Operating the Zephyrus 700 Series
SCPC Satellite Receiver
General information
The 700 receiver system is contained in a 3½" frame and features microcomputer electronics that control and monitor operation of either one or two receiver modules and the LNB. Primary power is normally 117 vac with 240 volt units available. Rack mounting is optional.
v Input signal to the receiver is L band at
v
vA "relative" RF signal meter monitors amplitude of the carrier at the demodulator of the first audio channel. The position of the meter needle may be changed with the adjustment directly below the meter. Any variation from this setting will then be due to a change in the strength of the received signal. Therefore, it may be used for peaking the dish and/or day to day monitoring of system stability, such as dish movement or cable problems.
vFrequencies of the C or Ku band satellite and the SCPC frequency are entered through a keypad.
transponder numbering system. They are displayed on the top line of the backlit alphanumeric readout. The bottom line of the readout gives the results of the
duties of the processor. The front panel of the 700 frame is sloped to make it easy to read the LCD display and enter data through the keypad.
vThe audio meters are backlit with LED's (low brightnes level is normal). Light is red if the channel is in a signal failure (squelch) mode and is green in normal or squelch defeat operation.
vSquelch of the output audio signal is provided by circuits that listen for high noise levels. The squelch may be defeated with front panel switches located next to the audio meters.
Standard receiver modules are for 15 or 7.5 kHz audio signals, with others available on special order. Baby boards on the receiver modules contain audio process/companding circuits for the particular system. Deemphasis time is selected with jumpers. Both balanced and unbalanced output connectors are provided on the rear panel.
A 70 MHz output is provided for use with external demodulators. Mode C contacts of a
General Information MA700OVW.sam
SECTION 11
