LETTER TO (SANITIZED) FROM (SANITIZED)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A000200020009-0
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 3
• Document Creation Date: December 22, 2016
• Document Release Date: August 11, 2011
• Sequence Number: 9
• Publication Date: August 26, 1955
• Content Type: LETTER

Sanitized Copy Approved for Release 2011/08/11: CIA-RDP78-03424A000200020009-0
N-2061-AIA-12-55
26 August 1955
25X1
ILLEGIB
Subject:
H-2061
Three (3) copies of the L _]revised technical proposal have
been forwarded to you. The draft of the sub- o et with 0 is nearing
completion. however, it is proposed to start working on the project
immediately on the supposition that approval be granted and that minor
discrepancies can be rectified while the work is progressing.
A study of the patterns of the NFL horns proposed for use on
this project brings to light the following information:
1. The a, t/'' band horn (I f'.L-RA66D4/+0) with or without aperture cover
will barely meet the beamwidth specification at the high
frequency end of the band for 6 db down.
2. The bands 3 and 9 URL horns (AT-513 ( -1)/AI and AT-630 (XB-1)
/ALR) without ground plane or in a cylinder whose diameter is
large coml:ared to the wavelength will also barely comet the
beamwridth specification at the high frequency end of the band
for 6 db down.
3. For a beamwidth 3 db down, the "Ln band horn is adequate only
at the low frequency end of the band and the high band horns
are adequate only over part of the frequency bands.
4. The high band horns have more than one nearly equal major lobe
over the frequency band. These may be due to reflections or
additional modes of operation. However? in the interest of
minimizing the antenna development works it is suggested that
the horns be used as designed by NFL an-0--'-hat Improvements of
beamwidth and of more desirable pattern shapes be made a subject
of future work. More details of apttern measuremento are given
in he Appendix.
The a'1 L horn drawing flA66D440 (4 sheets) was made available for
~ ? use in composing TP2.651, however, at the present time this drawing Is
unavailable. In order t: furnish 0 with the rnaximu:n Information, it is
requested that another copy of BA66D440 be
U
25X1
25X1
25X1
v
r1
CONFIDENTIAL
Sanitized Copy Approved for Release 2011/08/11: CIA-RDP78-03424A000200020009-0
 Sanitized Copy Approved for Release 2011/08/11: CIA-RDP78-03424A000200020009-0
CONFIDENTIAL
An investigation of phosphor types for the Tektronix oscilloscope
reveals that the P type is the most suitable. This type gives the --imum
brightness for manual viewing of pulses having fast rise time and for determin-
ing pulse width information. The PI type can also be photographed witiiout
smear by normal photographic mans, Other phosphor types are not skiable
because of lack of visual brightness at high writing speeds.
Information has beep obtained that the console unit and the
aurAliary equip>nrit will be mounted or a horizontal surface. Therefore, the
work toward sha4 mounting this equipment is going on under this supposition.
Very truly yours
of
cc:
QFDENTAL
Sanitized Copy Approved for Release 2011/08/11: CIA-RDP78-03424A000200020009-0
 Sanitized Copy Approved for Release 2011/08/11: CIA-RDP78-03424A000200020009-0
COQ' r a ~, RDE
L
NRL Barn DegmwidthM
"L" Band (66001_ horn
W.jth?ut Aper- with anerture
lure ever COY
6db
r au?nv 21art za on 3 db 6 db ; __b
1.100 N cert. 69? 103? 72? 102?
hor. 91 140 87 133
14,00 Vert. 75 101 71 108
hor. 79' 113
1800 Vert. 66 91 64 89
hor, 66 91_ 66 93
2200 Vert. 55 75 53 76
_S : hoc. 55, 75 53 76
rn
(L' - 13 [XB-1)/AIR Ho
'IL D
1,70 and. Mane 6 die. cyl. 45?
0 u?nc Pc~lar1zation 3, da c~h 6 c~
10.2 Kma vent. 68? 980 70? 1140
hor. 119 187 116 167
13.3 vert. 82 105 62 34
hor. 1Q66 135 90 ?38
16.7 vert. 54 80 51 77
bor. 99 124, .77 115
19.6 vert. 53 75 49 72
hoc. 8103 72 98
4T-.6630 '11/A 0r, n
Fol.{riation
Lac
21?fi a vert.
box.
25 var
hor.
~- A 29 vort.
hor.
34 verb;.
hor.
39 vent.
bor.
N? end. plane
db db
740 100?
118 9.,16
80 104
62 84
42 137
74 94
Ja3=--3.
64 85
4 76
CONFIDENTIAL
8f? clia. oyyl. X4.5?
6db
82? 112?
122 151
87 100
75 150
69 85
79 136
66 80
78 105
52 83
62 92
Sanitized Copy Approved for Release 2011/08/11: CIA-RDP78-03424A000200020009-0