add DVB-C sample config

apps/modulator-c.conf

@@ -0,0 +1,58 @@
+[output]
+# connector = OFF, SMA or F
+connector = F
+# number of total channels to be used at the same time
+# use lower number to have fewer channels but stronger signal per channel
+channels = 16
+# unit of power in DBUV or DBM
+unit = DBUV
+# power output in units of above unit
+power = 70.0
+
+# define channels:
+# channels are frequency slots to which a stream (mod0, mod1 ...) can be assigned
+[channels]
+# frequency of channel 0, following channels are spaced according to set standard
+frequency = 474.0
+# numbers of channels to allocate, starting from frequency below
+# this defines 16 channels at 474, 474+8, 474+16, etc. Mhz
+channels = 16
+# standard: 0 = generic, 1 = DVB-T 8MHz, 2 = DVB-T 7 MHz, 3 = DVB-T 6 MHz 
+standard = DVBC_8
+
+[streams]
+# number of streams depends on the card hardware
+# streams correspond to devices mod0, mod1, ...
+# channels are defined above in channels section
+
+standard = DVBC_8
+stream_format = TS
+symbol_rate = 6.9
+modulation = qam_dvbc_256
+rolloff = 13
+
+channel = 0
+stream = 0
+
+channel = 1
+stream = 1
+
+channel = 2 
+stream = 2
+
+channel = 3
+stream = 3
+
+channel = 4
+stream = 4
+
+channel = 5
+stream = 5
+
+channel = 6
+stream = 6
+
+symbol_rate = 6.5
+modulation = qam_dvbc_64
+channel = 7
+stream = 7