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I TSDtN FORM NO. 72 I APR.'47

INTELLIGENCE T-2 SPECIAL ORDER SHEET

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BIO. IP REFERENCE NUMBER

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TD.U.

TITLE Test specification for AN/AFC-1 earrct sweeper

AUTHOR(3)_ Monroe, R. B.; Rhlrer, R. R. ORIO. AGENCY Hnrvnrrl Univ.

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•ARCH LABORATORY

HARVARD UNIVERSITY

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SECRET i ;

NOo 7 August 24, 1943

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TEST SPECIFICATION

FOR

AN/APQ-1 CARPET SWEEPER

SECRET «We: this drxument contains information i«ectiRt Ihe national defense of the United State« within the meaning of th« Espionage Act (U.'s.C. 50:31, 32). the transmission of this document or th* re»eleticn of its contents m any manner to any unauthorized «•—1 is prohibited by law

SECRET Copy Hoc

•

RADIO RESEARCH LABORATORY Harvard Unlvarsity

Written by: R0 Bo Monroe Rs Ro Rhiger

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SECRET -1°

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RRL TEST SPECIFICATION N0o 7

AN/APQ-1 "CARPET SWEEPER"

I Introduction

This test specification outlines the required performance character- istics of the AN/APQ-1 "Carpet Sweeper" and gives a description of the. methods of measuring the performance of this equipment used at this laboratory«

The AN/APQ-1 "Carpet Sweeper" is a combination transmitter and receiver, which automatically 3cans a predetermined frequency spectrum until a signal emanating from a radar station is received, It then locks itself on that frequency end for a predetermined time interval transmits a noise modulated jamming signal intended to render illegible the information presented to the radar station. Upon complet- ing the period of transmission the "Carpet Sweeper", depending upon the setting of a switch, either;

(a) determines whether the radar station i3 still transmitting, and if so, repeats its cycle of listening and jamming until the radar signal is no longer detected, or «•*>

(b) sweeps off the first signal frequency and pro~ ceed8 until another signal is received and thereupon Jams that signal far the selected time interval, after which it continues sweeping and Jams each signal successively in the frequency range to which the equip- ment is adjustedc

The switch for selecting the (a) or (b) type of operation is located on the chassis inside the dust cover0

The "Garpet Sweeper" utilizes the same tubes and circuits when opera- ting either as a transmitter or a receiver and therefore is, in effect, a "transceiver"o The block diagram, shown in Figc 1 illustrates how this is accomplished!,

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II Performance Characteristics

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SECRET •

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SECRET

AN/APg-1 "CARPET 3W3KPER", cont'd,

-2-

III Tuba Complement

Quantity

1 1 1 1

2

2

1

Typo

931 6AC7 6AG7 6SH73T 807 2050 WE 358A3. (or 703A) 5R4CT (or 5Ü4G) 2X2

Function

Hoise Generator Video AmpHfiep Video Amplifier Amplifier and Detractor Modulator Control Tube

Oscillators

Rectifiers Rectifier

O

All of these tubes, with the exception of the 931 noise generator and the BE 35R*S (or HS 703A), are listed on the Army-Navy preferred tuba list0

IV Precautions During Service Acceptance Tests

The AH/APQ-1 "Carpet Sweeper" equipment is very similar to the RC-156/CyCD "Carpet Transmitter" which has already passed the Army servr* ice acceptance tests*

(a) It is believed, however, that some trouble may be encountered under the most severe conditions of acceleration during the vibration test because of the relays used in the timing mechanism of this equipmente These relays and the mechanical timing equipment should be carefully watched dur- ing this testa

(b) A type "IN" antenna connector is used on the ÄN/APQ.-1 equipment,, The insulation in this connector at the present time is polystyrene, the softening point of whieh is 83 to 84° Co It is therefore retiommenflfid thnt a temperature of 80° C be used in the special, temperature only, non-operating teBt outlined in ARL Bulletin 102Ao

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