AES Corporation AC I nie 1 el 285 New bury Street 3 ยป Peabody, MA 01860-1315 USA SO SSR Phone 978-535-7310 Fax 978-535-7313 SERVICE MANUAL MODEL 7085-EWE Rev 1.
EXTERNAL CONNECTIONS 1-500 BNC SOCKET 29 WAY SD 7 TYPE PLUGGING) D-TYPE INTERCONNECTIONS PIN [FUNCTION | TYPE RANGE [DESCRIPTION 1501-1 [DATA IN |ANALOGUE [EXTERNAL MODULATION INPUT 1501-2 OUTDATED ANALOGUE SPIV-P RECEIVER AF OUTPUT 7501-3 [PTT INPUT OV/5V TRANSMIT ENABLE 1501-4 {GND GND ov GND 1501.5 B+ V+ +13.
Crystal Commemorated to pin'1 of IC6, determines the second local oscillator frequency. In this case the crystal has a frequency of 44.545MHz. The first IF signal is applied to the mixer and resultant frequency of 455KHz, is the difference between the IF signal and second local oscillator. The 455K Hz IF signal is output from pin 3 and is applied to a 455KHz band-pass filter, kHz channel spacing) or CF2 (12.5 kHz channel spacing).
Programming Mode The programming mode allows the user to retrieve or program TX/RX frequencies, SILO power Setting and channel spacing ,when pin 9 of JS01 is set to ground. Programming mode will Inhibit, Serial communications can then be made in order to read/program the onboard PROMOTE ( IC502 Which contains radio specific data. PROMOTE Relevant channel information, such as Rx/ Tx frequencies, is stored in the EEPROM(IC502) which is a 93C46.