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1. LF: RE: Re: Re: VLF 9 kcs: preamp and antenna noise (score: 1): Author: Rik Strobbe <[email protected]>; Date: Sun, 6 Jun 2010 17:49:56 +0200; Clemens, As Markus says the noise at VLF is around 140dB kTo, so one could 'afford' an antenna loss of 102dB to have a 10dB SNR margin with a NF of 28dB. That's an antenna efficiency of 0,00000001585; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00429.html (22,178 bytes)
2. LF: Re: Re: Re: VLF 9 kcs: preamp and antenna noise (score: 1): Author: <[email protected]>; Date: Sun, 6 Jun 2010 07:09:59 -0400; Jim Sensitivity of the Perseus drops off below 10 kHz - see attached spectrum shot taken earlier this year. While the antenna in use at that time dropped off a few dB below 10 kHz the 'black hole' is; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00698.html (13,895 bytes)

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