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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0000902584-04-000164.txt : 20040921
<SEC-HEADER>0000902584-04-000164.hdr.sgml : 20040921
<ACCEPTANCE-DATETIME>20040921170227
ACCESSION NUMBER:		0000902584-04-000164
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040921
FILED AS OF DATE:		20040921
DATE AS OF CHANGE:		20040921

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TESSCO TECHNOLOGIES INC
		CENTRAL INDEX KEY:			0000927355
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-ELECTRONIC PARTS & EQUIPMENT, NEC [5065]
		IRS NUMBER:				520729657
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0329

	BUSINESS ADDRESS:	
		STREET 1:		11126 MCCORMICK ROAD
		CITY:			HUNT VALLEY
		STATE:			MD
		ZIP:			21031
		BUSINESS PHONE:		4102291000

	MAIL ADDRESS:	
		STREET 1:		11126 MCCORMICK ROAD
		CITY:			HUNT VALLEY
		STATE:			MD
		ZIP:			2121031

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Advisory Research Microcap Value Fund, L.P.
		CENTRAL INDEX KEY:			0001302631
		STATE OF INCORPORATION:			IL
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24746
		FILM NUMBER:		041039745

	BUSINESS ADDRESS:	
		STREET 1:		180 NORTH STETSON AVENUE
		STREET 2:		SUITE 5500
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60601
		BUSINESS PHONE:		312-565-1414

	MAIL ADDRESS:	
		STREET 1:		180 NORTH STETSON AVENUE
		STREET 2:		SUITE 5500
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60601
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-09-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000927355</issuerCik>
        <issuerName>TESSCO TECHNOLOGIES INC</issuerName>
        <issuerTradingSymbol>TESS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001302631</rptOwnerCik>
            <rptOwnerName>Advisory Research Microcap Value Fund, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>180 NORTH STETSON AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 5500</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60601</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Tessco Technologies, Inc.  Common</value>
            </securityTitle>
            <transactionDate>
                <value>2004-09-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4136</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>11.92</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>527058</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ Brien M. O'Brien, Chairman, Advisory Research, Inc.</signatureName>
        <signatureDate>2004-09-21</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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