On 03/06/13 18:36, Jean Delvare wrote:
Hi all,
I have a TerraTec Cinergy T PCIe Dual card, with DRX-3916K and
DRX-3913K frontends. I am thus using the drxk dvb-frontend driver.
While trying to find the best antenna, position and amplification, I
found that the statistics returned by the drxk driver look quite bad:
$ femon -H 3
FE: DRXK DVB-T (DVBT)
status SCVYL | signal 0% | snr 0% | ber 0 | unc 38822 | FE_HAS_LOCK
status SCVYL | signal 0% | snr 0% | ber 0 | unc 38822 | FE_HAS_LOCK
status SCVYL | signal 0% | snr 0% | ber 0 | unc 38822 | FE_HAS_LOCK
This is with TV looking reasonably good, so these figures are not
plausible.
$ femon 10
FE: DRXK DVB-T (DVBT)
status SCVYL | signal 00de | snr 00f5 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK
status SCVYL | signal 00f0 | snr 00f5 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK
status SCVYL | signal 0117 | snr 00f6 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK
status SCVYL | signal 00b6 | snr 00eb | ber 00000000 | unc 000097a6 | FE_HAS_LOCK
status SCVYL | signal 00d1 | snr 00e7 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK
status SCVYL | signal 0073 | snr 00ea | ber 00000000 | unc 000097a6 | FE_HAS_LOCK
status SCVYL | signal 00a3 | snr 00ee | ber 00000000 | unc 000097a6 | FE_HAS_LOCK
status SCVYL | signal 00b5 | snr 00f4 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK
status SCVYL | signal 00ba | snr 00f3 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK
status SCVYL | signal 00be | snr 00f0 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK
Signal values are changing too much, snr is stable enough but way too
low, ber is apparently unimplemented, and unc is never reset AFAICS (it
started at 1 when the system started and has been only increasing since
then.) On my previous card, unc was an instant measurement, not a
cumulative value, not sure which is correct.
Yes I found that out aswell, but since image quality has always been
very fine, I haven't looked what this all should be.
I would like to see these statistics improved. I am willing to help,
however the drxk driver is rather complex (at least to my eyes) and I
do not have a datasheet so I wouldn't know where to start. Is there
anyone who can work on this and/or provide some guidance?
Thanks,
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