Zcomax 200mw Card And Tx-Power
Dave.Edwards at abicom-international.com
Mon Dec 9 12:32:49 EST 2002
HP 25GHz (HP8193 I think) or Anritsu.
They are not cheap! A 2.5GHz one will cost in excess of £10K. If it's
an issue you could hire one, they tend to be around £500/week (somebody
correct me if I'm wrong).
Another way of checking would be to see what receive sensitivity you can
get with a second link on another channel (try 1 & 7). To do this you
will need a decent variable attenuator (again not cheap) and some RF
pads. To do the test, measure the rx sensitivity by increasing the
attenuation until this link stops working (don't forget about shielding)
then repeat the test with the second link running at full power.
You will see that the sensitivity is around 80dBm at 11Mbit and higher
at lower data rates. If the tx is splattering this will reduce to around
40dBm or worse. Additionally the rx sensitivity on the high power link
may also drop due to distortion in the amplifier.
Hope this helps
Michael Shuler wrote:
>Don't have one but would love to, can you recommend a brand/model? Any
>idea how much it should cost? Do you have a card that you recommend?
>From: Dave Edwards [mailto:Dave.Edwards at abicom-international.com]
>Sent: Monday, December 09, 2002 11:17 AM
>To: Christian Zoffoli
>Cc: Michael Shuler; hostap at shmoo.com
>Subject: Re: Zcomax 200mw Card And Tx-Power
>Have you checked the output on a spectrum analyser? We have found that
>the higher output on some radios can effectively splatter across the
>whole 83MHz band, rendering it useless. Also this will "noise" can
>reduce the range of the device significantly.
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