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el berto
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Posts: 213
Joined: Wed Sep 26, 2007 10:53 am

Ageing wireless cards?

Thu Nov 26, 2020 12:33 pm

Hi to all users!
I got several links not working during all years I've been using Mikrotik devices, to avoid to waste time searching for trouble, I directly replaced both devices on PtP links.
Early radios I bought were using CM9 wireless cards.
I have several CM9 old boards I'm testing.
I got new (still unused) CM9 pair (for AP and client), 5GHz-A, 10MHz bandwidth, 2.4GHz panel antenna (to simulate path loss), test made in a cave (to avoid other RF signals).
Card power 15dB, data rate fixed to 6M, CCQ average value on 60 seconds, sample taken every second.
AP = RB433 with new CM9 wireless card
client = RB433 with new and old CM9 wireless cards
Frequency [MHz]	CCQ [%] new CM9	CCQ [%] CM9 under test
5495			100		100
5500			100		76
5505			100		73
5510			100		95
5515			100		81
5520			100		68
5525			100		82
5530			95		71
5535			100		93
5540			95		82
5545			100		71
5550			100		95
5555			95		80
5560			100		70
5565			100		81
5570			100		95
5575			100		74
5580			100		71
5585			100		85
5590			100		85
5595			100		85
5600			100		82
5605			100		93
5610			100		82
5615			100		82
5620			100		71
5625			100		95
5630			100		95
5635			100		76
5640			100		77
5645			100		71
5650			100		95
5655			100		68
5660			100		85
5665			100		67
5670			100		73
5675			100		75
5680			100		82
5685			100		82
5690			100		78
5695			100		79
5700			100		78
5705			100		79
I made test twice, I also changed RouterBoard (RB433), I got same results: old CM9 boards are worse than new ones.
Any idea? CM9 really damaged (maybe lightnings) or simply hardware ageing?
Thanks.
 
mada3k
Member
Member
Posts: 306
Joined: Mon Jul 13, 2015 10:53 am
Location: Sweden

Re: Ageing wireless cards?

Fri Nov 27, 2020 6:01 pm

From my experience - Yes, radio-hardware does degrade with age.

I have no proof to back it up.
Manages some CCR's, RB750Gr3, RB922 and wAP's
 
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ahteran
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Posts: 39
Joined: Sun Nov 09, 2014 5:07 pm

Re: Ageing wireless cards?

Sun Nov 29, 2020 6:15 pm

Change CM9 card

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