HowToBuild: AERO/STD-C inmarsat "L-band 1542 MHz panel antenna"

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hamradionl
Posts: 18
Joined: Fri Nov 22, 2019 12:42 pm

HowToBuild: AERO/STD-C inmarsat "L-band 1542 MHz panel antenna"

Post by hamradionl » Sun Feb 09, 2020 12:15 pm

"L-band Panel Antenna"

Material
- Simple patch driven element PCB board thickness 1.6 mm
- Patch driven element copper or brass thickness 2.0 - 5.0 mm thickness give more bandwidth
- Teflon spacer 2.0 - 5.0 mm
- Teflon rings to fill up space distance to 7.0 mm

Mounting instructions
Mount 93 x 93 (94 x 94) L-band patch 7mm from the bottom in hammond diecast metal box and using the inner metal bottom as a 175 x 175 mm reflector.
Patch driven element is made from Single sided PCB board thickness 1.6mm + Teflon spacer 5.0 mm + 2x teflon rings = 7.0 mm. Use PCB board thickness 1.6 mm, measuring 7.0 mm between box bottom to TOP PCB copper layer.
When use 1.0 mm - 5.0 mm copper or brass plate, measuring 7.0 mm between box bottom and directly underside. (not top)
To cover the front on the metal box, i use a plastic case cover from IKEA.
The hammond diecast metal box with the patch directly mounted on the bottom, the 4x side panels acting as "sort of horn antenna" this give little directional to the front. Using a long size SMA to pass true inside to the back in to IP64 ABS box. The ABS box are RTLSDR + Nooelec IO LNA + bandpass filter and RTLSDR is connected to USB cable going to PC. (some extra space created for the USB over CAT6 extender cable to get 30 meters extension)

Driven element
98 x 98 = 1495 MHz / SMA connector 25 mm
94 x 94 = 1525 MHz / SMA connector 24 mm
93 x 93 = 1535 MHz / SMA connector 24 mm
85 x 85 = 1542 MHz / SMA connector 24 mm

Practical testing
Live in city area surrounded by houses and buildings have no free view to inmarsat.
Inside home while standing in the middle of room, 1.6 meters in front and pointing toward a small window, received both inmarsat atlantic and Indie ocean, SDR# tuned on 10500 BPS signal, this show SNR +/- 18. Tested while turning the box clockwise or counter clockwise, this give some SNR improvement.
Any other antenna i tested inside the home and in room, was not able to receive any signal at all !

To do list
- Search or make a mast clamp for mounting "L-band panel antenna" and give it little degrees elevation, angle
- Search for low-cost metal box.

Next test
this antenna in front of dish.

When all is working, think of make a ready DIY kit with all components to build "L-band panel antenna".
Hammond metal are expensive cases, zo not be lowcost solution.


Wish you all
happy building and good receiving.

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Attachments
L-BAND_PATCH_IN_BOX.jpg
PCB or Folie patch antenna
L-BAND_PATCH_IN_BOX.jpg (50.58 KiB) Viewed 8673 times
L-BAND_PATCH_IN_BOX_FRONT.jpg
Nooelec IO LNA + RTLSDR
L-BAND_PATCH_IN_BOX_FRONT.jpg (45.77 KiB) Viewed 8673 times
L-BAND_PATCH_IN_BOX_CLOSED.jpg
Closed using rubber seal + IKEA cover
L-BAND_PATCH_IN_BOX_CLOSED.jpg (11.24 KiB) Viewed 8673 times

hamradionl
Posts: 18
Joined: Fri Nov 22, 2019 12:42 pm

HowToBuild: AERO/STD-C inmarsat "L-band 1542 MHz panel antenna"

Post by hamradionl » Mon Mar 09, 2020 12:37 am

AERO/STD-C re-building the othernet 3 element L-band 1542MHz Patch antenna.

Material
Using 3x laser cut 0.8mm Brass plates.
The antenna ground back plate 120 x 120 is mounted inside 175 x 175 x 60 mm metal box, this give a extra directional gain to the front.
The brass centre bold + nut, is for LNA static protection and same time used to centre mount the antenna in the metal box.

LNA
Nooelec SAWbird+ iO - Premium SAW Filter & Cascaded Ultra-Low Noise

Test antenna
Live in city area surrounded by houses and buildings have no free view to inmarsat.
Reception inside the house, receiving both Inmarsat ZZW atlantic + Alphasat ZZE indie ocean and signals are strong and surprisingly good.

Todo list
- Weather get more clear or dry, antenna mounted beside the 65 cm dish antenna, to see if there is any difference.
- Mount this antenna inside a bigger metal box size: 250 x 250 x 100 mm.
- Experimenting with extra 3 or 4 directional plates.


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Attachments
OTHERNET_DIY_KIT.png
OTHERNET_DIY_KIT.png (1.19 MiB) Viewed 7881 times
OTERNET_PATCH_DIY_2.jpg
OTERNET_PATCH_DIY_2.jpg (31 KiB) Viewed 7881 times
OTERNET_PATCH_DIY_1.jpg
OTERNET_PATCH_DIY_1.jpg (134.97 KiB) Viewed 7881 times

Username
Posts: 599
Joined: Sun Oct 09, 2016 7:27 am

Re: HowToBuild: AERO/STD-C inmarsat "L-band 1542 MHz panel antenna"

Post by Username » Mon Mar 30, 2020 3:28 pm

Its the original Outernet Design. :roll:
I have the orignal at Home and the dont work for me.

hamradionl
Posts: 18
Joined: Fri Nov 22, 2019 12:42 pm

Re: HowToBuild: AERO/STD-C inmarsat "L-band 1542 MHz panel antenna"

Post by hamradionl » Tue Mar 31, 2020 10:40 pm

Your are absolutely and fully correct,
like i write in the description : re-building the othernet 3 element.

Build 3x patch antennas with 2x plates and 2x patch antennas using 3x plates,
tested the 2 plate and 3 plates beside using a LNA 35dB, all work fine inside the house.
All these patches are mounted inside a metal box as extra reflector
If the antennas not worked for me, i had no reason to share this information :)

BTW: you be aware othernet made 2 versions

hamradionl
Posts: 18
Joined: Fri Nov 22, 2019 12:42 pm

Re: HowToBuild: AERO/STD-C inmarsat "L-band 1542 MHz panel antenna"

Post by hamradionl » Sun May 24, 2020 5:46 pm

Moved this patch antenna in the metal box from 3 meters ground level in to a tower mast 8 meters above the surrounding houses and use a antenna rotator for directional. This seem to improve the SNR and the lower level signals.
ALPHASAT for North Europe is located equator SSE above Indy ocean and i noticed, the antenna set some 10 degrees upwards for best SNR (funny ???). The Horizontal direction is more critical while the vertical angle seem less critical.

hamradionl
Posts: 18
Joined: Fri Nov 22, 2019 12:42 pm

Re: HowToBuild: AERO/STD-C inmarsat "L-band 1542 MHz panel antenna"

Post by hamradionl » Wed May 27, 2020 4:46 pm

After week did more testing on new high location.
Using the antenna rotor, point the patch antenna to SSW atlantic ocean, give also high quality signal SNR from inmarsat 5F2 and possible to point antenna to SE inmarsat 5F4, 5F1.

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