User manual DRAKE DIGITAL TMQAMASI

[. . . ] This will provide a modulated output without any external input source. A CW output mode is selectable to allow measurement of the output level with an analog signal meter. This IF output can be connected to one of the DRAKE DUC series of digital upconverters to provide an output on a CATV or broadcast channel. F1 - LCD Display Displays the modulator parameter and its setting. ENTER F3 - Left and Right Button Use the Left and Right buttons to select the parameter you desire to view or adjust. F4 Up and Down Buttons Use the Up and Down buttons to adjust a parameter value when in the adjust mode. [. . . ] After viewing, the display will time-out and return to the output baud (BD) rate/symbol rate page. FROM SATELLITE DEMODULATOR OR OTHER LVDS DATA STREAM 2) To ADJUST or change parameter settings or for initial set up, follow these steps: Press and hold the enter button for 2 to 3 seconds until the display begins to flash. Press the left or right arrow button to scroll to the desired parameter. Note that no change is made at this point until the new value is loaded and saved. When the value is adjusted to the value required, press the enter button again. This will load and save the new value until this procedure is repeated. 5 CHART OF DISPLAY MENUS The following information may serve as an aid in setting up the TMQAM parameters. Normally, the EXTERNAL selection would be used to select the MPEG2 transport stream input. The PRBS selections provide test sequences generated inside the TMQAM and are for testing the modulator without a MPEG2 input source. Continue this process until all parameters have been checked and/or adjusted. The ENTER button can be used after each parameter adjustment or, if desired, wait until all parameter adjustments are set and then "ENTER" adjustments all at once. The INPUT menu is used to select an inverted clock if this is required. The CW setting is for testing and should be selected to allow setting of the upconverter output level using a device such as a signal level meter or spectrum analyzer. If the output upconverter uses high side local oscillator injection and inverts the output spectrum of the TMQAM (the Drake DUC upconverters do this), select the MOD-INV setting to provide a normal output from the upconverter. If the upconverter does not invert the spectrum or if you are use the 44 MHz IF output directly, you may need to select the MOD-NORM setting. SETUP PROCEDURES 6 The following chart shows all choices that are available for each parameter. Most CATV systems are using 64QAM or 256QAM for digital video. The ALPHA menu displays the roll-off setting for the baseband filtering. If the demodulating device must have a particular set of values, then select the appropriate matching setting. If AUTO is selected, the output baud or symbol rate will automatically track that of the input stream. If FIXED is selected, the output rate will remain fixed at this setting and the TMQAM will add null packets where required if the input rate is slower. If the input rate exceeds the fixed manual setting, an error will result. Some set top boxes are designed to operate at only one fixed symbol rate. If this is the case for your installation, use FIXED setting and set the value in the next menu to match that of the set top box. If a fixed setting is required, use the BD RATE page to make the selection. The BD RATE menu displays the current output symbol rate or baud rate. [. . . ] Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusions or limitation of incidental or consequential damages, so the above limitation and exclusion may not apply to you. This warranty gives you specific legal rights and you may also have other rights which vary from state to state. This warranty shall be construed under the laws of Ohio. The TMQAM and TMQAMasi modulator can operate in either of two clock modes: 1) It can automatically lock to the incoming bit rates producing an output rate determined by the input stream. Power should be supplied by the model PS8 power supply module which also mounts into the DRMM12. [. . . ]