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+--- Thread: Another New Site Review. (/showthread.php?tid=2241)
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Another New Site Review. - Phil23 - 2017-07-23
Hi All,
New Station installation completed a few hours ago & looking forward to feedback.
E-Field went in yesterday, about 150mm from memory.
First attempt at making a H-Field was completed a couple of hours ago.
To get started I make a 4 turn Moebius Loop with RG6 Coax.
It's just hanging in the outdoor area ATM & plan to re-site everything later in the week.
Right now the GPS is shaded by a double iron roof.
Don't mind the idea of building another, better H-Field, but at least it's going now.
Any advice will be greatly appreciated.
Thanks
Phil.
RE: Another New Site Review. - DelandeC - 2017-07-23
Hello,
What is your station id?
You should install the H-field pre-amp closer to the loop.
The cables should be a little shorter.
RE: Another New Site Review. - Phil23 - 2017-07-23
Station ID is 1928.
RE: Another New Site Review. - kriu - 2017-07-23
(2017-07-23, 11:10)Phil23 Wrote: Station ID is 1928.
Hi Phil!
Is the loop antenna near the metal pipe? - is it a chimney?
If so, I suggest move a little away from this metal pipe.
I also suggest to attach a coaxial wire from the E-field antenna to the mast.
Good luck during system configuration - this is not a simple matter.
RE: Another New Site Review. - Phil23 - 2017-07-23
(2017-07-23, 11:31)kriu Wrote: Is the loop antenna near the metal pipe? - is it a chimney?
Yes, a heater flue. Not it's final location yet, need advice on that.
Also needs the Coax to the Amp tidied up & shortened.
I should maybe have mounted the junction box higher, it's currently 200mm below the loops.
Quote:I also suggest to attach a coaxial wire from the E-field antenna to the mast.
The TV antenna is not used, so it can be removed to help improved the E=field install,
Temporary initial install beating the dark last night...
Phil
RE: Another New Site Review. - pasense - 2017-07-23
Hi Phil,
the roof of corrugated iron will shield the loop antenna quite well, so when you place it on top of the roof or somewhere outside the H signals will go up considerably. The E signal appears to have a quite high noise of higher frequencies; maybe a filter would help. If you can find the source of this noise and remove it, it would be better but that may be hard to achieve.
RE: Another New Site Review. - Phil23 - 2017-07-23
(2017-07-23, 12:51)pasense Wrote: The E signal appears to have a quite high noise of higher frequencies; maybe a filter would help. If you can find the source of this noise and remove it, it would be better but that may be hard to achieve.
When you say High Frequencies, around which bands?
I have quite a few 433MHz transmitters monitoring control devices, all on 433.4MHz. They are all in default config of 100mW (20dBm).
I may well be able to lower their transmit power.
A few other 433's I can't reconfig. Also the Davis Pro2 is in line of site from the E-field about 10m away.
Wifi access points are fairly dense in my area also, including 4 in my residence.
Would like to understand a bit more about reading the noise figures so they can help me when I correctly site it.
Phil
RE: Another New Site Review. - pasense - 2017-07-23
Hi Phil,
"high frequency" is here relative to the frequency range of the lightning signals, and that's up to something like 30 kHz (or 30 kilocycles/sec), not anything like in the MHz range.... Just a bit above audible range. But in the signal plot of your lightning list I can see a quite regular (almost periodic) signal in the E channel and a broad noise in the frequency range above 30 kHz. Since it is always there I think there is some continously running noise source close by, but what is is I can't say. Could be a malfuctioning power supply in your house or one of a street lamp....
The noise signal does not appear in the H channels.
RE: Another New Site Review. - Phil23 - 2017-07-26
(2017-07-23, 12:51)pasense Wrote: The E signal appears to have a quite high noise of higher frequencies.Found it. Around 30+kHz was coming from the Motorola 1 Amp power supply I was using.
If you can find the source of this noise and remove it, it would be better but that may be hard to achieve.
Need to find a suitable replacement.
What do others think of using a more basic Linear supply.
IE older transformer type plug pack with something like a 7805 instead of a switch mode charger.
Phil.
RE: Another New Site Review. - allsorts - 2017-07-27
Nothing wrong with a linear power supply and 7805. The lack of noise is a positive advantage. Lower effciency is the draw back but what is a couple of Watts?