Drake MQM6000L Multiplexing QAM Modulator - Manual (Page 5)

5 General Description
General Description
the R.L. Drake model mqm6000L is a professional quality, digital headend transcoder that receives up to six
multiprogram transport streams via six bNC, ASi inputs. When six streams are input, the mqm6000L then
multiplexes one program from each input and applies the result to the qAm modulator and up converter for
output.
A program filter is provided to allow selection of the one desired program from each input. other programs in the
incoming streams are dropped.
the mqm6000L offers a +40 dbmv output upconverter with phase noise reduced to a level that is compatible
with qAm modes up through 1024qAm.
the mqm6000L can be used with the Drake Digital Headend Remote Control Software, version to be announced,
for setting up the program filtering, remote controlling, or remote monitoring of operating parameters. this
program can also be used to download new firmware into the unit if that ever becomes desirable. the mqm6000L
operates in a fixed output clock mode and processes null packets when required to maintain the set fixed clock
rate. PCR correction is included.
PROGRAM FILTERING
A 'Select Program' function is provided to allow the operator to select which mPeG program present on each of the
six input streams is to be included in the output multiplex.
OUTPUT
the Rf output is always qAm regardless of whether the input is vSb or qAm and the built-in agile upconverter
provides +40 dbmv output.