Message-ID: <001201c3dc70$d13894e0$a2fb7ad5@oldpc>
From: "Lech Laszkiewicz" <Lechlaski@btinternet.com>
To: rsgb_lf_group@blacksheep.org
References: <C75A388845B4B54B9CF5E2ADB589B0E3031AEFA6@btss.siemens-pse.sk> <1AgPdH-1ZJ71l0@fwd11.sul.t-online.com> <004701c3da25$425ad500$2102000a@ibm> <00b501c3daa2$fed47740$2701a8c0@lubon>
Date: Fri, 16 Jan 2004 20:38:39 -0000
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Subject: LF: Re: Re: new here..little introduction
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I use 1.5Kw TX on136KHz. My nearest neighbours are only 10metres from my
Marcconi "T" antenna and over last 3 years they had no interference on their
MF nor VHF radios, television sets, terrestial and satellite. They use their
computers a lot with no interference. I have advised them of my rsdio
activities and I receive no complaints. Maybe I am just lucky.
73 de Lech, G3KAU
----- Original Message -----
From: "Marek SQ5BPM" <sq5bpm@wp.pl>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, January 14, 2004 1:33 PM
Subject: LF: Re: new here..little introduction


> > Sofar I haven't seen any reports of interference caused by 136kHz
> > stations to consumers electronic devices.
> > Wonder how serious is the possibility of interfering in audio-equipement
> > in the neighbourhood??
>
> Hi all,
>
> The only interference we found in our club was with our remote HF antenna
> switching equipment: LEDs connected to long, ca. 40m long cables going to
> remote relays glow during the transmission. These are probably not fully
> decoupled from RF, but this is not at all annoying, even better, this
gives
> a visual sign of the transmitted signal HI.
>
> Additionally there is one rotor controller's "mouse" which is easy to get
> interferred by LF as well as HF. It has it's cable unshielded and
connected
> straight to the uP inside the controller, so this is normal.
>
> Apart of that there is no known interference in our club and it's
> surrounding caused by LF at all. Which unfortunately cannot be said about
> higher frequencies, which easily get into audio & TV equipment ca.
100-150m
> around the club... 25W of average power ATV on 70cm makes visual "ghosts"
on
> other TV signals. 50W on 50MHz or 144MHz usually causes a total "blackout"
> in our closest neighbours' TVs, don't ask what happens if we transmit
using
> a little more power. HF causes interference only above ca. 250W, most
> problematic being the highest HF bands.
>
> However 400W of input power on 136kHz makes zero interference.
>
> ===
>
> I will try to be active on LF this weekend at last, starting on Friday. It
> takes me more than an hour to prepare the TX and antenna plus QRSS QSOs
are
> time-consuming so I must be certain I have at least a few hours of spare
> time, if I want to get active...
>
> 73! Marek SQ5BPM
> SP5ZCC Scouts Radio Club
>
>