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.