Date: Sun, 30 Dec 2018 21:45:43 +0100 (CET)
From: Jacek Lipkowski <sq5bpf@lipkowski.org>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <5C28AE1C.1020707@posteo.de>
Message-ID: <alpine.DEB.2.11.1812302117390.1809@mailn.lipkowski.org>
References: <976652757.10789891.1546166793929.ref@mail.yahoo.com> <976652757.10789891.1546166793929@mail.yahoo.com> <5C28AE1C.1020707@posteo.de>
User-Agent: Alpine 2.11 (DEB 23 2013-08-11)
MIME-Version: 1.0
Subject: Re: ULF: Carrier on 2970.01 Hz
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

Ufortunately i didn't receive anything here. Not very exciting but i 
believe that negative results should also be reported.

The spectrograms:

https://klubnl.pl/grabber/grabber_sq5bpf_2970.png
https://klubnl.pl/grabber/grabber_sq5bpf_2970_avg.png

Right now i use the same settings as on my 5170Hz grabber: a 3kHz wide 
filter centered on 2970Hz, followed by vtblank  -a1.4 -d0 -t100 (vtblank 
from old vlfrx-tools). I would be grateful for any suggestions how to 
improve this, maybe the filter is too wide (and lets too many 50Hz 
harmonics through. which upset the blanker).

The antenna isn't optimised for ULF.

VY 73

Jacek / SQ5BPF

On Sun, 30 Dec 2018, DK7FC wrote:

> Date: Sun, 30 Dec 2018 12:38:04 +0100
> From: DK7FC <selberdenken@posteo.de>
> Reply-To: rsgb_lf_group@blacksheep.org
> To: rsgb_lf_group@blacksheep.org
> Subject: ULF: Carrier on 2970.01 Hz
> 
> Hi ULF,
>
> The accu is fully recharged and i am on the hill again, transmitting on the 
> ground loop antenna. This time, the accu has even more power. The TX power is 
> 520 W (!), the DC measurement tells i need just 64 V for 1 A, and now, at 
> 2970.01 Hz i am getting a record antenna current of 2.75 A!!
> The carrier ison the air since 11:17 UTC and i intend to run it for 2 hours 
> again, like yesterday.
>
> Reports are welcome :-)
>
> 73, Stefan
>