Service manual

WLAN TX Measurements

R&S

FSV-K91/91n/91ac/91p

42Operating Manual 1176.7649.02 ─ 04

Fig. 3-9: Mixed mode 20MHz signal with "Channel BW to measure" set to measure only 40MHz sig-

nals

Messages and warnings

The following messages are generated by the R&S FSV-K91 measurement applica-

tion:

Results contribute to overall results despite inconsistencies:

"Info: Comparison between HT-SIG Payload Length and Estimated Payload

Length not performed due to insufficient SNR"

The R&S FSV-K91 application compares the HT-SIG length against the length estima-

ted from the PPDU power profile. If the two values do not match, the corresponding

entry is highlighted orange. If the signal quality is very bad, this comparison is sup-

pressed and the message above is shown.

"Warning: HT-SIG of PPDU was not evaluated"

Decoding of the HT-SIG was not possible because there was to not enough data in the

Capture Memory (potential burst truncation).

"Warning: Mismatch between HT-SIG and estimated (SNR+Power) PPDU length"

The HT-SIG length and the length estimated by the R&S FSV application (from the

PPDU power profile) are different.

"Warning: Physical Channel estimation impossible / Phy Chan results not availa-

ble Possible reasons: channel matrix not square or singular to working preci-

sion"

Signal Field Measurement (IEEE 802.11ac, n (SISO+MIMO))