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HP2DFA > NEWS 15.10.26 15:11l 72 Lines 3835 Bytes #999 (0) @ WW
BID : 4534_HP2DFA
Subj: RADIO ASTRONOMY WARNING FOR AMATEUR RADIO & ROADMAP TO WRC-
Path: DB0FHN<OE2XZR<OK1TOR<SR6DWH<SR1BSZ<EA2RCF<LU9DCE<VE3CGR<PI8ZTM<DM4RW<
HP2DFA
Sent: 261015/1302Z 4534@HP2DFA.#COL.PAN.CEAM BPQ6.0.24
RADIO ASTRONOMY WARNING FOR AMATEUR RADIO & ROADMAP TO WRC-27
SOURCE: BALTHASAR INDERMUEHLE (CSIRO / ITU-R WP 7D) / WIA
VALID: 16-OCT-2026 ONWARDS
ISSUED VIA BPQ32 NODE HP2DFA-5 IN PANAMA
======================================================================
1. INTRODUCTION & OVERVIEW
======================================================================
AS THE GLOBAL COMMUNITY PREPARES FOR THE 2027 WORLD RADIOCOMMUNICATION
CONFERENCE (WRC-27), EXPANDING SATELLITE FLEETS AND AGGREGATE UNWANTED
EMISSIONS ARE RAISING SERIOUS CONCERNS REGARDING THE FUTURE PROTECTION OF
RADIO SPECTRUM, INCLUDING ALLOCATIONS UTILIZED BY AMATEUR RADIO OPERATORS.
AN ITU ARTICLE AUTHORS BY AUSTRALIAN SCIENTIST BALTHASAR INDERMUEHLE (CSIRO
SPECTRUM MANAGER AND CHAIR OF ITU-R WORKING PARTY 7D) TITLED "RADIO ASTRONOMY
AT THE REGULATORY CROSSROADS: WRC-27 AND BEYOND" HIGHLIGHTS THAT SPECTRUM
CONGESTION THREATENS SCIENTIFIC OBSERVATION AND AMATEUR EXPERIMENTATION ALIKE.
======================================================================
2. SATELLITE PROLIFERATION & AGGREGATE INTERFERENCE
======================================================================
- TENFOLD INCREASE: ACTIVE LOW EARTH ORBIT (LEO) SATELLITES HAVE INCREASED
FROM ~1,500 DURING WRC-19 TO OVER 15,000 ACTIVE SPACECRAFT TODAY.
- FUTURE PROJECTIONS: ITU PROPOSALS POINT TO FUTURE CONSTELLATIONS TOPPING
100,000 ACTIVE SATELLITES.
- AGGREGATE THREAT: RECEIVERS NO LONGER FACE ISOLATED TRANSMITTERS; INSTEAD,
THEY MUST CONTEND WITH COMBINED UNWANTED EMISSIONS FROM THOUSANDS OF
FAST-MOVING SPACECRAFT OVERHEAD.
- THRESHOLD BREACHES: RECENT MEASUREMENTS DEMONSTRATE THAT AGGREGATE
UNWANTED EMISSIONS BREACH ESTABLISHED INTERFERENCE PROTECTION LIMITS BY
MULTIPLE ORDERS OF MAGNITUDE EVEN WHEN INDIVIDUAL TRANSMITTERS COMPLY.
======================================================================
3. AMATEUR RADIO SPECTRUM CHALLENGES
======================================================================
- MULTI-SOURCE INTERFERENCE: AMATEUR BANDS SUFFER FROM DEFECTIVE CONSUMER
ELECTRONICS, SWITCHING POWER SUPPLIES, SOLAR INVERTERS, BROADBAND
INFRASTRUCTURE, AND UNWANTED EMISSIONS FROM COMMERCIAL SERVICES.
- IMPACT ON WEAK-SIGNAL OPERATIONS: DIRECTLY HINDERS EME (EARTH-MOON-EARTH),
SATELLITE COMMS, MICROWAVE EXPERIMENTATION, AND LONG-DISTANCE HF DXING
WHERE ELEVATED NOISE FLOORS PREVENT SIGNAL RECEPTION.
- COMMERCIAL & REGULATORY PRESSURES: AMATEUR SERVICES MUST COMPETE FOR
SPECTRUM ACCESS AGAINST COMMERCIAL TELECOM AND SATELLITE CONGLOMERATES.
======================================================================
4. PREPARATIONS FOR WRC-27 & ADVOCACY IMPORTANCE
======================================================================
- CONFERENCE DATES: WRC-27 WILL TAKE PLACE IN SHANGHAI, CHINA, FROM 18
OCTOBER TO 12 NOVEMBER 2027.
- DECISION IMPACT: CONCLUDES BINDING REVISIONS TO INTERNATIONAL RADIO
REGULATIONS GOVERNING SATELLITE SERVICES, SPECTRUM SHARING, AND NOISE LIMITS.
- ADVOCACY ROLE: INTERNATIONAL AMATEUR RADIO UNION (IARU) AND NATIONAL
SOCIETIES (SUCH AS WIA AND ACMA) PROVIDE ESSENTIAL TECHNICAL EXPERTISE AND
ADVOCACY TO SAFEGUARD AMATEUR ALLOCATIONS AT REGULATORY TABLES.
======================================================================
5. KEY TAKEAWAYS & RECOMMENDED ACTION
======================================================================
- ALLOCATION VS USABILITY: AN OFFICIAL ALLOCATION IS VALUELESS IF AGGREGATE
NOISE PREVENTS PRACTICAL COMMUNICATION AND EXPERIMENTATION.
- COMMUNITY ENGAGEMENT: AMATEURS ARE ENCOURAGED TO DOCUMENT RFI, SUBMIT
TECHNICAL MEASUREMENTS, AND ACTIVELY SUPPORT IARU AND NATIONAL SOCIETY
REGULATORY ADVOCACY.
OFFICIAL SOURCES & LINKS: ITU.INT / IARU.ORG / WIA.ORG.AU
NODE CONTACT MAIL: HP2DFA@GMAIL.COM / HP2DFA-5@BPQ32
73 DE HP2DFA-5 / BPQ32 NODE PANAMA
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