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Documenting Interference


When documenting interference, information listed at the end of this 
message (adapted from Appendix S10 to the Radio Regulations) is considered 
most useful.  Document the information you can provide reliably.  Leave out 
the rest.

Remember, interference impedes reception of another station.  So, while 
hearing an intruder is valuable to document, documenting interference with 
communication from another station is more important.

The process is intended [1] to identify, as clearly as possible, the source 
of the problem and [2] to help those responsible correct the problem 
quickly and effectively.

Experience shows best results come at the very lowest level with friendly 
communication assuming good will on all sides.  Involving governments 
should be the very last resort.

Suggest using established protocols through IARU member societies.  They 
are in the best position to evaluate many reports and to guide the process 
the right way.

Hope this helps.

73, art.....
W4ART, Fairfax, VA

Report of harmful interference

Particulars concerning the station causing the interference:

a Name, call sign or other means of identification
b Frequency measured
         Time (UTC)
c Class of emission 1
d Bandwidth (indicate whether measured or estimated)
e Measured field strength or power flux-density 2
         Time (UTC)
f Observed polarization
g Class of station and nature of service
h Location/position/area/bearing (QTE) (including orbital data, if applicable)
i Location of the facility which made the above measurements

Particulars concerning the transmitting station interfered with (i.e. the 
station you are trying to receive):

j Name, call sign or other means of identification
k Frequency assigned
l Frequency measured
         Time (UTC)
m Class of emission 1
n Bandwidth (indicate whether measured or estimated)
o Location/position/area (including terrestrial station and/or satellite 
name and orbital data, if applicable)
p Location of the facility which made the above measurements

Particulars furnished by the receiving station experiencing the 
interference (i.e. your station):

q Name of station
r Location/position/area
s Dates and times (UTC) of occurrence of harmful interference
t Bearings (QTE) or other particulars (which may include satellite timing, 
doppler shift, and other relevant information)
u Nature of interference
v Field strength or power flux-density of the wanted emission
at the receiving station experiencing the interference 2
         Time (UTC)
w Polarization of the receiving antenna or observed polarization
1 The class of emission shall contain the basic characteristics listed in 
Appendix S1. If any characteristic cannot be
determined, indicate the unknown symbol with a dash. However, if a station 
is not able to identify unambiguously
whether the modulation is frequency or phase modulation, indicate frequency 
modulation (F).
2 When measurements are not available, signal strengths according to the 
QSA scale should be provided.

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