ADS-B folded vertical - Interest check

[9a4qv]

http://ads-b-antenna.blogspot.com/

Thanks,
Adam

[Anmer]

Please see the Forum rules about advertising:

No Advertising:
The forum must not be used as an advertising medium for companies who merely want to promote their business or products. Members do not want useful information diluted with posts that are nothing more than advertisements.

[9a4qv]

OK, sorry for that,
I can not delete the complete post as user, so you can do it as the admin.

Adam

[Anmer]

I'll leave the post as it may be of interest but you are selling the antenna so it is promoting a chargeable product, albeit a low cost one.

[9a4qv]

OK, thanks for that,
Well it is more like giving considering the price  and the idea is to help the guys with the static problems and make my inbox lighter from such a messages.

Anyhow, it is just the interest check to see if the guys are OK or not with the presented idea.

Adam

[IanH]

You might want to post some screenshots of results compared to something everyone knows, eg a magmount.

I have no idea what advantages this antenna offers over what is already available - all the science means nothing to me.

I'll leave those more knowledgeable in antennae to comment on possible benefits to the average user.

[Truetrack]

Frankly I can not see any advantage above the existing antennas.
True - folding a monopole to ground is a long proven design and widely used
on low VHF "Groundplanes" with sloped radials.

What is not said - mechanical mounting and weatherproofing
e.g. keeping the precipitation off its base and ground plane.

Within its limits I do not expect any wonders anyway.

[shakysen]

Well folk's I've been trying out all kinds of 1090 antennas out of late. In my opinion the 2 mag mounts supplied with the SBS3 and PUCK placed on a Steel ground sheet . Indoors works Better then my TMRF 1090 with pre amp outdoors

                                                      Shaky

[Anmer]

In my opinion the 2 mag mounts supplied with the SBS3 and PUCK placed on a Steel ground sheet . Indoors works Better then my TMRF 1090 with pre amp outdoors

Can't say I share the same experience.  Where is the TMRF located?  Is it higher than the magmounts?

[shakysen]

Hi Boss. My 2 mag mounts are on a 24 ins sq sheet in the apex of the loft. The TMRF is above them on the stack. I'm going to leave it set up few  a few days then see which is best for Sharing Boss

                                                                             Shaky

[9a4qv]

Magmount? What is this, a orriginal DVB-T stick antenna?

So I made a comparison test, even this is not the proper way to do it, but the guys does not like a science so here it is:

Test setup:

ANTENNA => 12mtrs RG-213 caoxial cable => LNA4ALL => 2mtrs LDF-400 coaxial cable => 8 pole interdigital filter => DVB-T stick with E-4000 tuner

Using the filter I can leave both AGC on and have the benefit of 20dB gain of LNA4ALL.
I use 3 antennas for the comparison test:

1. Folded monopole (1030-1090 MHz)
2. Ground plane (Tuned for 1090 MHz)
3. Magnetic base DVB-T dongle antenna on the metal ground

As expected, the best performance was with the folded monopole (100%)
Ground plane performed very well, almost as the folded monople but the maximum distance was a bit shorter (90 %). The worst was DVB-T antenna where the maximum distance over the certain period was around 60% of the folded monopole.

Conclusion:
the ground plane performed very well and due to simplicity and easy to make it can be a "best buy" but the lack is that the antenna is not a C grounded and static problem remain. (It is true, it can be solved quite easy)
The magnetic base DVB-T antenna performed as it should as this antenna is designed for the 600 mhz frequency and if shorted a bit may reach the ground plane performance. Like this, put of the box it is ok if there is nothing else to use.

It will be interesting, to see the performance of the systems using the three mentioned antennas but not using the LNA and the filter. In that case, the difference may be even bigger.

Adam


[Attachment deleted by Admin to save file space]

[Anmer]

Magmounts generally refer to antennae supplied with specialist receivers, such as the MD-1100SBS or MD1105:

http://www.taylormaderf.co.uk/page13/page48/rapidcart-76/store.php

In my experience these perform very well though antenna height and short coax runs are key influences on reception.

[shakysen]

The 2 mag mounts are MD1100SBS. Spaced 1 full  wave Length apart.


                                                            Shaky

[9a4qv]

Magmounts generally refer to antennae supplied with specialist receivers, such as the MD-1100SBS or MD1105:

http://www.taylormaderf.co.uk/page13/page48/rapidcart-76/store.php

In my experience these perform very well though antenna height and short coax runs are key influences on reception.

It looks like this a colienar antennas, and they can perform well.
The only minus is that they are using lossy coax, funny thing, the antenna is declared 3dB gain and it comes with the 2.5m of RF-174 cable.
If you look the specs. this cable has the loss of 1dB per mtrs, so all the gain is trashed just to this peace of pigtail...

You better cut this coax to 10cm and continue with some Wi-Fi grade coaxial cable if nothing better.

Adam

[shakysen]

Well Adam. They work for me, I'm pleased with them Not bad in my opinion for indoor antenna

                                                           Shaky