cooperation and could have been completely nullified in the absence of this spirit. . A list of the circuits and channels operated is ap- d. pended.24 Certain of these were not entirely within the joint facilities. This was true in the case of the circuits operated fron PARRY Island by the ‘*irForce and Navy, wherein the transmitter and facilities control functions were part of the joint facility but the receivers and operating positions were individual service responsibilities. The same thing was true of the voice and CW airways circuits to KWAJAIEIN and the HI?aircraft control circuits at the AOC. In all of these, the using agencies preferred local receivers because of a requirement for frequent retuning when operating with distant stations using field, airborne or shipboard equipment of low frequency stability. e. Technical difficulties were encountered in the operation of certain circuits. The principle difficulties and their solutions are discussed below, Other technical points of interest are also included. (1) Mdticbnnel radio system to the ~S WT~. The primary facility for this system used the T-276 500 watt single sideband transmitter, AN/FRR-40 receiver, modified CF-1 carrier equipment as channel shifters and restorers, and AN/FCC-3 telegraph carrier~ It had been intended to operate this system on frequencies in the 2 to 3 megacycle range, with vertical antennas, in order to gain the advantages of ground wave propagation; however, high noise and interference levels on the USS ESTES and the interference of the 2 to 3 megacYcle 24- TAB W 74 . . . -