YOUR LETTER OF 2 JUNE RE TERMINATING UNITS FOR WAVE ANTENNAE

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03097A000200020217-3
• Release Decision: RIPPUB
• Original Classification: R
• Document Page Count: 2
• Document Creation Date: December 21, 2016
• Document Release Date: December 8, 2008
• Sequence Number: 217
• Publication Date: June 15, 1948
• Content Type: MEMO

Approved For Release 2008/12/08: CIA-RDP78-03097A000200020217-3
Assistant Chief. Mediterranean auras'
Chief, 7913
Tour Letter of 2 Alas re Terminating Units for avs Antennae
16 Arno 126111
1. Procurement of transformers for the Deversee Wave Antennae of ell
of our now stations has reached en advanced stags. The transformers under procure-
ment are very similar to those you requested per memo dated 2 Awe 1942.
2. The following variations in design are palate& out so that YAW
antennae will be built to match the standard transformers.
a. Transformers are built to acconodate a 28 tech spacing of the two
wires of the antenna. Pasteaing the wires on the inside of the
Pow, trPe insulators mounted on pins spaced 30 lashes on the cross
are furnished will give you the desired spaeln46
b. Pols and cross arm construction should be such as to place the
two wires of the wee antenna 16 1/2 fest above the dream& level.
e. .10 copper wire was assumed ia the oalculatioa of the transformer
impedances.
d.
?eflection transformers are included for all rave eatennaeo whether
lr not a particular antenna is to be for *mi. or bi.direstiomal
reeeptioa. Knee it is usmally difficult to Okla a, lev rosistamee
ground, particularly whore surface conditioas are by and rocky,
better overall mopes'se from the matinee is eXPerlcomea vbei
reflation transformer, are used. Teo oftem radial grenade become
dry and act more like a eapaeity than a. low resistamee. The lanJar
disadvantages of Vie are overcome byes* of a reflection transformer.
is. Gravid cos:sections from transformers to radial grenade will be made
by using a plow of36-12iLseble with n'PrePrIcti, fittifts to
match Amphemel 96-12 fitt on the transformer ease. This feature
will prevent downloads from acting as omaidirmational antennae to
partly nullify directional characteristics of the wave antenna,
The lighting arrestor end transformer case will be connected to
the outer shield of the 0.12/U elan and the regular demised mmi
electrostatio shields will be connected to the inner sondacter.
f. leash near and transformer case will be fitted with One lad eal,
navy Type 1/11.491667 and one threaded stud and cap. Per ettachment of
second and seal, the cap is unscrewed and the end seal attached.
STAT
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Approved For Release 2008/12/08: CIA-RDP78-03097A000200020217-3
Approved For Release 2008/12/08: CIA-RDP78-03097A000200020217-3
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g6 The has impeders* of the transformers maim presurmsest is MO
ohms and the termination im2sdasee le 260 ohms, The Wallas* if
%floatage for attachment to V.22/U sable Is 72 ohms,
24, weatherproof cases are provided on all transformers. 2oth relestIom
and near fowl transformers have lightning arrestor gAps. The range of the tram*.
formers is 200 to 2000 loos,
, 4, /a amajnmetien with this project on are being furnished .it kits
(MK4) for modification of VI1650271, antenna melticonplers tat use es meatus
M& Ismg vava-reAgli 200 to 2000 iroe, ispedanna 15 ohms,
5, Two additional Navy TIT* liw442151f emd seals, ten adapter UT' type
Rws491680 and fifteen 75 Om, 2swatt resistors will be sblpped as goorn as tbar
are premixed, This is ia additims to the sight Isrisstias trissremsrs sad sight
seersend combination transformers (with one end seal *ash). There mar be a
seasiderable delay' in delivery of the 2WAS1222 adopters as the WsTY is sst or this
item now.
brig
X. Win
?eery no
Approved For Release 2008/12/08: CIA-RDP78-03097A000200020217-3