(9) Frequencies for Hawaii Radio Systems. During the interim and the early part.of the build-up period, operation of the single-sideband system was hampered by lack of suitable fre- r quencies. During the early morning hours, none of the assigned frequencies were usable. This condition was alleviated later in the period when the annual change in propagation factors made the assigned frequencies usable. At the same time, u ample complement r of frequencies was available’for the single-channel radioteletype circuits to Hawaii, none of which were authorized for single sideband use. Therefore, it was not possible to utilize the conven-” tional method of operation wherein a single channel radioteletype signal is used as a pilot for the single sideband circuit in order to make advance determinations of frequency usability in connection with the frequency-change schedule. Authorization of one group Of frequencies for both single sidetand and radioteletype service would have improved operations in this respect. r (10) Transmitter Frequency Control. Because the JTF SEVEN Frequency Plan was not issued until quite late, it was not possible to initiate timely crystal procurement. Therefore, several important nets were without crystals as the operational date ap+ preached, Exciter units C-39/TRA-7 were used to provide frequency control for transmitters in these nets, with conplete success. f, Joint Relay Center operations were complicated by the use of three different routing indicators, each of which was used in working with one of the tkree najor relay centars to which conncct- d. Thue, in-working with ”RUHP,the rela~mntem , ueed routinti