57 



been transmitted so that no delay was occasioned in the schedules. 

 This break was repaired during the night and the transmitter was 

 in commission for the morning schedules. It is believed that this 

 accident was due to the lock nuts having worked loose, allowing 

 too much play between the contact points. 



During the morning of May 31, the power amplifier plate by-pass 

 condenser was punctured, causing a delay of about one hour in the 

 morning schedule before the trouble was traced and the punctured 

 condenser replaced by a spare on hand. This trouble was believed 

 to be due either to overloading of the transmitter or to a defective 

 condenser. 



On June 4 the master oscillator grid condenser was punctured. 

 The trouble occurred after the traffic to NBD had been transmitted. 

 The transmitter was in commission for the morning schedules. The 

 puncture was evidently due to one of the 1-kilowatt power amplifier 

 tubes becoming defective. It was noted before the condenser punc- 

 tured that one of the tubes had heated up more than the other. The 

 defective tube was replaced by a spare one. 



Approximately 176,000 words were transmitted and received dur- 

 ing the patrol, and the transmitters were in continuous operation 

 78 per cent of the entire time. Static was responsible for the failure 

 to receive special weather bulletins on five occasions during the cruise 

 and the failure to receive press on six occasions. 



Owing to adverse atmospheric conditions prevailing during the 

 cruise, only fair results were obtained on the 50-watt tube transmitter. 

 Station IBQQ (Mansfield, Mass.) was communicated with on 3 nights 

 and about 30 messages were handled. Coast Guard vessels off New 

 York were heard on ICW almost nightly, and NIL (the Coast Guard 

 destroyer Cummings) was copied plainly one night by phone. At- 

 mospheric conditions caused the schedule with NKF (Bellevue, 

 D. C.) to be abandoned, NKF being unable to hear the patrol vessel 

 although the patrol vessel could hear NKF. 



SIXTH CRUISE, JUNE 8-24, "MODOC" 



No difficulties were encountered with the set during the entire 

 patrol. Official traffic was routed to Bar Harbor via the Tampa at 

 Halifax, except on the evening of June 22 when it was impossible to 

 establish communication with either Bar Harbor or the Tampa, 

 due to bad atmospheric conditions. On this occasion the traffic was 

 routed via WCC (Chatham, Mass.). This message was the first 

 official message to be sent via WCC during the patrol. It was again 

 necessary to use WCC on June 23 in getting the Saugus report to 

 headquarters. 



