Which of the following is characteristic of an inverting linear transponder?
Doppler shift is reduced because the uplink and downlink shifts are in opposite directions
Signal position in the band is reversed
Upper sideband on the uplink becomes lower sideband on the downlink, and vice versa
All these choices are correct✓پاسخ درست
توضیح
An inverting transponder mixes the whole uplink passband with a local oscillator and transmits the difference product, which turns the passband end for end: a signal near the bottom of the uplink comes out near the top of the downlink, and upper sideband becomes lower sideband. The same inversion makes the downlink Doppler shift move opposite to the uplink shift, so the two partly cancel, which is why every listed choice applies.