Re: LF: RE: 300 mA on 8270 Hz

[DK7FC <selberdenken@posteo.de>]

Hi Luis,

Thanks for the informative answer.
IM98xn, a nice location! Can you tell the locator more detailed? :-)
Well, a 1m probe, a 6m pole on the top of a house, that should work very well.
The QRM comes and goes.
If you have the time and fun you could drive on a hill where no QRM is present. Then use a notebook and SpecLab and record one or two hours and produce a nice spectrogram. Just to see that the RX is working well. Maybe when the Alphas are back.
Or maybe the QRM is coming from a local coupling path / contaminated earth?

73, Stefan

Am 24.09.2017 16:17, schrieb VIGILANT Luis Fernández:

Hi Stefan, VLF

Yes. I agree there is work to be made reducing the noise picked by the antenna. Or directly looking for

an alternative Rx site which less noise

The VLF Rx is already running at my remote Rx location at 7Km from Benidorm. But it is a populated area

with close neighbours, street lights, etc. The probe is on top of the roof in a 6m pole. Last 1m section made

with PVC pipe. The location is IM98xn, close to the sea and not very high.

The antenna probe is 1m alu rod 10mm diameter. The MiniWhip is also attached to the last 1m PVC pole

https://www.dropbox.com/s/1th9zu3neujbn1l/IMG_20170521_173617.jpg?dl=0

I'm using one of your designs, with separated front end right at the probe and the rest down in the shack

using about 20m 75Ohm TV coax. The details can be found at G3XBM site (fully recommended)

https://sites.google.com/site/sub9khz/antennas

Will be hard to reduce the noise at this site. So the "B plan" is to build a new E probe and use an spare PC

to setup a new receiver. I will test this in different locations I can "borrow" and find if it works in any of them

But first in my "To-Do" list is VLF. I'm almost ready to go with 100w just needing some more work

Keep tuned ! ;-)

73 de Luis

EA5DOM