User manual DRAKE DIGITAL VMM860AG

[. . . ] DRAKE COMPANY determines is due to: (1) Improper maintenance or repair, including the installation of parts or accessories that do not conform to the quality and specifications of the original parts. (2) Misuse, abuse, neglect or improper installation. All implied warranties, if any, including warranties of merchantability and fitness for a particular purpose, terminate three (3) years from the date of the original purchase. DRAKE COMPANY'S entire obligation with respect to this product, and the original purchaser shall have no other remedy and no claim for incidental or consequential damages, losses or expenses. [. . . ] See also Item F5 which sets the type of channel (CATV or Broadcast TV) and sets the leading "1" for CATV channels 100 through 135. CAUTION: USE AN INSULATED SCREWDRIVER BLADE WHEN ADJUSTING THE AUDIO, VIDEO, A/V, OR RF ADJUSTMENTS. THIS WILL PREVENT THE POSSIBILITY OF SHORTING CIRCUITRY TO THE FRONT PANEL IN THE EVENT THAT THE SCREWDRIVER SLIPS OUT OF THE SLOT IN THE PLASTIC SHAFT OF THE POTENTIOMETER. F5 - Mode Switch Sets the type of channel, CATV or Broadcast TV ("BC TV"). The first position of the switch ("+100") sets a leading "1" for CATV channels 100 through 135. See also Item F4 for setting the channel number. For example: Setting for CATV channel "125"For example: Setting for CATV channel "25"- RF Frequency Range: 54 to 864 MHz; Standard, HRC, or IRC CATV channels 2 to 135, Broadcast TV channels 2 to 69. FCC Frequency Offsets: Automatic (+12. 5 kHz, +25 kHz, or none as required for each channel). Output level: +45 dBmV minimum (10 dB adjustment range). Output Impedance: 75 Ohms, 8 dB return loss. A/V Ratio: Audio carrier level, adjustable from -22 to -12 dB referenced to video carrier level. Frequency Stability: Within ±5 kHz Intercarrier Frequency: 4. 5 MHz Spurious Outputs (5 MHz to 1 GHz): -60 dBc, measured at -15 dB A/V ratio and with modulator output level of +45 dBmV. In-channel C/N: 65 dB typical, 4 MHz bandwidth. Broadband Noise: -78 dBc typicial, 4 MHz bandwidth @ +45 dBmV output. VIDEO Input Level for 87. 5% Modulation: 0. 65 Vp-p to 1. 5 Vp-p. Manual gain adjust with front panel control. Input Impedance: 75 Ohms, return loss of 26 dB minimum. Frequency Response: 20 Hz to 4. 2 MHz, ±1 dB. (standard), or FCC predistortion, (option). Differential Gain: 3% maximum (10 to 90% APL). Differential Phase: 30 maximum (10 to 90% APL). AUDIO Input Level for 25 kHz Peak Deviation: 125 mV rms to 2. 5 V rms. [. . . ] The output `RF' and `A/V (Ratio)' controls are used respectively to make these adjustments. RACK MOUNTING Adequate ventilation is very important in multi-channel installations. Therefore, new 12 position rack installations with multiple VMM860AG modulators (up to 12) must use the Drake PSM121 (or equivalent) high capacity power supply module. The power supply in the four position rack system can power up to four VMM860AG modulators or any mix of fixed and agile VMM models up to four total modulators. [. . . ]