Thanks to John and Jesper for the prompt reply. I tried that, and things looks a little different.
I do this on one screen and leave it running: tzap -a 0 -r "BBC ONE" using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0' reading channels from file '/root/.tzap/channels.conf' tuning to 505833330 Hz video pid 0x0258, audio pid 0x0259 status 0d | signal 3030 | snr dddd | ber 000064e9 | unc 0000000a | status 1f | signal 3030 | snr ebeb | ber 0000003e | unc 00000000 | FE_HAS_LOCK status 1f | signal 3030 | snr ebeb | ber 0000003f | unc 00000000 | FE_HAS_LOCK status 1f | signal 3030 | snr eaea | ber 0000003c | unc 00000000 | FE_HAS_LOCK status 1f | signal 3030 | snr e9e9 | ber 0000004a | unc 00000000 | FE_HAS_LOCK status 1f | signal 3030 | snr eaea | ber 00000048 | unc 00000000 | FE_HAS_LOCK