FO-29 status2014年10月26日 09時05分

Q1) In case of FO-29 (JAS-2):
    Does 145.900-146.000 mean that the uplink frequency is centered
    on 145.95 MHz and has a bandwidth of 100 kHz ?  Or does it mean
    that any uplink frequency between 145.9 to 146.0 MHz will work?

A1) Uplink: 145.900-146.000 mean that any uplink frequency between
    145.900 to 146.000 MHz. 
    And Downlink: 435.900-435.800 mean that 435.900 to 435.800 MHz.
    This is the characteristic of the equipment called Transponder.

    Why the increase or decrease in frequency is reversed, it's so
    
        Uplink + Downlink = Constant

    In case of FO-29: Uplink + Downlink = 581.800

    Namely, in SSB mode (Up: LSB, Down: USB),

        Uplink      Downlink
        145.900 --- 435.900
        145.901 --- 435.899
        145.902 --- 435.898
           :           :
        145.950 --- 435.850
           :           :
        145.998 --- 435.802
        145.999 --- 435.801
        146.000 --- 435.800

    We call this rule with "Linear Inverting Heterodyne Transponder".

Q2) In case of FO-29 (JAS-2): Uplink 145.85/87/89/91
    Does this mean that the satellite accepts uplink on 145.85
    AND 145.87, 145.89, 145.91 MHz?

A2) Yes, FO-29 had these four channel. If we uplinklink to FO-29
    in any four channel, it was downlink to 435.910 MHz.

    Unfortunately, this digital mode of FO-29 has become the state
    of inactive. It's currently active as SSB and CW mode.

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