JRC Technical Memoranda

Background

Over the years since the JRC was formed it has published various Technical Memoranda which form the framework of the spectrum management activities of the organisation. These memos cover all aspects of activity from fixed links through mobile radio to site safety.

Since much of this material was published a long time ago, it is often obsolete and in some respects niaive but there are some gems in there and the engineering is first rate.

A note on the file format of these documents: Most, if not all of the TMs in this collection are offered as Portable Document Format (PDF) files. The reason for this is primarily convenience rather than any attempt to make copying difficult. I don't have an electronic copy of most of these documents so I have had to resort to scanning the original paste-boards. It's faster to scan to PDF than OCR into HTML or some other editable text format and then try and make the document look right again. So that's why you'll probably need a PDF viewer to look at this stuff. If you wish, you can go to www.adobe.com and get a copy of Acrobat Reader that is suitable for your operating system. There are, of course, alternative readers for the Unix-like operating systems. These will all work well as the files have been produced using Acrobat 4.0 and are relatively simple in layout.

IMPORTANT NOTICE
A JRC Technical Memorandum is a statement of policy, procedure, or a set of guidelines that has been produced for the benefit of radio planning staff in individual JRC member companies. Memoranda pertain to Radiocommunications matters and are the result of careful technical consideration in the Operations and Strategy Groups of the JRC. The observance of these statements forms an integral part of the industry's self-regulation of Radiocommunications and are agreed as being in the best interest of the companies from which the Membership of the Joint Radio Company is comprised.

Chronological List (under development)

• »TM01 (1985)
  POLICY GOVERNING FIXED LINK FREQUENCY ASSIGNMENTS ABOVE 1000 MHz TO THE FUEL AND POWER INDUSTRIES
  [Word]
  The Department of Trade & Industry (DTI), Radio Regulatory Division (RRD) will consider applications from the Fuel and Power Industries for the licensing of fixed radio links for the purposes of conducting their business. The proposed systems must be based on operational requirements of the coal, gas and electricity industries. There are insufficient frequencies available to licence back up systems which would be used only in the event of the failure of existing methods.
  (OBSOLETE)
• »TM04 (1967)
  TERMS OF REFERENCE
  [PDF]  [Word]
  Terms of Reference of the JRC Main Committee.
  (OBSOLETE)
• » TM06 (1968)
  USER SPECIFICATION FOR THE INTERCONNECTION OF MICROWAVE SYSTEMS
  [Word 55kB]
  Concerning the interconnection of 1500 MHz fixed links between member companies.
  (OBSOLETE)
• » TM09 (1969)
  [JRC_TM09_1969.pdf] [JRC-TM09-1969.doc]
• » TM10 (1970)
  [PDF] [Word]
• » TM14 (1971)
  [PDF]  [DOC 1MB (OCR - poor quality)]
  A Guide to the Evaluation of Effective Radiated Power for Point to Point Radio Links in the 450 to 470 MHz Band.
  (OBSOLETE)
• » TM17 (1972)
  [1972 version: PDF]  [1980 version: PDF]
• » TM17 (1973)
  [PDF]
• » TM23 (1976)
  [PDF]
• » TM24 (1975)
  [PDF]
• » TM26 (1976)
  [PDF]
• » TM28 (1980)
  [PDF]
• » TM29 (1977)
  [PDF]
• »TM30 (1975)
  PROTECTION AGAINST LIGHTNING DAMAGE
  [PDF 750kB]
  JRC reminds users of the potential hazards of lightning and suggests some precautions that can be taken. (Current!)
• »TM31 (1976)
  HEALTH HAZARDS ARISING FROM THE USE OF RADIO EQUIPMENT
  [PDF 210kB]
  Clarifies the circumstances where a potential hazard may exist. This document shows that recent worries about RF emissions and health are not new. (Current!)
• »TM32 (1976)
  
  [WORD]
• »TM33 (1976)
  INTERCONNECTION OF MICROWAVE ROUTES USING 1500 MHz BAND "B" AND BAND "E" EQUIPMENT [PDF 500kB]
  This paper outlines the potential problems which may be met in interconnecting 1500 MHz "B" and "E" band microwave equipment without using intermediate translation to audio.
  (OBSOLETE)
• »TM34 (1976)
  SHARING OF PRIVATE RADIO STATION SITE FACILITIES
  [PDF 1MB
  Suggestions for agreeing the sharing of radio site facilities where they exist and in the development of new sites where required. This was produced in an effort to avoid the all-too-common situation where two or more sites were developed at the same location in ignorance of each other. This often caused delay and unnecessary cost to both parties.
  (OBSOLETE)
• »TM37 (1977)
  CORONA AND PRECIPITATION STATIC EFFECTS ON RADIO AERIAL SYSTEMS
  [PDF 1MB] [Word 1.1MB] Methods for minimising interference effects caused by corona discharge static on radio aerial systems.
• »TM38 (1979)
  THE USE OF VHF MIDDLE BAND RADIO FOR ALARM/TELECONTROL PURPOSES
  [PDF 85kB]
  Explaining the Home Office rules for assigning Alarm and Telecontrol stations in VHF Middle Band.
  (OBSOLETE)
• »TM86
  MOBILE APPLICATIONS PROCEDURE [PDF 1MB]
  Procedure to follow when applying to JRC for a PMR frequency assignment. Detailed rules and planning information with maps and channel plans.
  (CURRENT)
• »UK Thunder Areas
  [JPG]
  A map of the UK Thunder Areas as used in the fixed links planning process before 1995. (Who knows if it's still accurate).
• » Post Office Interference Branch Memos
  W2Memos - Some interesting Memos from a very old file found in the archives. These are memos from the Post Office Wireless Service dating from 1933 and cover EMC matters from everything from trolley bus motors to screened rooms and even an early assessment of a Theremin for interference potential. What's a Theremin, you say? Remember those SciFi movies of the 1950s? Remember that wierd wibbly-wobbly electronic music they always had? That's a Theremin playing that..

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