THIS IS IN RESPONSE TO YOUR INQUIRY REGARDING THE EXISTENCE AND AVAILBILITY OF TRANSISITORS CAPABLE OF DELIVERING 5 WATTS OF RF ENERGY AT 30 MEGACYCLES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A000800010023-9
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 5
• Document Creation Date: December 22, 2016
• Document Release Date: February 8, 2012
• Sequence Number: 23
• Publication Date: April 16, 1959
• Content Type: LETTER

Declassified in Part - Sanitized Copy Approved for Release 2012/02/08: CIA-RDP78-03424A000800010023-9
CONFIDENTIAL
Central I
Yashingtaa "0 D. C.
P DOC V DATE 10 aR BY 3 f
ORiG COMP OPI TYPE
ORIG CLASS PAGES i7~ i eV CLASS
JUST Z -Z-- I REV ZOV AUTHI HR 10.2
This is In response to ' yo1Q iug5i&7 94WR aiaD thi (ezistiaas aM
availability bi n~is sa sa, !`_sar~!
?eas trsnsistsrs de slIst to a drvslop mental state. Semple snits
haw been dslinrst to R. D. Alberts, VrW Air Development Csatsr,
Vri*t.. attsrsea. Air Pores Dun,, Day ton, min, in oonsstisa nits err
bid for as estisssrias pilot has contract for these transistors. Samples
are also being seat to Mr. D. tsich, Chief, Circuit Prsntions Irsasb,
Solid State Dsvtoss Devoloplrt, WASMv Port Mo+oaoutk, 1sv Jersey, in
Zonnectisa pith a siailar aaat act bid.,
Infomn^atioa starling these transistors is not classifiet, aad ve
shall be Ala* to. sigply say infoastioa 'iah Moult be Mlpfol to you.
Tbass transistors are, is a Mvslop?astsl state. The necessary snpiassr-
ing to assns osatrollst stssastsristiss and Mood rsliabililW has not
been doss, ant its psrtaesrsas is dependent on Pacific ''s
success in biftili fir as stiaaratioasl soatraats.
their its ctsristi s mot.to treat" sa rr -
ame two 'tl mom me- 49 ~ real nalaas, a iMsilad intsrshawp at
technical lalyasl3._ ?Nratm.
23 S>79ORIGINAL CLOY
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~x7 et Iti~ :;k:'Y
REAO'.l
/pb
Siasirsl~r Ti's,
25X1
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Declassified in Part - Sanitized Copy Approved for Release 2012/02/08: CIA-RDP78-03424A000800010023-9
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/08: CIA-RDP78-03424A000800010023-9
Dear Don,
As you suggested in our recent telephone conversation, I am
enclosing a set of specifications for the type of transistor we would like
to have for the RT-21 output stage. These specifications were arrived at
after considerable discussion. In the interest of clarity, I feel a word
of explanation is indicated.
We have listed the various items under the headings of "minimum",
"average" and "maximum". By this we mean, except in the case of temperature,
the following. The number under "minimum" represents the value which we
feel is about the lowest which we could use advantageously. For example, if
the power gain is lower than 10 db it would take another power stage to drive
the output stage. The "average" figure represents what we would like, if
possible, either now or at some time in the future. By asking for a power
output of 10 watts we are probably extending pretty far into the future;
however, two 5 watt transistors in parallel would, for the present, be as
acceptable.
These specifications are not independent of each other. For instance,
in asking for operation into a 1000 A. load impedance, at a 10 watt power level,
we are implying a peak to peak voltage swing of nearly 300 volts. This is pretty
rough on present-day transistors! On the other hand, if you could supply a
3 watt unit, the peak to peak swing reduces to about 150 volts, which is
considerably more realistic at the present time.
We are looking forward to the first shipment of these transistors
any day now!
Very many thanks for your help,
Declassified in Part - Sanitized Copy Approved for Release 2012/02/08: CIA-RDP78-03424A000800010023-9
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/08: CIA-RDP78-03424A000800010023-9
Dlin.
Average
Max.
Power Output at 30 me
*
10
watts
Power Gain at 30 me
10
16
db
Output Impedance
500
2000
ohm
Output Capacitance Common Emitter
5
10
Load Impedance
same as output impedance
Ambient Temperature
_40
25
+40
oC
The maximum power that is available at this time at frequencies up to 30 mc.
Declassified in Part - Sanitized Copy Approved for Release 2012/02/08: CIA-RDP78-03424A000800010023-9
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/08: CIA-RDP78-03424A000800010023-9
G J N N F 1PENNT1AL.
HEADQUARTERS
V. S. ARMY SIGNAL RESEARCH AND DEVELOPMENT LA$ORATORY;,
FORT MONMOUTH. NEW JERSEY
y ?!I.? I!/[1! TO
pT, a
ti, jO Z Str?et, 1erUwSSt
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A000966 09PLY TO
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in aoaDltaatiee with the rersoSt cDntaiasd in 1?ttar t'wt tyls
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the sva2Ubillty of KF Powe.? TrsaslAtor 3aaplas, Aida Ll sS I
19 t:csing .four (I.) each PSI (70) aR, 1 M&tt twhtW deli '
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specs ftoations sad pacssotcls values .or nss M7 Tom
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1 watt d.vtsss (b M) Solid Mats Devtess XASUM
2. 8psaifLsat'Son
CON' I ULI"gq 6 i'L-
Declassified in Part - Sanitized Copy Approved for Release 2012/02/08: CIA-RDP78-03424A000800010023-9
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/08: CIA-RDP78-03424A000800010023-9
Ziitor
Verb.
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no
Declassified in Part - Sanitized Copy Approved for Release 2012/02/08: CIA-RDP78-03424A000800010023-9