600 METERS and DOWN A New ham band? - Nashoba Valley ... · 600 METERS and DOWN A New ham band?...
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Transcript of 600 METERS and DOWN A New ham band? - Nashoba Valley ... · 600 METERS and DOWN A New ham band?...
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The Resource
✦ 600 Meters – 500 kHz
✦ 1906 Berlin Convention
✦ Maritime International Distress Frequency
✦ 495 – 510 kHz
✦ Replaced by Global Maritime Distress Signal System GMDSS
✦ By 1990’s most CW activity ended
600 Meter Band Location
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✦ Mid-way between 2200 m and 160 m
✦ Unique noise and propagation
✦ Superior ground wave coverage
Ground Wave Coverage
✦ 50 Foot Monopole, One Watt
✦ 0.01 S/m Ground
✦ 100 to 300 KM Ground Range (Daylight)
✦ Ionosphere Independent 5
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Proposed 600 Meter Band
✦ 495 to 510 kHz✦ Ultra-reliable Ground wave
Communications✦ Unique Propagation and Noise Environment✦ Experimental Work with Antennas,
Modulation Techniques, and Signal Processing (DSP)
✦ High Efficiency Transmitter Development
WD2XSH: The ARRL Experimental Program
✦ Use a Group Of Part 5 Licensed Stations to Demonstrate– Usefulness Of 600 Meter Amateur Band For
◆ Emergency Communications Potential
◆ Technology Development
– No Interference to Other Services
– Interest in MF Communications
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The WD2XSH Experimental License
✦ 17 Stations Currently Active
✦ 505 to 510 kHz
✦ CW only including QRSS
✦ 20 Watt Max. ERP
✦ Two Year Term (9/06 to 9/08)
✦ Station Activity Reports Required Monthly
✦ Quarterly and Final Report9
Progress to Date
✦ Over 9200 Transmitting Hours
✦ Almost 4000 Reception Reports Filed
✦ About 100 Two Way QSOs
✦ 17 Stations Active
✦ 100 to 300 Mile Radius Ground Wave Coverage Demonstrated
✦ Some Stations Have Been Heard (seen) in Europe and Hawaii and Much Trans Continental DX Recorded or Worked
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Other License Restrictions
✦ Only Contacts With Other Part 5 Stations
✦ No Cross Band Contacts IE to Part 97 Stations– Contacts have been made to other part 5
stations and one to a 2200 meter station.
✦ Fixed Station Operation Only No Portable or Mobil Operation
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Other Developments at 600 Meters
✦ Four European Countries Are Now On◆ UK, Sweden, Germany, Czech Republic
✦ Request For Additional Stations To Be Added to WD2XSH License
✦ Digital Modes Authorization Soon
✦ Request US Stations Be Authorized to Work Other 600 Meter Stations
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So What Do You Need
✦ An Antenna
✦ General Coverage Receiver (Most cover 500 kHz)
✦ Pre Amp, Filter, Converter
✦ Computer With Sound Card
✦ Radio to Sound Card Interface
✦ WEB Access to Send Reception Reports
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OK, Let’s Get Serious
✦ Receiving Loops
✦ Active Antennas
✦ EWEs, Flags, Pennants
✦ Long wires
✦ Low Band Dipoles
✦ Anything Else
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What Is QRSS?
✦ Very Slow Speed CW
✦ A Dit May Be between 3 Seconds and 120 Seconds Long
✦ Very Narrow Band Width To Dig Signal Out of the Noise
✦ Uses Computer Software and Sound Card to Process Receiver Audio.
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Flash
✦ Six New Stations Licensed
✦ WE2XGR/1 to /6
✦ 505 to 515 kHz
✦ Five Year License Term
✦ NY, CT, MA and NH
✦ 200 Watts ERP
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QUESTIONS?
✦ References
✦ Web < www.500kc.com/
The ARRL 500-kHz Experiment: WD2XSH, QEX, July/August 2007
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Low MF Spectrum Use
✦ NDB non directional beacon
✦ DGPS, HA-DGPS differential GPS
✦ NT NAVTEX
✦ MT marine telegraph
✦ MTDC marine telegraph distress/calling24
WD2XSH the ARRL Experimental Program
✦ Part 5 license
✦ What is a part 5 license
Part 5
Part 15
Part 97
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