Passband

Transponder Passband

When I tried to make my first QSO via a Satellite that uses a Linear Transponder, I got lost therefore I made the following table so that I had an idea on which frequency to transmit and what to listen on.

Linear

When a linear passband is used, the uplink and downlink frequenties are both going up and down. Example uplink 145.850 downlink 29.400; uplink 145.855 downlink 29.405; uplink 145.860 downlink 29.410. As you can see, when uplink frequentie goes up, downlink frequenties also goes up.

non Linear

When you use a non Linear passband, the downlink goes down in frequentie when the uplink frequentie goes up. Example uplink 432.125 downlink 145.975; uplink 432.130 downlink 145.970; uplink 432.135 downlink 145.965.

Inverting

When there is a remark: “inverting” this means that uplink and dowlink modulation aren’t the same. For example: when uplink is LSB, then the downlink will be USB.

Passband AO-7

Transponder Passband – AO-7 (Linear Non Inverting) Mode-A
Uplink Downlink
Mode
Frequency
 Mode
Frequency
USB 145.850 USB 29.400
USB 145.855 USB 29.405
USB 145.860 USB 29.410
USB 145.865 USB 29.415
USB 145.870 USB 29.420
USB 145.875 USB 29.425
USB 145.880 USB 29.430
USB 145.885 USB 29.435
USB 145.890 USB 29.440
USB 145.895 USB 29.445
USB 145.900 USB 29.450
USB 145.905 USB 29.455
USB 145.910 USB 29.460
USB 145.915 USB 29.465
USB 145.920 USB 29.470
USB 145.925 USB 29.475
USB 145.930 USB 29.480
USB 145.935 USB 29.485
USB 145.940 USB 29.490
USB 145.945 USB 29.495
USB 145.950 USB 29.500

 

Transponder Passband – AO-7 (non Linear Inverting Transponder) Mode-B
Uplink Downlink
Mode
Frequency
 Mode
Frequency
LSB 432.125 USB 145.975
LSB 432.130 USB 145.970
LSB 432.135 USB 145.965
LSB 432.140 USB 145.960
LSB 432.145 USB 145.955
LSB 432.150 USB 145.950
LSB 432.155 USB 145.945
LSB 432.160 USB 145.940
LSB 432.165 USB 145.935
LSB 432.170 USB 145.930
LSB 432.175 USB 145.925

 

Passband DO-64

Transponder Passband – DO-64 (Inverting Dutch Transponder)
Uplink Downlink
Mode
Frequency
 Mode
Frequency
LSB 435.570 USB 145.880
LSB 435.565 USB 145.885
LSB 435.560 USB 145.890
LSB 435.555 USB 145.895
LSB 435.550 USB 145.900
LSB 435.545 USB 145.905
LSB 435.540 USB 145.910
LSB 435.535 USB 145.915
LSB 435.530 USB 145.920

 

Passband FO-29

Transponder Passband – FO-29 (non Linear Inverting Transponder)
Uplink Downlink
Mode
Frequency
 Mode
Frequency
LSB 146.000 USB 435.800
LSB 145.995 USB 435.805
LSB 145.990 USB 435.810
LSB 145.985 USB 435.815
LSB 145.980 USB 435.820
LSB 145.975 USB 435.825
LSB 145.970 USB 435.830
LSB 145.965 USB 435.835
LSB 145.960 USB 435.840
LSB 145.955 USB 435.845
LSB 145.950 USB 435.850
LSB 145.945 USB 435.855
LSB 145.940 USB 435.860
LSB 145.935 USB 435.865
LSB 145.930 USB 435.870
LSB 145.925 USB 435.875
LSB 145.920 USB 435.880
LSB 145.915 USB 435.885
LSB 145.910 USB 435.890
LSB 145.905 USB 435.895
LSB 145.900 USB 435.900

 

Passband HO-68

Transponder Passband – HO-68 ( Liniear inverting Transponder )
Uplink Downlink
Mode
Frequency
 Mode
Frequency
LSB 145.925 USB 435.765
LSB 145.935 USB 435.755
LSB 145.945 USB 435.745
LSB 145.955 USB 435.735
LSB 145.965 USB 435.725
LSB 145.975 USB 435.715

Passband VO-52 (Dutch)

Transponder Passband – VO-52 (non Linear Inverting Transponder)
Uplink Downlink
Mode
Frequency
 Mode
Frequency
LSB 435.225 USB 145.925
LSB 435.230 USB 145.920
LSB 435.235 USB 145.915
LSB 435.240 USB 145.910
LSB 435.245 USB 145.905
LSB 435.250 USB 145.900
LSB 435.255 USB 145.895
LSB 435.260 USB 145.890
LSB 435.265 USB 145.885
LSB 435.270 USB 145.880
LSB 435.275 USB 145.875

Passband VO-52 (Indian)

Transponder Passband – VO-52 (Linear Inverting Transponder)
Uplink Downlink
Mode Frequency Mode
Frequency
LSB 435.220 USB 145.870
LSB 435.225 USB 145.875
LSB 435.230 USB 145.880
LSB 435.235 USB 145.885
LSB 435.240 USB 145.890
LSB 435.245 USB 145.895
LSB 435.250 USB 145.900
LSB 435.255 USB 145.905
LSB 435.260 USB 145.910
LSB 435.265 USB 145.915
LSB 435.270 USB 145.920
LSB 435.275 USB 145.925
LSB 435.280 USB 145.930