V/u - VHF Uplink or transmit and UHF Downlink or receive.  Was known as Mode J.

V/a - UHF Uplink or transmit and 10 meter Downlink or receive.
Was known as Mode A.
AO-7 is in this mode alternating with U/v every other day.

Tracking

AOS - Acquisition of Signal.  Start of the satellite pass and when the satellite comes above the horizon.

TCA - Time of Closes Approach.  Middle of the pass at the highest elevation.

LOS - Loss of Signal.  End of the pass and when the satellite goes below the horizon.

Azimuth - Measured in degrees around your QTH.  Picture a 360 degree circle with 0 degrees being due north, 270 west, 180 south and 90 east.

Elevation - Measured in degrees above the horizon a satellite is from your QTH.  0 degrees would be at the horizon and 90 is directly overhead.

Tracking programs will show the Azimuth and Elevation of the satellite through out the pass so you know where to point your antenna. When working portable this is approximate and helps to track via signal strength rather than precise azimuth and elevation. 

Keplerian
Elements

Keplerian Elements or Keps as they are called are a set of numbers that indicate the orbit of the satellites.  These must be updated on a regular basis for our tracking programs to be correct. Elements should be updated weekly at a minimum.  Update methods very between tracking programs.

Amsat Keps Tutorial

Frequency

Doppler Shift - The change in frequency of due to the speed of the satellite.  VHF usually does not need adjusted if using the FM satellites but on SSB the shift is more apparent on VHF.  UHF on average is 10 khz higher at AOS than the satellites transmit frequency, on the transmit frequency at TCA and 10 khz lower at LOS. 

SSTV & Digital Amateur Radio Satellites

Continuing to investigate other satellites that are reportedly sending SSTV
occasionally.  These sats will send occasionally but transmit data most of the time.
I have yet to find a schedule for SSTV activity for these satellites other than the ones noted.

Here is a link to a SSTV Cubesat list from the Facebook Cubesat and ISS SSTV  page. Compiled by Rodger Johnston.  Posted with permission of the author.    This station is finding a lot of the cubesats silent over my station in the PNW of the US.
ARCTICSAT-1 (RS74S) UHF Downlink: 435.890 MHz SSTV Downlink in Robot 36 format - FM GMSK USP 2400 bd Data
UMKA-1 (RS40S) UHF Downlink: 437.625 MHz SSTV Downlink in Robot 36 format - FM GMSK USP 2400 bd Data Telescope images: S band - 2402 MHz Satellite was named after a popular short cartoon from 1969.
MONITOR-3 (RS58S) UHF Downlink: 435.290 MHz SSTV Downlink in Robot 36 format - FM GMSK USP 2400 bd Data SSTV Schedule: Beginning of transmission: January 04, 2025 at ~ 08:00 UTC. End of transmission: January 07, 2025 at ~ 18:00 UTC. Information can be found here.
UTMN-2 (RS27S) UHF Downlink: 436.125 MHz SSTV Downlink in Robot 36 format - FM GMSK USP 2400 bd Data SSTV Schedule: Beginning of transmission: January 04, 2025 at ~ 08:00 UTC. End of transmission: January 07, 2025 at ~ 18:00 UTC. Information can be found here.
VIZARD-METEO (RS38S) UHF Downlink: 437.825 MHz SSTV Downlink in Robot 72 format - FM
RUZAEVKA-390 (RS44S) UHF Downlink: 437.050 MHz SSTV Downlink in Robot 36 format - FM
SONATE-2 VHF Downlink: 145.880 MHz SSTV in Martin M1 format: 145.8800 MHz FM CW: 145.840 MHz GMSK9k6 - AX.25: 437.025 MHz APRS: 145.825 MHz
IO-117 (Greencube) UHF Uplink/Downlink: 435.310 MHz Programs Needed: Greencube Terminal                                Soundmodem Great video to show setup for Icom IC-9700. This station is still experimenting with the satellite.

FloripaSat-1 VBeacon: 145.900 MHz GFSK 1200 bps UHF Uplink/Downlink: 436.100 MHz GFSK 2400 bps Telemetry: 437.605 MHz 9600 bd Satellite has a UHF Digital up and downlink transponder See information here