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Opened 7 years ago

Closed 6 years ago

Last modified 4 years ago

#9326 closed defect (invalid)

Nanostation m - Antenne array not defined?

Reported by: josef.semler@… Owned by: developers
Priority: normal Milestone: Barrier Breaker 14.07
Component: base system Version: Trunk
Keywords: Cc:

Description

Playin' around with nanostation m series we found out, that there is no possibility in Backfire to modify the antenna-direction.
Postings in some newsgroups taught me, that "all antennas are active"
Read sonething that "array is hardcoded to 1x1 in ath9k main.c" for that purpouse.
Do we have some chance to add this feature?

JoeSemler, 0xFF-Vienna

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Change History (4)

comment:1 follow-up: Changed 7 years ago by nbd

  • Resolution set to invalid
  • Status changed from new to closed

It does not make sense to modify the antenna direction, as both antennas are active at the same time for both rx and tx. There is no antenna array hardcoding, nor does it make any sense to add something there.

comment:2 in reply to: ↑ 1 Changed 6 years ago by anonymous

  • Resolution invalid deleted
  • Status changed from closed to reopened

Replying to nbd:

It does not make sense to modify the antenna direction, as both antennas are active at the same time for both rx and tx. There is no antenna array hardcoding, nor does it make any sense to add something there.

It does make sense, as the hardware has the capability to set antenna polarity (horizontal and vertical). This was controllable in the atheros platform. Having lost this capability in the M series is a significant loss of functionality.

comment:3 Changed 6 years ago by nbd

  • Resolution set to invalid
  • Status changed from reopened to closed

The only reason why it made sense to set the antenna polarity on the older Nanostation devices was because the radio only had one physical receive/transmit path, connected to an antenna switch that could choose between the two antennas.

With the newer Nanostation M hardware, there are also two internal antennas, one with horizontal polarization, one with vertial polarization. But here, each antenna is connected to its own radio transmit/receive path, which is used for MIMO.

I really don't see why you'd want to disable one of those transmit/receive paths, as this would really only make the link worse, not better.

comment:4 Changed 4 years ago by jow

  • Milestone changed from Attitude Adjustment 12.09 to Barrier Breaker 14.07

Milestone Attitude Adjustment 12.09 deleted

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