qi-hardware/ben-wpan
1
0
Fork 0
mirror of git://projects.qi-hardware.com/ben-wpan.git synced 2024-11-25 21:00:37 +02:00
Code

usrp/README: clarified distance between antennas and fixed typos in examples

Browse Source
This commit is contained in:
Werner Almesberger 2010-11-17 13:22:01 -03:00
parent 3684c0765a
commit b7ad7f2a31
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
usrp/README
View File

@ -25,9 +25,9 @@ contamination from other sources.
(The same setup may also work with a USRP1 or UN210, and a RFX2400
board.)
Both should be spaced at least twenty times the wavelength, or 2.5 m
apart. For test runs that can be compared with each other, antenna
placement and orientation have to be exactly the same.
Both should be spaced at least twenty times the wavelength (12.5 cm at
2405 MHz), or 2.5 m apart. For test runs that can be compared with each
other, antenna placement and orientation have to be exactly the same.
The sender runs tools/atrf-txrx/atrf-txrx, the receiver runs utilities
from gnuradio.
@ -129,7 +129,7 @@ contamination from other sources.
7) Obtain the peaks from all measurements
gnuplot> plot "<for n in 100/tmp*; do ./fft -s 100 5 15 50 <$n;done" \
gnuplot> plot "<for n in 100/tmp*; do ./fft -s 100 0 20 50 <$n;done" \
with lines
^ ^ ^ ^
| | | |
@ -142,7 +142,7 @@ contamination from other sources.
8) The final result for one measurement run can be obtained as follows:
for n in 100/tmp*; do ./fft -s 100 0 200 50 <$n;done | ./range -v 2
for n in 100/tmp*; do ./fft -s 100 0 20 50 <$n;done | ./range -v 2
In this example, "range" eliminates all outliers more than 2 dB from
the average and reports this.