To: rsgb_lf_group@blacksheep.org, rsgb_lf_group@yahoogroups.co.uk
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From: Markus Vester <markusvester@aol.com>
Message-Id: <8D2A262E5AABBD8-1F8C-27C7C0@webmail-vm073.sysops.aol.com>
Date: Tue, 11 Aug 2015 11:38:25 -0400
Subject: LF: Inductive short range devices - the end of LF radio?
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=20A=20few=20weeks=20ago,=20the=20IARU=20EMC=20coordinator,=20Thilo=20Kootz,=20m=
ade=20me=20aware=20of=20an=20European=20directive=20"Decision=202006/771/EC=20on=
=20harmonisation=20of=20the=20radio=20spectrum=20for=20use=20by=20short-range=20=
devices...",=20see?http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=3Duriserv:=
OJ.L_.2013.334.01.0017.01.ENG=20=0D=0A?=0D=0AThis=20rule=20prescribes=20magnetic=
=20fieldstrength=20limits=20for=20short=20range=20devices,=20including=20inducti=
ve=20chargers=20in=20the=209=20to=20150=20kHz=20frequency=20range=20(e.g.=20the=20=
"Ikea=20chargers"=20mentioned=20in=20https://uk.groups.yahoo.com/neo/groups/rsgb=
_lf_group/conversations/messages/4650=20).=20Thilo=20asked=20me=20about=20potent=
ial?interference?to=20LF=20amateurs=20and=20other=20services,=20and=20after=20so=
me=20near-field=20calculations=20I=20came=20up=20with=20a=20paper:=0D=0A=0D=0Aht=
tp://df6nm.bplaced.net/LF/srd/LF_interference_from_inductive_SRDs.pdf=0D=0A?=0D=0A=
The=20conclusions=20seem=20to=20be=20rather=20alarming:=20For=20an=20LF=20amateu=
r=20in=20a=20typical=20suburban=20environment,=20the=20noise=20may=20go=20up=20b=
y=20as=20much=20as=2070=20dB=20(!)=20if=20only=20one=20of=20the=20neighbours=20h=
appens=20to=20operate=20a=20compliant=20inductive=20device=20on=20136=20kHz!=20A=
s=20these=20devices=20will=20probably=20be=20deployed=20in=20large=20numbers,=20=
this=20may=20well=20be=20the=20end=20of=20receive=20possibilities=20for=20many=20=
of=20us.=20=0D=0A?=0D=0AI=20am=20hoping=20for=20increased=20awareness=20regardin=
g=20this=20issue,=20amongst=20amateurs=20as=20well=20as=20other=20affected=20par=
ties.=20Let=20us=20raise=20our=20voices,=20and=20try=20to=20use=20our=20affiliat=
ions=20to=20obtain=20some=20influence=20on=20political=20decisions,=20which=20ha=
ve=20so=20far=20apparently=20been=20guided=20by=20economical=20interest=20alone.=
=20=0D=0A?=0D=0AAll=20the=20best,=0D=0AMarkus=20(DF6NM)=20=0A=0A
----------MB_8D2A262E5AD1D3C_1F8C_4A6E71_webmail-vm073.sysops.aol.com
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=0D=0A<div=20style=3D"color:=20black;=20font-family:=20arial;=20font-size:=2010p=
t;"><font=20color=3D"black"=20face=3D"arial"></font><span=20style=3D"display:=20=
inline-block;"=20contenteditable=3D"false"></span></div>=0D=0A=0D=0A<div>=20A=20=
few=20weeks=20ago,=20the=20IARU=20EMC=20coordinator,=20Thilo=20Kootz,=20made=20m=
e=20aware=20of=20an=20European=20directive=20"Decision=202006/771/EC=20on=20harm=
onisation=20of=20the=20radio=20spectrum=20for=20use=20by=20short-range=20devices=
...",=20see&nbsp;<a=20href=3D"http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=
=3Duriserv:OJ.L_.2013.334.01.0017.01.ENG">http://eur-lex.europa.eu/legal-content=
/EN/TXT/?uri=3Duriserv:OJ.L_.2013.334.01.0017.01.ENG</a>=20</div>=0D=0A=0D=0A<di=
v>&nbsp;</div>=0D=0A=0D=0A<div>This=20rule=20prescribes=20magnetic=20fieldstreng=
th=20limits=20for=20short=20range=20devices,=20including=20inductive=20chargers=20=
in=20the=209=20to=20150=20kHz=20frequency=20range=20(e.g.=20the=20"Ikea=20charge=
rs"=20mentioned=20in=20<a=20href=3D"https://uk.groups.yahoo.com/neo/groups/rsgb_=
lf_group/conversations/messages/4650">https://uk.groups.yahoo.com/neo/groups/rsg=
b_lf_group/conversations/messages/4650</a>=20).=20Thilo=20asked=20me=20about=20p=
otential&nbsp;interference&nbsp;to=20LF=20amateurs=20and=20other=20services,=20a=
nd=20after=20some=20near-field=20calculations=20I=20came=20up=20with=20a=20paper=
:<br>=0D=0A</div>=0D=0A=0D=0A<div><a=20href=3D"http://df6nm.bplaced.net/LF/srd/L=
F_interference_from_inductive_SRDs.pdf">http://df6nm.bplaced.net/LF/srd/LF_inter=
ference_from_inductive_SRDs.pdf</a></div>=0D=0A=0D=0A<div>&nbsp;</div>=0D=0A=0D=0A=
<div>The=20conclusions=20seem=20to=20be=20rather=20alarming:=20For=20an=20LF=20a=
mateur=20in=20a=20typical=20suburban=20environment,=20the=20noise=20may=20go=20u=
p=20by=20as=20much=20as=2070=20dB=20(!)=20if=20only=20one=20of=20the=20neighbour=
s=20happens=20to=20operate=20a=20compliant=20inductive=20device=20on=20136=20kHz=
!=20As=20these=20devices=20will=20probably=20be=20deployed=20in=20large=20number=
s,=20this=20may=20well=20be=20the=20end=20of=20receive=20possibilities=20for=20m=
any=20of=20us.=20</div>=0D=0A=0D=0A<div>&nbsp;</div>=0D=0A=0D=0A<div>I=20am=20ho=
ping=20for=20increased=20awareness=20regarding=20this=20issue,=20amongst=20amate=
urs=20as=20well=20as=20other=20affected=20parties.=20Let=20us=20raise=20our=20vo=
ices,=20and=20try=20to=20use=20our=20affiliations=20to=20obtain=20some=20influen=
ce=20on=20political=20decisions,=20which=20have=20so=20far=20apparently=20been=20=
guided=20by=20economical=20interest=20alone.=20</div>=0D=0A=0D=0A<div>&nbsp;</di=
v>=0D=0A=0D=0A<div>All=20the=20best,<br>=0D=0AMarkus=20(DF6NM)=20<br>=0D=0A<br>=0D=
=0A</div>=0D=0A
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