constructed byErnie Manly, W7LHL,Analog Devices EZ-Kit Lite,Speaker,Serial Data,to PC,1024 Points,Audio,Power Amp,IF Amp,50 dB,ANT or,XVRTR,R,T,R,T,143 - 149 MHz,150 MHz,2-Pole,LC Filter,Low-Pass,Filter,40 dB,Transmit,RF Amp,Receive,RF A

16、mp,32 dB,143 - 149 MHz,19.665 MHz,First,Mixer,(U3),Second,Mixer,(U15),28 kHz,Low-Pass Filter,4-Pole,Crystal Filter,4-Pole,LC Filter,TR,SW,(U11B),U109B,Q5,Q6,IF Driver,TR SW,(U12A,U12B),Microphone,R,T,T,R,R,PTT,CW Key,10 MHz,Ext. Ref.,(Optional),10-20 kHz,J212,J213,J211,J102,J103,J201,J204,Receiver S

17、econd IF,10-20 kHz,Single Yagi, 150 Watt 2-Meter EME QSO W7SLB and W7PUA demonstrated a QSO on 2-meter EME, using the PUA43 mode of the DSP-10. Single Yagis and transmitter powers of 150 Watts or less were used on both ends of the contact. Details are available on the weak signals page and the linke

18、d text.,QRP 5-Watt 1296 EME QSO On 25 February 2001 Ernie, W7LHL, and Larry, W7SZ, were successful with a PUA43 mode QSO on 1296 MHz EME (Moon bounce). They were using a QRP power level of 5-Watts and backyard TVRO dishes of 10 and 12 feet. Copy was Q5 as can be seen on the screen at the left (click

19、 on it for a bigger version). They were using a 28 character setting on PUA43 (see below for more information on the PUA43 mode). The extra characters were being used for redundancy in portions of the message. The message would begin to appear in a few minutes, but Q5 copy was taking roughly 15 to 3

20、0 minutes per message. They exchanged call signs, grid squares, and confirmations both ways. Copy at W7LHL was not quite as good as for the other direction, but both stations received a complete message in the 28 characters. This was their first attempt at using the 5-Watt level for a QSO. As was reported earlier they had been successful at higher power during January. None of those involved are aware of any previous 5 Watt 1296 MHz EME QSOs although this may well have been done using larger antennas. Any information on this