EN IEC 63138-2:2021

SLOVENSKI STANDARD
01-april-2021
Večkanalni radiofrekvenčni konektorji - 2. del: Področna specifikacija za okrogle
konektorje skupine MQ4 (IEC 63138-2:2020)
Multi-channel radio-frequency connectors - Part 2: Sectional specification for MQ4 series
circular connectors (IEC 63138-2:2020)
Mehrkanalige Hochfrequenz-Steckverbinder – Teil 2: Rahmenspezifikation für
Rundsteckverbinder der MQ4-Serie (IEC 63138-2:2020)
Connecteurs radiofréquences multicanaux - Partie 2: Spécification intermédiaire pour les
connecteurs circulaires de série MQ4 (IEC 63138-2:2020)
Ta slovenski standard je istoveten z: EN IEC 63138-2:2021
ICS:
33.120.30 Radiofrekvenčni konektorji RF connectors
(RF)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 63138-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2021
ICS 33.120.30
English Version
Multi-channel radio-frequency connectors - Part 2: Sectional
specification for MQ4 series circular connectors
(IEC 63138-2:2020)
Connecteurs radiofréquences multicanaux - Partie 2: Mehrkanalige Hochfrequenz-Steckverbinder - Teil 2:
Spécification intermédiaire pour les connecteurs circulaires Rahmenspezifikation für Rundsteckverbinder der MQ4-
de série MQ4 Serie
(IEC 63138-2:2020) (IEC 63138-2:2020)
This European Standard was approved by CENELEC on 2021-01-20. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63138-2:2021 E

European foreword
The text of document 46F/524/FDIS, future edition 1 of IEC 63138-2, prepared by SC 46F "RF and
microwave passive components" of IEC/TC 46 "Cables, wires, waveguides, RF connectors, RF and
microwave passive components and accessories" was submitted to the IEC-CENELEC parallel vote
and approved by CENELEC as EN IEC 63138-2:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-10-20
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-01-20
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 63138-2:2020 was approved by CENELEC as a European
Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 63138-1 2019 Multi-channel radio frequency connectors - EN IEC 63138-1 2019
Part 1: Generic specification - General
requirements and test methods
IEC 63138-2 ®
Edition 1.0 2020-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Multi-channel radio-frequency connectors –

Part 2: Sectional specification for MQ4 series circular connectors

Connecteurs radiofréquences multicanaux –

Partie 2: Spécification intermédiaire pour les connecteurs circulaires

de série MQ4
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.30 ISBN 978-2-8322-9148-1

– 2 – IEC 63138-2:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Mating face and gauge information . 6
4.1 Mating face dimensions . 6
4.1.1 MQ4 socket connector . 6
4.1.2 MQ4 plug connector . 8
4.1.3 Mating face of RF channel . 11
4.2 Gauges . 12
4.2.1 Gauge for RF channel. 12
4.2.2 Gauge rings for plug outer contact . 13
4.2.3 Gauge for MQ4 socket connector . 14
4.2.4 Gauge for MQ4 plug connector . 15
5 Quality assessment procedure . 16
5.1 General . 16
5.2 Rating and characteristics . 16
5.3 Quality assessment . 18
5.3.1 General . 18
5.3.2 Inspection procedure . 18
5.3.3 Lot-by-lot inspection . 19
5.3.4 Periodic inspections . 20
6 Instructions for preparation of detail specifications . 21
6.1 General . 21
6.2 Identification of the component . 22
6.3 Performance . 22
6.4 Marking, ordering information and related matters . 22
6.5 Selection of tests, test conditions and severities . 22
6.6 Blank detail specification pro forma for MQ4 series circular connectors . 23
7 Marking . 27
7.1 Marking of components . 27
7.2 Marking and contents of package . 27

Figure 1 – MQ4 socket connector . 7
Figure 2 – MQ4 quick-lock plug connector . 9
Figure 3 – MQ4 threaded plug connector . 10
Figure 4 – Mating face of RF channel . 11
Figure 5 – Gauge for socket contact of RF channel . 12
Figure 6 – Gauge for plug outer contact . 13
Figure 7 – Gauge for MQ4 socket connector . 14
Figure 8 – Gauge for MQ4 plug connector . 15

Table 1 – Dimensions of MQ4 socket connector . 8
Table 2 – Dimensions of MQ4 quick-lock plug connector . 9

IEC 63138-2:2020 © IEC 2020 – 3 –
Table 3 – Dimensions of MQ4 threaded plug connector . 10
Table 4 – Dimensions of RF channel . 11
Table 5 – Dimensions of gauge for socket contact . 12
Table 6 – Dimensions of gauge for plug outer contact . 13
Table 7 – Dimensions of gauge for MQ4 socket connector . 14
Table 8 – Dimensions of gauge for MQ4 plug connector . 15
Table 9 – Rating and characteristics . 16
Table 10 – Qualification inspection . 18
Table 11 – Lot-by-lot inspection . 20
Table 12 – Sampling plans for mechanical compatibility and return loss inspection . 20
Table 13 – Periodic inspection . 21

– 4 – IEC 63138-2:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTI-CHANNEL RADIO-FREQUENCY CONNECTORS –

Part 2: Sectional specification for MQ4 series circular connectors

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 63138-2 has been prepared by subcommittee 46F: RF and
microwave passive components, of IEC technical committee 46F: Cables, wires, waveguides,
RF connectors, RF and microwave passive components and accessories.
The text of this International Standard is based on the following documents:
FDIS Report on voting
46F/524/FDIS 46F/533/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

IEC 63138-2:2020 © IEC 2020 – 5 –
A list of all parts in the IEC 63138 series, published under the general title Multi-channel
radio-frequency connectors, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 63138-2:2020 © IEC 2020
MULTI-CHANNEL RADIO-FREQUENCY CONNECTORS –

Part 2: Sectional specification for MQ4 series circular connectors

1 Scope
This part of IEC 63138, which is a sectional specification (SS), provides information and rules
for the preparation of detail specifications (DS) for MQ4 series circular connectors with four
RF channels, as well as a detailed specification of the blank format.
An MQ4 series circular connector with 50 Ω nominal impedance has four RF channels which
can be engaged and disengaged at the same time. There are two versions of plug connectors,
one is a quick-lock version, and the other is a threaded version. The socket connector
provides two coupling mechanisms, a quick-lock and a threaded coupling.
MQ4 series circular connectors can be used in mobile communication systems and in other
communication equipment.
This document also specifies the mating face dimensions and gauging information of MQ4
series circular connectors, and tests selected from IEC 63138-1, applicable to all detail
specifications relating to MQ4 series circular connectors.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 63138-1:2019, Multi-channel radio frequency connectors – Part 1: Generic specification –
General requirements and test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 63138-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Mating face and gauge information
4.1 Mating face dimensions
4.1.1 MQ4 socket connector
The mating face of MQ4 socket connectors is shown in Figure 1 and its dimensions are shown
in Table 1.
IEC 63138-2:2020 © IEC 2020 – 7 –
NOTE Metric dimensions are original dimensions. All undimensioned pictorial configurations are for reference
purpose only.
NOTE 1 Mechanical reference plane.
NOTE 2 Chamfer of the four supplementary grooves is optional.
NOTE 3 Chamfer of the main groove is optional.
NOTE 4 The mating face of the RF channel with pin contact is shown in Figure 4a) and its dimensions are shown
in Table 4.
NOTE 5 The shape of seal ring is optional.
NOTE 6 The initial position number of the RF channel with pin contact and the other positions numbered
clockwise.
Figure 1 – MQ4 socket connector

– 8 – IEC 63138-2:2020 © IEC 2020
Table 1 – Dimensions of MQ4 socket connector
mm
Ref.
Min. Max.
a 31,75 31,80
b 30,35 30,40
c M30 × 1 tolerance 6 g
d 6,80 7,00
e 26,42 26,48
f 6,00 --
g R3,0 nom.
h 7,95 8,05
i 10,95 11,00
j 1,50 1,80
k 19,30 19,45
m 13,90 14,00
p 3,20 3,35
q 1,60 1,75
r 0,50 0,60
t 15,48 15,52
u 10,30 10,90
4.1.2 MQ4 plug connector
4.1.2.1 MQ4 quick-lock plug connector
The mating face of the MQ4 connector with quick-lock type is shown in Figure 2 and its
dimensions are shown in Table 2.

IEC 63138-2:2020 © IEC 2020 – 9 –

NOTE 1 Mechanical reference plane.
NOTE 2 The mating face of the RF channel with socket contact is shown in Figure 4b) and its dimensions are
shown in Table 4.
NOTE 3 The shape of the four supplementary keys is optional.
NOTE 4 The shape of the main key is optional.
NOTE 5 The shape of the spring finger is optional.
NOTE 6 The initial position number of the RF channel with the socket contact and other positions numbered
anticlockwise.
Figure 2 – MQ4 quick-lock plug connector
Table 2 – Dimensions of MQ4 quick-lock plug connector
mm
Ref.
Min. Max.
a -- 42,00
b 31,80 31,90
c 30,05 30,15
d 26,30 26,40
e 8,40 8,60
f 1,20 1,50
g 11,00 11,10
h 6,60 6,80
i 15,48 15,52
j 13,70 13,80
k 7,52 7,58
m 3,00 3,15
n 1,40 1,55
– 10 – IEC 63138-2:2020 © IEC 2020
4.1.2.2 MQ4 threaded plug connector
The mating face of the MQ4 threaded plug connector is shown in Figure 3 and its dimensions
are shown in Table 3.
NOTE 1 Mechanical reference plane.
NOTE 2 The mating face of the RF channel with socket contact is shown in Figure 4b) and its dimensions are
shown in Table 4.
NOTE 3 The shape of the four supplementary keys is optional.
NOTE 4 The shape of the main key is optional.
NOTE 5 The initial position number of the RF channel with socket contact and the other positions numbered anti-
clockwise.
Figure 3 – MQ4 threaded plug connector
Table 3 – Dimensions of MQ4 threaded plug connector
mm
Ref.
Min. Max.
a 7,52 7,58
b 26,35 26,40
c M30 × 1 tolerance 6 H
d 1,20 1,50
e 5,20 5,60
f 11,20 --
i 7,00 --
j 13,70 13,80
k 15,48 15,52
m 3,00 3,15
n 1,40 1,55
p 32,0 nom.
IEC 63138-2:2020 © IEC 2020 – 11 –
4.1.3 Mating face of RF channel
The mating face of the RF channel with pin contact is shown in Figure 4a), the mating face of
the RF channel with socket contact is shown in Figure 4b), and their dimensions are shown in
Table 4.
a) RF channel with pin contact

b) RF channel with socket contact
NOTE Mechanical reference plane.
Figure 4 – Mating face of RF channel
Table 4 – Dimensions of RF channel
mm
Ref.
Min. Max.
a 1,17 1,23
b 5,90 5,93
c 7,25 7,35
d 0,35 0,65
e 2,60 2,90
f 2,90 3,70
g 0,00 0,25
h 0,75 1,00
j 0,00 0,25
k 0,00 0,20
m 3,00 --
a
n -- --
– 12 – IEC 63138-2:2020 © IEC 2020
mm
Ref.
Min. Max.
p 1,8 nom.
b
q -- 6,45
r 3,80 --
u 6,50 6,70
v 1,55 1,65
a
s -- --
a
Slot design is optional when mating with a pin with Ø1,17 mm to Ø1,23 mm. It should meet the requirements
of mechanical and electri
...