26.10.  73 Official  Journal  of the European  Communities No C 90/25 
Proposal  for a Council  Directive  concerning  the harmonization  of legislation  in Member 
States  in respect  of radio  interference  caused  by sound  and  vision  TV receivers 
(Submitted  to the Council  by the Commission  on  24 April  1973) 
THE  COUNCIL  OF  THE  EUROPEAN 
COMMUNITIES, 
Having  regard  to  the  Treaty  establishing  the 
European  Economic  Community,  and  in particular 
Article  100  thereof; 
Having  regard  to  the  recommendation  of  the 
Commission; 
Having  regard  to  the  views  of the  European 
Parliament; 
Having  regard  to the  views  of the  Economic  and 
Social  Committee; 
Whereas  in the majority  of Member  States  sound  and 
vision  TV  receivers  are  subject  to strict  provisions 
regarding  the interference  which  they  may  cause,  and 
whereas  such  provisions  differ  from  one  Member 
State  to another;  whereas  the  differences  between 
such  national  provisions  hinder  trade  in receivers 
likely  to cause  radio  interference;  and  whereas  for 
this reason  they  have  a direct  effect  on  the 
establishment  and  functioning  of the  common 
market; 
Whereas  it is consequently  necessary  to lay down,  at 
Community  level,  the regulations  to be observed  in 
regard  to the  permissible  upper  limits  of the  radio 
interference  caused  by the receivers  covered  by this 
Directive,  together  with  the methods  to be used  for 
measuring  such  interference; 
Whereas  for  purposes  of measurement  of  the 
interference  produced  by the  appliances  covered  by 
this Directive  it is necessary  to operate  the appliances 
in specified  conditions  and  to interpret  the  values 
recorded  on the test  set in an identical  manner; 
Whereas  technological  progress  necessitates  frequent 
adaptation  of the technical  requirements  contained  in 
this Directive,  and  whereas  in order  to facilitate 
implementation  of the  measures  necessary  for  this 
purpose  it is appropriate  to adopt  the procedure  for 
close  cooperation  between  Member  States  and  the 
Commission  within  the  committee  responsible  for adaptation  to technical  progress,  set  up  in the 
Directive  relating  to the  harmonization  of  the 
legislative,  statutory  and  administrative  provisions  of 
Member  States  in respect  of radio  interference  caused 
by domestic  electrical  appliances  and  portable  tools 
dated  . . ., 
HAS  ADOPTED  THE  FOLLOWING  DIRECTIVE: 
Article  1 
This  Directive  aims  at harmonizing  the  legislative, 
statutory  and  administrative  provisions  in Member 
States  relating  to radio  interference  caused  by sound 
and vision  television  receivers  by fixing  on the  one 
hand  the permissible  upper  limits  of the interference 
produced  by the  above  receivers  and  on the  other 
hand  the  methods  to be used  for  measuring  such 
interference. 
Article  2 
The equipment  referred  to in Article  1 may  not  be 
placed  on the market  unless  it meets  the requirements 
of the  Directive  in respect  of the  reduction  of 
electrical  interference  which  it is likely  to cause. 
Article  3 
1. The  conformity  of the  sound  and  vision 
television  receivers  with  the requirements  laid  down 
in this  Directive  and  its Annex  shall  be certified  by 
the producer  or importer,  on his own  responsibility, 
in a statement  to be included  in the instructions  for; 
use, the  guarantee  document  or on the  equipment 
itself. 
2. The  use  of marks  or certificates  issued  by 
organizations,  as notified  by each  Member  State  to 
the other  Member  States  and  to the  Commission, 
shall  render  unnecessary  the statement  provided  for 
in the preceding  paragraph. 
Article  4 
Member  States  may  not  invoke  reasons  concerning 
radio  interference  for  prohibiting,  restricting  or 
No C 90/26 Official  Journal  of the European  Communities 26.10.  73 
preventing  the  marketing  or use  of receivers  which 
meet  the  requirements  of this  Directive  and  of its 
Annex. 
Article  5 
Member  States  shall  take  all necessary  steps  to ensure 
that the  test  methods  used  for  official  checks  and 
intended  to verify  compliance  with  the requirements 
for reducing  radio  interference  are in accordance  with 
those  laid  down  in the Annex. 
Article  6 
The requirements  of this  Directive  shall  not  prevent 
the application  in each  Member  State  of the 
provisions  relating  to the protection  of public  utility 
receiving  stations. 
Article  7 
Any amendments  required  in order  to bring  the 
provisions  of the  Annex  to this  Directive  (with  the exception  of Section  1) into  line  with  current 
technical  developments  shall  be agreed  in accordance 
with  the  procedure  in Article  8 of the  Council's 
Directive  of the ... relating  to harmonization-  of the 
legislation  in Member  States  on radio  interference 
caused  by domestic  electrical  appliances,  portable 
tools  and  similar  apparatus. 
Article  8 
1. Member  States  shall  bring  into  force  the 
necessary  provisions  to comply  with  this  Directive 
within  a period  of eighteen  months  from  the date  of 
its issue  and  shall  inform  the  Commission 
immediately  thereof. 
2. Member  States  shall  ensure  that  the text  of the 
provisions  under  national  law  which  they  are 
adopting  in the  field  governed  by this  Directive  is 
forwarded  to the Commission. 
Article  9 
This  Directive  is addressed  to all Member  States. 
26.10.  73 Official  Journal  of the  European  Communities No C 90/27 
ANNEX 
1. SCOPE 
The following  provisions  apply  to sound  and  vision  radio  receivers. 
They  lay down  the maximum  permissible  values  and  also  the test  methods  to be used. 
2. MAXIMUM  PERMISSIBLE  VALUES 
2.0. Introduction 
The maximum  values  quoted  in the following  table  are reference  maximum  values. 
The values  to be taken  into  consideration  for a type  test  for the purpose  of a prior  certificate  shall 
be the reference  values  less  2 dB,  while  the maximum  values  applicable  for a test  on a sample  taken 
for purposes  of checking  shall  be the reference  values  plus  2 dB. 
2.1. Scanning  oscillators:  Maximum  values  of the interference  voltage  as measured  on the supply  network 
The tests  shall  be carried  out in accordance  with  paragraph  3 of these  provisions. 
Voltages 
Frequencies  in kHz Symmetrical Asymmetrical 
ttV dB (nV) nv dB (iiV) 
150 900 59 600 56 
Linear  decrease  in jxV depending  upon 
frequency  up to 500  kHz 
500 200 46 400 52 
500 to 1 605 200 46. 400 52 
2.2. Local  oscillation  of frequency  modulated  radio  receivers  and  television  receivers:  'maximum  radiation 
values' 
The tests  shall  be carried  out  in accordance  with  paragraph  4 of these  provisions. 
Receivers Frequency Max.  values 
Receivers Frequency 
|iV/m dB (|iV/m) 
FM radio  receivers Fundamental  frequency  of local  oscillator 3000  (Notel) 
400 (Note  2) 70 (Note  1) 
52 (Note  2) 
Harmonics  below  300  MHz 400 52 
Harmonics  above  300  MHz  up to 
1 000  MHz 600 56 
TV receivers  functioning  in 
channels  below  300  MHz Fundamental  frequency  of local  oscillator 700 (Note  3) 57 (Note  3) TV receivers  functioning  in 
channels  below  300  MHz 
Harmonics  below  300  MHz 400 52 
Harmonics  above  300  MHz  up to 
1 000  MHz 600 56 
No C 90/28 Official  Journal  of the European  Communities 26.10.  73 
Receivers Frequency Max.  values 
Receivers Frequency 
nV/m dB (nV/m) 
TV receivers  functioning  in 
channels  between  300  and 
1 000 MHz Fundamental  frequency  of local  oscillator 700 (Note  4) 57 (Note  4) TV receivers  functioning  in 
channels  between  300  and 
1 000 MHz Harmonics  below  1 000 MHz 600 56 
Note  1: Limits  applicable  to equipment  for which  the fundamental  frequency  of the local  oscillator 
is higher  than  the receiving  frequency  (supradynes)  and  the intermediate  frequency  of which 
is 10-7  MHz. 
Note  2: Limits  applicable  in all other  cases.  However,  equipment  of a type  other  than  the supradyne 
may be subject  to restrictions  under  national  regulations. 
Note  3: However,  on a national  level  and in the case  of receivers  functioning  on specified  IFs, national 
provisions  may  authorize  the raising  of this limit  up to 2mV/m  (66 dB (£*V/m))  above  200 MHz. 
Note  4: However,  on a national  level  and in the case  of receivers  functioning  on specified  IFs, national 
provisions  may  authorize  the raising  of this  limit  up to 3 mV/m  (70 dB (HV/m)). 
2.3. Radiation  other  than  that  referred  to in paragraph  2.2:  maximum  radiation  values  (eg harmonics 
of the intermediate  frequency) 
The tests  shall  be carried  out in accordance  with  paragraph  5 of these  provisions. 
Max.  values 
Frequency Frequency 
liV/m dB (n V/m) 
30 to 300  MHz 400 52 
300 to 1 000 MHz 600 56 
2.4. Local  oscillators  of FM  radio  receivers  and TV receivers:  Maximum  values  of the interference  voltage 
at the aerial  terminals 
The tests  shall  be carried  out in accordance  with  paragraph  6 of these  provisions;  as a result  of this 
the maximum  values  quoted  correspond  to a nominal  terminal  impedance  of 75 ohms. 
2.4.1.  Receivers  other  than  those  for use in cars 
Receivers Frequency | Max.  values 
Receivers Frequency 
nv dB (tiV/m) 
FM radio  receivers Fundamental  frequency  of local  oscillator 2000  (Note  1) 
315 (Note  2) 66 (Note  1) 
50 (Note  2) 
Harmonics  below  300 MHz 315 50 
• 
Harmonics  above  300 MHz 400 52 
TV receivers  functioning  in 
channels  below  70 MHz Fundamental  frequency  of local  oscillator 560 55 
Harmonics  below  300 MHz 315 50 
Harmonics  above  300 MHz 400 52 
26. 10. 73 Official  Journal  i of the  European  Communities No C 90/29 
Receivers Frequency Max.  values 
Receivers Frequency 
nv dB (jjV/m) 
TV receivers  functioning  in 
channels  between 
70 and 300 MHz Fundamental  frequency  of local  oscillator 1000 60 TV receivers  functioning  in 
channels  between 
70 and 300 MHz 
Harmonics  below  300 MHz 315 50 TV receivers  functioning  in 
channels  between 
70 and 300 MHz 
Harmonics  above  300 MHz 400 52 
TV receivers  functioning  in 
channels  between 
300 and 1 000 MHz Fundamental  frequency  of local  oscillator 2000 66 
Note  1: Limits  applicable  to equipment  for which  the local  oscillator  fundamental  frequency  is higher 
than the receiving  frequency  (supradynes)  and the intermediate  frequency  of which  is 10-7  MHz. 
Note  2: Limits  applicable  in all other  cases.  However,  equipment  of a type  other  than  the supradyne 
may be subject  to restrictions  under  national  regulations. 
2.4.2.  Receivers  for use in cars 
Frequency Max.  values 
Frequency 
nv dB (jiV) 
Fundamental  frequency  of local  oscillator 4 000 72 
Harmonics  below  300 MHz 900 59 
Harmonics  above  300 to 1 000 MHz 400 52 
Interference  other  than  that  referred  to in paragraph  2.4 (eg intermediate  frequency  harmonics) 
The tests  shall  be carried  out in accordance  with  paragraph  6 of these  provisions,  so that  the maxi-
mum  values  quoted  correspond  to a nominal  terminal  impedance  of 75 ohms. 
Frequency Max.  values 
Frequency 
nv dB (nV) 
30 to 300  MHz 
300 to 1 000 MHz 315 
400 50 
52 
3. MEASUREMENTS  OF THE  INTERFERENCE  VOLTAGES  IN THE  RANGE  150  TO 1605  kHz 
PRODUCED  BY TELEVISION  RECEIVERS 
3.1. Introduction 
The voltages  measured  shall  include  those  produced  by time  bases,  semi-conductor  rectifiersfin  the 
network  and  the image  signal. 
3.2. Test  equipment 
The test  receiver  must  meet  the requirements  of publication  1 of the CISPR:  Specification  for the 
CISPR  test equipment  for frequencies  between  0-15  and 30 MHz. 
The recommendations  in regard  to the fictitious  test network  are given  in paragraph  3.4. 
No C 90/30 Official  Journal  of the European  Communities 26.10.  73 
3.3. Tests  — General 
The television  receiver  and  the test network  shall  be set up as shown  in Figs.  1 and 2. 
The supply  lead  must  be so placed  as to follow  the shortest  route  between  the receiver  and  the test 
network  set up on the earth  plate.  Any  excess  length  of the test lead  must  be folded  into  a bundle 
on the network  side. 
If the receiver  has an earth  terminal,  the test should  be carried  out with  and  without  earthing. 
The TV receiver  must  be tuned  and  synchronized  with  a specified  image  signal,  preferably  produced 
locally. 
For this  purpose  a small  external  dipole  aerial  of a maximum  length  of 60 cm should  be used. 
If the receiver  has a built-in  aerial,  the latter  should  be disconnected. 
The image  to be used  shall  be a test  pattern  divided  into  10 horizontal  segments  of equal  size 
graded  from  black  to white.  The  signal  level  shall  be adjusted  so as to make  the noise  from  the 
receiver  visible.  The  frequency  which  gives  the highest  interference  voltage  should  then  be found  and 
the contrast  and  brightness  should  be adjusted  so as to obtain  the maximum  interference  voltage 
while  maintaining  the correct  degrees  of black  and  white.  This  adjustment  shall  be maintained 
during  the tests. 
At all frequencies  in the 150  to 1605  kHz  range  the high  frequency  injected  into  the network  by 
a TV set shall  be measured  on a specified  network  (see  paragraph  3.4). 
3.4. Test  network  (in accordance  with  CISPR  Publication  1) 
A network  is required  which  will  provide  impedances  at a given  high  frequency  between  the supply 
terminals  of the receiver  and  between  each  of these  terminals  and  the earth.  The  network  shall  also 
include  a filter  for protecting  the receiver  against  high  frequency  interference  signals  from  the supply 
network. 
The impedance  at the test  frequency  of this  filter  must  be so high  that  the filter  and  associated 
network,  as shown  in Fig.  3, has a modulus  impedance  of 150  ± 20 ohms  and  an argument  im-
pedance  of not more  than  20° as an absolute  value  between  the terminals  of the receiver  and between 
these  terminals  together  and  the earth. 
The symmetrical  voltage  shall  be measured  between  the terminals  A and  B (Fig.  3), and the asym-
metrical  voltage  between  the terminal  C and the earth. 
These  voltages  are shown  conventionally  by means  of a vector  diagram  as in Fig.  4b. 
Fig. 5 is an example  of a test network  for measuring  the symmetrical  component  (position  1 of the 
switch  S) and the asymmetrical  component  (position  2 of the switch  S), which  can be used  with  a test 
receiver. 
Account  should  be taken  of the attenuation  introduced  by this  network.  The  practical  values  of the 
components  are indicated  in Fig.  5 and in Table  I. 
Fig. 4a is another  example  of a test network  which  does  not require  a matching  transformer.  In such 
Va —J—  Vg case VA,  VB and the mean  of —  are measured  as shown  in Fig.  4b. 
4. RADIATION  MEASUREMENTS  AT  FREQUENCIES  BETWEEN  30 AND  1000  MHz  AT  A 
DISTANCE  OF 3 M 
4.1. Introduction 
The method  described  in paragraph  4.2 can be used  to measure  the radiation,  evaluated  in relation 
to the electric  field,  produced  by frequency  modulation  receiver  and  television  receivers  designed 
• to function  in the 30 to 1 000 MHz  range.  This  test  method  should  be used  in the open  air or in a 
large  building. 
The following  method  is directly  applicable  to radiation  measurements  at frequencies  of the internal 
oscillator  and  its harmonics  in the 30 to 1 000 MHz  range.  By causing  a signal  to act on the receiver 
by means  of any  device  which  does  not affect  the accuracy  of the measurements,  the procedure  indi-
cated  can also  be used  to measure  radiation  at intermediate  frequency  and at its harmonics. 
26.10.73 Official  Journal  of the European  Communities No C 90/31 
4.2. Radiation  measurements 
4.2.1.  Test  location 
The test  area  must  be flat  and  free  of all reflecting  objects.  There  shall  be no foreign  metal  object 
larger  than  5 cm in the vicinity  of the receiver  under  test  or of the field  strength  meter.  The  receiver 
and the field  strength  meter  shall  be located  above  a conducting  earth  composed  of a metal  grid 
measuring  6x9  cm,  as shown  in Fig.  6. 
If this  metal  grid  differs  from  an ideal  conducting  plane,  or if the  test  is carried  out  in a closed 
building,  it must  be ensured  that  this  does  not cause  any  appreciable  interference. 
The horizontal  distance  between  the field  strength  meter  aerial  and  the receiver  aerial,  and  between 
the meter  aerial  and  the receiver  oscillator  must  be 3 m (see  Fig.  7). 
(a) 30 to 300  MHz  frequency  range 
The validity  of the location  and  of the test  equipment  must  be checked  using  the arrangement 
shown  in Fig.  7. The  receiver  is replaced  by a calibrated  signal  generator,  and  a horizontal  dipole 
aerial  1-5 m long  (see  paragraph  4.2.2.1)  is connected  to the generator  output  by a matched  sym-
metrical  line  on the generator  side.  A 300 ohm  line  must  be used.  The  height  of the dipole  from  the 
field  strength  meter  must  be close  to the values  quoted  in Fig.  8. The  exact  value  shall  be deter-
mined  by slightly  varying  the height  either  side  of the theoretical  value  so as to ensure  that  the 
maximum  radiation  is in fact  being  measured. 
The attenuation  produced  by the test location  shall  be evaluated  in relation  to the power  available 
at the 300  ohm  line  (expressed  in dB (10"9W)  to produce  a field  of 100  [xV/m  (see  Fig.  9). 
To ensure  the validity  of the test results,  the field  strength  meter  must  be calibrated  with  the same 
calibrated  signal  generator. 
Care  should  be taken  to ensure  that  the field  strength  meter  is suitable  for the connecting  line. 
In the most  sensitive  positions  of the  meter,  the input  impedance  may  differ  appreciably  from 
the nominal  value;  this  can  be avoided  by carrying  out  the  tests  at a level  high  enough  to 
permit  the use of a fixed  attenuator  in the input  circuit  of the field  strength  meter. 
When  using  a symmetrical/asymmetrical  extended  band  transformer  (see  Fig.  10),  this transformer 
should  be correctly  charged  so as to ensure  satisfactory  functioning  over  the whole  frequency 
range;  this  is achieved  in practice  by inserting  a non-reciprocal  attenuator  giving  an attenuation 
of at least  10 dB between  the symmetrical/asymmetrical  transformer  and  the 300  ohm  line. 
In cases  where  the output  impedance  of the transformer  differs  from  300  ohms,  the attenuator 
can be incorporated  in the matching  circuit. 
When  using  an exactly  tuned  symmetrical/asymmetrical  transformer  (see  Fig.  11) the use  of the 
attenuator  becomes  unnecessary,  but  the  300  ohm  line  must  he correctly  matched  on the  sym-
metrical/asymmetrical  transformer  side. 
It is recommended  to carry  out  a few  tests  in order  to check  the  losses  and  the  impedances 
of the symmetrical/asymmetrical  transformer  and  the losses  in the connecting  lines  (see  Fig.  12). 
It is also  recommended  to check  the  symmetry  of the  symmetrical/asymmetrical  transformer. 
For a satisfactory  test  location  the results  obtained  must  be in good  agreement  with  the curve 
shown  in Fig.  9. 
Note:  The  available  power  is the power  which  would  be provided  by any  generating  system  to a 
£2 suitable  charging  circuit.  It is equal  to 
4R, 
where:  E is the equivalent  open  circuit  voltage  at the terminals  of the system,  the charging  circuit 
of which  has  been  disconnected;  R is the internal  resistance  measured  across  these  terminals. 
(b) Frequency  range  300  to 1 000 MHz 
The validity  of the test  location  and  of the test  equipment  must  be checked  in accordance  with 
the procedure  described  in paragraph  4.2.1,  except  in regard  to the following  points: 
No C 90/32 Official  Journal  of the European  Communities 26.10.  73 
(a) the horizontal  dipole  to be connected  to the signal  generator  must  be 30 cm long; 
(b) The  test  should  be begun  by placing  the dipole  of the field  strength  meter  1 meter  from 
the ground,  after  which  the height  of this  dipole  is varied  within  its scanning  limit  to ensure 
that the maximum  field  is being  measured;  . 
(c) the theoretical  attenuation  curve  for the test location  is shown  in Fig.  14. 
Note:  In cases  where  the attenuation  curve  measured  differs  appreciably  from  that  shown  in Fig. 
14, it is helpful  to measure  the attenuation  of the test location  between  tuned  dipoles.  The  test 
should  be performed  in accordance  with  paragraph  4.2.1  except  in regard  to the length  of the 
dipole  connected  to the signal  generator.  This  dipole  should  be adjusted  to the half  wavelength 
[corresponding  to the test  frequency  and  matched  correctly.  The  power  required  to produce  a 
field  of 100  [xV/m  is very  close  to 1 X 10"9W. 
4.2.2.  Arrangement  of the receiver 
4.2.2.1.  Receiver  aerial 
The aerial  must  be a single  dipole  made  with  a 13 mm  external  diameter  tube.  The  length  of the 
dipole  shall  be 1-5 m in the frequency  range  30 to 300  MHz  and  30 cm in the frequency  range 
300 MHz  to 1 000 MHz.  Other  constructional  details  are given  in Fig.  13. 
The aerial,  fixed  on a non  conducting  mast,  must  be capable  of turning  in the horizontal  plane 
(see 4.2.2.3),  the centre  of the dipole  being  4 m above  the ground  as shown  in Fig.  7. 
4.2.2.2.  Connecting  line 
The connecting  line  from  the aerial  to the receiver,  must  be of the type  and  have  the characteristic 
impedance  for which  the receiver  has been  designed.  If the receiver  has been  designed  to function 
either  with  a coaxial  cable  or with  a symmetrical  line,  the latter  shall  be used.  The  symmetrical 
line must  not  be screened.  The  coaxial  cable,  which  must  not be provided  with  an additional 
screen,  must  be directly  connected  to the  receiver  and  to the  aerial  without  any  intervening 
symmetrical/asymmetrical  transformer  or other  device. 
The type  of connecting  line used  must  be indicated  when  reporting  the results  of the tests. 
In the case  of a symmetrical  line  the flat  side  of the line  must  be fixed  to the mast  by insulators 
which  are sufficiently  close  together  to ensure  good  mechanical  rigidity.  A coaxial  cable  can be fixed 
directly  onto  the mast. 
The arrangement  of the line  is shown  in Fig.  7. 
Normal  sections  of the same  type  of connecting  line,  112  cm,  75 cm,  37-5  and  15 cm respectively 
should  be prepared. 
The length  of the connecting  line  is increased,  when  necessary,  by adding  the 112  cm section  in the 
30 to 80 MHz  frequency  range,  the 75 cm section  in the 80 to 140  MHz  frequency  range  the 
37-5 cm section  in the 140  to 300  MHz  frequency  range  and  the 15 cm section  in the 300  to 1 000 
MHz  frequency  range. 
Additional  sections'should  be arranged  as shown  by the broken  line  in Fig.  7. 
4.2.2.3.  Receiver 
The receiver  must  be so placed  that  the oscillator  is 1 m from  the ground,  as shown  in Fig.  7. 
The support  used  must  be made  of a non-conducting  material. 
The assembly  made  up of the  receiver,  the aerial  and  its supporting  mast  must  be capable  of 
turning  around  a vertical  axis  passing  through  the centre  of the dipole  and the oscillator. 
The oscillator  and  the centre  of the receiver  dipole  must  be located  on the same  vertical  axis,  co-
incident  with  the supporting  mast  of the aerial.  This  assembly  must  be capable  of turning  around  this 
axis,  the plane  of the front  face  of the receiver  remaining  parallel  to its dipole. 
26.10.  73 Official  Journal  of the European  Communities No C 90/33 
The lead  must  be arranged  in the  same  plane,  as shown  in Fig.  7, any  excess  length  of the  lead 
being  gathered  together  at the end  which  is connected  to the power  supply  point. 
An appropriate  system  of filters  must  be included  in the power  supply  circuit  so that  measurement 
accuracy  is not affected. 
4.2.3.  Arrangement  of  the field  strength  meter 
4.2.3.1.  Field  strength  meter  aerial 
This  aerial  must  be a half  wavelength  dipole  which  can  turn  on a vertical  axis  around  a horizontal 
axis which  cuts  the vertical  axis  of the receiver  described  in 4.2.2.3.  The  height  of its centre  must  be 
capable  of continuous  variation  between  1 and  4 m (see  Fig.  7). 
Between  30 and  80 MHz  it must  be designed  with  a dipole  of constant  length  corresponding  to 
half a wavelength  for 80 MHz.  In this  30 to 80 MHz  range,  the field  strength  meter  must  be calibrated 
with  this  fixed  dipole  by means  of a reference  field  at a height  of 4 meters  from  the ground. 
Above  80 MHz,  the  field  should  be measured  using  a half  wavelength  dipole  for  the  measuring 
frequency. 
4.2.3.2.  Connecting  line 
An appropriate  connecting  line  must  be installed  as shown  in Fig.  7, a distance  of more  than  1 m 
being  left  between  the dipole  and  the vertical  section  of the line. 
4.2.3.3.  Field  strength  meter 
An appropriate  field  strength  meter  must  be placed  at a suitable  height.  It may  be supplied  with  power 
from  batteries  or from  the network. 
4.2.4.  Test  method 
4.2.4.1.  Test  with  dipole  connected  to the receiver. 
The radiation  must  be measured  by connecting  the line  from  the dipole  direct  to the aerial  terminals 
of the receiver. 
The field  strength  meter  aerial  must  be turned  for  the  horizontal  polarization  measurement  and 
placed  at a height  above  the ground  as shown  in Fig.  8. The  assembly  made  up of the receiver  and 
its aerial  is then  turned  so as to obtain  the full  scale  deflection  of the meter,  after  which  the height 
of the  meter  aerial  is varied  between  1 and  4 m until  full  scale  deflection  of the  meter  is obtained. 
In the  case  of a receiver  with  a symmetrical  line,  the  tests  are  repeated  by reversing  the  line 
connections.  For  a receiver  with  a coaxial  cable,  the relative  position  of the  chassis  with  reference 
to the  dipole  must  be reversed  by 180  °. When  the  radiation  at a single  given  frequency  has  to be 
determined,  the length  of the connecting  line  must  be increased  by the addition  of sections,  as speci-
dified  in paragraph  4.2.2.2,  and  the tests  must  be repeated. 
If the tests  are made  in an extended  frequency  range,  it is unnecessary  to repeat  the test  after  ad-
ditional  sections  have  been  added  to the connecting  line. 
The highest  field  value  found  during  the above  operations  shall  be taken  for measurement  of hori-
zontal  polarization  radiation,  for this  type  of test.  The  same  test  procedure  is repeated,  by placing 
the dipole  of the field  strength  meter  in the vertical  position  and  varying  its height  from  2 to 4 m for 
the 30 to 300  MHz  frequency  range  and  from  1 to 4 m for the 300  to 1 000 MHz. 
It is not considered  necessary  to repeat  the test  by turning  the receiver  dipole  vertically. 
4.2.4.2.  Test  with  built-in  aerial 
Disconnect  the connecting  line  from  the receiver,  keep  it at a distance  of at least  20 cm from  the 
receiver  so as to avoid  any  coupling,  and  connect  the  built-in  aerial.  The  experimental  procedure 
No C 90/34 Official  Journal  of the European  Communities 26.10.  73 
indicated  in paragraph  4.2.4.1  should  then  be followed  in order  to determine  the maximum  values 
of the horizontal  and  vertical  components  of the radiated  field. 
When  it is possible  for the  user  to reverse  the connections  of the  built-in  aerial,  a test  should  be 
performed  to determine  the position  producing  the maximum  radiation. 
4.2.4.3.  Test  without  aerial 
The receiver  aerial  terminals  should  be closed  on a non-inductive  resistance  of 300  ohms  if the receiver 
input  is designed  for a symmetrical  line,  and  75 ohms  if the  input  is designed  for a coaxial  cable. 
The test  is similar  to that  described  in paragraph  4.2.4.2. 
4.2.4.4.  Evaluation  of the radiation  produced 
The highest  value  found  during  the tests  described  in paragraph  4.2 shall  be taken  as the characteristic 
value  for the radiation  from  the receiver. 
5. MEASUREMENT  OF  INTERMEDIATE  FREQUENCY  RADIATION  AND  OTHER  TYPES  OF 
RADIATION 
5.1. Test  location 
The test  location  must  be in accordance  with  paragraph  4.2.1  and  Figures  6 and  7. Fig.  15 shows 
a plan  view  of the  earthed  ground,  the  lay-out  of the  test  aerial  and  the  receiver  under  test.  The 
additional  equipment  required  for measuring  intermediate  frequency  radiation  includes  two  aerials 
Ai and  Ag to which  signals  are fed from  a single  generator  by means  of cables.  Attenuator  circuits, 
or transformers,  supply  the  two  aerials  with  equal  power  and  effect  the correct  matching  of the 
cables  and  the generator.  The  aerials  Ai and  Aa may  be half-wavelength  dipoles  tuned  to the working 
frequency  of the receiver  under  test. 
The two  aerials,  placed  4 m from  the ground,  are arranged  horizontally  at right  angles  to each  other, 
as shown  in Fig.  15.  Their  purpose  is to create  a field  the action  of which  on the  aerial  of the 
receiver  under  test  is independent  of the orientation  of the aerial.  To achieve  this  result  the two  aerials 
can be fed in quadrature,  by adjusting  the relative  length  of the cables  supplying  each  aerial.  A phase 
shift  network  can  also  be incorporated  in one  of the  cables.  The  uniformity  of the  field  must  be 
ensured  by connecting  a field  strength  meter  to the aerial  normally  associated  with  the receiver  under 
test and  by turning  this  aerial  through  360  The  equipment  is considered  to be satisfactory  if the 
signal  received  varies  less  than  ± 1 dB. 
During  this  test  operation  it is possible  to establish  the relationship  between  the reading  given  by the 
generator  and  the  field  produced  at the point  where  the aerial  of the  receiver  under  test  is located. 
5.2. Arrangement  of the receiver 
As specified  in paragraph  4.2.2. 
5.3. Arrangement  of the field  strength  meter 
As specified  in paragraph  4.2.3. 
5.4. Test  method 
5.4.1.  Measurement  with  dipole  connected  in the receiver 
The radiation  must  be measured  by connecting  the  line  from  the  dipole  A3  direct  to the  aerial 
terminals  of the  receiver.  The  generator  output  signal  must  be adjusted  so as to produce  a voltage 
of 10 mV  at the receiver  aerial  terminals,  for an input  impedance  of 75 ohms.  The  aerial  of the field 
strength  meter  is turned  for the horizontal  polarization  measurement  and  placed  at a height  above 
the ground  corresponding  to the  frequency  at which  the test  is to be made,  as indicated  in Fig.  8. 
26.10.  73 Official  Journal  of the  European  Communities No C 90/35 
The assembly  consisting  of the  receiver  and  its aerial  is then  turned  until  full  scale  deflection  of 
the field  strength  meter  is obtained,  after  which  the  height  of the  meter  aerial  is varied  between 
1 and  4 m until  the meter  again  shows  full  scale  deflection. 
When  the  maximum  field  position  has  been  determined,  the output  signal  of the generator  is reduced 
from  its initial  value  in order  to obtain  the  input  signal  producing  maximum  radiation  at inter-
mediate  frequency. 
Finally,  the  point  at which  full  scale  deflection  occurs  is again  found  by orientating  the  assembly 
consisting  of the receiver  and  its aerial  and  by adjusting  the height  of the field  strength  meter.  The 
field  value  found  during  this  final  operation  is taken  as the measurement  value  of the  radiation  at 
the frequency  concerned. 
The same  test  procedure  is repeated  by placing  the dipole  of the field  strength  meter  in the vertical 
position  and  varying  its height  from  2 to 4 m. 
5.4.2.  Test  with  built-in  aerial 
As the intermediate  frequency  and  its harmonics  are not  normally  radiated  by the aerial,  the tests  as 
specified  in this  paragraph  are required  only  in exceptional  cases. 
The connecting  line  is disconnected  from  the receiver,  leaving  a distance  of at least  20 cm between 
its extremity  and  the aerial  terminals,  so as to prevent  any coupling.  The  built-in  aerial  is then  connected. 
The radiation  is measured  in exactly  the same  way  as in paragraph  5.4.1;  it may  however  be necessary 
to use  a generator  output  signal  of a higher  level  to compensate  for  the reduced  efficiency  of the 
receiving  aerial. 
6. MEASUREMENT  OF  THE  RESIDUAL  VOLTAGE  OF  THE  LOCAL  OSCILLATOR  AT  THE 
AERIAL  TERMINALS  OF THE  RECEIVER,  BETWEEN  30 MHz  AND  1 000 MHz 
6.1. Introduction 
It may  be desirable  to measure  the  local  oscillator  voltage  remaining  at the  aerial  terminals  of a 
receiver,  for example: 
(a) when  several  receivers  are  connected  to a common  aerial  system,  the  power  remaining  at the 
terminals  of one  of the  receivers  may  produce  interference  in the other  receivers  via the supply 
cables  and  the common  amplifier; 
(b) when  individual  aerials  are installed  fairly  close  to one  another,  coupling  between  the  receiving 
stations  is caused  mainly  by the aerials  in such  case. 
6.2. Test  on receivers  with  aerial  input  by coaxial  cable 
The aerial  terminals  of the receiver  are connected  to the test  equipment  by a 75 ohm  coaxial  cable 
and,  if necessary  via an impedance  matching  network  (see  Fig.  16). 
The impedance,  at the  receiver,  must  be 75 ohms;  if the  input  impedance  of the  test  equipment  is 
not equal  to 75 ohms,  a fixed  matching  attenuator  must  be inserted  between  the  test  equipment 
and the  receiver.  The  impedance  of this  attenuator,  as seen  from  the  receiver,  must  be equal  to 
75 ohms.  Unless  the input  impedance  of the test  equipment  is known  precisely,  an attenuator  giving 
an'attenuation  of at least  10 dB must  be inserted  between  the connecting  cable  and  the test  equipment 
to reduce  any  effects  which  the lack  of precision  might  have  on the impedance  value. 
The test  set is tuned  to the  relative  frequency  radiated  and  is adjusted  so as to give  as an output 
a suitable  reference  reading.  Then  a normal  signal  generator,  with  an output  impedance  of 75 ohms, 
is connected  (via  any  attenuator  and  matching  device  normally  used  for  the  test)  instead  of the 
receiver.  Its output  level  is adjusted  so as to give,  on the  test  set,  the  same  reference  reading. 
Care  should  be taken  that  the  RF currents  flowing  between  the  receiver  chassis  and  the  external 
surface  of the screen  of the coaxial  cable  do not  penetrate  inside  this  cable  and  thus  cause  measure-
ment  errors.  This  can  be avoided,  for example,  by using  ferrite  tubes. 
No C 90/36 Official  Journal  of the European  Communities 26.10.  73 
6.3. Test  on receivers  with  symmetrical  aerial  input 
The test  method  is similar  to that  described  in paragraph  6.2.  The  test  equipment  is shown  in Fig.  17. 
A system  of resistances  is inserted  between  the test  equipment  at a distance  of 0-5 m from  the receiver 
and is connected  to the receiver  by means  of an unscreened  symmetrical  cable.  This  system  should 
provide  correct  matching  between  the  receiver  and  the  symmetrical/asymmetrical  transformer  and 
should  attenuate  the asymmetrical  currents.  If the asymmetrical  currents  cause  interference  — this 
can generally  be checked  by changing  over  the conductors  of the symmetrical  cable  at the receiver 
input  — they  must  be suppressed  by means  of suitable  devices  such  as ferrite  tubes  or filters. 
Note:  The  matching  system  and  the symmetrical/asymmetrical  transformer  are not described  in detail, 
since  it is possible  to use  various  methods  for this,  eg a 'Guanella'  transformer  (radio  transmission 
line wound  on a magnetic  core)  or ferrite  stop  rings. 
6.4. Presentation  of results 
The results  are expressed  by the various  values  of the dB level  (t*V)  of the substitution  signal  supplied 
by the generator  at 75 or 300  ohms,  as appropriate. 
26.10.73 Official  Journal  of the European  Communities No C 90/37 
radiating 
television 
receiver 
> 80 cm 
40 cm 
measuring 
apparatus 
coaxia  cable 
mains 
artificial 
non-metallic network support screened 
' room 
Figure  1 (Clause  3.3) 
40 cm 
Figure  2 (Clause  3.3) 
Example  of measurement  of the  radio-frequency  signal  into  the  mains  in a shield  screen  room 
No C 90/38 Official  Journal  of the European  Communities 26.10.73 
Figure  2 (Clause  3.3) 
Picture  corresponding  to CCIR  test signal  No 1 
01 jiF 
•O A 
> 100  o 300 n 
radio-frequency 
isolating 
filter mains -O C 
100 o 300 O. 
01 iiF 
Figure  3 (Clause  3.4) 
Basic  circuit  of artificial  mains  network 
I I 
01 uF 375  O 75 O 
90 Ci 
330 O 
selective 
voltmeter 
75 O additional 
filter sections 
if required 90 O 
375 O 75 O 
coaxial 
cable  75 O 01 uF 
P = connections  for receiver 
Figure  4a (Clause  3.4) 
Example  of an artificial  mains  network  for use with  a selective  voltmeter  impedance  of 75 ohms 
Figure  4b (Clause  3.4) 
Vector  diagram  of interference  voltages 
26.10.73 Official  Journal  of the  European  Communities No C 90/39 
Additional 
filter  sections, 
if required P = connections  for receivers 
1 = symmetrical  component 
2 = asymmetrical  components 
Figure  5 (Clause  3.4) 
Example  of an artificial  mains  network  for use with  a CISPR  measuring  apparatus CISPR 
measuring 
apparatus 
TABLE  I (Clause  3.4) 
Values  of the components  of the mains  shown  in Figure  5, attentuations  and 
input  impedances  of the artificial  mains  network 
z 50 ft 60 n 75 ft II 152-9  (150)  ft 169-7  (160)  O 187-5  (180)  ft 
Rg R4 118-7(120)  ft 112-2  (110)  a 107-1  (110)  ft 
R5 390-7  (390)  ft 483-9  (470)  Q 621-4  (620)  ft 
Re =  R7 275-7  (270)  ft 230-3  (220)  a 187-5  (180)  ft 
R8 =  R. 22-8 (22)  Q 27-6 (27)  O 34-5 (36)  ft & 
II 107-8  (110)  a 129-1  (130)  ft 161-3  (150)  ft 
RIS 50 ft 60 ft 75 ft 3 
II 
2 2-5 : 1 2-5 : 1 2-5 : 1 
Asym 20 (20)  dB 20 (19-7)  dB 20 (19-8)  dB 
Aasym 20 (19-9)  dB 20 (19-8)  dB 20 (20)  dB 
Zsym 150 (150)  a 150 (145-7)  ft 150 (151-2)  ft 
Zasym 150 (148)  Q 150 (143-4)  ft 150 (145-2)  ft 
Note:  For  resistances,  standardized  values  are given  between  brackets  (tolerance  5 %). 
For attenuations  and  input  impedances  of the artifical  mains  network,  calculated  values  are given  between 
brackets. 
No C 90/40 Official  Journal  of the European  Communities 26.10.  73 
3-0 m 
Figure  6 (Article  4.2.1) 
Measuring  site 
dipoie 
dipoie feeder 
length 
3-9 m 
3-0 m 
> 15 cm 
r— 
V 
oscillator 
valve additional 
section 
filter mains filter receiver field-
strength 
meter 
Figure  7 (Article  4.2.1) 
Open-field  measurement  at 3 m distance 
26.10.  73 Official  Journal  of the European  Communities No C 90/41 
h (m)  height 
14 
12 
10 
8 
6 
4 
2 
0 
30 100 150 200 250 300 MHz 
frequency 
Figure  8 (Article  4.2.1) 
Field-strength  meter  aerial  height 
dB (10-9W)  available  input  power 
28 
26 
24 
22 
150 200 250 300 MHz 30 50 100 
frequency 
Figure  9 (Article  4.2.1) 
Site attenuation  curve 
No C 90/42 Official  Journal  of the European  Communities 26.10.  73 
130 n 
rOATV 
i 87-6  Q 25 O 
•njvif 50 O 
75:75  fJ 300 Q 
130 O 
11-4 dB 
75:300  O 300 Q 578 O 578 n 
10 dB 
signal  generator broad-band  balun feeder dipole attenuator 
Figure  10 (Article  4.2.1) 
Examples  of circuit  arrangements  for measurement  of the site attenuation  curve  with  a broad-band  balun 
precision  tuned  balun signal  generator 50:200  O 300 O 
feeder dipole 
Figure  11 (Article  4.2.1) 
Example  of circuit  arrangement  for measurement  of the site  attenuation  curve  with  a precision  tuned  balun 
26.10.  73 Official  Journal  of the  European  Communities No C 90/43 
50:200  O 
50 Q 
•nnru 
tuned  balun 
fVUV 
75:300  Q 
broad-band  ba!ur> signal 
generator I 
| 50  a 
• ~ —I—r\ru\^-
300 Q I 1 50  n 
— — I -nAIT/' 200:50  O 
tuned  balun 
300 Q . 
50 O 
| • HJUlr 
I 
feeder tuned  balun 200:50  a 
Figure  12 (Article  4.2.1) 
Examples  ofjcircuit'arrangements  for control  measurements  on;balun 
\ 
assembly,  partly 
exploded 
176 
threaded^  — 
hole  \r 737 
IE3& 
*l J/  hole 
v -&--S U ^  J E53B-
13 0 dipole  element  (duraluminium) 
dipole  support  (methyl  methacrylate, 
6 mm  thick)  all dimensions  in mm 
Figure  2 3^(Article  4.2.2) 
Receiver  dipole  construction 
No C 90/44 Official  Journal  of the European  Communities 26.10.  73 
P dB (10-9  W) Available  imput  power 
80 
75 
70. 
65 
60 
55 
50 
45 
40 
35 
30 
25 
20 
15 
10 
05 
0 
300 350  400  450  500  ' 550  600  650  700  750  800  850  900  950  1000 
MHz 
frequency ^4 
k59 
40 
L38 36 
32 
27 
20 21 
14 
08 
^07 04 
01 01 
theoretical  site  attenuation  P  = P0  — G + a 
power  into  a tuned  half-wave  dipole  to give  a field  strength  of 100  (i V/m,  when 
d, = path  length  of the direct  wave,  and  P0  = 10+20  log 1  ' dB  (10-9  W) 
d2 = path  length  of the reflected  wave  '  "2) 
I l\  + JL\  2 + (JL\  2 G = gain  in decibels  of the standard  dipole  with  reference  to a half dipole  |  I  300/  V300/ 
j a  = 10 log 5  dB 
a = mismatch  loss  in decibels  between  a 300  Q generator  and  the standard  dipole  4  . R 
with  an impedance  Z = R + jX )  300 
Figure  14 (Paragraph  4.21) 
Theoretical  site  attenuation  curve  for the range  300 MHz  to 1000  MHz 
26.10.73 Official  Journal  of the European  Communities No C 90/45 
A 2 
aerials  fed in quadrature 90' 
A 3 
coaxial  feeders receiver 
matching  sections 
A 4 
signal 
generator 
3 m 
6 m 
A, and  A2  4 m above  ground 
A3 aerial  connected  to receiver  under  test 
A4 aerial  connected  to field-strength  meter 
Figure  15 (Clause  5.1) 
Measurement  of receiver  radiation  at the intermediate  frequency 
No C 90/46 Official  Journal  of the European  Communities 26.10.  73 
matching  mains 
— -Q-matching  mains  and/or  attenuation 
apparatus 
measuring 
apparatus 
Figure  16 (Clause  6.2) 
Disposition  of components  to perform  measurements  on a receiver  designed  to operate  with  a coaxial  feeder 
connected  to the receiver  and to the aerial 
balanced 
unscreened 
feeder 
0-5 m i 
I matching  symmetrical/ 
I mains  /  ffihi™Cal 
I y  BALUN  / switchin9 matching  mains 
and/or  attenuation 
apparatus 
=©=/  L measuring 
apparatus 
Figure  17 (Clause  6.3) 
Disposition  of components  for measurements  on a receiver  with  symmetrical  aerial  input 
Note:  The  symmetrical/asymmetrical  switching  unit  could  include  a component  for suppression  of asymmetrical 
currents.