Re: LF: Re: HB9ASB...

[Daniele Tincani <danieletincani@yahoo.com>]

Yes I'm sure it works. BTW, I work in the optical networks area of a well-known (swedish) company of telecom equipments, so I really trust optical comms ;-)

The interesting thing would be to compare in a very quiet location an active, optically-coupled E-probe, with very short copper leads, just for the battery; and another identical E-probe, installed at the same height, on a similar pole, etc. with "conventional" feeder through a coax cable. Just to see what changes.

I mean, if the cable actually is an integral part of such an antenna ("the cable is the real antenna", as I read sometimes in comments about the MiniWhip), I would expect a significant improvement from using a coax rather than fiber. It would be necessary to find a very quiet location for such test, to prevent local hum from giving an obvious advantage to the fiber solution.

Regards

D.

 

From: Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Sent: Thursday, August 11, 2011 2:46 PM
Subject: Re: LF: Re: HB9ASB...

Hello Roelof, Daniele, LF,

Yes, it works.
Before i started with the VLF stuff in February 2010 i did tests with LF active antennas, battery supplied, and signal transfer by fiber optic cables. Actually it worked well with a single BF862 with the TX LED in the drain-to-plus stage and a 9V battery. This was an interesting alternative.

But later i started with the LF grabber and so it becomes inpractical since i don't want to replace a battery all the time and thought a solar module might be covered by snow in winther and so on...

Nice stuff to experiment. Anyway you have to be in a quiet location but noise transfer on a coax screen was history... It also worked on a multi turn loop which i used in France last year...

73, Stefan/DK7FC


Am 11.08.2011 14:33, schrieb Roelof Bakker:
> Hello Daniele,
>
> I have the parts on hands, but house restoration has prevented tests so far.
> I will report in due time.
>
> However Stefan has used an optical link with a 30 cm active whip.
> So, it certainly will work.
>
> 73,
> Roelof