For Agenda rcs – 1705 2 rcs wrc –07 Agenda Item Scope and High-Level Work Plan1




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For Agenda RCS – 1705_2

RCS WRC –07 Agenda Item Scope and High-Level Work Plan1
Agenda Item 1.15: to consider a secondary allocation to the amateur service in the frequency band 135.7 137.8 kHz;
Background: Amateurs wishes to perform experimental communications in the135.7 137.8 kHz band segment. This spectrum is currently allocated FIXED and MARITIME MOBILE internationally and domestically. There are very few records (10) in the GMF in the subject frequency range. The UK currently allows amateurs to operate in this frequency range up to 1 Watt EIRP. Also, many other administrations have permitted experimental operation on a case-by-case basis.
The following background items are noted;

  1. International Amateur Radio Union (IARU) has identified a requirement for a worldwide secondary allocation to the amateur service in the low-frequency (LF) band (30-300 kHz).

  2. In the past ten years, more than 20 administrations have given domestic amateur radio allocations or have authorized experimental amateur service communications in the low-frequency range including 135.7-137.8 kHz

  3. Emissions carry Morse code

  4. Long wavelengths and equipment limitations constrain power output; efficiencies are typically no better than 1%


Scope of Agenda Item: The US should work with CITEL to develop regional positions and inputs for WRC-07. The implication of this secondary allocation is worldwide.
Key technical/regulatory issues to be resolved:
Impact of secondary allocation to Amateurs on the Fixed and Mobile primary services. By LF’s ability to propagate over long distances, interference potential must be considered carefully. The potential amateur emission must be analyzed to assess the possibility of interference to the fixed and maritime mobile services. The development of protection criteria for Fixed and Mobile Maritime Services is required to analyze the impact of the proposed secondary allocation to Amateurs.
Key policy issues to be resolved:

There are fixed service frequency records that show use of this spectrum. The GMF contains 10 records. The Navy holds one GMF record. The need exists to further determine if there are high priority communications in this band, and assess the impact of an amateur secondary allocation to current services.


Work Plan:


  1. Research GMF records, assess missions and usage.




  1. Submit to WP 9C and WP 8A technical papers on the affect of a secondary allocation in the 135.7-137.8 kHz band to the Fixed and Mobile services.




  1. Perform propagation assessment. Solicit support from WP-3L if needed.

  2. Investigate experimental uses of this band by Administrations vice allocation.

  3. Draft CPM text


Reference Material: Currently, radio amateurs are active in the band 135.7 - 137.8 kHz in more than 25 European countries. Note that in late 1997, the CEPT issued a recommendation (CEPT/ERC/REC 62-01) stating that the band 135.7-137.8 kHz may be used with a maximum e.i.r.p. of 1 Watt on a secondary basis by the Amateur Service in CEPT countries. Also, the European (Common) Table of Frequency Allocations and Utilisations (ECA) authorizes Amateur applications in the band under note ERC REC 62-01.

WG4 POC: Mr. David Pierce


1 Author: David Pierce Document Date: 3/25/04



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