Hello Roelof,

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




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