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mistry7
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CAP ac bad Antenna design?

Fri Feb 09, 2018 6:39 pm

Hi,

today i get the first CAP ac´s from Distribution.
I Start to test.... swap WAP ac to CAP ac,
same destination, same distance , same position of Macbook.
WAP ac:
866 Mbit Brutto Shows -72db
CAP ac:
655 MBit Brutto Shows -84db
Real throughput on CAP ac i did not see more than 30 Mbit
Thats what Mikrotik delivers with Wave 2?
Tested with ROS 6.41.2
mistry7
 
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cdiedrich
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Re: CAP ac bad Antenna design?

Fri Feb 09, 2018 7:00 pm

wAP ac has 3 chains, cAP ac has two.
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mistry7
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Re: CAP ac bad Antenna design?

Fri Feb 09, 2018 9:20 pm

wAP ac has 3 chains, cAP ac has two.
-Chris
866 MBit is 80 MHz, with 2 Streams

3 chains @80Mhz is 1300MBit
 
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AlainCasault
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Re: CAP ac bad Antenna design?

Fri Feb 09, 2018 10:01 pm

At any rate I doubt the macbook has three chains.

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aidan
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Re: CAP ac bad Antenna design?

Sat Feb 10, 2018 9:39 pm

Are you able to test a hAP ac2 as well?
 
mistry7
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Re: CAP ac bad Antenna design?

Sun Feb 11, 2018 2:14 pm

I will get the first one in the next week
 
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normis
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Re: CAP ac bad Antenna design?

Mon Feb 12, 2018 10:39 am

Macbooks do have Three chains, btw.
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aidan
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Re: CAP ac bad Antenna design?

Mon Feb 12, 2018 3:42 pm

Macbooks do have Three chains, btw.
That depends on the model of MacBook. In this case it probably only supports two chains since it operated at 866 Mbps with the wAP AC. If it had three chains it would have instead negotiated 1.3 Gbps or maybe 877 Mbps with lesser signal strength.

But the point of the original post is that the cAP AC appears to have an inferior antenna design. I hope that other units (or even the hAP ac2) do not exhibit this issue, otherwise we'll have to wait for an IPQ-4018 wAP AC.
 
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normis
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Re: CAP ac bad Antenna design?

Mon Feb 12, 2018 3:45 pm

The new hAPac^2 and cAPac have two chains, since most devices only have 2 chains and the third chain is rarely used.
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Re: CAP ac bad Antenna design?

Mon Feb 12, 2018 4:38 pm

The new hAPac^2 and cAPac have two chains, since most devices only have 2 chains and the third chain is rarely used.
What about load balancing between chains?What if i have 20 + various devices which have mix of 1 or 2 chains, arent all 3 chains on Mikrotik device used and give better overall throughput?
 
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Re: CAP ac bad Antenna design?

Mon Feb 12, 2018 4:50 pm

Wave 2 is supposed to do that. But after some research, I learned that this is easier said than done. MU-MIMO is better with static clients, not so good with moving ones.


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R1CH
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Re: CAP ac bad Antenna design?

Mon Feb 12, 2018 6:14 pm

Even with reduction in chain count, this shouldn't affect signal strength. The difference between -72 and -84 is quite large. Is the TX power the same? Can you test without any of the cases on?
 
mistry7
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Re: CAP ac bad Antenna design?

Mon Feb 12, 2018 7:24 pm

I will try it without case tomorrow
But I think I could be a wireless driver problem, I see really bad reported signal on Lhg ac, but it modulates with high rates, i will investigate this
 
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normis
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Re: CAP ac bad Antenna design?

Tue Feb 13, 2018 12:38 pm

wAP and cAP is not a fair comparison, wAP is a waterproof device, designed to also be used outdoors. It has a different antenna design.
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doneware
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Re: CAP ac bad Antenna design?

Tue Feb 13, 2018 6:17 pm

At any rate I doubt the macbook has three chains.
macbook pro models have. mb air is "just" 2chain.
https://www.custompcreview.com/reviews/ ... ifference/
#TR0359
 
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Re: CAP ac bad Antenna design?

Wed Feb 14, 2018 1:35 am

wAP and cAP is not a fair comparison, wAP is a waterproof device, designed to also be used outdoors. It has a different antenna design.
Why not design all access points (whether wAP, cAP, or hAP) with similar antenna? There are advantages to having an improved antenna for indoor access points, such as lower access point density or improved client reception. And if the wAP has the best antenna, and the brochure indicates that it can be mounted indoors or outdoors, why not have it be the only access point?
 
R1CH
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Re: CAP ac bad Antenna design?

Wed Feb 14, 2018 12:18 pm

wAP and cAP is not a fair comparison, wAP is a waterproof device, designed to also be used outdoors. It has a different antenna design.
Are there antenna patterns for the devices anywhere so we can see how best to utilize their antenna designs? 10dB difference between products is massive, especially when they are both listed as having 2dB antennas.
 
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Re: CAP ac bad Antenna design?

Sat Feb 17, 2018 6:23 am

im actually very keen on purchasing cap ac........ but mikrotik needs to test this antenna complaint.

in fact, i questioned them about this in my email conversation and they claim that caps ac antenna should be better than wap ac if anything.

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