TNAG-2148-FCO40-3067-Communication-systems-allocation-of-call-signs-to-Hong-Kong-1990 — Page 52

RA RADIOCOMMUNICATIONS

AGENCY

Ms P A Major

Hong Kong Department

Foreign & Commonwealth Office

London SW1A 2AH

ARC193/1

Waterloo Bridge House

Waterloo Road

London SE1 8UA

Switchboard (01-) 071-215 5000

Telex 261969 DTIWBH G

Fax (01-) 071-928

5746

10

Chazer

ADR

то ни

воины

for for 617

--- 1990

Direct line 071 215 2104

Our ref RU/309/IF

Your ref

Date 6 June 1990

2292.

Dear Ms Major

HONG KONG ALLOCATION OF CALL SIGNS

-

Thank you for your minute of 22 May concerning the allocation of call signs to Hong Kong. I have little to add to my letter of 6 July and the views expressed in that letter remain unchanged.

However, I would like to clarify para 7 of your minute particularly in respect of the number of call signs that can be manufactured from a single "root". As far as Hong Kong registered vessels are concerned, it is possible to make up 260 call signs from each root. For example, VPB can be used to form 26 call signs VPBA-VPBZ and a further 234 call signs VPBA1, VPBA2, etc through VPBZ9. I note also that on the first page of the attachment to your minute VRHA-VRHZ is not shown. This may be because Hong Kong uses VRHAA to VRHZZ for aircraft call signs but there is no reason why VRHA-VRHZ should not be used additionally for ship call signs.

There should be no problem in the future in forming aircraft call signs; VRHAA to VRHZZ produces 676 call signs, VRIAA to VRIZZ would produce a further 676, VRJAA-VRJZZ would produce a further 676 etc and there would be no clash with the 4-letter or 4-letter plus digit ship call signs.

There should be no problem in forming further amateur call signs.

I have annotated the attachment to your minute (in manuscript) to illustrate some of the above points.

I still prefer option III; this would cause little or no disruption.

Yours sincerely

Mike Kenyon

M W Kenyon

Room 804A

to N Whitney Esq

CAB HK

cc: Ms Walsh and Messrs Pullen, January, Barton, Wholmersley. This infact goes

I week.

The Radiocommunications Agency is an Executive Agency of the Department of Trade and Industry

even further han

feleletter a 22

my

May

and suggests that one

Series would suffice.

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