|Subject:||Re: LF: testing VLF grabber|
|From:||"Max IK0VVE" <[email protected]>|
|Date:||Fri, 6 May 2016 23:30:46 +0200|
|References:||<[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>|
I do not have time to reach you that you already run away to lower frequencies, HI.
I passed the last nights to try to discipline my audio board with my 1pps GPS... nothing to do, I've tried all, levels, phases, etc... I followed the Wolf's tutorial without success. I suppose duty cycle is to low. I'm waiting for a new GPS so I'll try with that or in the worst case with an OCXO+GPS 10khz.
So only for test now I'm pointing to German LF station DHO. Inserted BP and NB and moved to about 100uHz the resolution of the grabber.
Tomorrow a little trip, not so far, to an Ham friend to listen if his zone is quieter than where I live.
I'm interested to your Raspberry Pi remote system, can we get more informations?
Thanks, 73, Max IK0VVE
...here some of my HAM Radio projects...
Data: Tue, 03 May 2016 11:32:55 +0200
Oggetto: Re: LF: testing VLF grabber
Perfect. A nice progres!
Am 03.05.2016 02:47, schrieb Max IK0VVE:
Yes, a local site in just a few km distance is a very nice thing! And it may be better to have your own site, without any neighbours who could run a noisy power supply. When it's all your, then you can remove, replace, modify any QRM sources without discussions and compromises!
Do you also plan to run it with solar power? My system has no problems any more since the end of February. And in winther there were a few things running sub-optimal since the project was very new to that time.
Oh, that's very far. I rather expected something like 20 km.
Hmm, he doesn't tell us.
What does that mean? An overloaded RX? With such a large antenna on the soundcard you will need a low pass filter. Simple RC chains would work well. Maybe 2x 10kOhm + 1nF.
Yes sure. These days i am very convinced from loops.
If you also want to use a Raspberry Pi for remote controlling the system, you can easily use some mono stabile relays to switch between different antennas, maybe 2 loops and an E field antenna.
73, all the best
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