[mythtv-users] multiple transmitters - same channel

my thtv mythtv at cain.id.au
Wed Mar 19 03:08:22 UTC 2014

I have been using Mythtv for some years, however, recently here in 
Sydney Australia they have been retuning the digital (DVB) transmit 
frequencies.So I took the opportunity to re-scan my channels.However, I 
am in range of a number a transmitters and in some instances they are 
carrying the same services but signal strength and quality varies 
between them.

I allocated different channels for the different transmitters in order 
to compare the quality of my reception from each source.However, I 
believe myth is not tuning to each but defaulting to a particular 
transmitter, regardless of the channel selected.

So I had a look at some of the tables in mythconverg to try to determine 
why that may be.When checking channelscan_channel and 
channelscan_dtv_multiplex it appears that the latest scan correctly 
identify the same channel information with multiple entries for each 
frequency.I also checked dtv_multiplex, however, this table did not have 
all the available frequencies listed.It would seem that where 
transportid and networkid are identical for two different frequencies 
then only one of the frequencies is shown.

So my questions are;

Can mythtv show the same channel (2 channels with identical transportid, 
networkid and serviceid)but on different frequencies?

If not how can you choose which transmitter between multiples 
transmitting the same channels?


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