Antennas for System BLUE - Mini Guide

[chubros]

Minor difference if any

Richo if so, what do you suggest between those two. I  was trying to make a loop for my system blue and i m a lit bit lost.
Simple loop or mobius (with or without trafo? )
I m asking cause i just have started to make a 38cm brake pipe mobius with trafo as in your example above and right now  i m making my first windings.

[RichoAnd]

38cm "brake pibe" appears simple and robust, and is excellent for outdoor use


/Richo

[chubros]

38cm "brake pibe" appears simple and robust, and is excellent for outdoor use


/Richo

So i shall continue my windings... 30 only left...
Ah. One more question... About the inner core should i prefer 2,5mm copper wire? Ι had plenty of 1,5mm available.
Should i use it or not?
Thanks in advance

[bazzaC]

Richo,

I have started making the H field Copper tube Loop antenna shown in your mini guide and also from http://users.skynet.be/DanielV37/Project...m#Hardware.  I have produced 3D print files for the top & bottom Junctions from the drawings on that site and have published these files at http://www.thingiverse.com/thing:1713141 .  I have included attribution to the design as best I could find reference.  Can you have a quick look at this url and advise if any further attribution is needed.

thanks
Barry (Australia)

Have a lot of suggestions for changes - water intrusion is a challenge

By the way - time has run from this antenna - it is too large, and intended for System GREEN
Make it of brake tube 5-6 mm and a diameter of ~ 40cm
Most effective is the "Möbius" with transformer

Richo,

thanks for your earlier advice. I have just commissioned by System Blue (ID=1631) and as per your suggestion I have built a paired 38cm diam Copper Pipe loop (6mm air condition tube) with 50 turn Toroid Ferrite Transformer.  After a false start with the ethernet wiring and then playing with the gain and thresholds I think it is performing quite well (noise floor about 19mV & effective detection ratios compare well to other stations in the area).  I didn't worry about O ring seals at this point I will use silicon sealant later to keep moisture out (but it won't stop the ants !!)

For others wanting 3d print the top & bottom brackets (or to look at more pics to seed their own designs) I have put them at http://www.thingiverse.com/thing:1792866

regards
Barry

[chubros]

Richo,

I have started making the H field Copper tube Loop antenna shown in your mini guide and also from http://users.skynet.be/DanielV37/Project...m#Hardware.  I have produced 3D print files for the top & bottom Junctions from the drawings on that site and have published these files at http://www.thingiverse.com/thing:1713141 .  I have included attribution to the design as best I could find reference.  Can you have a quick look at this url and advise if any further attribution is needed.

thanks
Barry (Australia)

Have a lot of suggestions for changes - water intrusion is a challenge

By the way - time has run from this antenna - it is too large, and intended for System GREEN
Make it of brake tube 5-6 mm and a diameter of ~ 40cm
Most effective is the "Möbius" with transformer

Richo is that connection correct?

[RichoAnd]

Richo,

I have started making the H field Copper tube Loop antenna shown in your mini guide and also from http://users.skynet.be/DanielV37/Project...m#Hardware.  I have produced 3D print files for the top & bottom Junctions from the drawings on that site and have published these files at http://www.thingiverse.com/thing:1713141 .  I have included attribution to the design as best I could find reference.  Can you have a quick look at this url and advise if any further attribution is needed.

thanks
Barry (Australia)

Have a lot of suggestions for changes - water intrusion is a challenge

By the way - time has run from this antenna - it is too large, and intended for System GREEN
Make it of brake tube 5-6 mm and a diameter of ~ 40cm
Most effective is the "Möbius" with transformer

Richo is that connection correct?

Yes  - That is right 

[Ranieri]

For ferrite antennas use of heat shrink is a good idea?

[RichoAnd]

They are supplied with shrink tape.
If you make them yourself, you might as well use insulating tape or "GafferTape" or any other tape or varnish

[LaurentB]

Hi All,

For a multi turns loop with 25m (1.5 diamater) long copper wire we have many possibilities between diameter/number of turns.

Is there an optimum: diameter 1000mm, 3 turns or diameter 380mm, 20 turns as show in the guide or can we build any diameter/turns (inductance is an issue ?) ?

Thanks,
Laurent

[RichoAnd]

Size of the signal is proportional to the total area of the loop
Read my "mini-guide" about what is necessary
Larger antennas can cause problems.
/Richo

[LaurentB]

Thanks Richo,

I'll start with a 60cm diameter, 12 turns.

Hope I'll be soon at position 1 in blue queue

Laurent

[BertSP]

Just received my Blue. I just want to verify my understanding of the jumpers for the ferrite antenna. If ferrite, I do NOT solder the jumpers? Solder only if using Loops.

[allsorts]

Correct.

Oh pooh "correct" is too short an answer!

[BertSP]

Correct.

Oh pooh "correct" is too short an answer!

My assembly on a Blue is finished. The (stupid) question I now have is how to properly connect the two ferrites to the amp. Is it +1 and Ground or +1 and -1.  The pattern will be the same for ferrite 2... My signals seem all to have a +0.04v bias to them, both on the E and H signals.  My station is 1691.  I do have the proper shielded cables.

[allsorts]

Loops or ferrites connect to the + and - terminals on the preamp.

A small positive offset of a similar size on all channels is a normal "feature". Mine is +30 mV +/- 10 mV.

Occasionally Ch1A will jump to -190 mV but this isn't reflected on the controller status pages. However I have just noticed that it is included in the strike data uploaded to Blitzortung.