Frustrating to say the least........
Deleting hts/.hts/tvheadend was not drastic at all. just need to stop and start the service to reset user password.
sudo service tvheadend stop
sudo dpkg-reconfigure tvheadend
sudo service tvheadend start
The system seems to configured properly. All three tuners are displayed Under "Configuration -> DVB Inputs-> Tv Adapaters" and each tuner is has its own Device Path. /dev/dvb/adapter[0,1,2]
They are also registered in syslog without errors.
Mar 17 17:28:04 plextwo kernel: [ 14.812185] hdhomerun: userhdhomerun connected
Mar 17 17:28:04 plextwo kernel: [ 14.812194] hdhomerun: creating dvb device for 131257B7-0
Mar 17 17:28:04 plextwo kernel: [ 14.812270] DVB: registering new adapter (HDHomeRun)
Mar 17 17:28:04 plextwo kernel: [ 14.846483] DVB: registering adapter 0 frontend 0 (HDHomeRun ATSC)...
Mar 17 17:28:04 plextwo kernel: [ 14.846846] HDHomeRun0: DVB Frontend registered
Mar 17 17:28:04 plextwo kernel: [ 14.846850] HDHomeRun0: Registered DVB adapter0
Mar 17 17:28:04 plextwo kernel: [ 14.847385] hdhomerun: device /dev/hdhomerun_data0 created
Mar 17 17:28:04 plextwo kernel: [ 14.847506] hdhomerun: userhdhomerun connected
Mar 17 17:28:04 plextwo kernel: [ 14.847513] hdhomerun: creating dvb device for 131257B7-1
Mar 17 17:28:04 plextwo kernel: [ 14.847562] DVB: registering new adapter (HDHomeRun)
Mar 17 17:28:04 plextwo kernel: [ 14.848623] DVB: registering adapter 1 frontend 0 (HDHomeRun ATSC)...
Mar 17 17:28:04 plextwo kernel: [ 14.848668] HDHomeRun1: DVB Frontend registered
Mar 17 17:28:04 plextwo kernel: [ 14.848671] HDHomeRun1: Registered DVB adapter1
Mar 17 17:28:04 plextwo kernel: [ 14.848710] hdhomerun: device /dev/hdhomerun_data1 created
Mar 17 17:28:04 plextwo kernel: [ 14.848790] hdhomerun: userhdhomerun connected
Mar 17 17:28:04 plextwo kernel: [ 14.848795] hdhomerun: creating dvb device for 131257B7-2
Mar 17 17:28:04 plextwo kernel: [ 14.848853] DVB: registering new adapter (HDHomeRun)
Mar 17 17:28:04 plextwo kernel: [ 14.849086] DVB: registering adapter 2 frontend 0 (HDHomeRun ATSC)...
Mar 17 17:28:04 plextwo kernel: [ 14.849128] HDHomeRun2: DVB Frontend registered
Mar 17 17:28:04 plextwo kernel: [ 14.849131] HDHomeRun2: Registered DVB adapter2
Mar 17 17:28:04 plextwo kernel: [ 14.849170] hdhomerun: device /dev/hdhomerun_data2 created
Mar 17 17:28:04 plextwo kernel: [ 14.849908] hdhomerun: userhdhomerun connected
Now which DVB network should be selected.
us-ATSC_center_frequencies - gave me the follwing but no channels were available
Mar 17 10:41:32 plextwo kernel: [ 2664.560671] hdhomerun: allocated buffer of 375060 bytes for device 1
Mar 17 10:41:33 plextwo kernel: [ 2665.603749] hdhomerun: allocated buffer of 440860 bytes for device 1
with the following
Mar 17 12:11:34 plextwo tvheadend[965]: subscription: No transponder available for subscription "127.0.0.1 [ xbmc | XBMC Media Center ]" to channel "100"
Mar 17 12:11:39 plextwo tvheadend[965]: subscription: "127.0.0.1 [ xbmc | XBMC Media Center ]" unsubscribing from "100"
atsc_us_Cable_Standard_center_frequencies_QAM256 AND"atsc_us_Cable_EIA_542_HRC_center_frequencies_QAM256" gave me this
Mar 17 15:19:20 plextwo kernel: [ 9550.633559] DVB (dvb_dmxdev_filter_start): could not alloc feed
Mar 17 15:19:32 plextwo kernel: [ 9562.620084] DVB (dvb_dmxdev_filter_start): could not alloc feed
and the "Map DVB Serices to channels" button never became active
Thanks for assistance.