Telecommunication.
CONDITIONS.
[CAP. 106
1. Radiotelegraph Conventions.-The licensee shall observe the provisions of the Telecommunication Convention 1947, and the G.N.A. 75/51. Radiocommunication Regulations annexed thereto or those of any subsequent International Convention and Regulations which may replace them so far as they are applicable to amateur stations.
2. Power and Frequencies.-Messages shall be sent only on frequencies within the bands and by the types of emission specified hereunder and the total D.C. power input to the anode circuit of the valve or valves energizing the aerial shall not exceed that shown against the respective frequencies.
Power (in watts)
Frequencies (in kilocycles per second) Types of emission
The use of "spark" sending apparatus is specifically forbidden. Unrectified alternating voltage shall not in any circumstances be employed for the H.T. supply to the sending apparatus, and the H.T. supply shall be so smoothed that the value of the residual ripple voltage does not exceed 5 per cent of the D.C. voltage.
3. Frequency Control and Measurement.—When in use, the sending apparatus shall be tuned to a frequency within an authorized band, which frequency shall be so selected and maintained that no appreciable energy is radiated on any frequency outside the limits of the band with or without the modulation applied due allowance having been made for the inaccuracy of the calibrating device. A satisfactory method of frequency stabilization shall be employed in the sending apparatus.
Where the sending apparatus is not crystal controlled there shall be kept at the station, and used whenever necessary (and on all occasions when the frequency used for sending is changed), a reliable frequency meter of the piezo-electric crystal type or other type approved by the Postmaster General, for measuring the sending frequency to an accuracy of not less than ±0.1 per cent. Where the sending apparatus is crystal controlled the use of a separate crystal frequency meter as a calibrating device will not be compulsory, but a reasonably reliable frequency meter must be provided for checking that the sender is operating normally.
4. Operator.-The apparatus must in all cases be operated by or under the direct supervision of
5. Sending Periods.-The station may be operated at any time, provided that no period of sending shall exceed 10 consecutive minutes. Sending shall not commence without listening on the frequency which is to be used in order to ascertain, as far as possible, whether interference is likely to be caused thereby with any other station which may be working.
6. Log.-A running record shall be kept in a book of approved type (not loose-leaf) of all sending periods showing the date and time of each period and the frequency and type of emission employed (see condition 2). No gaps shall be left between entries in the log. The record of sending periods shall in all cases be initialled at the time of recording by the authorized operator named in condition 4.
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