Inspection Report No. 3 - DF4(Classified)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-02820A001200050026-5
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: November 17, 2016
• Document Release Date: July 28, 2000
• Sequence Number: 26
• Publication Date: September 15, 1966
• Content Type: MF

App Ada or Release 200010&116 :CIA-OAQ01,00050026-5
99A.~,EN. RHO. NO. 27
m UNITED STATES GOVERNMENT
25X1A99ROM
Memorandum
The Files: Contract No. 4331, Task Order 1
me"
SUBJECT: inspection Report No. 3 - DF-4
1. Project Description:
The DF-4 is a small, automatic direction finder which will be
75 percent lighter in weight and 90 percent smaller in size than the
currently used DF-3. The DF-4 will operate from 0.5 to 20 Mc/s and
require five tuning bands to cover the frequency range. Directional
information will be provided on Band 1 for signal strengths from 20
uv/m to 1 v/m and on Bands 2 through 5 with signal strengths in the
range from 10 uv/m to 1 v/7m. Dual conversion will be employed above
t..8 Mc/s to maintain a high degree of image rejection (greater than
6o db). Audio output will be 2mW into a 1000 ohm load, and audio
distortion will be less than 10 percent from 300 cps to 3000 cps.
Dial frequency accuracy will be better than 0.3 percent and directional
accuracy will be within 5 percent. A 100 ke/s crystal calibrator is
used for Bands 1, 2, and 3; and a 1 Mc/s calibrator is used for Bands
4 and 5. The antenna consists of three ferrite core loop antennas
oriented 120 degrees with respect to each other. When the output
from the sense antennas are mixed, a cardiod antenna pattern results.
25X1A5a1
2. Contractual Information:
25X1A
a. Initial. Cost:
b. Request for Procurement Action: 16 November 1965
c. Initiation Date: 10 January 1966
d. Completion Date: November 1966 Extension: December 1966
e. Deliverable Items:. Two prototype DF-41s; engineering drawings,
final report.
3. Date of Meeting: 8 September 1966
4. Place of Meeting:
EP 66-204
DATE: 15 September 1966
25X1A
5? Persons Attending:
EMU 171V
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Appjoved For ReleasO 000/08/16 : C u2820A?91200050026-5
EP 66-2o4
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SUBJECT: Inspection Report No. 3 - DP-4 with 25X1A5a1
5. Persons Attending:
Agency Non-Agency
Mr.
25X1A9a Mr.
(Lab co-op student
Contractor's Performance:
a. On schedule and expected to remain so: Yes
b. Within obligated funds and expected to remain so: Yes
c. Satisfactory technical progress: Yes
25X1A5a1
7. Project Status:
25X1A5 exhibited a fully assembled DF-4. The unit was not
electrically operable because the various PC cards were not inter-
wired. An effort was made to get Band 1 working but this was not
accomplished prior to leaving the plant. In its final form the
DF-4 measures 9" X 8-1/2" X 3-3/4" and weighs 12 lbs. 14 ozs.
MEW About the only undesirable feature which exists and which
25X1A5a1 was instructed to eliminate is possible operation of the
battery charger when the Mercury battery is contained in the battery.
compartment. (The DF-4 is designed to operate with either a re- "
now chargeable Nicad or Mercury batteries.) A plastic "size reduction
liner is used when the Nicad battery is inserted into the DP-4.
When the Mercury battery is used the liner is stored in the battery.
' charger cord compartment.
The selected Mercury battery is a Mallory SR 3759 (13.5 Volts).
~r The battery which costs about $16.00 may be ordered direct from
8
Mallory using the Mallory number. The battery consists of ten 143
cells packaged in a cylindrical shape. One Mercury battery will
provide approximately 100 hours of continuous operation while the
Nicad will provide about 18 hours per charge.
vide abou
estimates one month . 25X1A5a1
eLr &a= For Release 2000/08 - .I z1;y A001200050026-5
...w 2
 Approved For Release.2000/0811
SttTECT: Inspection Report No. 3.- DF-4 with
25X1A5a1!
25X1A5a1 estimates one month. of work to wire and debug the two
DF-4's: In addition one month of environmental testing will also be
required. During the week of October 10 the DF-4's will be available
for field testing by SPS & OS in.the Fort Wayne area. Also, a lensatic
type compass was carried back and forwarded to SPS for inspection to
determine acceptability for use on the DF-4.
25X1A9a
25X1A9a
Distribution:
R&D Subject File
OL/PD/PCB/CAS
R&D Lab
.OC-OS
ESB
OC-SPS
Monthly (3)
EP Chrono
OC-E/R&:D-EP1 j ah
Approved For Release 2000/G i~l
r I
78-0282OA001200050026-5
EP 66-204
(15 September 1966)