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From: MarkusVester@aol.com
Message-ID: <483.4f33bd5.31e025f2@aol.com>
Date: Fri, 7 Jul 2006 17:02:42 EDT
To: rsgb_lf_group@blacksheep.org
MIME-Version: 1.0
Subject: Re: LF: QRM in Eastern Europe
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Dear Dave and LF,

the prospect of 100 kW on 135.6 sure sounds like bad news! Even with a fairl=
y=20
"clean" carrier, I'd expect a few problems:

- at 600 km, it would be a signal of ~62 dB=B5V/m daytime, about 6 dB more a=
t=20
night. As this would be in the passband of my receiver, I'll have to do a=20
redesign with 30 dB less gain :-(=20

- with 340 Hz upward shift, the FSK bursts will splatter the into the amateu=
r=20
band, at least once every 10 seconds.

- at night, DCF 39 is contaminated by strong Luxembourg effect from various=20
BC stations, with a modulation depth up to a few percent and sidebands reach=
ing=20
well into the band. Due to the inertia involved in the ionospheric heating=20
process, they tend to be much more intense close to the carrier - 1 kHz can=20=
make=20
a big difference.

- SXV are currently operating around 135.76 kHz FSK. They might feel incline=
d=20
to evade QRM and move further up in frequency.

73, and have a beautiful summer

Markus, DF6NM
_____________________________________________________
In einer eMail vom 07.07.2006 16:48:38 Westeurop=E4ische Sommerzeit schreibt=
=20
daveyxm@googlemail.com:=20

> German EFR (Europ=E4ische Funk-Rundsteuerung) are to broadcast control=20
> signals for utility companies on 135.6kHz from a site near Budapest. Altho=
ugh this=20
> looks like a potential cause of QRM in the band, the present sites at=20
> Mainflingen (129.1kHz) and Burg (139.0) are mostly plain carrier with occc=
asional=20
> bursts of data and are fairly benign. The English PDF, linked to above, sh=
ows=20
> the new TX service area but gives no other information. The German version=
=20
> quotes it as 100kW with a 280m mast, similar to Mainflingen in erp.=20
>=20
> Info from HA6PX.
>=20
> --=20
> G3YXM IO92BK Birmingham UK=20


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<HTML><FONT FACE=3Darial,helvetica><HTML><FONT  SIZE=3D2 PTSIZE=3D10 FAMILY=
=3D"SANSSERIF" FACE=3D"Arial" LANG=3D"2">Dear Dave and LF,<BR>
<BR>
the prospect of 100 kW on 135.6 sure sounds like bad news! Even with a fairl=
y "clean" carrier, I'd expect a few problems:<BR>
<BR>
- at 600 km, it would be a signal of ~62 dB=B5V/m daytime, about 6 dB more a=
t night. As this would be in the passband of my receiver, I'll have to do a=20=
redesign with 30 dB less gain :-( <BR>
<BR>
- with 340 Hz upward shift, the FSK bursts will splatter the into the amateu=
r band, at least once every 10 seconds.<BR>
<BR>
- at night, DCF 39 is contaminated by strong Luxembourg effect from various=20=
BC stations, with a modulation depth up to a few percent and sidebands reach=
ing well into the band. Due to the inertia involved in the ionospheric heati=
ng process, they tend to be much more intense close to the carrier - 1 kHz c=
an make a big difference.<BR>
<BR>
- SXV are currently operating around 135.76 kHz FSK. They might feel incline=
d to evade QRM and move further up in frequency.<BR>
<BR>
73, and have a beautiful summer<BR>
<BR>
Markus, DF6NM<BR>
_____________________________________________________<BR>
In einer eMail vom 07.07.2006 16:48:38 Westeurop=E4ische Sommerzeit schreibt=
 daveyxm@googlemail.com: <BR>
<BR>
<BLOCKQUOTE TYPE=3DCITE style=3D"BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT=
: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">German EFR (<B><A HREF=3D"http:=
//www.efr.de/com/download/pdfs/radio_ripple_control.pdf">Europ=E4ische Funk-=
Rundsteuerung</A></B></B>) are to broadcast control signals for utility comp=
anies on 135.6kHz from a site near Budapest. Although this looks like a pote=
ntial cause of QRM in the band, the present sites at Mainflingen (129.1kHz)=20=
and Burg (139.0) are mostly plain carrier with occcasional bursts of data an=
d are fairly benign. The English PDF, linked to above, shows the new TX serv=
ice area but gives no other information. The German version quotes it as 100=
kW with a 280m mast, similar to Mainflingen in erp. <BR>
<BR>
Info from HA6PX.<BR>
<BR>
-- <BR>
G3YXM IO92BK Birmingham UK </BLOCKQUOTE><BR>
<BR>
</FONT></HTML>
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