Spare wifi card antenna

[Robert Holland]

My roommate's got a wifi card in his desktop with a broken-off antenna.
Anyone have a spare we could buy, or know where to get them in town? We
don't want to buy a whole new card if we can avoid it.

The card is a D-Link; I'll provide more info later when I can get into
the case and take a peek at it. The antenna interface doesn't match the
ones on my Linksys WRT54GL router; I don't know how many different
standards there are.

--Robert

[Derek Eggers]

Robert,

If this one works you're welcome to have it.  

-Derek

--Robert

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Derek Eggers

[Robert Holland]

That looks like the right kind--I'll give it a try, thanks! I'll see if I can come by on Wednesday.

--Robert

On 1/30/12 8:29 PM, Derek Eggers wrote:

Robert,

If this one works you're welcome to have it.  

-Derek

On Mon, Jan 30, 2012 at 8:05 PM, Robert Holland <roberth...@gmail.com> wrote:

My roommate's got a wifi card in his desktop with a broken-off antenna. Anyone have a spare we could buy, or know where to get them in town? We don't want to buy a whole new card if we can avoid it.

The card is a D-Link; I'll provide more info later when I can get into the case and take a peek at it. The antenna interface doesn't match the ones on my Linksys WRT54GL router; I don't know how many different standards there are.

--Robert

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Derek Eggers

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[Derek Eggers]

Great.  I'll try to leave it somewhere in the space for you.

[Dave]

--- On Mon, 1/30/12, Robert Holland <roberth...@gmail.com> wrote:

The standard interface connector for those antennas is called a
RP-SMA (Reverse Polarity SMA):

http://en.wikipedia.org/wiki/RP-SMA#Reverse_polarity_SMA

Of course, that's never stopped manufacturers from following the
"If we don't like the standard, we'll make our own!" philosophy.

> --Robert

Dave

[timk]

It's worse than that; the FCC mandates that antenna connectors be
unique and not readily available to the general public. Code of
Federal Regulations, Title 47, Part 15.203 (telecommunication -> radio
frequency devices -> intentional radiators):

"An intentional radiator shall be designed to ensure that no antenna
other than that furnished by the responsible party shall be used with
the device. The use of a permanently attached antenna or of an antenna
that uses a unique coupling to the intentional radiator shall be
considered sufficient to comply with the provisions of this section.
The manufacturer may design the unit so that a broken antenna can be
replaced by the user, but the use of a standard antenna jack or
electrical connector is prohibited."
-
http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=0a0d50f36acfe0d707a15ed3cecd2960&rgn=div8&view=text&node=47:1.0.1.1.16.3.240.3&idno=47

Other parts of the code seem to point to 6dBi directional antennas
being the limit at which you have to start reducing transmit power.
Here's Cisco's analysis of a change in 2007, for which I can't find a
source:

"While the requirement for unique connectors remains, the regulations
for certification of antennas have changed with the rules introduced
in October 2004. These regulations permit any user to install any
antenna that is of the same family or style, and equal or lower gain,
than any certified antenna. For example: if a 10-dBi patch antenna is
certified for use with a specific WLAN transmitter, any patch antenna
with a gain of 10 dBi or less may also be used, regardless of its
manufacturer. Or if a Yagi directional antenna with a gain of 13.5 dBi
is certified with a transmitter, any Yagi antenna with 13.5 or less
gain may be used with that transmitter."
- https://www.cisco.com/en/US/prod/collateral/wireless/ps5679/ps5861/prod_white_paper0900aecd801c4a88_ps469_Products_White_Paper.html

Anyway, the point is that even in the absence of NIH syndrome,
manufacturers had a legal incentive to use awkward connectors or hard-
mount their antennas.

-Tim

[Derek Eggers]

Hi Robert,

I stopped by collexion earlier.  Couldn't get in so I left the antenna in the little mailbox to the left of the door.  Hope it works for you.

Derek 

[timk]

Last night? Must've just missed me, I got there at about 7. Robert
came by, and I thought he asked me about the mailbox. He didn't see it
outside. I didn't check.

-Tim

On Feb 1, 7:42 pm, Derek Eggers <eggers.de...@gmail.com> wrote:
> Hi Robert,
> I stopped by collexion earlier.  Couldn't get in so I left the antenna in the little mailbox to the left of the door.  Hope it works for you.
>
> Derek
>

> On Jan 30, 2012, at 10:08 PM, Robert Holland <robertholla...@gmail.com> wrote:
>
>
>
>
>
>
>
> > That looks like the right kind--I'll give it a try, thanks! I'll see if I can come by on Wednesday.
>
> > --Robert
>
> > On 1/30/12 8:29 PM, Derek Eggers wrote:
>
> >> Robert,
> >> If this one works you're welcome to have it.
> >> -Derek
>

> >> On Mon, Jan 30, 2012 at 8:05 PM, Robert Holland <robertholla...@gmail.com> wrote:
> >> My roommate's got a wifi card in his desktop with a broken-off antenna. Anyone have a spare we could buy, or know where to get them in town? We don't want to buy a whole new card if we can avoid it.
>
> >> The card is a D-Link; I'll provide more info later when I can get into the case and take a peek at it. The antenna interface doesn't match the ones on my Linksys WRT54GL router; I don't know how many different standards there are.
>
> >> --Robert
>
> >> --
> >> You received this message because you are subscribed to the Google Groups "Collexion" group.
> >> To post to this group, send email to coll...@googlegroups.com.
> >> To unsubscribe from this group, send email to collexion+...@googlegroups.com.

> >> For more options, visit this group athttp://groups.google.com/group/collexion?hl=en.

>
> >> --
> >> Derek Eggers
>
> >> --
> >> You received this message because you are subscribed to the Google Groups "Collexion" group.
> >> To post to this group, send email to coll...@googlegroups.com.
> >> To unsubscribe from this group, send email to collexion+...@googlegroups.com.

> >> For more options, visit this group athttp://groups.google.com/group/collexion?hl=en.

[Derek Eggers]

Shoot! Was it not there? Little small black box to the lower left of the door.

Derek Eggers, Ed.D.
Director of Online Education
College of Arts and Sciences
University of Kentucky
www.as.uky.edu
(859)312-8789

[Robert Holland]

(How did I miss this message? I dunno.)

I may have been looking in the wrong place for the mailbox. I'll try to
take a look soon. Can someone verify that the antenna is still there?

--Robert Holland