I am somewhat new to satellites, but I have a question. I use a computer program to help with Doppler shift and to manage satellite memories. On AO-7 and VO-52 I have the following set as the middle of the pass band. This is what I set into the radio VFO. I have noticed that I have to adjust the transmitter frequency. I thought that the TX and RX would track each other?

Does the relationship between TX and RX frequencies on the satellite change?

If I am setting the wrong base frequency into my VFO's for these two satellites, what are better frequencies to use?

Thanks

Satellite

Lower

Upper

middle

VO-52A

UPLINK

435.2200

435.2800

435.2500

DOWNLINK

145.8700

145.9300

145.9000

VO-52B

UPLINK

435.2250

435.2750

435.2500

DOWNLINK

145.9250

145.8750

145.9000

AO-7 A

UPLINK

145.8500

145.9500

145.9000

DOWNLINK

29.4000

29.5000

29.4500

AO-7 B

UPLINK

432.1250

432.1750

432.1500

DOWNLINK

145.9750

145.9250

145.9500

Mike McConnell, Ph.D.

W0PD

1518 Willson Ave.

Webster City, IA 50595

515-835-9363