Value '' not in allowed values

[K4KDR]

Unable to run either tianwen1_hsd.grc or tianwen1_hsd_shortframes.grc on Ubuntu 18.04, GNU Radio 3.8, Python 3.6.9; both show the following errors in the 'Symbol Sync' block:

Param - Filterbank Arms(nfilters):
	Value '' not in allowed values

Param - PFB MF Taps(pfb_mf_taps):
	Value '' not in allowed values

... have tried my best to locate this issue but without success. Any help appreciated!

[daniestevez]

Hi Scott,

I think that's a bug with the Symbol Sync block in GNU Radio 3.8.0. Could you please try GNU Radio 3.8.1?

A workaround is to modify the Symbol Sync block and use the Interpolating Resampler option set to MMSE, 8 tap FIR instead of Polyphase Filterbank, MF.

[K4KDR]

Great information - thank you!!

Would it be possible to obtain any of the I/Q files used to test these flowgraphs? Or, are they too large to share online?

[daniestevez]

Viljo ES5PC has shared some recordings of the low rate telemetry here. For the high speed data, it might be good to ask Paul M0EYT.