Yaesu FT-817 Operating Manual

Also see for FT-817 -: Brochure & specs Operating manual Technical supplement Manual Modification Instructions

77FT-817 Operating ManualSETUP OF MEMORIES FOR LOW EARTH ORBIT (LEO) FM SATELLITE OPERATIONAlthough the FT-817 is not capable of “full duplex” operation (simultaneous transmissionand reception), its flexible memory system is ideal for configuring a set of memories forLEO satellite work.The example at the right is designed aroundthe popular satellite UO-14, but the sameprinciples apply to operation using AO-27,SO-35, and other such satellites.First, set up a table of the required operat-ing frequencies. For UO-14, a typical setuptable is shown at the right:The above frequencies are nominal, and the changing frequencies reflects the Doppler Shiftwhich occurs on such satellites, which display rapid apparent motion relative to an earth-based observer. But if we can accommodate a set of several frequency pairs in our memorysystem, frequencies that reflect the frequency relationships encountered during a typicalpass, we will have a good chance of having our frequencies properly aligned when it is timefor making a QSO.So we need to store the above frequency matrix into memories. Note that the receivingfrequency and transmitting frequency are on different bands. Therefore, we will use the“Split Frequency Memory” storage technique described on page 43.First, press the key momentarily, then rotate the knob to select Operating FunctionRow 1 [A/B, A=B, SPL]. Press the (A/B) key, if necessary, to select VFOa.Now press the or key to select the 70 cm band. Check the settingof Menu #04 (AM&FM DL). and set this to “ENABLE” to allow smaller frequency incre-ments to be accommodated.Set the VFOa operating frequency to 435.080.00 MHz. Now press the (A/B) key inOperating Function Row 1 to select VFOb, and set VFOb to 145.970.00 MHz. Again pressthe (A/B) key to return to VFOa. Be sure that both VFOs are set to the FM mode, aswell.Press the key momentarily, and rotate the knob one click clockwise to selectOperating Function Row 2 [MW, MC, TAG].Press the (MW) key momentarily, then rotate the knob while the memory chan-nel number is blinking; select memory channel M-001, then press and hold in the (MW)key until you hear the double beep. We have just stored the first downlink (earth stationreceiving) frequency into memory.APPENDIXAOS = Acquisition of Signal (Beginning of Pass)LOS = Loss of Signal (End of Pass)CH #12345RX FREQ435.080 MHz435.075 MHz435.070 MHz435.065 MHz435.060 MHzTX FREQ145.9700 MHz145.9725 MHz145.9750 MHz145.9775 MHz145.9800 MHzNOTESAOSMid PassLOS