MR600 V2 & 4G/+ Antenna Information (LPDA MIMO) AU - John VK3HJQ

MR600 V2 & 4G/+ Antenna Information (LPDA MIMO) AU - John VK3HJQ
MR600 V2 & 4G/+ Antenna Information (LPDA MIMO) AU - John VK3HJQ
2021-08-04 14:28:24 - last edited Yesterday
Hardware Version: V2
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MR600 V2 & 4G/+ Antenna Information (LPDA MIMO) AU - John vk3hjq



Portable speed & range tests 

Queensland Australia

(A little Queensland test drive - 13,000km [8077 miles]) 


TP-Link Archer MR600 V2 (Cat 6) 12Volt Solar powered.

Maximum speed achieved with 2 x LPDA (10-11dBi) Antennas was 140Mbps/40Mbps (2X2 MIMO 4G+) @ *8km's from the cell tower, compared to 1 x magnetic mount 7dBi antenna on the roof @ 40Mbps/20Mbps (MISO/SISO). 

Solar panel 30V @ 8.3A / Battery 13.7V @ 16.8A


Test @ a No Signal location

**10.8km from the closer cell tower with Mountains in between, in a NO Signal area according to the phone app, but the Signal still got through, even though is was a bit slow. (13.0Mbps/1.47Mbps @ 52ms MISO/SISO).



Click here to download (4.4Mb 17sec Vid)

Full Video here.....(1:03)




Antennas laying down on the roof, not far from the cell tower/s, great reception (4G+ 2X2 MIMO Full Signal).




Higher gain in dBi, equates to longer length of the LPDA Antenna. 



Tech Info


NOTE: The LPDA Antenna is feed from the front, meaning the coax is connected to the front of the Antenna & not the back.






MISO/SISO Connection

1 external LPDA Antenna


Never EVER use these types of 2 way splitters to connect 1 Antenna to the 2 Antennas ports (Main / Aux).


Always have 2 Antennas connected, it will NOT work with ONLY the AUX Antenna connected, (unless a very high signal is present) but it will work with the Main Antenna connected.

NOTE: (Never leave the Antenna input open circuit with no 50ohm load connected, meaning always have both Antennas connected even if ONLY using 1 external LPDA Antenna)



1 Antenna (LPDA) Main (-45 Deg/135 Deg) connected to the Main Antenna Input for 1X1 SISO/2X1 MISO operation. (MUST have internal Antenna still connected to AUX)




2X2 MIMO Connection

2 external LPDA Antennas


2 Antennas (LPDA) Main & AUX, AUX @ 45 Deg & Main @ 135 Deg (-45 Deg) then connect to the (Main & AUX) Antenna inputs respectively. 




Good, Better & Best way to mount LPDA Antennas




You can mount the LPDA MIMO Antennas vertically on either the Right or Left (Left preferred) side of the mast/pole, always make sure the arrow/s on the LPDA Antenna/s is pointing up & the Antennas should be mounted a minimum of 42.8cm (1 wavelength @ 700MHz) apart & for Optimum performance, mount them 85.6cm (2 wavelengths @ 700MHz) apart.

You can also mount them the other way around if you require a better Main signal, (because of the Antenna spacing required) but this could drop your 2X2 MIMO signal out too & go back to 1X1 MISO/SISO operation, this means now having the Main @ the Top & AUX @ the Bottom/Underneath.


For the BEST performance, a better solution would be to mount them horizontally instead to allow for the Optimum spacing required @ 700MHz (lowest frequency used) of 85.6cm apart. (both LPDA Antennas MUST still be pointing up   @ the correct angle)



Some other LPDA Horizontal mounts

Not sure how far this bracket would space the Antennas apart, but @ a guess somewhere around 21.8cm by the looks.










Less loss if you DONT need to use Patch Leads to the Modem/Router, sometimes it is necessary to do this for cable conversion & to stop your Modem/Router being pulled off the Bench/Table & it also makes it a lot easier to connect the heavy coax (LMR400) into your Modem/Router as well.

Adaptor can add >1 -1.5dB of loss, Remember 3dB is 1/2 your signal lost.


12dBi (9.85dBd / 9.85dB) & usually less gain @ the lower frequencies, down by a further >1dBi



What's inside LPDA Antennas.





Other types of LPDA Antennas, 2 are required for 2X2 MIMO operation.

8 -12dBi (694 - 3800MHz) @ 5G (3600MHz) 3dBi

For the Best performance, antennas should be mounted at least 1 wavelength apart @ the lowest operating Frequency, as detailed previously.


Dish (Parabolic) High Gain Antennas

Always check the frequency range on Dish (Parabolic) Antenna feed horns (1700 - 3800MHz, 2 x 30dBi & 1700 - 2700MHz, 2 x 24dBi) Remember 4G/+ 700 - 2700MHz & 5G 3800MHz AU


1 Dish with 2 coax feed ins. (Vert/Horiz)


or 2 Dishes, each with 1 coax feed in, the better option.


Always cable tie the coax cables to the mast & seal the connectors as previously described.

Note the antenna angles (+ - 45deg) for 2X2 MIMO operation & the antenna spacing still applies here too.


Need to use low loss coax like LMR400, not RG58 of similiar used here by the looks, this is because of the huge losses in this type of coax cable, it defeats the purpose of using High Gain Antennas in the 1st place, @ 100 feet (30.48mtrs) of coax, its 16.5dB (RG58) loss compared to 3.9dB (LMR400) @ an operating frequency of 900MHz.


Something different, a LPDA Antenna with a Reflector fitted.


Gain increase is 1 dBi by the looks of it with the Reflector added (Grid @ the back)





A MUST is to have a 90 Volt Lightning Surge Arrestor fitted to each coax cable & connected to a Ground Earth Rod.


Whats inside these Lightning Surge Arrestors, which provides protection for your 4G/+ Modem/Router. (Both conductors are protected in this type).

So how it works is that any surge voltage over 90 volts (72 -108V) on the centre conductor causes the GDT to conduct this surge voltage to ground/earth, while the Shield/Braid conductor is always grounded to earth. You MUST have an adequate earthing system connected, this usually takes the form of a ground/earth rod/stake with appropriately sized earth wire/cable.




Static build up could be a problem too when using these GDT.




A minimum of 4mm squared (4mm2) Earth wire should be used for grounding (AU)


VK3HJQ 2021




Auto LPDA Antennas.mp4Download
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2021-08-17 08:49:55