Re: LF: Re: Mini-Whip Antenna

[Daniele Tincani <danieletincani@yahoo.com>]

Hello Roelof,

 

what do you mean exactly by "difficult cases"?

 

Regards

Daniele

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From: Roelof Bakker <roelof@ndb.demon.nl>
To: rsgb_lf_group@blacksheep.org
Sent: Fri, January 14, 2011 5:36:08 PM
Subject: Re: LF: Re: Mini-Whip Antenna

> Hi Roelof,
>
> Some interesting comments there.
>
> On the topic of feeder pick up Alan G3NYK and myself have had many
> conversations over the years about ways to deal with the problem and a
> method we've never got around to trying but I now have some components
> to try (when I get a "roundtooit") is to convert (E/O) electrical to
> optical at the feedpoint and then conduct by fibre through the noise
> field converting back to demodulated baseband in the shack. The problem
> of powering the feedpoint equipment may be overcome by using batteries
> (possibly solar-charged) thus avoiding further noise pick up and
> re-radiation from power source cabling.
>
> 73

Yes, this is an excellent idea and to be honest I have already acquired the necessary parts for some time, but have not come round yet to use them. An other idea that I have tested and can give excellent results in difficult cases is to use CAT5 network cable.
I used rf-isolating transformers at both ends for the signal pair and common mode chokes at both ends for the pair carrying power to the antenna.

73,
Roelof, pa0rdt