Re: VLF: Inspire VLF-3 receiver + samole rate drift problems

[Jacek Lipkowski <sq5bpf@lipkowski.org>]

Danielle,

Like Stefan said - try to put a simple e-probe antenna on the roof. i use 
a PA0RDT mini-whip modified for better low frequency response with 50cm of 
wire as the antenna, and some lowpass filtering/amplification in the 
shack. so far the results were great.
The E-field from powerlines is screened out by the buildings themselves, 
while the H-field is not. So in the city you will get less interference 
from an E-probe on the roof.
Remember the lowpass filtering - whatever you do, try to connect a simple 
lm386 based amp to each stage, if you hear radio stations, then you need 
more filtering :) Also check if you get a line at 9kHz on the spectrogram 
(his is intermod from radio stations), it means more filtering is needed.
Good luck

Jacek / SQ5BPF