SECRET

Dutch Harbor, Alaska
   January 5,1942.

From:	Radioman in Charge
To  :	Commandant Fourteenth Naval District.
Via	Commandant Thirteenth Naval District.
Subject:	HF D/F Radio Intelligence Report.
Reference:	(a)	Com14 SECRET ltr.,Z-2051 Dated 6 Oot.,1941.
Enclosure:	(A) Bearings of Orange Navy Ships and Stations.
	(B)	Report of FLASHES received.
	(C)	Garble Table worked out By Taris,C.M.RM1C.

      1.      Radio Intelligence Report forwarded Herewith in compliance with reference (a). This report consists of four (4} pages.

      2.      It is hereby certified that the originator considers it to be impracticable to phrase this document in such a manner as will permit a classification other than secret.

R.J.Fox

Copy to:
Com13
OpNav.
File.

SECRET

1 Dec. 1941 to 1 Jan.1942.

Station K PERSONNEL 

FOX, R.J. CRM "FX"
Married-living on Main Radio Station
QUALIFICATIONS- RI-completed training course in Orange work at Station "S".

HESS, F.W. RM1c "BY"
SINGLE-living at Aerological Station.
QUALIFICATIONS-one and one-half years HF D/F at
Station "S".

GILMORE, T.E. RM1c "TG"
SINGLE-living at Main Radio Station.
QUALIFICATIONS-one and one-half years HF D/F at
Station "S".

HOOD, H RM1c V-3 USNR "HH"
SINGLE-living at Main Radio Station.
QUALIFICATIONS-RI-completed training course in
Orange work at station "S".

TARIS, C.M. RN1c V-6 USNR "TS"
SINGLE-living at Main Radio Station.
QUALIFICATIONS-RI-completed training course in
Orange work at station "S".

Fox,R.J. CRM           15 WPM.
HESS,F.W. RM1C         12 WPM.
GILMORE,T.E.RM1C       12 WPM.
HOOD,H. RM1C           17 WPM.
Tarie,C.M. RM1C        19 WPM.

SECRET

1 Dec. 1941 to 1 Jan.1942.

Station K	OPERATIONS
1.	ASSIGMENTS.
	COMBINED FLEET
	4030-8060-8820-11640-5970-6480-6775.
	UNIT COMMANDERS.
	4310-8620-4650-6775.
	SUBMARINES.
	Comsubron One - 5640. Comsubron Two - 5275-5970-5640-6100-6390-12772.
	AIRCRAFT
	Comairron One - Comairron Two - 5275-5970-7650-9490.
	AIR FREQUENCIES.
	6200-6550-7855-7920-9835.
	MANDATE FLEET
	6600-6700-7655-8930-9085-9770-10720.
	NORTH,CENTRAL,SOUTH CHINA FLEETS.
	4500-5500-5685-6270-11370
	DETACHED VESSELS.
	6150-12250.
	COMMERCIAL MARUS
	6200-6250-7900-8210-8270-12400

(2)

1 Dec. 1941 to 1 Jan.1942.

SECRET

 OPERATIONS CONT 

Station K 

1.

During the major part of December this station was operating under the flash system controlled by Radio Honolulu. Due to very weak signals and interference on 8010 kos,from stations PKD and VHN working ITEM schedules, many of the flashes were missed. The frequency 12150 KCS is very poor at all times with signal strengths varing between 0-1 and 0-2. Japanese and Russian stations also working on this frequency.        The schedules being held with NPM for clearing Priority traffic from this statloa have proved very unsuccessful. Radio Honolulu signals vary from 0-1 to 0-2 most of the time. On a few occassions when contact was made on 7995 KCS, Radio Honolulu refused to take our traffic due to the fact that all transmissions on that frequency are to be authenticated. This station has no information on such authentication, nor any information concerning the procedure for its use. It is requested that such information be forwarded.        On several occassions the Commanding General at Fort Mears, Dutch Harbor, Alaska, has received information that Japanese vessels were operating in the vicinity of this area and that suoh information was obtained from radio bearings obtained by their stations. Such information was passed on to the Commanding Officer of the Naval Air Station, Dutch Harbor, Alaska, who in turn further passed the information on to the Radioman In Charge, requesting that suoh matters be looked into and checked. It is therefore assumed by the Radioman in Charge, that the U S Army is conducting a High Frequency Direction Finder Net similar to our own. That they are passing on such Information to various Naval Sources. Also that such Army despatches are being seen by various members of Naval coding boards and that by putting two and two togeather they would be right in assuming that this station is performing the same kind of work. It is requested that information be made available to the Radioman In Charge, as to just how far he should go in cooperating with such requests or whether to continue operations under the present flash system and have such information come from higher authority.

(3)

1 Dec. 1941 to 1 Jan.1942.

SECRET

OPERATIONS CONT

STATION K

       2.   From a rough tabulation of results obtained since the commencement of coordinated tracking operations, it was found that about thirty percent of the flashes bring results. The remainder of the flashes are on signals that cannot be heard at this station at the time of flash. From eight December to twenty five December inclusive, Fortythree out of a total of Two Hundred Sixty Six flashes (That we know had been sent) were missed. This was due to Radio Honolulu's weak signals, Fading and Interference. No doubt many other flashes were not heard at all.

            Independent searching on frequencies flashed at one time or another, and on frequencies assigned by Coml4 by despatch, have brought substantial results.

            Greatest inefficiency lies in the fact that Radio Honolulu's flashes cannot be heard dependably; and that they flash frequencies that we cannot receive at that particular time. Searching has proven that signals flashed the first time on a particular frequency, and which are unheard at this station, come up again about four or five hours later on the same frequency with a signal strength of five at this station.

            The following information is forwarded with a hope that some series of frequncies can be chosen wherein flashes will become more reliable, although it is understood that what may be success for this station may prove a failure for other stations in the net.

            Signal strength of ships and stations, in which we are interested, are rarely above strength l-l/2 on the 3.5 to 5.5 MC band. From 0400 to 1000 GCT signals on the 7-14 MC band are strength 1 to 3. On the 5.5 to 7 MC band from 0500 to 1800 vary from s1 to s4. The frequency 16020 now being used by Radio Honolulu is strength five most of the time that that frequency is being used.