Check if the antennae are both working

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Check if the antennae are both working

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
Check if the antennae are both working
Check if the antennae are both working
2020-07-18 13:27:52
Model: Archer MR600  
Hardware Version: V1
Firmware Version: 1.1.0 0.9.1 v0001.0 Build 200417 Rel.75138n

Is there a way to check if it is using both antennae and how well each one is doing ?

If I disconnect the left hand one as you look at the back of the unit it seems to make no difference to the signal strengths. If I disconnect the right hand one the signal drops to zero.

So basically:

No aerials = no signal

left aerial only = no signal

right aerial only = 50% signal

both aerials = 50% signal

 

I read a post that said one of the antenna is the main one and must always be connected so I guess this is the right hand one. But it seems the left one doesn't "add anything to the party". Is there a way to check ?

 

It's connecting 4G LTE+ to Vodafone in the UK

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#1
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4 Reply
Re:Check if the antennae are both working
2020-07-18 16:35:21 - last edited 2020-07-18 16:37:00

If you disconnect or severely limit the signal at one aerial it will eventually switch to the other - putting a can over it or flipping it 90deg is often good enough. What I haven't seen is any convincing evidence it's ever using both simultaneously or spontaneously switching other than dealing with a terrible signal. As a diversity aerial it seems to just scrape the minimum definition as an alternate option after catastrophic signal failure.

 

There seems to be no way to directly check them, maybe because it's only using 1 at a time?

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#2
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Re:Check if the antennae are both working
2020-07-19 09:08:14

At least for transmitting it is only using one antenna in my case, even if both are attached (confirmed with spectrum analyzer and h-field probe).

When both antennas are connected, the MR600 shows 4G+ with bands 3,20.

When only one antenna is connected, the MR600 shows 4G with only band 20 (slow), and one port being much worse than the other.

 

I'm using a cross-polarized log-periodic antenna.

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#3
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Re:Check if the antennae are both working
2020-07-19 12:18:45

@Baenz makes sense being able to use both antenna for 4G+, especially between bands as far apart as 3&20, each one will have different progagation properties and the built in antenna very different reception due to spacing. B20 signal strength is unusable here, with any of the antenna I've tried (though my old Huawei could see it on internal antenna,just). Bit peculiar if an external antenna changes reception Q just by switching socket though.

 

I could simply be getting such different Q from each antenna the poorer one just can't help, still think they've cheaped out on diversity though.

 

[and now I think I'll have another play with cross polarisation again, nothing better to do ;)]

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#4
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Re:Check if the antennae are both working
2020-07-19 14:24:21

Situation here is B20 is strong but slow (-80 dBm, 5 Mbit/s), B3 weak but fast (-101 dBm, 75 Mbit/s).

But with a single antenna it doesn't make use of band 3 at all and always choses B20.

 

 

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#5
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