Re: Any suggestions for programmable attenuators?

[Ben Greear <greearb@candelatech.com>]

On 07/26/2012 10:29 AM, Paul Stewart wrote:
> We have a few units from eubus (http://www.eubus.net, ATS0760-95).
> They're fairly easy to interface to (we're controlling them with a
> BeagleBone, but need level shifting because they are 5V devices).  We
> don't have a whole lot of seat time with them so far, but we've
> validated that they work.

I've managed to wire up some of these as well (using Arduino as controller).

One thing I notice is that the smallest signal quality I can see
reported by the NIC (ath9k) is about -81 or -82 dBm.

Technically, the attenuator should be able to go below the
noise floor of around -90dbm if I understand things properly.

Have you done any testing of this nature?

And for what it's worth, using ath9k, 1x1 MIMO (one channel) /n, ht40 on 5ghz,
I get almost 8Mbps UDP download at -80 dBm signal quality :)

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com