Earth connection
#1
I have been using the H field magnetic loops with good success.
Unfortunately  allowed the amplifier to get wet, so I am currently dealing with that.

So just now I am operating with the E field antenna only - used with the on board antenna.

I do not have the earth terminal on the back of the controller connected to anything.
Should I connect this and to what - an earth stake? how close to the E-field antenna?

Any other thoughts on the E-field sensors would be appreciated.

Chris. Huh
Stations: 2332
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#2
I found much lower noise when I connected my Blue system to earth - I used the earth from the power socket by using a power plug with only the earth connected. My e-field probe is made from 2.5mm wire and is 200mm long  edit 100mm - I have it mounted on my roof as it must be a few metres above the ground to work properly. It's connected using quad shield coax - it works 3 times better than my h-field ferrites - I could disconnect them and not miss any strikes. I'm down south near Wollongong.
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Stations: 2039
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#3
(2018-12-30, 07:35)vk2him Wrote: I found much lower noise when I connected my Blue system to earth - I used the earth from the power socket by using a power plug with only the earth connected. My e-field probe is made from 2.5mm wire and is 200mm long  edit 100mm - I have it mounted on my roof as it must be a few metres above the ground to work properly. It's connected using quad shield coax - it works 3 times better than my h-field ferrites - I could disconnect them and not miss any strikes. I'm down south near Wollongong.

Many thanks for your reply via Blitzortung.
And also for the earthing comments.
I have the E field sensor encased in poly-pipe and it is high in a tree in my front yard.
I have had to disconnect my H field loops (more below) and have not connected my e-field sensor till now,
as I had a display of Christmas lights in the front yard. I was concerned that the currents in these would give false triggering.
So now, having taken all that down, the E-field sensor is connected.
It seems to be giving reasonable signals, but I think a "long" wire vertical will be a better idea.
When I looked at the signals it looked like 50Hz interference being received, until I realised that the horizontal axis is in microseconds, and not milliseconds.
So I guess it is working OK.
Two projects to come - (1) connect an earth, and maybe the way you have done it is best, rather than a stake, and (2) a longer wire for the E-field antenna.
I've only had the E-field connected for a few hours, so it remains to be seen how good a sensor it is, and if better with the longer wire.

I had the H-field antennae working very well.
I used crossed 1m square loops in 3-dimensions, 7 turns each of heavy enameled copper.
They loops were under the eaves, as was the GPS antenna (brilliant little helical).
I decided to move the loops out clear of the house for a better "view" and had the H-amps enclosed in a sealed box.
Well, the sealing didn't turn out to be as good as I hoped!!!
And water got in to the pre-amp 3-channel H board. Not too much, but enough to give nasty tracking down the board.
However much I cleaned it (toothbrush and elbow grease) it hasn't worked since, although its LED shows power.
So this will have to be replaced. 

Anyhow, many thanks for your response.
I'll implement the earth, and also increase the antenna size.
Stations: 2332
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#4
(2018-12-30, 08:37)cjabar Wrote: I'll implement the earth, and also increase the antenna size.

Trust me that when it comes to the E-Field, larger is not better! It's not actually an antenna, it's a probe that measures the change in current charge rather than receiving a "radio" signal - It's also why you need the probe a few metres above ground. As a guide, my 100mm probe is picking up strikes consistently from NZ, Papua NG, Indonesia and the whole Australian continent. I live in a rural area with a few electric fences around me and connecting the earth reduced the noise from these. I have my E channel gains set to 16x10 with threshold of 90 mV with 18mVPP noise.

How long is your E field? P.S. I have a set of Christmas Solar LED lights permanently connected around the edge of my deck and they never cause any noise.
PPS - I can't find your station listed in this list which is odd? My Station is usually near the top indicating relatively good performance.
http://en.blitzortung.org/station_list.p...ry=Oceania

- Cheers Ian
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Stations: 2039
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#5
thats true ,but i i have no 1pps on my gps antenna what the best to do ?
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#6
(2020-05-30, 19:32)GJ7DNI Wrote: thats true ,but i i have no 1pps on my gps antenna what the best to do ?

Hi,
I'd perform the following checks.

1) Is the blue GPS LED pulsing?

2) Have a look at the "GPS 1PPS" pulse on the Signals page.
In the web frontend of the station go to Signals -> Signals Tools -> for sampling select the channel "GPS 1PPS" -> start
It should look somehow similar to this.
   

3) Is there communciation between the CPU and the GPS ongoing.
In the web frontend of the station go to Settings -> System -> Debug and select "Debug GPS" -> Apply
Then go to Tools -> System -> Debug Log...
You should see so called NMEA sentences.

Code:
2020-05-31 06:16:11 183249.8 | GPS-1PPS: Difference 37 ticks
2020-05-31 06:16:11 183250.3 | GPS: 45101475 | GNGGA,061612.000,4807.4732,N,00820.0284,E,2,13,0.87,829.3,M,48.0,M,0000,0000
2020-05-31 06:16:11 183250.3 | GPS: 45551021 | GPGSA,A,3,19,13,15,24,12,,,,,,,,1.22,0.87,0.86
2020-05-31 06:16:11 183250.3 | GPS: 45954849 | GLGSA,A,3,66,67,86,,,,,,,,,,1.22,0.87,0.86
2020-05-31 06:16:11 183250.3 | GPS: 46388379 | GAGSA,A,3,19,21,13,01,27,,,,,,,,1.22,0.87,0.86
2020-05-31 06:16:11 183250.4 | GPS: 46972695 | GPGSV,4,1,13,24,86,338,16,12,54,239,17,19,45,077,18,17,32,051,16
2020-05-31 06:16:11 183250.4 | GPS: 47525899 | GPGSV,4,2,13,15,30,180,39,36,30,150,39,25,24,242,,10,16,284,
2020-05-31 06:16:11 183250.4 | GPS: 48079013 | GPGSV,4,3,13,32,14,319,,13,11,155,40,20,06,253,,28,03,057,15
2020-05-31 06:16:11 183250.4 | GPS: 48326003 | GPGSV,4,4,13,06,03,106,
2020-05-31 06:16:12 183250.4 | GPS: 48910281 | GLGSV,3,1,09,76,67,014,16,67,41,298,24,66,36,226,39,77,36,283,
2020-05-31 06:16:12 183250.4 | GPS: 49463393 | GLGSV,3,2,09,85,33,055,,86,27,120,30,75,27,071,19,68,10,342,
2020-05-31 06:16:12 183250.4 | GPS: 49694139 | GLGSV,3,3,09,84,04,006,
2020-05-31 06:16:12 183250.4 | GPS: 50278187 | GAGSV,2,1,08,21,71,049,14,01,51,263,23,04,45,285,,19,38,202,34
2020-05-31 06:16:12 183250.4 | GPS: 50831437 | GAGSV,2,2,08,13,19,104,23,27,19,069,17,15,19,051,,09,09,327,
2020-05-31 06:16:12 183250.4 | GPS: 51428987 | GNRMC,061612.000,A,4807.4732,N,00820.0284,E,0.16,155.53,310520,,,D
2020-05-31 06:16:12 183250.4 | GPS: 20-05-31 06:16:12 lat:48.124554 lon:8.333807 alt:829.3 sat:13 inview:30 fix:3 integr:D pdop:1.2 status:A
2020-05-31 06:16:12 183250.4 | GPS: ===========================================
2020-05-31 06:16:12 183250.8 | GPS-1PPS: Difference 35 ticks
2020-05-31 06:16:12 183251.3 | GPS: 44438537 | GNGGA,061613.000,4807.4728,N,00820.0284,E,2,13,0.87,829.3,M,48.0,M,0000,0000
2020-05-31 06:16:12 183251.3 | GPS: 44888175 | GPGSA,A,3,19,13,15,24,12,,,,,,,,1.22,0.87,0.86
2020-05-31 06:16:12 183251.3 | GPS: 45295415 | GLGSA,A,3,66,67,86,,,,,,,,,,1.22,0.87,0.86
2020-05-31 06:16:12 183251.3 | GPS: 45730355 | GAGSA,A,3,19,21,13,01,27,,,,,,,,1.22,0.87,0.86
2020-05-31 06:16:12 183251.3 | GPS: 46330087 | GNRMC,061613.000,A,4807.4728,N,00820.0284,E,0.30,165.49,310520,,,D
2020-05-31 06:16:12 183251.3 | GPS: 20-05-31 06:16:13 lat:48.124546 lon:8.333807 alt:829.3 sat:13 inview:0 fix:3 integr:D pdop:1.2 status:A
2020-05-31 06:16:12 183251.3 | GPS: ===========================================

If none of this is working, check the soldering.

Klaus
Stations: 2065
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#7
O YES THANKS
I HAVE DONE THAT BUT ON DEBUG SHOWS NUMBER COUNT WAS HIGH , I WILL MOVE GPS ANTENNA TO GOOD SKY VUE,WHEN NEXT WEEK MY NEW 15M LEAD GETS HERE ,
SO I AM NOT ON MAP DUE TO THIS 1PPS ISSUE ?
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#8
YES SO LOOKING A BUG LIST SHOWS COUNTER IS 84082120 SHUOLD BE AROUND 84000000
GPS INACCURTE
I HAVE NO VIEW TO THE WEST AT THIS TIME AND NOT ALL SATS AERE IN GREEN .

BLUE LIGHT YES BUT ONLY AT START UP.
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#9
Do not shout at me, please.

You seem to be a "registered forum member" but not a "participant". Did you register your station?
If you did but it doesn't work, enter a comment with your issue here: https://forum.blitzortung.org/showthread.php?tid=2764&highlight=register

Which counter and high number count are you talking about?
Stations: 2065
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#10
(2020-05-31, 07:11)GJ7DNI Wrote: O YES THANKS
I HAVE DONE THAT BUT ON DEBUG SHOWS NUMBER COUNT WAS HIGH , I WILL MOVE GPS ANTENNA  TO GOOD SKY VUE,WHEN NEXT WEEK  MY NEW 15M LEAD GETS HERE ,
SO I AM NOT ON MAP DUE TO THIS  1PPS ISSUE ?
My guess is that the lead is a little bit long with 15M.

>>> The built in GPS module is very sensitive and works with antennas connected by lines of up to 10 meters. <<<
Regards,
Jack

Station: 2588
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#11
hi jack ,sorry for caps.
i will cut off what i can to be less that 10mts
then i hope the gps 1pps will work to sent data out as i am loged in the two systems.

regards steeve
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#12
(2020-06-01, 08:27)GJ7DNI Wrote: I will cut off what I can to be less than 10mts
Then I hope the GPS 1pps will work to sent data out as I am loged in the two systems.

regards steeve

Try the cable as it is first, before cutting and shortening it. Perhaps the longer length will work, who knows?
Regards,
Mike W.
Stations: 1977, 2294
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