Zephyr 700 manual Front Panel Operation

700 Front Panel Operation

Refer to illustration in Section 1

The 700 is flexible, easy to operate, and provides you with the information needed to tell what's "going on."

The RELATIVE RF meter actually indicates the amount of limiting taking place in the CARRIER 1 IF/Demod section. The adjustment, directly beneath it, lets the meter be set to a convenient operating range for your particular signal. The meter is used for a peaking indicator while positioning the dish or polarizing the feedhorn. Once the installation is complete, set the meter to an easy-to-remember number. Any future deterioration of that setting provides a reason to check for system changes or problems. NOTE: The meter setting will probably change if a different SCPC carrier is tuned.

CARRIER 1 & CARRIER 2 meters indicate the audio output levels of each receiver. CARRIER 1 is always the active channel in single channel (mono) systems. Normal factory default setting of the meters is Zero dBm into 600 ohms at the balanced output for a reading of 100 (Zero VU). Output audio level is adjustable with the controls below each meter. An internal jumper at the very front of the audio demod circuit board permits an alternate Zero VU setting to indicate +8 dBm out. Custom zero settings can be set internally also. --See AUDIO OUTPUTS in Section 4, System Operation and Customization.

Audio squelch is activated by the presence of a high audio noise level. Whenever squelch occurs, a red LED illuminates the meter face. Audio muting from the squelch circuitry can be canceled by depressing the tops of the SQUELCH DEFEAT switches. -Although the squelch defeat disables the red meter lamps, the alarm relay action is not affected.

The DISPLAY is a backlit two-line LCD readout. The bottom line of text is for fault messages. The top line shows operating frequencies as follows:

TRANSPONDER: Center frequency of the satellite signal in MHz. C band transponder frequencies must be entered as a number between 3700 and 4200. Ku band (for the Americas) must be between 11700 and 12200.

CARRIER 1 & 2: Operating frequency of the individual SCPC carrier as down converted to the "70 MHz Band." Valid frequencies that may be entered are between

50.00and 90.00 MHz. Four digits must be entered whether needed or not. -For example, 81.3 MHz is entered as 8130 and is displayed as 8130.

Front Panel MA700FNT.SAM

SECTION 21