LF: PA0RDT-ECO-Mini-Whip

[DK1IS <DK1IS@kabelmail.de>]

Hello Roelof,

concerning your lastest ECO-Mini-Whip: very exciting stuff! Would you 
already release a schematic? What about the lower frequency limit - 
could it be extended to VLF/ULF?
Tu es 73,
Tom, DK1IS

Am 15.01.2018 um 11:08 schrieb Roelof Bakker:
> Hello Graham,
>
> The answer to your question in regard to the difference in signal
> strength might be a new antenna that I am testing at the moment. It
> runs on a 6V gel cell battery and has a massive power consumption of
> 40 mW, compared to 800 mW for my standard mini-whip design. This one
> is called the pa0rdt-ECO-Mini-Whip!
>
> The signal level around 400 kHz is 6 dB less, yet at daytime the
> band noise is still 10 dB stronger than the receiver noise floor of
> my PERSEUS which has a noise figure of 18 dB.
>
> Gain is -14 dB, IIP2 = +72 dBm and IIP3 = +38 dBm using + 6 dBm test
> tones and tested with a test system with an OIP2 = + 120 dBm and
> OIP3 = + 60 dBm.
>
> 73,
> Roelof Bakker, pa0rdt
>
>
>
>
> .