I've built TVHeadend on a Raspberry Pi3 (running Raspian Jessie), and downloaded what I understand to be the right firmware images as per the details on http://www.linuxtv.org/wiki/index.php/Geniatech_T230#Firmware
On running TVHeadend I see the device, and have added my local mux (Oxford, UK). I have a good aerial signal (tuning a TV with the cable reports a strong signal).
Unfortunately, attempting to scan for channels always fails. The log information reports:
2016-04-05 23:05:13.837 mpegts: 730.167MHz in Oxford - tuning on Silicon Labs Si2168 : DVB-T #0
2016-04-05 23:05:14.109 subscription: 0026: "scan" subscribing to mux "730.167MHz", weight: 6, adapter: "Silicon Labs Si2168 : DVB-T #0", network: "Oxford", service: "Raw PID Subscription"
2016-04-05 23:05:14.157 linuxdvb: Unable to provide signal strength value.
2016-04-05 23:05:14.157 linuxdvb: Unable to provide BER value.
2016-04-05 23:05:14.157 linuxdvb: Unable to provide SNR value.
2016-04-05 23:05:14.157 linuxdvb: Unable to provide UNC value.
2016-04-05 23:05:19.107 mpegts: 730.167MHz in Oxford - scan no data, failed
2016-04-05 23:05:19.107 subscription: 0026: "scan" unsubscribing
2016-04-05 23:05:19.108 mpegts: 785.833MHz in Oxford - tuning on Silicon Labs Si2168 : DVB-T #0
2016-04-05 23:05:19.111 subscription: 0028: "scan" subscribing to mux "785.833MHz", weight: 6, adapter: "Silicon Labs Si2168 : DVB-T #0", network: "Oxford", service: "Raw PID Subscription"
2016-04-05 23:05:24.107 mpegts: 785.833MHz in Oxford - scan no data, failed
2016-04-05 23:05:24.107 subscription: 0028: "scan" unsubscribing
2016-04-05 23:05:24.108 mpegts: 554MHz in Oxford - tuning on Silicon Labs Si2168 : DVB-T #0
2016-04-05 23:05:24.111 subscription: 002A: "scan" subscribing to mux "554MHz", weight: 6, adapter: "Silicon Labs Si2168 : DVB-T #0", network: "Oxford", service: "Raw PID Subscription"
2016-04-05 23:05:29.108 mpegts: 554MHz in Oxford - scan no data, failed
2016-04-05 23:05:29.108 subscription: 002A: "scan" unsubscribing
...
I'm unsure of how to proceed from here (I've added screenshots of the muxes, networks and TV adapters) and would greatly appreciate any help.
BTW The "auto" setting for character set on one mux was me experimenting with a suggested fix (it didn't work).