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Date: Tue, 04 Sep 2018 09:08:57 +0200
From: DK7FC <selberdenken@posteo.de>
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Content preview: Roman, ULF, Some more thoughts. This distance is in the far
field for frequencies down to 870 Hz. In my view, it is out of the range
of 'local tests'. Think about the GHz guys operating above 100 GHz. They deal
with the same distances and spend the same efforts and money :-) It and it
is my goal to go down as deep as possible. It is a pleasure to work with
this type of antenna and i can already see that it outperforms my large inv-L
below 3 kHz. The ease of use is fascinating. You don't need a coil to resonate
it and you don't need to hande high voltages (although i like high voltages
:-) ). For this antenna, the limiting factor is the TX power and time! I
need to transmit from batteries and stay there during the transmission, so
i can't run a carrier for weeks. But i could apply 2 kW! :-) So far i managed
to apply 255 W (RF) and the goal is to reach 500 W. In a next step i need
to improve the RX site since the small loop becomes quite deaf below 2 kHz
it seems. [...]
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Subject: Re: ULF: Carrier on 2970.005 Hz
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Roman, ULF,
Some more thoughts. This distance is in the far field for frequencies
down to 870 Hz. In my view, it is out of the range of 'local tests'.
Think about the GHz guys operating above 100 GHz. They deal with the
same distances and spend the same efforts and money :-)
It and it is my goal to go down as deep as possible. It is a pleasure to
work with this type of antenna and i can already see that it outperforms
my large inv-L below 3 kHz. The ease of use is fascinating. You don't
need a coil to resonate it and you don't need to hande high voltages
(although i like high voltages :-) ).
For this antenna, the limiting factor is the TX power and time! I need
to transmit from batteries and stay there during the transmission, so i
can't run a carrier for weeks. But i could apply 2 kW! :-) So far i
managed to apply 255 W (RF) and the goal is to reach 500 W.
In a next step i need to improve the RX site since the small loop
becomes quite deaf below 2 kHz it seems.
73, Stefan
Am 04.09.2018 08:18, schrieb DK7FC:
> Hello Roman,
>
> The distance between RX and TX is 55.6 km in all these experiments,
> also on 2970/2470/1970 Hz. The report for 1570 Hz (the 191 km band)
> will follow today.
> Unfortunately this loop has its minimum pointing to Russia and the ERP
> is very low so it is most unlikely to receive a signal from this antenna.
> But the ongoing transmissions on 17.4701 kHz could be received
> relatively easily in 3000 km distance.
>
> 73, GD DX,
> Stefan
>
> Am 03.09.2018 23:37, schrieb Roman:
>> GA Genosse Funkamateur Stefan!
>>
>> Vielen dank!
>> MNY TNX for info!
>>
>> Tell me pse, whats QRB on your DFCW-90 experiment and on 2970|1970 Hz?
>>
>> Best DX in your experiments!
>> All russian LF looking to your experiments! -)
>>
>> 73!
>> Roman
>