Re: LF: VLF-Grabber at DL0AO: Vertical antenna temporary out of service

[DK7FC <selberdenken@posteo.de>]

Hi Tom,

Thanks for the info. I'm going use it until the 30th  ;-)
Which modifications are you planning? More C and higher above the trees? 
Or will it be a different circuit. How do your isolations transformers 
work below 30 Hz?
73, GL, Stefan

Am 17.04.2019 19:10, schrieb DK1IS:
> Hello groups,
> To whom it may concern:
>
> We plan to make some improvements at the active vertical antenna of 
> our grabber vlf.u01.de . Main objectives are the extension of the 
> lower cut-off frequency down to real ELF and the reduction of noise in 
> the ULF, SLF and ELF range. Therefore the vertical antenna will be out 
> of service for some days, starting at 20190430 1400UTC. The vertical 
> signals will be absent in the exclusive vertical instances as well as 
> in the combined cardioid instances. Our LF- and MF-grabber lf.u01.de 
> will not be affected nor its Opera and EbNaut analyses.
> Comeback will be announced on the reflectors - or you`ll see it on the 
> grabber screens by yourself ;-)
> 73,
> Tom, DK1IS
> on behalf of the DL0AO team