Hello,
I’ve been using SXT 5HnD and I had no complains up to now.
However, in the need for a detailed tests to publish for a scientific paper, I need to artificially report packet drop rate in my specific application (low latency UDP audio tx) depending on the SNR.
The best way to achieve this IMO is to select a specific data rate (among the 802.11A/G ones) and stick to it, while lowering the Tx Power (all rates fixed), thus obtaining decreasing SNR.
Unfortunately, up to now I can’t get the SXT to lock to the data rate I specify!! Maybe there is something wrong in my config. What I do: set a basic data rate (6Mbps) and a Supported data rate (6, 36Mbps) for both the ends (a station bridge and a bridge). What happens:
- with very high Tx power the station bridge webFig reports a very high link SNR (117dB, the antennas are in my office), and the Tx data rate keeps at 36mbps almost always, (Rx totally out: 104mbps usually)
- when I decrease the Tx power at both ends the SNR drops sligthly and the station bridge reports Tx/Rx data rates changing every possible data rate (generally >36, e.g. 52, 78, 104, 117, etc) while transmitting.
If I use the default rates, the SXT tries to adjust to optimize SNR and CCQ, employing the 802.11A/G data rates, which is not what I want (because I can’t conduct serious measures and because audio packets are sometimes lost when the data rate changes).
I can recap my config at both ends, see attached pdfs. These are the wireless webfig prints from the station bridge and the bridge. I monitor on link info (rate, CCQ, etc.) on the station bridge page
parametri-prova0-a-192.168.24.42-bridge.pdf (208 KB)
parametri-prova0-a-192.168.24.24-statiobridge.pdf (231 KB)